Caterpillar Cat 345B Series II Excavator (Prefix AKJ) Service Repair Manual (AKJ00001 and up).pdf

Service Repair Manual
Models
345B and 345B L Series II
Excavator

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Product: EXCAVATOR
Model: 345B II EXCAVATOR AKJ
Configuration: 345B & 345B L Series II Excavators AKJ00001-UP (MACHINE) POWERED BY 3176C Engine
Disassembly and Assembly
3176C and 3196 Engines for Caterpillar Built Machines
Media Number -RENR1223-15 Publication Date -01/08/2015 Date Updated -03/08/2015
i01970055
Connecting Rod Bearings - Install
SMCS - 1219-012
Installation Procedure
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
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345B & 345B L Series II Excavators AKJ00001-UP (MACHINE) POWERED BY 31...
2020/9/11
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Illustration 1 g01022743
1. Install the upper half of connecting rod bearing (4) into connecting rod (3). Ensure that the
bearing tab engages with the slot in the connecting rod.
2. Apply clean engine oil on the surface of the upper half of connecting rod bearing (4) .
3. Position connecting rod (3) and connecting rod bearing (4) on the crankshaft.
4. Install the lower half of connecting rod bearing (5) in corresponding connecting rod cap (2).
Ensure that the bearing tab engages with the groove in connecting rod cap (2) .
5. Apply clean engine oil on the surface of the lower half of connecting rod bearing (5) .
6. Install connecting rod cap (2) on the corresponding connecting rod. Ensure that the numbers
are on the same side.
7. Install connecting rod cap bolts (1). Tighten the bolts to a torque of 130 ± 7 N·m (95 ± 5 lb
ft).
8. Place an index mark on each bolt head. Tighten each bolt for an additional 60 ± 5 degrees
(1/6 turn).
9. Repeat Steps 1 through 8 in order to install the remaining connecting rod bearings.
End By: Install the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan -
Remove and Install".
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Product: EXCAVATOR
i02087520
Crankshaft Main Bearings - Remove
SMCS - 1203-011
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 2P-5518 Bearing Tool 1
Start By:
A. Remove the oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove and
Install".
NOTICE
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1. Remove bolts (1) that hold crankshaft main bearing cap (2). Remove crankshaft main
bearing cap (2) .
2. Remove the lower half of the crankshaft main bearing from crankshaft main bearing cap
(2) .
NOTICE
If the crankshaft is turned in the wrong direction, the tab of the
crankshaft main bearing will be pushed between the crankshaft and
the cylinder block. this can cause damage to either or both the
crankshaft and the cylinder block.
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3. Use the following steps in order to remove the upper half of crankshaft main bearings (3) :
a. Turn the crankshaft until Tooling (A) can be installed in the crankshaft journal. Install
Tooling (A) .
b. Turn the crankshaft in order to remove the upper half of the crankshaft main bearing.
In order to get the tab out first, the crankshaft must be turned in the correct direction.
c. Check the condition of the crankshaft main bearings. Refer to the Guideline For
Reusable Parts, SEBF8009, "Main and Connecting Rod Bearings" or refer to the
Guideline For Reusable Parts, SEBV0544, "Engine Bearings and Crankshafts".
4. Remove thrust plate (4) from the crankshaft.
Fri Sep 11 23:25:28 UTC+0800 2020
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Product: EXCAVATOR
i03575020
Crankshaft Main Bearings - Install
SMCS - 1203-012
Table 1
Required Tools
A 2P-5518 Bearing Tool 1
B 8T-5096 Dial Indicator Group 1
C 6V-4876 Lubrication -
NOTICE
Note: Place clean engine oil on the crankshaft main bearings prior to assembly. Ensure that the
tabs on the back side of the crankshaft main bearings fit in the grooves of the crankshaft main
bearing caps and the cylinder block.
NOTICE
Ensure that the crankshaft main bearings are installed in the correct
locations. Two different part numbers are used in quantities of three
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and four. The part number having the quantity of four is to be
installed on crankshaft main bearings 2, 3, 5, and 6. The part number
having the quantity of three is to be installed on crankshaft bearing 1,
4, and 7. The thrust plate is to be installed on the center crankshaft
main bearing only.
1. Install thrust plate (4) on the crankshaft.
2. Use Tooling (A) and install the new upper halves of crankshaft main bearings (3) in the
cylinder block. This half of the bearing has an oil hole. Do not put oil on the back of the
crankshaft main bearing.
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3. Install the new lower halves of the crankshaft main bearings in crankshaft main bearing caps
(2) . Do not put oil on the back of the crankshaft main bearing.
NOTICE
Crankshaft main bearing caps should be installed with the part
number toward the right side of the engine. Crankshaft main bearing
caps are to be identified by stamped numbers 1 through 7 located on
the bottom surface. The thrust plate is to be installed in the original
position on the crankshaft main bearing.
4. Place crankshaft main bearing caps (2) in position on the cylinder block. Place clean engine
oil or Tooling (C) on the bolt threads and the washer face. Install bolts (1) .
