CASE CX55B Mini Excavator Service Repair Manual.pdf

SERVICE
MANUAL
1/1 SERVICE MANUAL
CX45B Series 2
CX50B Series 2
CX55B
Mini Excavator
Part number 47574282B
English
March 2014
Copyright © 2014 CNH Industrial Italia S.p.A. All Rights Reserved.
CX45B Series 2
CX50B Series 2
CX55B
Mini Excavator
Part number 47574282B

SERVICE MANUAL
CX45B
CX50B
CX55B
47574282B 24/03/2014
EN

Contents
INTRODUCTION
Engine....................................................................................... 10
[10.001] Engine and crankcase ............................................................. 10.1
[10.102] Pan and covers .................................................................... 10.2
[10.106] Valve drive and gears .............................................................. 10.3
[10.101] Cylinder heads ..................................................................... 10.4
[10.105] Connecting rods and pistons....................................................... 10.5
[10.103] Crankshaft and flywheel............................................................ 10.6
[10.216] Fuel tanks .......................................................................... 10.7
[10.218] Fuel injection system............................................................... 10.8
[10.202] Air cleaners and lines .............................................................. 10.9
[10.250] Turbocharger and lines........................................................... 10.10
[10.254] Intake and exhaust manifolds and muffler ....................................... 10.11
[10.400] Engine cooling system ........................................................... 10.12
[10.304] Engine lubrication system........................................................ 10.13
Hydraulic systems....................................................................... 35
[35.000] Hydraulic systems.................................................................. 35.1
[35.300] Reservoir, cooler, and filters........................................................ 35.2
[35.106] Variable displacement pump ....................................................... 35.3
[35.359] Main control valve.................................................................. 35.4
[35.355] Hydraulic hand control ............................................................. 35.5
[35.356] Hydraulic foot control............................................................... 35.6
[35.352] Hydraulic swing system ............................................................ 35.7
[35.353] Hydraulic travel system ............................................................ 35.8
[35.354] Hydraulic central joint .............................................................. 35.9
[35.736] Boom hydraulic system .......................................................... 35.10
[35.737] Dipper hydraulic system.......................................................... 35.11
47574282B 24/03/2014

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[35.738] Excavator and backhoe bucket hydraulic system................................ 35.12
[35.360] Hammer and rotating bucket hydraulic system .................................. 35.13
[35.739] Swing arm hydraulic system ..................................................... 35.14
[35.741] Dozer blade cylinders ............................................................ 35.15
Frames and ballasting ................................................................. 39
[39.101] Upper frame........................................................................ 39.1
[39.103] Swing ring assembly ............................................................... 39.2
[39.140] Ballasts and supports .............................................................. 39.3
Tracks and track suspension........................................................ 48
[48.130] Track frame and driving wheels .................................................... 48.1
[48.100] Tracks .............................................................................. 48.2
[48.134] Track tension units ................................................................. 48.3
[48.138] Track rollers ........................................................................ 48.4
Cab climate control ..................................................................... 50
[50.200] Air conditioning..................................................................... 50.1
Electrical systems....................................................................... 55
[55.000] Electrical system ................................................................... 55.1
[55.100] Harnesses and connectors......................................................... 55.2
[55.015] Engine control system.............................................................. 55.3
[55.201] Engine starting system ............................................................. 55.4
[55.301] Alternator........................................................................... 55.5
[55.302] Battery.............................................................................. 55.6
[55.011] Fuel tank system ................................................................... 55.7
[55.013] Engine oil system .................................................................. 55.8
[55.512] Cab controls........................................................................ 55.9
[55.404] External lighting .................................................................. 55.10
[55.510] Cab or platform harnesses and connectors...................................... 55.11
Booms, dippers, and buckets ....................................................... 84
47574282B 24/03/2014

[84.114] Boom pivoting support ............................................................. 84.1
[84.910] Boom ............................................................................... 84.2
[84.912] Dipper arm ......................................................................... 84.3
[84.100] Bucket.............................................................................. 84.4
Dozer blade and arm................................................................... 86
[86.110] Dozer blade ........................................................................ 86.1
Platform, cab, bodywork, and decals............................................. 90
[90.150] Cab................................................................................. 90.1
[90.110] Operator platform less cab ......................................................... 90.2
[90.114] Operator protections ............................................................... 90.3
[90.105] Machine shields and guards ....................................................... 90.4
[90.116] Fenders and guards................................................................ 90.5
47574282B 24/03/2014

INTRODUCTION
47574282B 24/03/2014
1

INTRODUCTION
Foreword - Important notice regarding equipment servicing
All repair and maintenance work listed in this manual must be carried out only by qualified dealership personnel,
strictly complying with the instructions given, and using, whenever possible, the special tools.
