Caterpillar 312D2 and 313D2 Excavator 3054C Engine System Pressure- -Release

This article mainly introduces Caterpillar 312D2 and 313D2 excavator 3054C engine System pressure- -release



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Before repairing the hydraulic circuit, the hydraulic pressure in the hydraulic circuit must be released. The pressure of this hydraulic circuit shall be released before disconnecting or removing any hydraulic lines from the following hydraulic circuit.

Arm hydraulic loop

Bucket bar hydraulic loop

Bucket hydraulic loop

Turn the hydraulic circuit

Drive the hydraulic circuit

Attachment Hydraulic circuit (if provided)

Pilot hydraulic circuit

Reflow hydraulic circuit

Note: Refer to the Disassembly and Assembly manual for additional information on the specific hydraulic circuit components.

Hydraulic pressure release for the multiple hydraulic circuits





The pressure of rolling hot oil or hydraulic oil can cause harm to personnel.



After the engine stops, the hydraulic oil pressure will remain in the hydraulic system. Serious injury may occur without prior pressure release prior to repairs to the hydraulic system.

When removing the components or lines of the hydraulic system, ensure that all work tools are lowered to the ground

On, and the hydraulic oil temperature is already cold. Remove it only when the engine is stopped and the filler cap is cooled to freehand touch.



pay attention to

During inspection, maintenance, testing, adjustment and repair, the oil must be performed. Prepare a suitable container to collect fluid before opening any compartment or dismantling any stored parts.

For applicable tools and supplies for collecting and filling the fluid on Cat products, refer to special publications, NENG2500, "Agent Repair Tool Catalogue".

Dispose of all liquids in accordance with local regulations and requirements.
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Follow the following steps to release the hydraulic pressure from multiple hydraulic circuits of the main hydraulic system.

1. Park the machine on the horizontal ground.








2. Fully withdraw the bucket rod cylinder connecting rod. Adjust the bucket position so that the bucket is parallel to the ground. Lower the boom until the bucket falls horizontally on the ground. See the illustration 1.




3. Turn off the engine.

4. Turn the engine start switch to the on position, but not starting the engine.

5. Place the hydraulic start control lever in the unlock position.

6. Move only the joystick or pedal of the repaired hydraulic loop to the full position. This will then release only the high pressure in this hydraulic loop. This will also release any pressure that may exist in the pilot hydraulic circuit.

Note: If the repaired hydraulic circuit needs to start the operating switch, start the corresponding operating switch in the hydraulic circuit.

7. Place the hydraulic start control lever in the locked position.

8. Start the engine.

9. Place the hydraulic start control lever in the unlock position. In this step, do not move any joystick or pedal away from the neutral position. In this step, do not turn in any switches.

10. Move the hydraulic start control lever back to the locking position.

11. Turn off the engine.

12. Repeat steps 4 to step 11 respectively for other hydraulic circuits that require maintenance.

13. After releasing the hydraulic pressure in each target hydraulic loop, place the hydraulic start lever in the locked position.

14. Turn the engine start switch to the off position.

15. Slowly release the filler plug on the hydraulic tank to release the pressure. The fill port plug shall remain loose for at least 45 seconds. This releases the pressure that may be present in the return hydraulic circuit.

16. Tighten the fill port plug on the hydraulic tank to achieve the specified torque.

17. The pressure in the multiple hydraulic circuits requiring repair is now released, and the lines and components can be disconnected or removed from these hydraulic circuits.


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Caterpillar 312D2 and 313D2 Excavator 3054C Engine Disassemble and Assemble

This Article Mainly Introduces Caterpillar 312D2 and 313D2 Excavator 3054C Engine Disassemble and Assemble

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System pressure- -release


SMCS - 4000-553-PX; 4350-553-PX; 5050-553-PX; 6700-553-PX

Steps to release the pressure

Before repairing the hydraulic circuit, the hydraulic pressure in the hydraulic circuit must be released. The pressure of this hydraulic circuit shall be released before disconnecting or removing any hydraulic lines from the following hydraulic circuit.

Arm hydraulic loop

Bucket bar hydraulic loop

Bucket hydraulic loop

Turn the hydraulic circuit

Drive the hydraulic circuit

Attachment Hydraulic circuit (if provided)

Pilot hydraulic circuit

Reflow hydraulic circuit

Note: Refer to the Disassembly and Assembly manual for additional information on the specific hydraulic circuit components.

Hydraulic pressure release for the multiple hydraulic circuits

The pressure of rolling hot oil or hydraulic oil can cause harm to personnel.


After the engine stops, the hydraulic oil pressure will remain in the hydraulic system. Serious injury may occur without prior pressure release prior to repairs to the hydraulic system.

