Caterpillar cat 938 g wheel loader (prefix 9hs) service repair manual (9hs00001 and up)

Service Repair Manual
Models
938G WHEEL LOADER

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Product: WHEEL LOADER
Model: 938G WHEEL LOADER 9HS
Configuration: 938G WHEEL LOADER 9HS00001-UP (MACHINE) POWERED BY 3126 Engine
Disassembly and Assembly
446 and 446B Backhoe Loaders, Lexion 450 Combine, 3114 and 3116 Engines,
IT18F Integrated Toolcarrier, D6M Track-Type Tractor and 928F, 950F and 950G
Wheel Loaders
Media Number -SENR3611-18 Publication Date -01/05/2009 Date Updated -27/05/2009
i01935828
Cylinder Head - Remove
SMCS - 1100-011
Removal Procedure
Start By:
a. Remove the fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base -
Remove and Install".
b. Remove the governor. Refer to Disassembly and Assembly, "Governor - Remove".
c. Remove the fuel control linkage. Refer to Disassembly and Assembly, "Fuel Injection
Control Linkage - Remove".
d. Remove the unit injectors. Refer to Disassembly and Assembly, "Unit Injector - Remove".
e. Remove the water temperature regulator housing. Refer to Disassembly and Assembly,
"Water Temperature Regulator Housing - Remove and Install".
f. Remove the inlet manifold. Refer to Disassembly and Assembly, "Inlet Manifold -
Remove".
g. Remove the exhaust manifold. Refer to Disassembly and Assembly, "Exhaust Manifold -
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
1/3938G WHEEL LOADER 9HS00001-UP (MACHINE) POWERED BY 3126 Engine(...
2020/3/15https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

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, "Dealer Service Tool
Catalog" for tools and supplies suitable to collect and contain fluids on
Cat products.
Dispose of all fluids according to local regulations and mandates.
Note: For information on the reusability of the cylinder head, refer to Guideline For Reusable
Parts And Salvage Operations, SEBF8218, "Specifications for Cylinder Head Assemblies 3114,
3116, and 3126 Engines" and Guideline For Reusable Parts And Salvage Operations, SEBF8162,
"Procedure to Measure and Salvage Cylinder Head Assemblies and Related Components".
Illustration 1 g01007597
Typical example
1. Attach a suitable lifting device to the cylinder head.

2. Remove bolts (1) and (2) that hold the cylinder head to the cylinder block. Carefully remove
the cylinder head from the cylinder block. The cylinder head for the 3116 engine weighs
approximately 85 kg (187 lb).
3. Remove cylinder head gasket (3).
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All Rights Reserved.
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Sun Mar 15 22:46:38 UTC+0800 2020

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Wheel Loaders
i04147334
Cylinder Head - Install
SMCS - 1100-012
Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 6V-4876 Lubricant 1
NOTICE
Note: For information on the reusability of the cylinder head, refer to Guideline For Reusable
Parts And Salvage Operations, SEBF8218, "Specifications for Cylinder Head Assemblies 3114,
3116, and 3126 Engines" and Guideline For Reusable Parts And Salvage Operations, SEBF8162,
"Procedure to Measure and Salvage Cylinder Head Assemblies and Related Components".
1. Thoroughly clean the mating surfaces of the cylinder head and the cylinder block.

Typical example
2. Install a new cylinder head gasket (3) .
Note: For information on the cylinder head gasket for 3116 engines, refer to Special
Instruction, SEHS9395, "3116 Cylinder Head Gasket Usage".
Typical example
Note: To avoid damage to the cylinder head gasket, use guide bolts of an appropriate size to
install the cylinder head.
3. Attach a suitable lifting device to the cylinder head. Position the cylinder head assembly
onto the dowels in the cylinder block. Lower the cylinder head onto the cylinder block.