Anyone who performs repair and maintenance operations without complying with the procedures provided herein
shall be responsible for any subsequent damages.
The manufacturer and all the organizations of its distribution chain, including - without limitation - national, regional, or
local dealers, reject any responsibility for damages caused by parts and/or components not approved by the manu-
facturer, including those used for the servicing or repair of the product manufactured or marketed by the manufacturer.
In any case, no warranty is given or attributed on the product manufactured or marketed by the manufacturer in case
of damages caused by parts and/or components not approved by the manufacturer.
The information in this manual is up-to-date at the date of the publication. It is the policy of the manufacturer for
continuous improvement. Some information could not be updated due to modifications of a technical or commercial
type, or changes to the laws and regulations of different countries.
In case of questions, refer to your CASE CONSTRUCTION Sales and Service Networks.
47574282B 24/03/2014
3

INTRODUCTION
Safety rules
Personal safety
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all
safety messages that follow this symbol to avoid possible death or injury.
Throughout this manual you will find the signal words DANGER, WARNING, and CAUTION followed by special in-
structions. These precautions are intended for the personal safety of you and those working with you.
Read and understand all the safety messages in this manual before you operate or service the machine.
DANGER indicates a hazardous situation that, if not avoided, will result in death or serious injury.
WARNING indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
FAILURE TO FOLLOW DANGER, WARNING, AND CAUTION MESSAGES COULD RESULT
IN DEATH OR SERIOUS INJURY.
Machine safety
NOTICE: Notice indicates a situation that, if not avoided, could result in machine or property damage.
Throughout this manual you will find the signal word Notice followed by special instructions to prevent machine or
property damage. The word Notice is used to address practices not related to personal safety.
Information
NOTE: Note indicates additional information that clarifies steps, procedures, or other information in this manual.
Throughout this manual you will find the word Note followed by additional information about a step, procedure, or
other information in the manual. The word Note is not intended to address personal safety or property damage.
47574282B 24/03/2014
4

INTRODUCTION
Personal safety
NOTICE: The proper and safe lubrication and maintenance for this machine, recommended by Manufacturer, are
outlined in the OPERATOR’S MANUAL for the machine.
Improper performance of lubrication or maintenance procedures are dangerous and could result in injury or death.
Read and understand the MANUAL before performing any lubrication or maintenance.
The serviceman or mechanic may be unfamiliar with many of the systems on this machine. This makes a careful
use of the systems very important when performing maintenance operations. Sound knowledge of the system and or
components is important before the removal or disassembly of any component.
Because of the size of some of the machine components, the serviceman or mechanic should check the weights
noted in this manual. Use proper lifting procedures when removing any components. Weight of components table is
shown in this section.
The following is a list of basic precautions that must always be observed.
1. Read and understand all Warning plates and decals on the machine before Operating, Maintaining or Repairing
this machine.
2. Always wear protective glasses and protective shoes when working around machines. In particular, wear protec-
tive glasses when using hammers, punches or drifts on any part of the machine or attachments. Use welders
gloves, hood/goggles, apron and the protective clothing appropriate to the welding job being performed. Do not
wear loose fitting or torn clothing. Remove all rings from fingers, loose jewellery, confine long hair and loose cloth-
ing before working on this machinery.
3. Disconnect the battery and hang a “Maintenance in Progress” tag in the operator’s seat. Remove starter key.
4. If possible, make all repairs with the machine parked on a level and firm surface. Block the machine so it does not
roll while working on or under the machine. Hang a “Maintenance in Progress” tag in the operator’s seat.
5. Do not work on any machine that is supported only by lift, jacks or a hoist. Always use blocks or stops for the jack
before carrying out any disassembly operation.
NOTICE: Do not operate this machine unless you have read and understood all instructions contained in this manual.
Improper machine operation is dangerous and could result in injury or death.
6. Relieve all pressure in air, oil or water systems before any lines, fittings or related items are disconnected or
removed. Always make sure all raised components are blocked correctly and be alert for possible pressure
when disconnecting any device from a system under pressure.
7. Lower the bucket, dozer or other attachments to the ground before performing any work on the machine. If this
cannot be done, make sure the bucket, blade or other attachment is blocked correctly to prevent it from dropping
unexpectedly.
8. Use steps and grab handles when mounting or dismounting a machine. Remove any debris or mud from steps,
walkways or work platforms before using them. Always face the machine when using steps, ladders and walk-
ways. When it is not possible to use the designed access system, provide ladders, scaffolds, or work, platforms
to perform safe repair operations.
9. To avoid back injury, use a hoist when lifting components which weigh 20 kg (44.09 lb) or more. Make sure all
chains, hooks, slings, etc., are in good condition and are the correct capacity. Be sure hooks are positioned
correctly. Lifting eyes are not to be side loaded during a lifting operation.