5. Tighten the bolts to a torque of 95 ± 5 N·m (70 ± 4 lb ft). Place an index mark on each bolt
head. Tighten each bolt for an additional 90 ± 5 degrees (1/4 turn).
6. Check the end play of the crankshaft with Tooling (B) . The end play must be 0.10 mm
(0.004 inch) to 0.50 mm (0.020 inch).
Note: The crankshaft end play is controlled by crankshaft thrust bearings (4) . Thrust
bearings (4) are located at the center of the crankshaft.
End By: Install the oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove and
Install".
Fri Sep 11 23:26:25 UTC+0800 2020
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Product: EXCAVATOR
i02077605
Crankshaft - Remove
SMCS - 1202-011
Removal Procedure
Start By:
A. Remove the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump -
Remove".
B. Remove the front housing. Refer to Disassembly and Assembly, "Housing (Front) -
Remove".
C. Remove the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing -
D. Remove the pistons and connecting rods. Refer to Disassembly and Assembly, "Pistons and
Connecting Rods - Remove".
NOTICE
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1. Remove bolts (1) .
2. Remove crankshaft main bearing caps (2) .
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3. Remove crankshaft thrust bearings (4) and lower halves of crankshaft main bearings (3) .
Note: The crankshaft main bearing caps are marked with the numbers 1 through 7. The
crankshaft main bearing caps that are not marked should be marked with the corresponding
cylinder number on the side that is toward the right side of the engine.
4. Install a suitable bolt into each end of the crankshaft. Fasten a suitable lifting device to the
bolts in the crankshaft. Remove the crankshaft. The weight of the crankshaft is
approximately 129 kg (285 lb).
5. Remove the upper halves of the crankshaft main bearings (3) .
Fri Sep 11 23:27:21 UTC+0800 2020
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Product: EXCAVATOR
i02363483
Crankshaft - Install
SMCS - 1202-012
Table 1
Required Tools
A 8T-5096 Dial Indicator Group 1
NOTICE
NOTICE
Ensure that the crankshaft main bearing tabs engage with the grooves
in the block and the crankshaft main bearing cap.
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1. Place the upper halves of crankshaft main bearings (3) in the cylinder block. Place the lower
halves of crankshaft main bearings (3) in the crankshaft main bearing caps.
2. Fasten a suitable lifting device to the crankshaft and place the crankshaft in the cylinder
block. The weight of the crankshaft is approximately 129 kg (285 lb).
3. Install crankshaft thrust bearings (4) .
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4. Install crankshaft main bearing caps (2) with the part numbers toward the right hand side of
the cylinder block. Ensure that crankshaft main bearing caps (2) have numbers 1 through 7.
The numbers should start at the front of the engine. Place clean engine oil or Molylube on
the bolt threads and the washers. Install bolts (1) . Tighten the bolts to a torque of 95 ± 5
N·m (70 ± 4 lb ft).
5. Place an index mark on each bolt head. Turn the bolts for an additional 90 ± 5 degrees (1/4
turn).
6. Check the end play of the crankshaft with Tooling (A) . The end play must be 0.10 mm
(0.004 inch) to 0.50 mm (0.020 inch).
End By:
a. Install the pistons and connecting rods. Refer to Disassembly and Assembly, "Pistons and
Connecting Rods - Install".
b. Install the flywheel housing. Refer to Disassembly and Assembly, "Flywheel Housing -
c. Install the front housing. Refer to Disassembly and Assembly, "Housing (Front) - Install".
d. Install the engine oil pump. Refer to Disassembly and Assembly, "Engine Oil Pump -
Install".
Fri Sep 11 23:28:18 UTC+0800 2020
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Product: EXCAVATOR
i06284232
Crankshaft Gear - Remove and Install
SMCS - 1204-010-GE
Removal Procedure
Table 1
Required Tools
A 1U-6400 Three Jaw Puller 1
Start By:
A. Remove the crankshaft. Refer to Disassembly and Assembly, "Crankshaft - Remove".
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1. Use Tooling (A) in order to remove crankshaft gear (2) from crankshaft (1) .
2. Remove drive pin (3) .
Table 2
Required Tools
B 6V-2098 Press Sleeve 1
C 8H-8581 Gauge 1
1. Install drive pin (3) .
Always wear protective gloves when handling parts that have been
heated.
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Note: Do not use a torch to heat the gear. The gear can be warped if a torch is used. The
hardness of the gear may also be changed with the use of a torch.
2. Preheat the oven to a maximum temperature of 210° C (410° F).
3. Heat crankshaft gear (2) in the oven for a maximum of one hour.
4. Install crankshaft gear (2) on the end of crankshaft (1) . Ensure that the slot in crankshaft
gear (2) is aligned with drive pin (3) .
5. If crankshaft gear (2) does not fit and the gear was not heated during the removal of the gear
then repeat Step 2 thru Step 4. Do not heat the gear more than two times during the life of
crankshaft gear (2) .