When removing the components or lines of the hydraulic system, ensure that all work tools are lowered to the ground

On, and the hydraulic oil temperature is already cold. Remove it only when the engine is stopped and the filler cap is cooled to freehand touch.


pay attention to

During inspection, maintenance, testing, adjustment and repair, the oil must be performed. Prepare a suitable container to collect fluid before opening any compartment or dismantling any stored parts.

For applicable tools and supplies for collecting and filling the fluid on Cat products, refer to special publications, NENG2500, "Agent Repair Tool Catalogue".

Dispose of all liquids in accordance with local regulations and requirements.


Follow the following steps to release the hydraulic pressure from multiple hydraulic circuits of the main hydraulic system.

1. Park the machine on the horizontal ground.

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2. Fully withdraw the bucket rod cylinder connecting rod. Adjust the bucket position so that the bucket is parallel to the ground. Lower the boom until the bucket falls horizontally on the ground. See the illustration 1.

3. Turn off the engine.

4. Turn the engine start switch to the on position, but not starting the engine.

5. Place the hydraulic start control lever in the unlock position.

6. Move only the joystick or pedal of the repaired hydraulic loop to the full position. This will then release only the high pressure in this hydraulic loop. This will also release any pressure that may exist in the pilot hydraulic circuit.

Note: If the repaired hydraulic circuit needs to start the operating switch, start the corresponding operating switch in the hydraulic circuit.

7. Place the hydraulic start control lever in the locked position.

8. Start the engine.

9. Place the hydraulic start control lever in the unlock position. In this step, do not move any joystick or pedal away from the neutral position. In this step, do not turn in any switches.

10. Move the hydraulic start control lever back to the locking position.

11. Turn off the engine.

12. Repeat steps 4 to step 11 respectively for other hydraulic circuits that require maintenance.

13. After releasing the hydraulic pressure in each target hydraulic loop, place the hydraulic start lever in the locked position.

14. Turn the engine start switch to the off position.

15. Slowly release the filler plug on the hydraulic tank to release the pressure. The fill port plug shall remain loose for at least 45 seconds. This releases the pressure that may be present in the return hydraulic circuit.

16. Tighten the fill port plug on the hydraulic tank to achieve the specified torque.

17. The pressure in the multiple hydraulic circuits requiring repair is now released, and the lines and components can be disconnected or removed from these hydraulic circuits.

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Disassembly of the Crankshaft of Caterpillar C3.4B Engine of Construction Machinery

This article describes the disassembly of the crankshaft of a Caterpillar C3.4B engine for construction machinery

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Removing steps





begin:

A. Remove the engine oil suction pipe. For the correct steps, see Disassembly and Assembly, "Engine Oil pan-Removing and Installation".

B. Balancer, remove, if necessary. For the correct steps, see Disassembly and Assembly, "Balancer-Removing". C. Remove the flywheel housing. See Disassembly and Assembly, "flywheel housing-Removing and installing" for the correct steps.

D. Remove the front shell. For the correct steps, see Disassembly and assembly, "Housing (front) -Disassembly".

E . If necessary, remove the power output unit to drive. See Disassembly and Assembly, "Power Output Drive-Remove and Install" for the correct steps.

F. Remove the cylinder head, if necessary. See Disassembly and Assembly, "Cylinder head-Remove" for the correct procedures.

G. If necessary, remove the piston and link. See Disassembly and Assembly, "Pistons and Linkage-Removing" for the correct steps.

H. Remove the main bearing cover. See Disassembly and Assembly, "Crankshaft Main Bearing-Removing and Installation" for the correct steps.


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pay attention to

Keep all the parts clean without impurities.

Impurities can cause rapid wear and shorten component life.



1. The engine shall be mounted inverted on a suitable bench.

2. If the cylinder head, piston, and connecting rod are not removed, remove the connecting rod bearing. For the correct steps, see Disassembly and Assembly, "Connecting rod Bearing-Removing".

3. Connect the tool (A) and the appropriate lifting equipment to the crankshaft (2). Lift the crankshaft out of the cylinder block. The crankshaft weighs approximately 35 kg (77 Ib).

Note: Do not damage any finishing surface on the crankshaft. After removing the crankshaft from the engine, the crankshaft must be supported on the proper bench to avoid damage to the crankshaft timing.

4. Remove the main bearing bearing from the cylinder block. See Disassembly and Assembly, "Crankshaft Main Bearing-Removing and Installation" for the correct steps.

Note: The main bearing shaft has a groove and one oil bore.

5. If necessary, remove the crankshaft timing tooth ring (1). For the correct steps, see Disassembly and Assembly, "Crankshaft timing tooth ring-Removing and installing."
pay attention to 

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Caterpillar 311F LRR- JFT Crawler Excavator Engine Crankshaft main bearing –Installation

this article mainly introduces Caterpillar 311F LRR- JFT Crawler Excavator Engine Crankshaft main bearing –Installation



Installation steps



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pay attention to

This procedure must only be used for the removal and installation of the main bearing bearing bush while the crankshaft is in place.

