Caterpillar cat 321 c excavator (prefix kbb) service repair manual (kbb00001 and up)

Service Repair Manual
Model
321C EXCAVATOR

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Product: EXCAVATOR
Model: 321C EXCAVATOR KBB
Configuration: ISJ HEX COMMONALITY CHART KBB00001-UP (MACHINE)
Disassembly and Assembly
3064 and 3066 Engines for Caterpillar Built Machines
Media Number -SENR5553-10 Publication Date -01/05/2012 Date Updated -15/05/2012
i01615293
Engine Oil Bypass Valve - Remove and Install
SMCS - 1306-010-BV
Removal Procedure
Start By:
A. Remove the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan - Remove
and Install".
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
Illustration 1 g00607679
1/3ISJ HEX COMMONALITY CHART KBB00001-UP (MACHINE)(SEBP5600 - 00) - ...
2019/10/2https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

1. Remove threaded plug (1) for the engine oil bypass valve from the cylinder block (2) .
2. Remove shim (3) from the cylinder block (2) .
3. Remove spring (4) from the cylinder block (2) .
4. Remove spring seat (5) from the cylinder block (2) .
Note: Check the spring seat (5) and the valve seat for an abnormal contact pattern. Inspect the
spring (4) for weakness or damage. If necessary, replace the engine oil bypass valve with a new
part.
Note: Check the cylinder block (2) for oil passages that are clogged.
Installation Procedure
NOTICE

1. Install spring seat (5) (not shown) and spring (4) in the cylinder block (2) .
2. Install shim (3) and threaded plug (1) in the cylinder block (2) .
3. Tighten the threaded plug (1) to a torque of 69 ± 5 N·m (51 ± 4 lb ft).
Note: Test the opening pressure for the engine oil relief valve. The opening pressure for the
relief valve is 981 ± 98 kPa (142 ± 14 psi). Make adjustments by shimming, if necessary.
For information on testing the engine oil relief valve, refer to Testing and Adjusting, "Lubrication
System".
For more information, refer to Specifications, "Engine Oil Bypass Valve".
End By: Install the engine oil pan. Refer to Disassembly and Assembly, "Engine Oil Pan -
Remove and Install".
Copyright 1993 - 2019 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Wed Oct 2 22:32:18 UTC+0800 2019

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Product: EXCAVATOR
i01146335
Engine Oil Pump - Remove
SMCS - 1304-011
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-2320 Combination Puller 1
B 1P-0510 Driver Group 1
Start By:
A. Remove the front housing. Refer to Disassembly and Assembly, "Housing (Front) -
Remove".
NOTICE
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 Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
Note: Illustration 1 does not show that the front housing is removed from the cylinder
block.
1. Remove bolt (1) from the cover (2) .
2. Remove cover (2) for the engine oil pump from the front housing. Check gasket (3) (not
shown) for damage or wear. Replace the gasket, if the gasket is worn or damaged.

3. Remove driven gear (4) for the oil pump. Pull the gear straight out of the front housing (5)
(slip fit).
4. Position the front housing on a work bench in order to remove the oil pump gear from the
rear of the housing.
5. Use Tool (A) to remove oil pump gear (6) from the front housing.
6. Position the front housing on a work bench in order to remove the drive gear from the front
of the housing.
7. Remove drive gear (7) from the front housing.

8. Use Tool (B) to remove front oil seal (8) (not shown) from the front housing.
Note: Illustration 6 does not show that the front seal (8) is removed.
9. Remove set screw (9) from the front housing.

Note: Illustration 7 does not show that the front seal (8) is removed.
10. Remove spindle (10) and idler gear (11) as an assembly. Push on the gear with a hardwood
bar (12) through the mounting hole for the front seal. Rotate the gear while the gear is
pushed.
Note: Use care not to damage the pump idler gear and the crankshaft gear.
Note: Replace the drive gear and the driven gear as an assembly.
Note: Do not attempt to reuse the oil pump gear and drive gear assembly. Replace the oil pump
gear and the drive gear assembly with new parts.
Note: Check all of the gears for worn teeth or damaged teeth. Replace the gears, if necessary.
Wed Oct 2 22:33:14 UTC+0800 2019

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Product: EXCAVATOR
i01146555
Engine Oil Pump - Install
SMCS - 1304-012
Installation Procedure
Table 1
Required Tools
A 1P-0510 Driver Group 1
NOTICE

1. Use Tool (A) to install the front oil seal (8) (not shown).
2. Lower the temperature of the spindle (10). Install spindle (10) and idler gear (11) as an
assembly in the front housing.
Note: The temperature of the spindle is lowered in order to ease the installation of the
spindle in the front housing.
3. Install set screw (9) in the front housing.

4. Lower the temperature of the drive gear assembly. Install drive gear (7) in the front housing.
Note: The temperature of the drive gear assembly is lowered in order to ease the installation
of the drive gear assembly in the front housing.
Always wear protective gloves when handling parts that have been
heated.

