the hydraulic release of the single hydraulic circuit of the caterpillar311D LRR excavator

This article introduces the hydraulic release of the single hydraulic circuit of the caterpillar311D LRR excavator

                                                       warn！

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

personnel.

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After the engine shutdown, 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 machines are lowered to the

ground and that the hydraulic oil temperature is cold. Remove

it only when the engine is stopped and the filler cap is

cooled to manual touch. 

 

pay attention to

During inspection, maintenance, testing, adjusting and

servicing the engine. Prepare a suitable container for

fluid collection before opening or dismantling any stored

parts.

For tools and supplies suitable for the collection and

delivery of liquids on Caterpillar products, see Special

publications, NENG 2500, "Caterpillar Agents Tools

Catalogue."

Dispose of all liquids in accordance with local regulations and

regulations.

Follow the following steps to release the hydraulic pressure from the single

hydraulic circuit 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 only release only the high pressure in this

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

 

9. Slowly release the filling port plug on the hydraulic tank to release

the pressure on the hydraulic tank. 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. 

 

10. Tighten the filling plug on the hydraulic tank to the specified torque. 

 

11. The pressure in the single hydraulic circuit requiring repair is now 

 

released and the lines and components can be disconnected or removed from

the hydraulic circuit.

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JCB Backhoe Loader Power Shift - Chain Adjustment

This article describes JCB Backhoe Loader Power Side Shift - Chain Adjustment


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The chain tension should be checked at the initial 100 hours
service and every 500 hours.
Check and Adjust
1
Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the loader arms to the ground.
2
Position the carriage centrally and rest the bucket on
the ground, remove the starter key.
3
Check the chain tension which should be 5 to 10mm
(0.19 to 0.39in) deflection A at the mid point. The
tension should be equal for all chains.
4
If adjustment is required, slacken locknuts C and adjust
on nuts B as required, tighten locknuts C on
completion.
5
Repeat steps 3 and 4 for the opposite pair of chains.
Note: When there is no thread left for adjustment fit new
chains.
6
Operate the carriage side to side several times and
recheck the deflection.










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Removal
1
Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the loader arms to the ground.
2
Position the carriage centrally and rest the bucket on
the ground, remove the starter key.
3
Undo and remove nuts B.
4
Remove split pins D and pin E.
5
Withdraw chains from the machine.
Assembly
1
Thread the chains around the pulley and secure to the
carriage with pin E, fit new split pins D.
2
Connect chain adjusters, tension chains as required,
see Check and Adjust.
Power Sideshift - Chain Adjustment
The chain tension should be checked at the initial 100 hours
service and every 500 hours.
Check and Adjust
1
Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the loader arms to the ground.
2
Position the carriage centrally and rest the bucket on
the ground, remove the starter key.
3
Check the chain tension which should be 5 to 10mm
(0.19 to 0.39in) deflection A at the mid point. The
tension should be equal for all chains.
4
If adjustment is required, slacken locknuts C and adjust
on nuts B as required, tighten locknuts C on
completion.
5
Repeat steps 3 and 4 for the opposite pair of chains.
Note: When there is no thread left for adjustment fit 

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Perkins 2806F Engine Inlet and Exhaust Valve Springs - Remove and Install

This article introduces Perkins 2806F Engine Inlet and Exhaust Valve Springs - Remove and Install



Removal Procedure




Start By: a. Remove the electronic unit injectors. Refer to Disassembly and Assembly, "Electronic Unit Injector -Remove"for the correct procedure.

NOTICE：
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened component life.

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NOTICE：

Note: Valve springs must be replaced in pairs for the inlet valves or the exhaust valves of each cylinder. If all valve springs require replacement the procedure can be carried out on two cylinders at the same time.
The procedure can be carried out on the following pairs of cylinders. 1 with 6, 2 with 5 and 3 with 4.
Ensure that all the valve springs are installed beforechanging from one pair of cylinders to another pair of cylinders

Personal injury can result from being struck by parts propelled by a released spring force.
Make sure to wear all necessary protective equipment.
Follow the recommended procedure and use all recommended tooling to release the spring force.









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2. Install Tooling (B) into the electronic unit injector sleeve. Secure Tooling (B) with unit injector clamp
(1) (not shown).
3. Tighten the nut of Tooling (B) until valve keepers
(3) are released from valve rotators (4).
Note: Ensure that valve stem seals (7) are not damaged.
4. Remove valve keepers (3) from valve rotators (4).

5. Loosen the nut to release the pressure on Tooling
(B). Remove unit injector clamp (1) (not shown).
Carefully remove Tooling (B).
6. Remove valve rotators (4) from valves (2).
7. Remove outer valve springs (6) and inner valve springs (5).
8. Remove washers (8) from the valve guide.
9. If necessary, repeat Step 1 through Step 8 toremove remaining the inlet and the exhaust valve springs.

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JCB Backhoe Loader Power Sideshift - Wear Pad Renewal

This article mainly introduces JCB Backhoe Loader Power Sideshift - Wear Pad Renewal

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Inspection (1000 hours)


When the wear pads are worn to 6 mm (0.23 in) or below  they should be replaced.
It is permissible to rotate the top wear pads 180° to prolong  service life, provided the contact surface is more than 6 mm  (0.23 in) thick. 

Note: If rotating the wear pad the grease nipples will have to  be swopped over.  Dismantling
1
Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the loader arms to the ground. 

2
Set the carriage fully to end of travel A, shown in centre  position for clarity. 

3
Lower the bucket to take the weight off the kingpost. 

4
Switch OFF the engine and remove the starter key,  operate the control levers to vent residual hydraulic  pressure. 

5
Unlock top lock tab B and unscrew nut C. 

6
Remove bolt D through the slot in the rail E. 

7
Hydraulic clamp F and washer G should remain in  position. 

8
Remove plate J and wear pad H.
Assembly






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9
Fit wear pad H, plate J and bolt D. 

10
Fit new lock tab B and fit nut C. 

11
Set the hydraclamp clearance as described in Sideshift  - Hydraclamp Clearance Setting. 

12
Repeat procedure steps 5 to 11 for the bottom clamp.
The only difference on the bottom clamps is the wear
pad is on the opposite side of the rail from the top
clamp so bolt K need not be completely removed.
Note: If the wear pad is trapped between the rail and
carriage, lower the bucket to relieve the load on the wear  pad. 

13
Lift the bucket and set the carriage to the opposite end  of the travel, repeat the procedure for opposite side. 

14
When all clamps have been assembled recheck the
hydraclamp clearance of all clamps
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