621G, 623G and 627G Wheel Tractor-Scrapers Machine Systems System Pressure - Release Caterpillar


System Pressure - Release
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621G, 623G and 627G Wheel Tractor-Scrapers Machine Systems [RENR8460]
BRAKING SYSTEM
621G, 623G and 627G Wheel Tractor-Scrapers Machine Systems System Pressure - Release
1.1. Air System
2.1. Coolant System
3.1. Hydraulic System

------ WARNING! ------

Personal injury or death can result from sudden machine movement.

Sudden movement of the machine can cause injury to persons on or near the machine.

To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.

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Air System

------ WARNING! ------

In order to prevent possible personal injury, release the air pressure from the air tank before disconnecting any components of the air system.

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To relieve the pressure from the air system, turn off the machine. Refer to Operation and Maintenance Manual, "Air Tank Moisture and Sediment - Drain" for more information.

Coolant System

------ WARNING! ------

Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.

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To relieve the pressure from the coolant system, turn off the machine. Allow the cooling system pressure cap to cool. Remove the cooling system pressure cap slowly in order to relieve pressure.

Hydraulic System

------ WARNING! ------

Personal injury can result from hydraulic oil pressure and hot oil.

Hydraulic oil pressure can remain in the hydraulic system after the engine has been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic system.

Make sure all of the attachments have been lowered, oil is cool before removing any components or lines. Remove the oil filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand.

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  1. Park on a level surface. If you must park on a grade, chock the machine.

  1. Apply the service brake in order to stop the machine. Move the transmission control lever to the NEUTRAL position.

  1. Move the speed control lever to the LOW IDLE position.

  1. Engage the parking brake.

  1. Stop the engine.

  1. Operate all hydraulic controls through all positions in order to relieve hydraulic pressure. Repeat this step until all hydraulic pressure is released.

  1. Turn the engine start switch to OFF position and remove the key.

Information System:

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