Caterpillar Cat 308E2CR Mini Hydraulic Excavator (Prefix W8S) Service Repair Manual (W8S00001 and up).pdf

Service Repair Manual
Models
308E2CR Mini Hydraulic Excavator

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Product: MINI HYD EXCAVATOR
Model: 308E2 CR MINI HYD EXCAVATOR W8S
Configuration: 308E2CR Mini Hydraulic Excavator W8S00001-UP (MACHINE) POWERED BY C3.3B Engine
Disassembly and Assembly
C3.3B Tier 4 Final and EU Stage 3B Engines for Caterpillar Built Machines
Media Number -UENR3278-07 Publication Date -01/09/2014 Date Updated -11/07/2016
i05218929
Diesel Particulate Filter - Remove and Install
SMCS - 108F-010
Removal Procedure
Wear goggles, gloves, protective clothing, and a National Institute for
Occupational Safety and Health (NIOSH) approved P95 or N95 half-
face respirator when handling a used Diesel Particulate Filter or
Catalytic Converter Muffler. Failure to do so could result in personal
injury.
The muffler, catalytic converter/muffler, and diesel particulate filter will
become extremely hot during engine operation. A hot muffler, catalytic
converter/muffler and diesel particulate filter can cause serious burns.
Allow adequate cooling time before working on or near the muffler,
catalytic converter/muffler and diesel particulate filter.
NOTICE
Do not strike any part of the assembly of the Diesel Particulate Filter
(DPF). Do not allow any object to contact the internal element of the
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308E2CR Mini Hydraulic Excavator W8S00001-UP (MACHINE) POWERED BY C3...
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DPF. If the internal element of the DPF becomes damaged, the
assembly must be replaced.
Illustration 1 g03337191
1. Disconnect harness assemblies (1).
2. Remove bolts (2) and bolts (3). Disconnect harness assembly (4) from pressure sensor.
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3. Remove bolts (5) from DPF mount bracket.
4. Use two people to remove diesel particulate filter (6).
5. Remove temperature sensors (7). Remove pressure sensor (8) and tube assemblies (9).
Installation Procedure
1. Install diesel particulate filter (6) in the reverse order of removal.
a. Tighten bolts (5) to a torque of 52 ± 3 N·m (38 ± 2 lb ft).
b. Tighten sensors (7) to a torque of 30 ± 4 N·m (22 ± 3 lb ft).
c. Tighten tube assemblies (9) to a torque of 19 ± 3 N·m (168 ± 27 lb in).
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All Rights Reserved.
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Tue Jan 7 13:56:06 UTC+0800 2020
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i05227613
Inlet Manifold - Remove and Install
SMCS - 1058-010
Removal Procedure
Start By:
a. Remove fuel manifold.
b. Remove exhaust gas recirculation valve.
Note: Refer to Specification UENR3421 "Engine Design" for non-specified engine Torque
Values.
1. Disconnect hose assembly (1) and relocate.
2. Remove bolt (2) and remove tube assembly (3).
3. Remove bolts (4) to remove inlet manifold (5) and the gasket.
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1. Install inlet manifold (5) in the reverse order of removal.
Tue Jan 7 13:57:03 UTC+0800 2020
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i05224034
Inlet and Exhaust Valve Springs - Remove and Install
SMCS - 1108-010
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A
7F-4292 Valve Spring Compressor 1
9U-6144 Adapter 1
Start By:
a. Remove the rocker shaft and push rod.
Values.
Note: The following procedure should be adopted in order to remove the valve springs when the
cylinder head is installed to the engine. Refer to Disassembly and Assembly, "Inlet and Exhaust
Valves - Remove and Install" for the procedure to remove the valve springs from a cylinder head
that has been removed from the engine.
Note: Ensure that the appropriate piston is at top dead center before the valve spring is removed.
Failure to ensure that the piston is at top dead center may allow the valve to drop into the cylinder
bore.
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Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
NOTICE
Ensure that the valve spring is compressed squarely or damage to the
valve stem may occur.
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1. Follow Step 1.a through Step 1.d in order to position the appropriate piston at top dead
center.
a. Install Tooling (A) in position on the cylinder head in order to compress a valve
spring (4) for the appropriate piston.
b. Use Tooling (A) in order to compress valve spring (4) and open the valve slightly.
Note: Do not compress the spring so that valve spring retainer (3) touches the valve
stem seal.
c. Rotate the crankshaft carefully, until the piston touches the valve.
Note: Do not use excessive force to turn the crankshaft. The use of force can result in
bent valve stems.
d. Continue to rotate the crankshaft and gradually release the pressure on Tooling (A)
until the piston is at the top dead center position. The valve is now held in a position
that allows the valve spring to be safely removed.
Note: If all valve springs require replacement, the procedure can be carried out on two
cylinders at the same time. The procedure can be carried out on the following pairs of
cylinders. 1 with 4 and 2 with 3. Ensure that all of the valve springs are installed before
changing from one pair of cylinders to another pair of cylinders.
NOTICE
Do not turn the crankshaft while the valve springs are removed.
2. Remove valve cap (1). Apply sufficient pressure to Tooling (A) in order to allow removal of
valve keepers (2).
Note: Do not compress the spring so that valve spring retainer (3) touches the valve stem
seal.
3. Slowly release pressure on Tooling (A).