The removal steps and installation steps for each pair of main bearing tiles must be completed before removing the next pair of main bearing tiles.


pay attention to


1. Ensure that the main bearing bearings are clean and free from wear or damage. Replace the main bearing bearing bush if necessary.

Note: If the main bearing bush is replaced, check if the larger main bearing bush is previously installed. If the thrust washer is replaced, check if the enlarged thrust washer has been previously installed.

2. Clean the shaft collar of the crankshaft. Check the crankshaft collar for damage. Replace the crankshaft or repair it, if necessary.








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3. For the No.3 main bearing, ensure that the two thrust washers (4) are clean and free from wear or damage. Replace the stop washer if necessary. Lubricate the thrust washer with a clean engine oil (4).

Note: There is a groove and oil hole.
4. Lubricate the crankshaft journal and main bearing upper shaft bush with clean engine oil (8). Curthe main bearing upper bush (8)
Slide in place between the shaft journal and the cylinder block. Ensure that the shaft socket on the main bearing is properly seated into the groove of the cylinder block.








5. Install the main bearing lower bearing bush (3) into the main bearing cap (2). Ensure that the projection of the main bearing is positioned seated into the groove of the bearing cover.

Note: The lower bush of the main bearing is a common bush without oil holes.

6. Lubricate the crankshaft journal and main bearing underaxle bush with clean engine oil. Install the main bearing cap (5) into the cylinder block.

Note: Make sure that the main bearing cap is oriented correctly. The positioning of the upper and lower tiles shall be on the same side of the engine.

7. Lubricate the threads of the bolts (4) with a clean engine oil. Lubricate the end bottom surface of the bolt (4) with a clean engine oil.

8. Install the bolts (4) into the main bearing cap (5). Tighten the bolts evenly to pull the cover (5) in place. Ensure that the bearing cap is seated properly,

Note: Do not tap the main bearing cap in place, otherwise the bearing bush may be squeezed out.

9. Tighten the bolts (4) to an initial torque of 50 N-m (37 Ibft).

10. Tighten the bolts (4) to a torque of 80 N·m (591 bft).

Use tool (B) to turn the bolts an additional 90 degrees clockwise to achieve the correct final torque.


11. Check the axial clearance of the crankshaft. Using the tool (C), measure the crankshaft axial clearance. See Skills for the correct information

Surgical Specifications, "Crankshaft".

12. Remove the tool (C)

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End By:


a. Install the balancer, if necessary. For the correct steps, see Disassembly and Assembly, "Balancer-Install".

b. Install oil pipe and engine oil pan. For the correct steps, see Disassembly and Assembly, "Engine Oil pan-Removing and Installation".

Caterpillar 311F LRR- JFT Crawler Excavator Engine Crankshaft Main Bearing – Removal

this article mainly introduces Caterpillar 311F LRR- JFT Crawler Excavator Engine Crankshaft main bearing – removal

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Removing steps





(1) The tool is used in the hole of the electric starting motor.



begin:

A . Remove the engine oil sump and the oil suction pipe. For the correct steps, see Disassembly and Assembly, "Engine Oil pan-Removing and Installation".

B . Balancer, remove, if necessary. For the correct steps, see Disassembly and Assembly, "Balancer-Remove".



pay attention to

This procedure must only be used for the removal and installation of the main bearing bearing bush while the crankshaft is in place.


Disassembly of each pair of main bearing tiles must be completed before removing the next pair of main bearing tiles

Steps and installation steps.


pay attention to


Keep all the parts clean without impurities.

Impurities can cause rapid wear and shorten component life.



1. Make sure that the correct position and orientation of the main bearing cover are indicated.

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2. Remove the bolts (1) and remove the main bearing cover (2) from the cylinder block.






3. Remove the main bearing lower bearing bush (3) from the main bearing cap (2). Keep the main bearing bearing bush integrated with the main bearing cover.

Note: The lower bush of the main bearing is a common bush without oil holes.












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4. Use the appropriate tool to push the main bearing from opposite the convex tongue (5). Use tool (A) to rotate the crankshaft while push the bearing bush. Remove the main bearing upper bearing bush (5) from the cylinder block. Keep the shaft tiles integrated. The


thrust washer (4) is attached to the upper shaft tile of the no. 3 main bearing to record the orientation of the thrust washer for easy installation.

Caterpillar 311F LRR- JFT Crawler Excavator Engine Housing (front)-Remove

this article mainly introduces Caterpillar 311F LRR- JFT Crawler Excavator Engine Housing (front)-Remove


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Installation steps







pay attention to

Keep all the parts clean without impurities.

