Caterpillar cat 312 b excavator (prefix 8jr) service repair manual (8jr00001 and up)

Service Repair Manual
Models
312B and 312B L Excavator

Shutdown SIS
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Product: EXCAVATOR
Model: 312B L EXCAVATOR 8JR
Configuration: 312B & 312B L TRACK-TYPE EXCAVATORS 8JR00001-UP (MACHINE) POWERED BY 3064 ENGINE
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
i01146555
Engine Oil Pump - Install
SMCS - 1304-012
Installation Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 1P-0510 Driver Group 1
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
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312B & 312B L TRACK-TYPE EXCAVATORS 8JR00001-UP (MACHINE) POWE...
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Illustration 1 g00646132
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.
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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.
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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
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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 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.
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Mon Jun 22 22:02:27 UTC+0800 2020
2/2
2020/6/22

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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
heated.
Note: If the water pump is heated up to 80 °C (176 °F), the components can be easily removed.
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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) .
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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.
Mon Jun 22 22:03:26 UTC+0800 2020
4/4
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Shutdown SIS
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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.
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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.
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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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7. Install water pump pulley (2) onto the flange.
8. Install four bolts (1) in order to secure water pump pulley (2) to the flange.
End By: Install the water pump. Refer to Disassembly and Assembly, "Water Pump - Install".
Mon Jun 22 22:04:26 UTC+0800 2020
4/4
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Product: EXCAVATOR
i01149732
Water Pump - Install
SMCS - 1361-012
NOTICE
1. Replace O-ring (4) (not shown) with a new part. Apply glycerine to the O-ring before the
installation of the water pump (3) and water pump pulley (2) .
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2. Install the water pump (3) and water pump pulley (2) as a unit onto the engine.
Note: When the water pump is installed, ensure that the grease fitting is up. Also, ensure
that the weep hole is down.
3. Install bolts (1) in order to secure water pump (3) to the cylinder block.
4. Fill the cooling system to the correct level. Refer to the appropriate Operation and
Maintenance Manual for the correct fluid and the correct filling procedure.
End By: Install V-belts. Refer to Disassembly and Assembly, "V-Belts - Remove and Install".
Mon Jun 22 22:05:25 UTC+0800 2020
2/2
2020/6/22

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Product: EXCAVATOR
i01148678
Water Temperature Regulator - Remove and Install
SMCS - 1355-010
Removal Procedure
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
1/4
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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 level below the water temperature regulator.
2. Loosen hose clamp (1) and disconnect hose (2) from cover (4) of the water temperature
regulator.
3. Remove two bolts (3) and the washers from cover (4) of the water temperature regulator.
4. Separate cover (4) from elbow (5) .
5. Remove bolts (6). Separate elbow (5) from the water outlet manifold.
6. Remove water temperature regulator (8) (not shown) from cover (4) .
7. Remove gasket (7) (not shown) and gasket (9) (not shown) from the mounting surfaces of
cover (4) and elbow (5) .
8. Use the following procedure in order to test the water temperature regulator:
a. Put the water temperature regulator in a tub of water. Heat the water in order to test
the water temperature regulator for thermostatic action.
Note: Stir the water in the tub in order to maintain even temperature during the test.
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b. When the valve of the water temperature regulator lifts more than 10 mm (0.4 inch),
measure the water temperature.
Note: The opening temperature for the water temperature regulator is 71° ± 2°C (160°
± 3.6°F).
c. If the valve fails to operate properly, replace the water temperature regulator.
NOTICE
1. Clean all of the mounting surfaces for the gaskets and remove all gasket material.
NOTICE
If the water temperature regulator is installed incorrectly, it will cause
the engine to overheat.
2. Install water temperature regulator (8) (not shown) into elbow (5) .
Note: When the water temperature regulator is installed, ensure that the hole for the air vent
is up.
3. Install gasket (7) (not shown) and gasket (9) (not shown).
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Note: Check the condition of the gaskets. If the gaskets are worn or damaged, use 8T-9013
Silicone Sealant for replacement.
4. Install the bolts (6) in order to secure elbow (5) to the water outlet manifold.
5. Install cover (4) for the water regulator housing.
6. Install the washers and two bolts (3) in order to secure cover (4) of the water regulator
housing.
7. Reconnect hose (2) and tighten hose clamp (1) onto cover (4) of the water regulator
housing.
8. Fill the cooling system to the correct level. Refer to the Operation and Maintenance Manual
for the correct fluid and the correct filling procedure.
Mon Jun 22 22:06:24 UTC+0800 2020
4/4
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Shutdown SIS
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Product: EXCAVATOR
i01567208
Flywheel - Remove
SMCS - 1156-011
Removal Procedure
Table 1
Required Tools
A 138-7575 Link Bracket 1
B Forcing screws M16 X 2 2
NOTICE
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1. Remove twelve bolts (1) and washers from the adapter (2) .
2. Remove the adapter (2) from the flywheel housing.
3. Remove four socket head bolts (3) from the inner ring (4) .
4. Remove the inner ring (4) from the flywheel.
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5. Remove six bolts (5) that secure flywheel (6) to the crankshaft. Check all bolts for stripped
threads. Replace the bolts, if necessary.
6. Install Tool (A), a strap, and a suitable lifting device onto the flywheel (6).
7. Use Tool (B) in order to remove the flywheel and ring gear out of the housing. The weight
of the flywheel is 50 kg (110 lb).
8. Perform the following procedure in order to remove the flywheel ring gear.
a. Place the flywheel and ring gear assembly on a suitable support.
Note: Check the flywheel ring gear for the following conditions:cracks, damaged
dowel holes, worn ring gear and damaged ring gear.
Note: Identify the orientation of the old ring gear on the flywheel for proper
positioning, when the new ring gear is installed.
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heated.
b. Heat ring gear (7) uniformly.
c. Remove the ring gear (7) by tapping the ring gear all the way around the flywheel
(6) .
d. Reposition the flywheel in order to remove the ring gear.
Mon Jun 22 22:07:24 UTC+0800 2020
4/4
2020/6/22

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Product: EXCAVATOR
i01567260
Flywheel - Install
SMCS - 1156-012
Table 1
Required Tools
A 138-7575 Link Bracket 1
NOTICE
heated.
1. Perform the following procedure, if the ring gear was removed from the flywheel:
a. Heat the ring gear to 150 °C (302 °F) in an oven.
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b. Press the ring gear onto the flywheel.
Note: Prior to the installation of the flywheel, refer to Specifications, "Flywheel" for
information on checking the flywheel assembly for flatness.
2. Install Tool (A), a strap, and a suitable lifting device onto flywheel (6) .
3. Install flywheel (6). The weight of the flywheel is 50 kg (110 lb).
4. Install six bolts (5) in order to secure flywheel (6) onto the crankshaft. Tighten the bolts to a
torque of 83 ± 5 N·m (61 ± 4 lb ft).
5. Remove Tool (A) from the flywheel.
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Caterpillar cat 312 b excavator (prefix 8jr) service repair manual (8jr00001 and up)

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