10. To avoid burns, be alert for hot parts and surfaces immediately after stopping the machine such as hot fluids in
lines, tubes and compartment covers.
11. Be careful when removing cover plates. Gradually back off the last two capscrews or nuts located at opposite
ends of the cover or device and carefully pry the cover loose to relieve any spring or other pressure, before
removing the last two capscrews or nuts completely.
12. Be careful when removing filler caps, breathers and plugs on the machine. Hold a rag over the cap or plug to
prevent being sprayed or splashed by liquids under pressure. Danger is even greater if the machine has just
been stopped, as liquids might be boiling hot.
13. Always use the proper tools that are in good condition and that are suited for the job at hand. Be sure you
understand how to use them before performing any service work.
14. Reinstall all clamps with the same spare part number. Do not use clamps of inferior quality if replacement is
necessary.
47574282B 24/03/2014
5

INTRODUCTION
15. Repairs which require welding should be performed only with the benefit of the appropriate reference informa-
tion and by personnel adequately trained and skilled in welding procedures. Determine the type of metal being
welded and select the correct welding procedure and electrodes, rods or wires to provide a metal weld strength
at least equivalent to that of the parent metal. Make sure to disconnect the battery before any welding operation
is performed.
16. Do not damage wiring during removal operations. Reinstall the wiring so it is not damaged nor will be damaged
in operation of the machine by contacting sharp corners, or by rubbing against some object or hot surface. Do
not connect wiring to a line containing fluid.
17. Be sure all protective devices, including guards and shields, are properly installed and functioning correctly before
starting a repair. If a guard or shield must be removed to perform the repair work, use extra caution and replace
the guard or shield after repair is complete.
18. Performing maintenance and repair operations while the bucket is lifted is dangerous, because there is the pos-
sibility of a device falling. Do not fail to lower such device and place the bucket to the ground before starting the
operation.
19. Loose or dirty fuel, lubrication and hydraulic systems, pipes and hoses may cause fires. Do not bend or strike
high-pressure lines, do not install bent or damaged lines. Inspect lines, tubes and hoses carefully. Do not check
for leaks with your hands. Very small (pinhole) leaks can result in a high velocity oil jet that will be invisible close
to the hose.
This oil can penetrate the skin and cause personal injury. Use card-board or paper to locate pinhole leaks.
20. Tighten connections to the correct torque. Make sure that all protections against burns, the clamps and the oper-
ator’s protective devices are correctly installed in order to prevent excessive heat, vibrations or rubbing against
other parts during operation. Shields that protect against oil spray onto hot exhaust components in event of a
line, tube or seal failure must be installed correctly.
21. Do not operate a machine if any rotating part is damaged or contacts any other part during operation. Any high
speed rotating component that has been damaged or altered should be checked for balance before reusing.
22. Be careful when servicing or separating the tracks. Chips can fly when removing or installing a track pin. Wear
safety glasses and long sleeve protective clothing. Tracks can unroll very quickly when separated. Keep away
from front and rear of machine. The machine can move unexpectedly when both tracks (crawlers) are disengaged
from the sprockets. Block the machine to prevent it from moving.
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INTRODUCTION
Part identification
TULI12EXN8006GB 1
1. Engine 14. Safety lever 27. Rubber crawler
2. Oil filter 15. Canopy 28. Dozer
3. Radiator 16. Operating lever 29. Dozer cylinder
4. Reservoir tank 17. Dozer control lever 30. Boom
5. Air cleaner 18. Throttle lever 31. Boom cylinder
6. Muffler 19. Gauge cluster 32. Arm cylinder
7. Fuel tank 20. Battery 33. Light
8. Hydraulic oil tank 21. Swivel joint 34. Arm
9. Hydraulic pumps 22. Travel motor 35. Rod and idler link
10. Slewing motor 23. Slewing ring 36. Bucket cylinder
11. Swing cylinder 24. Idler adjuster 37. Bucket
12. Control valve 25. Lower roller
13. Travel lever 26. Upper roller
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29

SERVICE MANUAL
Engine
CX45B
CX50B
CX55B
47574282B 24/03/2014
10

Engine - Engine and crankcase
Engine - External view
1. Filler port (engine oil)
2. Turbocharger
3. Air intake port (from air cleaner, optional)
4. Lifting eye
5. Coolant pump
6. Fan
7. Crankshaft V-pulley
8. V-belt
9. Filler port (engine oil)
10. Drain plug (engine oil)
11. Engine oil cooler (4TNV98T, 4TNV106 and
4TNV106T)
12. Engine oil filter
13. Dipstick (engine oil)
14. Fuel injection pump
15. Governor lever
16. Fuel filter
17. Fuel cock
18. Fuel filter mounting
19. Lifting eye
20. Engine name plate
21. Rocker arm cover
22. Flywheel
23. Starter motor
24. Exhaust manifold
25. Generator
NOTE: This illustration shows the 4TNV98T engine (with
turbocharger).