5. Heat the oil pump gear up to 180 to 220 °C (356 to 428 °F). Support end (X) of the shaft (7)
(drive gear). Install oil pump gear (6) onto the shaft. The end of the gear (Z) should be flush
with the end of the shaft (Y) .
6. Install driven gear (4) into the front housing (slip fit).
7. Place gasket (3) and cover (2) in position on the front housing.
Note: Ensure that the old gasket material is removed from the mating surfaces.
8. Install the washer and bolt (1) that secures the cover to the front housing. Tighten bolt (1) to
a torque of 34 ± 5 N·m (25 ± 4 lb ft).
Refer to the Specifications Module, "Engine Oil Pump" for more information on the engine oil
pump.
End By: Install the front housing. Refer to Disassembly and Assembly, " Housing (Front) -
Install".

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Product: EXCAVATOR
i01149671
Water Pump - Remove
SMCS - 1361-011
Removal Procedure
Start By:
A. Remove V-belts. Refer to Disassembly and Assembly, "V-Belts - Remove and Install".
At operating temperature, the engine coolant is hot and under pressure.
Steam can cause personal injury.
Check the coolant level only after the engine has been stopped and the
filler cap is cool enough to touch with the bare hand.
Remove the filler cap slowly to relieve pressure.
Cooling system conditioner contains alkali. Avoid contact with skin and
eyes to prevent personal injury.
NOTICE

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 Tools and Shop
Products Guide" for tools and supplies suitable to collect and contain
fluids on Caterpillar products.
Dispose of all fluids according to local regulations and mandates.
1. Drain the coolant from the cooling system into a suitable container for storage or disposal.
2. Remove four bolts (1) that secure the water pump to the engine.
3. Remove water pump pulley (2) and water pump (3) as an unit from the engine.
4. Remove O-ring (4) (not shown) from water pump (3). Discard the old O-ring.
Wed Oct 2 22:35:05 UTC+0800 2019

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Product: EXCAVATOR
i01566087
Water Pump - Disassemble
SMCS - 1361-015
Disassembly Procedure
Table 1
Required Tools
A 1P-2321 Combination Puller 1
B 1P-1861 Retaining Ring Pliers 1
C 1P-0510 Driver Group 1
Start By:
A. Remove the water pump. Refer to Disassembly and Assembly, "Water Pump - Remove".
NOTICE
Always wear protective gloves when handling parts that have been
heated.
Note: If the water pump is heated up to 80 °C (176 °F), the components can be easily removed.

1. Remove four bolts (1) and the washers that secure the water pump pulley to the water pump.
2. Remove water pump pulley (2) from the water pump.
Note: Check the groove for the V-belt of the water pump pulley for wear and damage. Replace the
water pump pulley, if necessary.
Note: Use Tool (C) during disassembly procedures of the water pump, which require the use of a
press or a hammer.
3. Use Tool (A) to remove flange (3) from the water pump.

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4. Use Tool (B) to remove retaining ring (4) from the water pump.
5. Use a press and Tool (C) to remove shaft assembly (5) from water pump assembly (6) .

6. Remove impeller (8) from the shaft assembly (5) .
Note: Check the impeller for wear, corrosion, and metal to metal contact. Replace the impeller, if
necessary.
7. Remove the following items from shaft (9) :
◦ Bearing (10)
◦ Spacer (11)
◦ Bearing (12)
◦ Washer (13)
8. Once all of the components have been removed, then check shaft (9) for distortion. Replace the shaft,
if necessary.
9. Check seal (14) for wear and damage. Use Tool (C) in order to remove the seal from the water pump
housing, if necessary.
Note: Replace the seal if any signs of leakage occurs during the operation of the water pump.
10. Replace O-ring (7) with a new O-ring.
Wed Oct 2 22:36:01 UTC+0800 2019

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Product: EXCAVATOR
i01566223
Water Pump - Assemble
SMCS - 1361-016
Assembly Procedure
Table 1
Required Tools
A 1P-0510 Driver Group 1
B 1P-1861 Retaining Ring Pliers 1
Note: Refer to Specifications, "Water Pump" for specifications that are required during assembly.

1. Install seal (14), if the seal was removed during the disassembly procedures.
2. The following components are installed on shaft (9) :
◦ Washer (13)
◦ Bearing (12)
◦ Spacer (11)
◦ Bearing (10)
Note: Check two bearings (10) and (12) for correct rotation.

3. Use a press and Tool (A) to install shaft assembly (5) into the water pump housing.
4. Use a press and Tool (A) to install impeller (8) onto shaft assembly (5) .
5. Use Tool (B) to install retaining ring (4) into the water pump housing.
6. Use a press and Tool (A) to install flange (3) onto shaft assembly (5) .

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