Caterpillar Cat 312C Excavator (Prefix DBN) Service Repair Manual (DBN00001 and up).pdf

Service Repair Manual
Models
312C and 312C L Excavator

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Product: EXCAVATOR
Model: 312C EXCAVATOR DBN
Configuration: 312C & 312C L Excavators DBN00001-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
i01565175
Fuel Injection Pump - Remove
SMCS - 1251-011
Removal Procedure
Table 1
Required Tools
Tool Part Number Part Description Qty
A 9U-6124 Universal Metric Socket Set 1
B 9U-6128 Universal Metric Socket (1)
1
( 1 )
Part of the Universal Metric Socket Set
Start By:
A. Remove the fuel injection lines. Refer to Disassembly and Assembly, "Fuel Injection Lines
- Remove and Install".
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.
NOTICE
Care must be taken to ensure that fluids are contained during
performance of inspection, maintenance, testing, adjusting and repair
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312C & 312C L Excavators DBN00001-UP (MACHINE) POWERED BY 3064 Engin...
2020/5/12
https://127.0.0.1/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sis...

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. Ensure that the engine is the top center position on number one piston. Refer to Testing and
Adjusting, "Finding Center Position for No. 1 Piston".
Illustration 1 g00813442
2. Remove bolts (1) and washers that secure the cover (2) to the engine front housing.
3. Remove the access cover. Note the timing marks on the fuel injection pump drive gear and
the idler gear for later installation.
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4. Scribe a line across the front plate (3) and the mounting flange for the fuel injection pump
(4). This ensures proper alignment for the installation of fuel injection pump (8) .
5. Loosen fitting (5) for oil line (6) .
6. Remove oil line (6) from nipple (7) (not shown).
Note: Put caps or plugs on all openings immediately in order to prevent contamination.
7. Use a lifting sling and a hoist in order to secure the fuel injection pump. The weight of the
fuel injection pump is 13 kg (29 lb).
Note: Use Tool (B) to remove the bolts and the washers that mount the fuel injection pump
(8) .
8. Remove bolt (9) and the washer from the cylinder block.
9. Remove four bolts (10) and the washers that secure the fuel injection pump to the front
housing.
10. Remove the fuel injection pump (8). The gear and the mounting flange will remain with the
fuel injection pump.
Note: The fuel injection pump must be mounted to the engine in order to loosen the nut for
the drive gear.
Note: Do not rotate the engine after the fuel injection pump is removed.
11. Ensure that the old gasket material is removed from all mating surfaces of the pump
mounting flange and the face of the fuel injection pump flange.
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Tue May 12 22:14:12 UTC+0800 2020
3/3
2020/5/12

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Product: EXCAVATOR
i01565619
Fuel Injection Pump - Install
SMCS - 1251-012
Installation Procedure
Table 1
Required Tools
Tool Part number Part Description Qty
A 9U-6124 Universal Metric Socket Set 1
B 9U-6128 Universal Metric Socket (1)
1
( 1 )
Part of the Universal Metric Socket Set
NOTICE
Note: If the nut for the fuel injection pump drive gear is removed, you must tighten the nut
for the fuel injection pump drive gear to 88 ± 5 N·m (65 ± 4 lb ft).
1/2
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1. Use a lifting sling and a hoist in order to secure the fuel injection pump (8). The weight of
the fuel injection pump is 13 kg (29 lb).
2. Install a new gasket and install fuel injection pump (8) .
3. Ensure that the engine is in the top center position on No. 1 piston. Refer to Testing and
Adjusting, "Finding Top Center Position for No. 1 Piston".
4. Ensure that the mark on the front plate (3) and the mark on the fuel injection pump flange
(4) are aligned.
Refer to Testing and Adjusting, "Fuel Injection Timing-Check" for more information on
fuel injection pump timing.
Note: Use Tool (B) to install the bolts and washers that secure the fuel injection pump to the
cylinder block.
5. Install the washers and bolts (9) that secure the fuel injection pump to the engine cylinder
block.
6. Remove the sling from the fuel injection pump.
7. Connect oil line (6) to nipple (7) (not shown).
8. Tighten fitting (5) for oil line (6) .
Tue May 12 22:15:12 UTC+0800 2020
2/2
2020/5/12