The drain plug (engine oil) location depends on the engine
installed on the machine unit to be on the fuel injection
pump side (above illustration) or starter motor side.
TULI12EXN4782CA 1
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Engine - Static description
1. Emission reduction
New fuel injection pressure
• Mono plunger
• Higher injection pressure
• Injection timing, speed timer, load timer, cold start timer
control
2. Noise reduction
Higher stiffness cylinder block
Higher stiffness gear-case
Injection nozzle
• Low suck volume
• Multi injection holes
Cylinder head
• Optimal nozzle angle
• Optimal swirl ratio
• Optional valve timing
Piston
• New combustion chamber
Noise reduction
New lube oil pan
• Change rotor shape for low pulsation
• Driven by crankshaft directly
Cylinder head
• 4 valve/cylinder (intake-2, exhaust-2)
• Optimal installation of the injection nozzle vertical in-
stallation and location of the centre of cylinder
• Optimal valve timing
TULI12EXN4783CB 1
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New fuel injection nozzle
• Low suck volume
• Multi injection holes
New fuel injection pump
• Mono plunger
• Higher injection pressure
• Mechanical control of injection timing, speed timer, load
timer, cold start timer
Piston
• New combustion chamber
Noise reduction (only applied for 4TNV84T)
New lube oil pan
• Change rotor shape for low pulsation
• Driven by crankshaft directly
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Engine - Service instruction
Periodic maintenance schedule
The engine periodic inspection timing is hard to determine
as it varies with the application, load status, qualities of the
fuel and lubricating oils used and handling status. General
rules are described here.
: User-maintenance
: Parts replacement
: Shop-inspection
Maintenance period
Classifica-
tion
Piece Daily Every
50 h
Every
250 h
or 3
months
Every 500 h or 6 months
Inspec-
tion
every
1000 h
or one
year
Every
2000 h
or two
years
Whole
Visual check around
the machine
Fuel tank level check
and fuel supply
Fuel tank drain
Water separator
(Option) draining
Fuel system bleeding
Water separator
cleaning
Fuel system
Fuel filter element
replacement
Lube oil level check
and replenishment
Lube oil replacement
Lubricating
oil system
Lube oil filter
replacement
1st time
2nd time
and
there-
after
Coolant level check
and replenishment
Radiator fin cleaning
V-belt tension check
1st time
2nd time
and
there-
after
Coolant change
Coolant
pump
Coolant/water
path flushing and
maintenance
Rubber hose
Fuel pipe and coolant
pipe inspection and
maintenance
Injection
governor
Inspection and
adjustment of
governor lever and
accelerator
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Maintenance period
Classifica-
tion
Piece Daily Every
50 h
Every
250 h
or 3
months
Every 500 h or 6 months
Inspec-
tion
every
1000 h
or one
year
Every
2000 h
or two
years
Air cleaner cleaning
and element
replacement
Diaphragm assy
inspection
(2
years)
Air intake
system
Turbocharger blower
cleaning*
Warning lamp and
instruments function
check
Electrical
system Battery electrolyte
level check and
battery recharging
Intake/exhaust valve
head clearance
adjustment
Cylinder
head
Intake/exhaust valve
seat lapping
Fuel injection nozzle
pressure inspection
Fuel injection
pump and
nozzle
Fuel injection timing
adjustment
Fuel injection pump
inspection and
adjustment
*EPA allows servicing the emission related parts every
1500 - 3000 h
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10.1 [10.001] / 32

Engine - Inspect - Daily Inspection
Be sure to check the following points before starting an
engine every day:
No. Inspection item
1. Visual check around the machine
2. Fuel tank level check and fuel supply
3. Lube oil level check and replenishment
4. Coolant level check and replenishment
5. Fuel pipe and coolant pipe inspection and maintenance
6. Inspection and adjustment of governor lever and accelerator
7. Warning lamp and instruments function check
8. Water separator draining
Visual check around the machine
If any problem is found, do not use before the engine re-
pairs have been completed.
• Oil leak from the lubrication system
• Fuel leak from the fuel system
• Coolant leak from the water cooling system
• Damaged parts
• Loosened or lost screws
• Fuel, radiator rubber hoses, cracked V-belt, loos-
ened clamp
Fuel tank level check and fuel supply
Check the remaining fuel oil level in the fuel tank and refuel
the recommended fuel if necessary.
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Lube oil level check and replenishment
(a) Checking oil level
Check the lubricating oil level with the dipstick (A), after
adjusting the position of the machine so that the engine is
horizontal. Insert the dipstick fully and check the oil level.