Impurities can cause rapid wear and shorten the service life of the components.



1. Ensure that all parts are clean and free from wear or damage. If necessary, replace all worn or damaged parts.







2. For engines with any accessory drive, if a new front housing is being installed, the plug (7) in position (Y) will be removed to maintain the lubrication of the accessory drive.

3. If removed but no longer installing the accessory driver, the oil channel in position (Y) must be plugged. Follow Step 3.a to

3.c, to keep the engine oil circulating.

a. Apply the tool (C) to the screw plug (7).

b . Install the plug (7) into the front housing (1).

c. Screw the plug (7) to a torque of 15N-m (133 lb in)
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4. Thoroughly clean the sealing cushion surface of the front housing (1) and the cylinder block.

5. If necessary, install the positioning pin (6) (not shown) onto the cylinder block.

6. Install the tool (B) to the position on the cylinder block (X).

7. Apply a thin layer of 3mm tool (A) onto the front housing (1), as shown in Figure 3.

8. Install the front housing (1) on tool (B) and positioning pin (6) (not shown).

9. Apply the tool (C) to the thread of the bolt (5).

10. Install the bolts (5) where available in the front housing (1) and tighten by hand.

11. Remove the tool (B) from the cylinder block.

12. Install the remaining bolts (5). Tighten the bolts to 25 N·m (221 lb in) in the order shown in Figure 5.

13. Install the camshaft gear. For the correct steps, see Disassembly and Assembly, "Camshaft gear-installation".

14. Install the fuel injection pump. See Disassembly and Assembly, "Fuel Fuel Pump-Installation" for the correct steps.

15. Install the engine oil pan. For the correct steps, see Disassembly and Assembly, "Engine oil pan-Removing".

16. Install accessory drives if necessary. For the correct steps, see Disassembly and Assembly, "Accessory Drive-Removing and installing".





17. If necessary, follow steps 17.a to 17. For c, to install the engine oil filler port (2).

a. Install the new O-ring seal (4) (not shown) on the engine oil fill port (2).

b. Install the engine oil fill port (2) on the front housing (1).

c. Install the bolts (3) into the engine oil fill port (2). Tighten the bolts to a torque of 25N-m (2211b in).







18. Install the cover plate (8) onto the front housing, if necessary. Follow steps 18.a to Step 18. And c to install the cover plate.

a. Install the new O-ring seal (10) onto the cover plate (8). Apply the tool (D) onto the O-ring seal (10).

b. Install the cover plate (8) on the front housing.

c. Install the bolts (9) to the cover plate and tighten the bolts to a torque of 25N-m (2211b in).

19. Install the fan drive device, if necessary. For the correct steps, see Disassembly and Assembly, "Fan Drive Removing and Installation".

End By: Fill the coolant to the cooling system. Refer to the Operation and Maintenance Manual, "Cooling System Coolant-Fill" for the correct procedures.
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Caterpillar 311F LRR- JFT Crawler Excavator Engine Housing (front)Remove

this article mainly introduces Caterpillar 311F LRR- JFT Crawler Excavator Engine Housing (front)Remove


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Removing steps


A . Remove the engine oil sump. For correct steps, see Disassembly and Assembly, " Engine Oil pan-Removing and Installation.

B . Remove the camshaft gear. See Disassembly and assembly, "Camshaft gear-Removing and installing" for the correct procedure. C . Remove the fuel injection pump. For the correct steps, refer to Disassembly and Assembly, "Fuel injection pump-Remove".


pay attention to

Keep all the parts clean without impurities.

Impurities can cause rapid wear and shorten the service life of the components.



pay attention to

When inspecting, maintaining, testing, adjusting and repairing products, be careful to ensure that the liquid is held in the container. Before opening any chamber or disassembling any part with stored storage.

Dispose of all liquids in accordance with local regulations and instructions.


1. Remove the fan drive device, if necessary. For the correct steps, see Disassembly and Assembly, "Fan Drive Removing and Installation".
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2. Remove the bolts (5) from the front housing (1).

Note: Record the position of bolts of different lengths for easy installation.

3. Remove the front housing (1) from the cylinder block and the positioning pin (6) (not shown).

4. Positioning pin (6) should be removed only if damage (not shown).

5. If necessary, follow steps 5.a to 5.c to remove the engine oil filler port








a. Remove the bolt (3) from the engine oil filler port (2).

b. Remove the engine oil fill port (2) from the front housing (1).

c. Remove the O-ring seal (4) (not shown).

6. If necessary, follow steps 6.a to 6c to remove the cover plate (8)
from the front housing.
a. Remove the bolt (9) from the cover plate (8).
b. Remove the cover plate (8) from the front housing (1).
c. Remove the O-ring seal (10) from the cover plate.

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7. If necessary, remove the plug (7) from the position of the front shell (Y).