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Product: EXCAVATOR
i01564499
Turbocharger - Remove
SMCS - 1052-011
Removal Procedure
NOTICE
NOTICE
containing fluids.
1/3
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1. Loosen the hose clamp (1) on hose (2) .
2. Remove hose (2) from the turbocharger (3) .
3. Disconnect oil supply line (4) from the cylinder block.
4. Loosen two clamps (5) on hose (7) .
5. Slide hose (7) off fitting (8) onto oil return line (6) .
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6. Remove eight nuts (9) from the studs on the exhaust manifold.
Note: The four studs have two nuts for a total of eight nuts.
7. Remove turbocharger (3), oil supply line (4), and oil return line (6) as an unit.
8. Remove metal gasket (10) (not shown). Check the gasket for wear or damage. Replace the
gasket, if necessary.
Tue May 12 22:16:11 UTC+0800 2020
3/3
2020/5/12

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Product: EXCAVATOR
i01615171
Turbocharger - Disassemble
SMCS - 1052-015
Disassembly Procedure
Start By:
A. Remove the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove".
NOTICE
NOTICE
containing fluids.
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1. Place an index mark on all of the components. The marks will help to align the components
during the assembly procedure.
2. Remove two bolts (1) from the oil return line. Remove bolt (2) from the oil supply line.
3. Remove oil return line (3) from the cartridge.
4. Remove oil supply line (4) from the cartridge.
5. Remove gasket (5) from the cartridge.
6. Remove gasket (6) from the turbine housing.
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7. Remove the bolt and nut (7) from clamp (8). Remove clamp (8) that secures the turbine
housing (9) to the cartridge (10) .
8. Separate turbine housing (9) from the cartridge (10) .
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9. Remove snap ring (11) from compressor housing (12) .
10. Separate compressor housing (12) from the cartridge (10) .
Tue May 12 22:17:10 UTC+0800 2020
4/4
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Product: EXCAVATOR
i01147762
Turbocharger - Assemble
SMCS - 1052-016
Assembly Procedure
NOTICE
Note: During the assembly procedure, ensure that the index marks are aligned when the
components are assembled.
1/3
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1. Install cartridge (10) into compressor housing (12) .
2. Install snap ring (11) into compressor housing (12) .
3. Install cartridge (10) into turbine housing (9) .
4. Install clamp (8) that secures cartridge (10) and turbine housing (9) together. Install the bolt
and nut (7) into clamp (8).
Note: Refer to the Specifications Module, "Turbocharger" for information on the clamp.
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5. Inspect the condition of the gaskets. Replace the gaskets, if necessary.
6. Install gasket (6) on the turbine housing.
7. Install gasket (5) on the cartridge.
8. Place oil supply line (4) in position. Secure the oil supply line with bolt (2) (not shown).
9. Place oil return line (3) in position. Secure the oil return line with two bolts (1) .
End By: Install the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Install".
Tue May 12 22:18:09 UTC+0800 2020
3/3
2020/5/12

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Product: EXCAVATOR
i01564587
Turbocharger - Install
SMCS - 1052-012
NOTICE
1. Inspect the condition of all gaskets. Replace the gaskets, if necessary.
1/2
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2. Install metal gasket (10) (not shown). Install turbocharger (3), oil supply line (4) and oil
return line (6) (not shown) as a unit.
3. Install eight nuts (9). Tighten the nuts to a torque of 41 N·m (30 lb ft).
Note: Two nuts are installed on each turbocharger mounting stud.
4. Slide hose (7) down the oil return line (6) onto fitting (8) .
5. Tighten two clamps (5) on hose (7) .
6. Connect oil supply line (4) to the cylinder block.
Tue May 12 22:19:09 UTC+0800 2020
2/2
2020/5/12