The oil shall not be contaminated heavily and have appro-
priate viscosity.
No coolant water or diesel fuel shall be mixed.
When lube oil is supplied after the engine has been run-
ning, check the lube oil level after about 10 min after the
engine shutdown so that the lube oil has filled the oil pan.
TULI12EXN4788BB 1
The level shall be between the upper (AU) and lower (AL)
limit lines on the dipstick (A).
Model Total volume Effective volume
3TNV82A 5.5 l (1.45 US gal) 1.9 l (0.50 US gal)
3TNV84(T) 88 6.7 l (1.77 US gal) 2.8 l (0.74 US gal)
4TNV84(T) 88 7.4 l (1.95 US gal) 3.4 l (0.90 US gal)
4TNV94L98(T) 10.5 l (2.77 US gal) 4.5 l (1.19 US gal)
4TNV106(T) (CL class) 14.0 l (3.70 US gal) 9.0 l (2.38 US gal)
4TNV106(T) (VM class) 14.0 l (3.70 US gal) 7.5 l (1.98 US gal)
Lube oil capacity may differ from the above volume de-
pending on an engine installed on a machine unit.
(b) Replenishing oil pan with lube oil
If the remaining engine oil level is low, remove the filler port
cap (B) and fill the oil pan with the specified engine oil to
the specified level through the filler port (C).
NOTE: The oil should not be overfilled to exceed the up-
per limit line. Otherwise a naturally-aspirated engine may
intake lube oil in the combustion chamber during the oper-
ation, then white smoke, oil hummer or urgent rotation may
occur, because the blow-by gas is reduced in the suction
air flow. In case of turbocharged engine oil may jet out from
the breather or the engine may become faulty.
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Coolant check
Daily inspection of coolant water should be done only by
coolant recovery tank.
NOTICE: Never open the radiator filler cap (R) while the
engine and radiator are still hot. Steam and hot water will
spurt out and seriously burn you. Wait until the radiator is
cooled down after the engine has stopped, wrap the filler
cap with a rag piece and turn the cap slowly to gently re-
lease the pressure inside the radiator.
Securely tighten the filler port plug (R) after checking the ra-
diator. Steam can spurt out during engine running, if tight-
ening loose.
(a) Checking coolant water volume
Check the coolant level in the expansion tank (C). If the
water level is close to the LOW mark, open the coolant
expansion tank plug (H) and replenish the tank with soft
clean water up to the FULL mark.
The level shall be between the upper and lower limit lines
on the dipstick.
(b) Replenishing radiator with water
If the coolant recovery tank water level is lower than the
LOW mark, open the radiator cap (R) and check the coolant
water level in the radiator.
Replenish the radiator with coolant, if the level is low.
• Check the coolant level while the engine is cool.
Checking when the engine is hot is dangerous. And
the water volume is expanded due to the heat.
• Daily coolant level check and replenishing shall be
done only from the expansion tank.
Usually do not open the radiator cap to check or re-
plenish.
T. Tighten
L. Loosen
NOTICE: If the coolant water runs short quickly or when the
radiator runs short of water with the coolant expansion tank
level unchanged, water may be leaking or the air tightness
may be lost. Increase in the coolant expansion tank wa-
ter level during operation is not abnormal. The increased
water in the coolant expansion tank returns to the radiator
when the engine is cooled down. If the water level is nor-
mal in the coolant expansion tank but low in the radiator,
check loosened clamping of the rubber hose between the
radiator and coolant recovery tank or tear in the hose.
TULI12EXN4789AB 2
Engine: The radiator shall be filled up.
Model Coolant water volume in an engine
3TNV82A 1.8 l (0.48 US gal)
3TNV84(T)
3TNV88
2.0 l (0.53 US gal)
4TNV84(T)
4TNV88
2.7 l (0.71 US gal)
4TNV94L
4TNV98(T)
4.2 l (1.11 US gal)
4TNV106(T) 6.0 l (1.59 US gal)
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Engine coolant water capacity may differ from the above
volume depending on an engine installed on a machine
unit.
Fuel pipe and coolant pipe inspection and maintenance
Check the rubber hoses for fuel and coolant water pipes
cracked.
If the cracked hose is found, replace it with new one.
Check the loosened clamp.
If found, tighten it.
Inspection and adjustment of governor lever and accelerator
Make sure the accelerator of the machine unit can be oper-
ated smoothly before starting the engine. If it feels heavy to
manipulate, lubricate the accelerator cable joints and piv-
ots. Adjust the accelerator cable if there is a dislocation or
excessive play between the accelerator and the governor
lever. Refer to Engine - Inspect – Every 250 hours or 3
months (10.001) .