6. Use Tooling (B) in order to seat crankshaft gear (2) against the shoulder of crankshaft (1) .
7. Use Tooling (C) in order to ensure that crankshaft gear (2) is seated against the shoulder on
the crankshaft.
Note: Check the crankshaft gear in three places with Tooling (C) .
End By: Install the crankshaft. Refer to Disassembly and Assembly, "Crankshaft - Install".
Fri Sep 11 23:29:15 UTC+0800 2020
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Product: EXCAVATOR
i05977048
Bearing Clearance - Check
SMCS - 1203-535; 1219-535
Measurement Procedure
Table 1
Required Tools
A
198-9142
Plastic Gauge (Green)
0.025 to 0.076 mm
(0.001 to 0.003 inch)
1
198-9143
Plastic Gauge (Red)
0.051 to 0.152 mm
(0.002 to 0.006 inch)
1
198-9144
Plastic Gauge (Blue)
0.102 to 0.229 mm
(0.004 to 0.009 inch)
1
198-9145
Plastic Gauge (Yellow)
0.230 to 0.510 mm
(0.009 to 0.020 inch)
1
Note: Plastic gauge may not be necessary when the engine is in the chassis.
NOTICE
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Note: Cat does not recommend the checking of the actual bearing clearances particularly on small
engines. This is because of the possibility of obtaining inaccurate results and the possibility of
damaging the bearing or the journal surfaces. Each Cat engine bearing is quality checked for
specific wall thickness.
Note: The measurements should be within specifications and the correct bearings should be used.
If the crankshaft journals and the bores for the block and the rods were measured during
disassembly, no further checks are necessary. However, if the technician still wants to measure the
bearing clearances, Tooling (A) is an acceptable method. Tooling (A) is less accurate on journals
with small diameters if clearances are less than 0.10 mm (0.004 inch).
NOTICE
Lead wire, shim stock or a dial bore gauge can damage the bearing
surfaces.
The technician must be very careful to use Tooling (A) correctly. The following points must be
remembered:
• Ensure that the backs of the bearings and the bores are clean and dry.
• Ensure that the bearing locking tabs are properly seated in the tab grooves.
• The crankshaft must be free of oil at the contact points of Tooling (A).
1. Put a piece of Tooling (A) on the crown of the bearing that is in the cap.
Note: Do not allow Tooling (A) to extend over the edge of the bearing.
2. Use the correct torque-turn specifications in order to install the bearing cap. Do not use an
impact wrench. Be careful not to dislodge the bearing when the cap is installed.
Note: Do not turn the crankshaft when Tooling (A) is installed.
3. Carefully remove the cap, but do not remove Tooling (A). Measure the width of Tooling
(A) while Tooling (A) is in the bearing cap or on the crankshaft journal. Refer to Illustration
1.
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Typical Example
4. Remove all of Tooling (A) before you install the bearing cap.
Note: When Tooling (A) is used, the readings can sometimes be unclear. For example, all
parts of Tooling (A) are not the same width. Measure the major width in order to ensure that
the parts are within the specification range. Refer to Specifications Manual, "Connecting
Rod Bearing Journal" and Specifications Manual, "Main Bearing Journal" for the correct
clearances.
Fri Sep 11 23:30:12 UTC+0800 2020
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Product: EXCAVATOR
i02360598
Coolant Temperature Sensor - Remove and Install
SMCS - 1906-010
Removal Procedure
Personal injury can result from hot coolant, steam and alkali.
At operating temperature, engine coolant is hot and under pressure.
The radiator and all lines to heaters or the engine contain hot coolant or
steam. Any contact can cause severe burns.
Remove cooling system pressure cap slowly to relieve pressure only
when engine is stopped and cooling system pressure cap is cool enough
to touch with your bare hand.
Do not attempt to tighten hose connections when the coolant is hot, the
hose can come off causing burns.
Cooling System Coolant Additive contains alkali. Avoid contact with
skin and eyes.
NOTICE
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NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
of the product. Be prepared to collect the fluid with suitable containers
before opening any compartment or disassembling any component
containing fluids.
Refer to Special Publication, NENG2500, "Caterpillar Dealer Service
Tool Catalog" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
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1. Drain the level of the coolant below the coolant temperature sensor into a suitable container
for storage or disposal. Refer to Operation and Maintenance Manual, "Cooling System
Coolant (ELC) - Change".
2. Disconnect the harness assembly from coolant temperature sensor (1) .
3. Remove coolant temperature sensor (1) .
4. Inspect the condition of the O-ring seal on coolant temperature sensor (1) . Replace the O-
ring seal, if necessary.
NOTICE
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1. Install coolant temperature sensor (1) . Tighten coolant temperature sensor (1) to a torque of
20 ± 5 N·m (15 ± 4 lb ft).
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Caterpillar Cat 345B Series II Excavator (Prefix AKJ) Service Repair Manual (AKJ00001 and up).pdf

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