4. Remove valve spring retainer (3) and remove valve spring (4).
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5. Remove Tooling (A).
6. Remove valve stem seals (5).
7. Repeat Step 2 through Step 5 in order to remove the remaining valve springs from the
appropriate cylinder.
1. Install the inlet and exhaust valve springs in the reverse order of removal.
a. Install valve springs with the smaller pitch end (6) downward on cylinder head side.
b. Inspect valve springs (4) for damage and for the correct length. Refer to
Specifications, "Cylinder Head Valves " for further information.
Tue Jan 7 13:57:59 UTC+0800 2020
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i05224035
Inlet and Exhaust Valves - Remove and Install
SMCS - 1105-010
Removal Procedure
Table 1
Required Tools
A 5S-1330 Valve Spring Compressor 1
Start By:
a. Remove cylinder head.
Values.
1. Clean the bottom mating surface of the cylinder head. Check the depth of the valves below
the face of the cylinder head before the valve springs are removed. Refer to Specifications,
"Cylinder Head Valves" for the correct dimensions.
2. Place a temporary identification mark on the heads of the valves in order to identify the
correct position.
3. Use a suitable lifting device to position the cylinder head with the valve springs upward.
The weight of the cylinder head is approximately 23 kg (51 lb).
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4. Install Tooling (A) in position on cylinder head (2) and compress the valve spring in order
to remove inlet and exhaust valves (1).
Personal injury can result from being struck by parts propelled by a
released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to
release the spring force.
NOTICE
Ensure that the valve spring is compressed squarely or damage to the
valve stem may occur.
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5. Apply sufficient pressure to Tooling (A) in order to remove valve keepers (3).
6. Slowly release pressure on Tooling (A).
7. Place a temporary identification mark on valve spring (5) in order to identify the correct
position.
8. Remove valve spring retainer (4). Remove valve spring (5) and inlet and exhaust valves (6).
9. Repeat Step 4 through Step 8 for the remaining valves.
10. Remove Tooling (A).
11. Remove valve stem seals (7) from cylinder head (2).
12. Use a suitable lifting device in order to turn over cylinder head (2).
13. Remove the inlet and exhaust valves.
1. Install inlet and exhaust valves (6) in the reverse order of removal.
a. Clean all components of the cylinder head assembly. Ensure that all ports, all coolant
passages, and all lubrication passages in the cylinder head are free from debris.
Replace any components that are worn or damaged.
b. Lubricate the stems of inlet and exhaust valves (6) with clean engine oil. Install inlet
and exhaust valves (6) in the appropriate positions in the cylinder head. Check the
depth of the valves below the face of the cylinder head. Refer to System Operation,
Testing and Adjusting, "Valve Depth - Inspect" for more information.
Tue Jan 7 13:58:56 UTC+0800 2020
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i05305972
Inlet and Exhaust Valve Guides - Remove and Install
SMCS - 1104-010
Removal Procedure
Table 1
Required Tools
A 390-1136 Valve Guide Driver Kit 1
B 385-8470 Valve Guide Reamer 1
Start By:
a. Remove the inlet and exhaust valves.
Note: Refer to Specifications, "Engine Design" for non-specified engine torque values.
NOTICE
Removal and installation of the valve guide and valve seat must be
carried out by personnel with the correct training. Also special
machinery is required. For more information, refer to your authorized
Caterpillar dealer.
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1. Remove inlet and exhaust valve seals (1). Use Tooling (A) in order to remove valve guides
(2) from cylinder head (3).
2. Repeat the Step 1 for the remaining inlet and exhaust valve guides.
Note: Ensure that the cylinder head is clean and free from machining debris. Clean the
parent bores in the cylinder head and lubricate the new valve guides.
1. Install inlet and exhaust valve guides (2) in the reverse order of removal.
a. Use Tooling (A) to install inlet and exhaust valve guides (2).
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b. Use Tooling (B) to resize the new inlet and exhaust valve guides. Refer to
Specifications, "Cylinder Head Valves" for the allowable clearance between the valve
stem and valve guide.
Tue Jan 7 13:59:53 UTC+0800 2020
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i05223991
Engine Oil Cooler - Remove and Install
SMCS - 1378-010
Removal Procedure
Values.
1. Refer to Operation and Maintenance Manual, "Cooling System Coolant (ELC) - Change"
for the correct draining and filling procedures.
2. Remove engine oil filter (3) from engine oil cooler (1).
3. Disconnect hose assemblies (2) and (4).
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4. Remove center stud (5) and remove engine oil cooler (1) from the locator.
5. Remove the O-ring seal from engine oil cooler (1).
1. Install engine oil cooler (1) in the reverse order of removal.
a. Install the O-ring seal. Position engine oil cooler (1) on the locator on the front
housing. Install center stud (5). Tighten center stud (5) to a torque of 40 to 44 N·m
(29 to 33 lb ft).
Tue Jan 7 14:00:50 UTC+0800 2020
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i05224010
Engine Oil Relief Valve - Remove and Install
SMCS - 1315-010
Removal Procedure
Values.
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Caterpillar Cat 308E2CR Mini Hydraulic Excavator (Prefix W8S) Service Repair Manual (W8S00001 and up).pdf

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