4. Inspect the condition of cylinder head bolts (1) and (2) . For information on the reusability
of the bolts, refer to Guideline For Reusable Parts And Salvage Operations, SEBF8301,
"Inspection and Reuse of Critical Fasteners Used in All Engines". Replace cylinder head
bolts (1) and (2) , if necessary.
5. Lubricate cylinder head bolts (1) and (2) and both sides of the washers with Tooling (A) .
Install cylinder head bolts (1) and (2) . Follow Step 6 for the correct tightening procedure.
3114 Cylinder head

6. Tighten the cylinder head bolts according to the following procedure:
7. Tighten bolts (1) through bolt (14) in a numerical sequence to a torque of 300 ± 15 N·m
(221 ± 11 lb ft).
8. Loosen bolts (1) through bolt (14) to a torque of 0 N·m.
9. Tighten bolts (1) through bolt (14) again in a numerical sequence to a torque of 130 ± 15
N·m (96 ± 11 lb ft).
10. Retighten bolts (1) through bolt (14) again in a numerical sequence to a torque of 130 ± 15
N·m (96 ± 11 lb ft).
11. Turn bolts (1) through bolt (14) by numerical sequence an additional 90° (1/4 turn).
12. Tighten bolt (15) through bolt (20) in a numerical sequence to a torque of 55 ± 7 N·m (41 ±
5 lb ft).
End By:
a. Install the exhaust manifold. Refer to Disassembly and Assembly, "Exhaust Manifold -
b. Install the inlet manifold. Refer to Disassembly and Assembly, "Inlet Manifold - Install".
c. Install the water temperature regulator housing. Refer to Disassembly and Assembly,
"Water Temperature Regulator Housing- Remove and Install".
d. Install the unit injectors. Refer to Disassembly and Assembly, "Unit Injector - Install".
e. Install the fuel control linkage. Refer to Disassembly and Assembly, "Fuel Injection Control
Linkage - Install".
f. Install the governor. Refer to Disassembly and Assembly, "Governor - Install".
g. Install the fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base - Remove
and Install".

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Wheel Loaders
i01930413
Lifter Group - Remove and Install
SMCS - 1209-010
Removal Procedure
Start By:
a. Remove the rocker shaft and the pushrods. Refer to Disassembly and Assembly, "Rocker
Shaft and Pushrod - Remove".
NOTICE
NOTICE
containing fluids.
Cat products.

Note: For information on reusability of components of the lifter group, refer to Guideline For
Reusable Parts And Salvage Operations, SEBF8264, "Camshaft Roller Followers Used in 3114
and 3116 Engines" and Guideline For Reusable Parts And Salvage Operations, SEBF8067,
"Slipper Followers and Camshaft Roller Followers".
1. Remove bolts (1) from cover (2).
2. Carefully remove cover (2) and the gasket.
Note: It may be necessary to remove the governor in order to remove the cover at the front
of the engine.
3. Remove bolts (4), lifter shaft (5), and lifters (3) from cover (2).

NOTICE
Note: For information on reusability of components of the lifter group, refer to Guideline For
Reusable Parts And Salvage Operations, SEBF8264, "Camshaft Roller Followers Used in 3114
and 3116 Engines" and Guideline For Reusable Parts And Salvage Operations, SEBF8067,
"Slipper Followers and Camshaft Roller Followers".
1. Position lifters (3) and lifter shaft (5) on cover (2). Install bolts (4).
2. Position the gasket and cover (2) on the engine.
3. Install bolts (1) in cover (2).
End By:

a. Install the rocker shaft and the pushrods. Refer to Disassembly and Assembly, "Rocker
Shaft and Pushrod - Install".
Sun Mar 15 22:48:29 UTC+0800 2020

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Wheel Loaders
i01930426
Camshaft - Remove
SMCS - 1210-011
Removal Procedure
Start By:
a. Remove the governor. Refer to Disassembly and Assembly, "Governor - Remove".
b. Remove the side covers. Refer to Disassembly and Assembly, "Lifter Group - Remove and
Install".
c. Remove the front cover. Refer to Disassembly and Assembly, "Front Cover - Remove".
NOTICE
NOTICE
containing fluids.