Warning lamp and instruments function check
Before and after starting the engine, check to see that the
alarm function normally. Failure of alarm cannot warn the
lack of the engine oil or the coolant water. Make it a rule
to check the alarm operation before and after starting en-
gine every day. Refer to each manual for machine units in
details.
Water separator draining
Drain off the water separator (W) whenever there is a lot
of drain collected in the water separator at the bottom of
the cup (C) even if the time for periodic inspection has not
elapsed yet. The cup of the water separator (C) is made
of semi-transparent material and, in the cup itself, the red
colored floating ring (FR) which rises on the surface of the
drain is installed to visualize the amount of drain. A level
sensor connected to a warning device on the gauge cluster
is provided as optional device.
Drain off the water separator in the following manner:
1. Prepare a waste oil container collecting waste oil.
2. Close the fuel cock (FC).
3. Loosen the drain cock (DC) at the bottom of the
water separator, and drain off any water collected
inside.
4. Tighten the drain cock (DC) manually.
5. Air bleeding from fuel system.
NOTE: If no drain drips when the drain cock is opened,
loosen the air bleeding bolt (A) on the top of the water sep-
arator by turning counterclockwise 2 - 3 times using screw-
driver. (This may occur in case of the water separator po-
sition is higher than the fuel oil level in the fuel tank).
After draining, be sure to tighten the air bleeding bolt (A).
TULI12EXN4795AB 3
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Inspection after initial 50 h operation
Be sure to check the following points after initial 50 h oper-
ation, thereafter every 250 h or 3 months operation.
No. Inspection item
1. Lube oil and filter replacement
2. V-belt tension check
1. Lubricating oil change and filter replacement (1st time)
NOTICE: When an engine is still hot, be careful with a
splash of engine oil which may cause burns. Replace en-
gine oil after the engine oil becomes warm.
It is most effective to drain the engine oil while the engine
is still warm.
In early period of use, the engine oil gets dirty rapidly be-
cause of the initial wear of internal parts. Replace the en-
gine oil earlier. Lube oil filter should also be replaced when
the engine oil is replaced. The procedure of lube oil and
lube oil filter replacement is as follows:
A. Drain engine oil
• Prepare a waste oil container collecting waste oil.
• Remove the oil filler cap to drain easily while draining
the lube oil.
• Loosen the drain plug (DP) using a wrench (cus-
tomer procured) to drain the lube oil.
• Securely tighten the drain plug after draining the lube
oil.
• DP. Drain plug. The location depends on the engine
installed on the machine unit.
NOTE: Use a socket wrench or a closed wrench when re-
moving or tightening a drain plug. Do not use a spanner
because there is the possibility that the spanner slips and
you get hurt.
TULI12EXN4790BB 4
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B. Replacing oil filter
• Turn the lube oil filter (E) counterclockwise using a
filter wrench (customer procured) to remove it.
• Clean the mounting face of the oil filter.
• Moisten the new oil filter gasket with the engine oil
and install the new engine oil filter manually turning it
clockwise until it comes into contact with the mount-
ing surface, and tighten it further to 3/4 of a turn with
the filter wrench.
Tightening torque: 20 - 24 N·m (15 - 18 lb ft)
C. Oil filling and inspection
• Fill with new engine oil until it reaches the specified
level.
NOTICE: Do not overfill the oil pan (O) with engine oil.
Be sure to keep the specified level between upper and
lower limit on the dipstick (D).
T. Tighten
L. Loosen
• Warm up the engine by running for 5 min while
checking any oil leakage.
• Stop the engine after warming up and leave it stop-
ping for about 10 min to recheck the engine oil level
with dipstick and replenish the engine oil. If any oil
is spilled, wipe it away with a clean cloth.
TULI12EXN4791BB 5
When there is not enough tension in the V-belt (V), the
V-belt will slip making it impossible for the alternator (A)
to generate power and cooling water pump and cooling fan
(R) will not work causing the engine to overheat.
Check and adjust the V-belt tension (deflection) in the fol-
lowing manner:
NOTE: Be especially careful not to splash engine oil on the
V-belt, because it will cause slipping, stretching and aging
of the belt.
1. Press the V-belt with your thumb [approximately
98 N (22 lb)] in the middle of the V-belt span to
check the tension (deflection).
Available positions to check and adjust the V-belt
tension (deflection) are at the A, B or C direction
as shown in the Fig. 6.
You may choose a position whichever you can eas-
ily carry out the check and adjustment on the ma-
chine unit.
• “New V-belt” refers to a V-belt which has been used
less than 5 min on a running engine.