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Product: EXCAVATOR
i01565722
Exhaust Manifold - Remove and Install
SMCS - 1059-010
Removal Procedure
Start By:
A. Remove the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Remove".
NOTICE
1/3
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1. Remove the nuts (1) and washers that secure the exhaust manifold to the cylinder head
assembly. The 3066 Engine has twelve nuts and washers while the 3064 Engine has eight
nuts and washers.
2. Remove exhaust manifold (2) from the cylinder head assembly.
3. Remove exhaust manifold gasket (3) that is located between exhaust manifold (2) and the
cylinder head assembly.
Note: The 3066 Engine has two exhaust manifold gaskets, while the 3064 Engine has one
exhaust manifold gasket.
NOTICE
1. Install exhaust manifold gasket (3) between exhaust manifold (2) and the cylinder head
assembly.
Note: The 3066 Engine has two exhaust manifold gaskets, while the 3064 Engine has one
exhaust manifold gasket.
2. Place exhaust manifold (2) in position on the cylinder head.
3. Install the nuts (1) and the washers that secure the exhaust manifold to the cylinder head
assembly. The 3066 Engine has twelve nuts and washers while the 3064 Engine has eight
nuts and washers.
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4. Tighten exhaust manifold nuts (1) to a torque of 18 ± 4 N·m (13 ± 3 lb ft).
End By: Install the turbocharger. Refer to Disassembly and Assembly, "Turbocharger - Install".
Tue May 12 22:20:08 UTC+0800 2020
3/3
2020/5/12

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Product: EXCAVATOR
i01615211
Air Inlet Heater - Remove and Install
SMCS - 1090-010
Removal Procedure
NOTICE
1. Loosen hose clamp (1) that secures air inlet hose (2) to air inlet elbow (4) .
2. Disconnect air inlet hose (2) from air inlet elbow (4) .
1/3
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3. Remove four bolts (3) and washers that secure the following items to the air inlet manifold:
air inlet elbow (4), gasket (5), air inlet heater (6) and gasket (7) .
4. Remove the following items from the air inlet manifold: air inlet elbow (4), gasket (5), air
inlet heater (6) and gasket (7) .
Note: Check the condition of the gaskets that are used between the elbow and the air inlet
heater. Check the gaskets between the air inlet heater and the air inlet manifold. If the
gaskets are damaged in any way, replace the gaskets.
NOTICE
2/3
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Note: Check condition of the gaskets for the air inlet elbow and the air inlet heater. If the
gaskets are damaged, use a new part for replacement. The wire mesh gasket (7) is installed
between the air inlet manifold and the air inlet heater.
1. Place the following items in position on the air inlet manifold: gasket (7), the air inlet heater
(6), gasket (5) and the air inlet elbow (4) .
2. Install four bolts (3) that secure the following items to the air inlet manifold: gasket (7), the
air inlet heater (6), gasket (5) and the air inlet elbow (4)
Tighten bolts (3) to a torque of 28 ± 7 N·m (21 ± 5 lb ft).
3. Connect air inlet hose (2) to air inlet elbow (4) .
4. Tighten hose clamp (1) that secures the air inlet hose to the air inlet elbow.
Tue May 12 22:21:08 UTC+0800 2020
3/3
2020/5/12

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Product: EXCAVATOR
i01575215
Inlet Manifold - Remove
SMCS - 1058-011
Removal Procedure
Start By:
A. Remove fuel filter base. Refer to Disassembly and Assembly, "Fuel Filter Base - Remove
and Install".
B. Remove fuel injection lines. Refer to Disassembly and Assembly, "Fuel Injection Lines -
Remove and Install".
C. Remove the air inlet heater. Refer to Disassembly and Assembly, "Air Inlet Heater -
Remove and Install".
NOTICE
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2020/5/12

Caterpillar Cat 312C Excavator (Prefix DBN) Service Repair Manual (DBN00001 and up).pdf

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