Cat products.
Note: For information on reusability of the camshaft, refer to Guideline For Reusable Parts And
Salvage Operations, SEBF8097, "Camshaft Measurement", Guideline For Reusable Parts And
Salvage Operations, SEBF8146, "Visual Inspection of Camshafts", and Guideline For Reusable
Parts And Salvage Operations, SEBF8251, "Specifications for Measurement of Camshafts in
3114/3116 Engines". For information on reusability of the camshaft gear, refer to Guideline For
Reusable Parts And Salvage Operations, SEBF8045, "Timing Gears for All Engines".
Note: The air compressor was removed in order to accommodate the engine repair stand.
Note: It is not necessary to remove the cylinder head for removal of the camshaft.
1. Turn the crankshaft to top center compression stroke for the No. 1 piston. Install the timing
bolt in the flywheel. This is for timing during installation.
Typical example
2. Ensure that timing mark (1) on the camshaft gear is aligned with timing mark (2) on the
idler gear.

3. Remove bolts (4) and camshaft retainer plate (6).
4. Remove camshaft gear (5) and camshaft (3) from the cylinder block.
Sun Mar 15 22:49:25 UTC+0800 2020

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Wheel Loaders
i01936378
Camshaft - Install
SMCS - 1210-012
NOTICE
Note: For information on reusability of the camshaft, refer to Guideline For Reusable Parts And
Salvage Operations, SEBF8097, "Camshaft Measurement", Guideline For Reusable Parts And
Salvage Operations, SEBF8146, "Visual Inspection of Camshafts", and Guideline For Reusable
Parts And Salvage Operations, SEBF8251, "Specifications for Measurement of Camshafts in
3114/3116 Engines". For information on reusability of the camshaft gear, refer to Guideline For
Reusable Parts And Salvage Operations, SEBF8045, "Timing Gears for All Engines".
1. Lubricate the camshaft and the camshaft bearings with clean engine oil.

2. Carefully install camshaft (3) and camshaft gear (5) in the engine.
NOTICE
When installing the camshaft, make sure the number one cylinder is at
top center of the compression stroke with the timing bolt installed in
the flywheel. The camshaft timing is very important. The timing mark
on the camshaft drive gear must line up with the timing mark on the
idler gear. Refer to the Specifications Manual for more information.
Typical example
3. Ensure that timing mark (1) on the camshaft gear is aligned with timing mark (2) on the
idler gear.

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4. Install camshaft retainer plate (6) and bolts (4).
End By:
a. Install the front cover. Refer to Disassembly and Assembly, "Front Cover - Install".
b. Install the side cover. Refer to Disassembly and Assembly, "Lifter Group - Remove and
Install".
c. Install the governor. Refer to Disassembly and Assembly, "Governor - Install".
Sun Mar 15 22:50:21 UTC+0800 2020

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Wheel Loaders
i01171077
Camshaft Gear - Remove and Install
SMCS - 1210-010-GE
Removal Procedure
Start By:
a. Remove the camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove".
Note: For information on reusability of the camshaft gear, refer to Guideline For Reusable Parts
And Salvage Operations, SEBF8045, "Timing Gears for All Engines".
1. Wrap the camshaft with a protective covering in order to prevent damage to the camshaft.
NOTICE

Do not allow the camshaft to fall to the floor when pressing it from the
drive gear. Also make sure that the camshaft lobes do not catch on the
press plates.
2. Place the camshaft and camshaft gear (1) in a suitable press. Press the camshaft from
camshaft gear (1).
Note: For information on reusability of the camshaft gear, refer to Guideline For Reusable Parts
And Salvage Operations, SEBF8045, "Timing Gears for All Engines".
1. Heat the camshaft gear to a maximum temperature of 315 °C (600 °F).
2. Align the key in the camshaft with the groove (keyway) in the camshaft gear.
3. Install the camshaft gear on the end of the camshaft.
End By:
a. Install the camshaft. Refer to Disassembly and Assembly, "Camshaft - Install".
Sun Mar 15 22:51:16 UTC+0800 2020

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Wheel Loaders
i02183087
Camshaft Bearings - Remove and Install
SMCS - 1211-010
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 8S-2241 Camshaft Bearing Tool Group 1
Start By:
a. Remove the camshaft. Refer to Disassembly and Assembly, "Camshaft - Remove".
NOTICE
NOTICE

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