• “Used V-belt” refers to a V-belt which has been used
on a running engine for 5 min or more. The specified
deflection to be measured at each position should be
as follows:
TULI12EXN4792AB 6
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Direction A B C
For used V-belt 10 - 14 mm (0.39 - 0.55 in) 7 - 10 mm (0.28 - 0.39 in) 9 - 13 mm (0.35 - 0.51 in)
For new V-belt 8 - 12 mm (0.31 - 0.47 in) 5 - 8 mm (0.20 - 0.31 in) 7 - 11 mm (0.28 - 0.43 in)
2. If necessary, adjust the V-belt tension (deflection).
To adjust the V-belt tension, loosen the setscrew (S)
and move the alternator (A) to tighten the V-belt.
(Adjust the V-belt tension inserting a bar (AV)).
After replacing with a new V-belt and adjusting it,
run the engine for 5 min and readjust the deflection
to the value in the table above.
3. After replacing with a new V-belt and adjusting it,
run the engine for 5 min and readjust the deflection
to the value in the table above.
4. Visually check the V-belt for cracks, oiliness or
wear. If any, replace the V-belt with new one.
TULI12EXN4793AB 7
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Engine - Inspect – Every 50 hours
Be sure to check the following points before starting an
engine every day.
No. Inspection item
1. Fuel tank drain
2. Fuel system bleeding
3. Battery electrolyte level check and battery recharging
Fuel tank drain
1. Prepare a waste oil container collecting waste oil.
2. Remove the drain plug (D) of the fuel tank (F) to
drain (water, dust, etc.) from the fuel tank bottom.
3. Drain until fuel with no water and dust flow out.
Then tighten the drain plug firmly.
TULI12EXN4794AB 1
Fuel system bleeding
Bleed the fuel system according to the following proce-
dures. When there is air in the fuel system, the fuel in-
jection pump (FI) will not be able to operate.
1. Check the fuel oil level in the fuel tank. Refuel if
insufficient.
2. Open the cock (FC) of the water separator (W).
3. Loosen the air bleeding bolt (A) on the water sepa-
rator by turning counterclockwise 2 -3 times using
a screwdriver or a spanner.
4. When the fuel coming out is clear and not mixed
with any bubble, tighten the air bleeding bolt (A).
5. Feed fuel with the fuel priming pump (FP) or elec-
tro-magnetic fuel feed pump.
• In case the engine uses the electro-magnetic fuel
feed pump.
Turn the starter switch to the “ON” position and hold
it in the position for 10 - 15 s to operate the fuel feed
pump.
• In case the engine uses the electro-magnetic fuel
feed pump (FP).
The priming pump is on the top of the fuel filter
mounting. Move the priming pump up and down to
feed fuel until feel your hand slightly heavy.
• Water separator (W)
(Installed on the pipe line)
• Fuel filter (FF)
(Mounting with fuel priming pump) (option)
TULI12EXN4796BB 2
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Battery electrolyte level check and battery recharging
WARNING
Hazardous chemicals!
Battery electrolyte contains sulfuric acid. Contact with skin and eyes could result in severe irritation
and burns. Always wear splash-proof goggles and protective clothing (gloves and aprons). Wash
hands after handling.
Failure to comply could result in death or serious injury.
W0006A
WARNING
Battery acid causes burns. Batteries contain sulfuric acid.
Avoid contact with skin, eyes or clothing. Antidote (external): Flush with water. Antidote (eyes): flush
with water for 15 minutes and seek medical attention immediately. Antidote (internal): Drink large
quantities of water or milk. Do not induce vomiting. Seek medical attention immediately.
Failure to comply could result in death or serious injury.
W0111A
NOTICE: Make sure to turn off the battery switch or disconnect the negative cable (-) before inspecting the electrical
system. Failure to do so could cause short-circuiting and fires.
Always disconnect the (-) Negative battery cable first before disconnecting the battery cables from battery. An acci-
dental “short-circuit” may cause damage, fire and or personal injury.
And remember to connect the (-) Negative battery cable (back onto the battery) LAST.
NOTICE: Keep the area around the battery well ventilated, paying attention to keep away any fire source.
During operation or charging, hydrogen gas is generated from the battery and can be easily ignited.
Battery structure
AP. Anode plate
BC. Battery case
C. Cap
CO. Cover
CP. Cathode plate
G. Glass mat
S. Separator
T. Terminal
TULI12EXN4797AB 3
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Electrolyte level
• Check the electrolyte level (EL) in the battery. When
the amount of fluid nears the lower limit (LL), fill with
battery fluid (available in the market) to the upper
limit (UL). If operation continues with insufficient bat-
tery fluid, the battery life is shortened, and the battery
may overheat and explode.
• Battery fluid tends to evaporate more quickly in the
summer, and the fluid level should be checked ear-
lier than the specified times.
• If the engine cranking speed is so slow that the en-
gine does not start up, recharge the battery.
• If the engine still will not start after charging, replace
the battery.
