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

                                                       warn！

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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