• Remove the battery from the battery mounting of the
machine unit after daily use if letting the machine unit
leave in the place that the ambient temperature could
drop at 15 °C (59 °F) or less. And store the battery
in a warm place until the next use the unit to start the
engine easily at low ambient temperature.
TULI12EXN4798AB 4
Battery charge
Use a battery tester or hydrometer and check the battery
condition. If the battery is discharged, recharge it.
TULI12EXN4799AB 5
Measurement with a battery tester (BT)
When checking the battery with the batter tester, connect
the red clip of the tester to the battery positive (+) terminal
and black clip to the battery negative (-) terminal by pinch-
ing them securely, and judge the battery charge level from
the indicator position.
Green zone: Normal
Yellow zone: Slightly discharged
Red zone: Defective or much discharged
Measurement with hydrometer
When using a hydrometer, the measured specific gravity
must be corrected according to the temperature at the time
of measurement.
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The specific gravity of battery electrolyte is defined with
20 °C (68 °F) as the standard.
Since the specific gravity increases or decreases by 0.0007
when the temperature varies by 1 °C (34 °F) correct the
value according to the equation below.
TULI12EXN4800AA 6
S20 = St + 0.007(t-20)
t = Electrolyte temperature at measurement
St = Specific gravity at measurement
S20 = Converted specific gravity at 20 °C (68 °F)
Specific gravity and remaining battery charge
Specific gravity ( 20 °C (68 °F)) Discharged quantity of electricity Remaining charge
1.28 0% 100%
1.26 10% 90%
1.24 20% 80%
1.23 25% 75%
(F). Float
(GT). Glass tube
(RB). Rubber bulb
TULI12EXN4801AB 7
1. Terminals
Clean if corroded or soiled.
2. Mounting bracket
Repair or replace it if corroded.
Retighten if loosened.
3. Battery appearance
Replace the battery if cracked or deformed.
Clean with fresh water if contaminated.
TULI12EXN4802AA 8
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Engine - Inspect – Every 250 hours or 3 months
Be sure to check the following points every 250 h or 3
months operation, whichever comes first.
No. Inspection item
1. Lube oil and filter replacement
2. Radiator fin cleaning
4. Inspection and adjustment of governor lever and accelerator
5. Air cleaner cleaning and element replacement
6. Water separator cleaning
Lube oil and filter replacement (The second replacement and after)
Replace the engine oil every 250 h operation from 2nd time
and on. Replace the engine oil filter at the same time.
Radiator fin cleaning
NOTICE: Beware of dirt from air blowing.
Wear protective equipment such as goggles to protect your
eyes when blowing compressed air. Dust or flying debris
can hurt eyes.
Dirt and dust “DD” adhering on the radiator fins (RF) reduce
the cooling performance, causing overheating. Make it a
rule to check the radiator fins daily and clean as needed.
• Blow off dirt and dust from fins and periphery with
compressed air ( 0.19 MPa (28 psi) or less in order
not to damage the fins).
• If contaminated heavily, apply detergent, thoroughly
clean and rinse with tap water shower.
NOTICE: Never use high pressure water or air from close
by fins or never attempt to clean using a wire brush.
Radiator fins (RF) can be damaged.
TULI12EXN4803AB 1
V-belt tension check (The second time and after)
Check and adjust the V-belt tension.
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Inspection and adjustment of governor lever and accelerator
The governor lever (GL) and accelerating devices (accel-
erating lever, pedal, etc.) of the machine unit are con-
nected by an accelerating wire or rod. If the wire becomes
stretched or the connections loose, the deviation in the po-
sition may result and make operation unsafe. Check the
wire periodically and adjust if necessary.
Do not strongly move the accelerating wire or accelerating
pedal. It may deform the governor lever or stretch the wire
to cause irregular engine speed control.
Checking and adjusting procedure are as follows:
• Check that the governor lever (GL) of the engine
makes uniform contact with the high idling (H) and
low idling (LI) limiting screws when the accelerat-
ing devices are in the high idling speed or low idling
speed position.
• If either the high or the low idling speed side does
not make contact with the limiting screw, adjust the
accelerating wire.
Loosen the accelerating wire fastening screw (AF) and ad-
just the wire to contact with the limiting screw.
NOTICE: Never loosen the limiting screws. It will impair
the safety and performance of the product and functions
and result in shorter engine life.
TULI12EXN4804BB 2
Air cleaner cleaning and element replacement
NOTICE: Beware of dirt from air blowing.
Wear protective equipment such as goggles to protect your
eyes when blowing compressed air. Dust or flying debris
can hurt eyes.
The engine performance is adversely affected when the
air cleaner element (E) is clogged by dust. So periodical
cleaning after disassembly is needed.
• Undo the clamps (L) on the dust pan (DP) and re-
move the dust pan.
• Loosen the wing nut on the element and pull out the
element (E).
TULI12EXN4805AB 3
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