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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. |
To relieve the pressure from the coolant system, move the engine start switch to the OFF position. Allow the cooling system pressure cap to cool. The cap must be cool enough to touch with a bare hand. Remove the cooling system pressure cap slowly in order to relieve pressure.
To relieve the pressure from the fuel system, turn off the engine.
High Pressure Fuel Lines (If Equipped)
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Contact with high pressure fuel may cause fluid penetration and burn hazards. High pressure fuel spray may cause a fire hazard. Failure to follow these inspection, maintenance and service instructions may cause personal injury or death. |
The high-pressure fuel lines are the fuel lines that are between the high-pressure fuel pump and the high-pressure fuel manifold and the fuel lines that are between the fuel manifold and cylinder head. These fuel lines are different from fuel lines on other fuel systems.
This is because of the following differences:
- The high-pressure fuel lines are constantly charged with high pressure.
- The internal pressures of the high-pressure fuel lines are higher than other types of fuel system.
Before any service or repair is performed on the engine fuel lines, perform the following tasks:
- Stop the engine.
- Wait for 10 minutes.
Note: Fuel pressure can be monitored by Caterpillar Electronic Technician (ET).
Do not loosen the high-pressure fuel lines in order to purge trapped air from the fuel system.
To relieve the pressure from the engine oil system, turn off the machine.
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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. |
- Park on a level surface and lower the work tools to the ground.
- Engage the parking brake.
- Shut off the engine.
Turn the key to the ON position before moving the control levers.
Move the implement control levers through the full range of travel in order to relieve any pressure that may be present in the implement hydraulic system.
Move the engine start switch to the OFF position.
The key may be in either the ON position or the OFF position before pressing the brake pedal.
Depress the brake pedal repeatedly in order to relieve any pressure that may be present in the brake hydraulic system.
If turned to the ON position, move the key to the OFF position.
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Hydraulic accumulator contains gas and oil under high pressure. Improper removal or repair procedures could cause severe injury. To remove or repair, instructions in the service manual must be followed. Special equipment is required for testing and charging. |
Relieving the pressure in the brake circuit will not release the nitrogen precharge pressure in the brake accumulators.
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Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin. |
| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair 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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 1 | g02596158 |
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Platform cover behind cab that allows access to steering control valve | |
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| Illustration 2 | g02596177 |
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Bleeder screws on top of steering control valve | |
Steering system hydraulic pressure can be released by opening the two bleeder screws on top of the steering control valve. Use the following procedure to release steering system hydraulic pressure.
- Open the cover of the cab platform behind the cab to gain access to the steering control valve.
- Connect a suitable hose to each bleeder screw that is located on top of steering control valve.
- Oil will escape from the steering hydraulic system when the bleeder screws are loosened. Direct the other end of each hose into a suitable container.
Note: Refer to Operation and Maintenance Manual, "General Hazard Information" for information on containing fluid spillage.
- Slowly open the bleeder screws to a maximum of 1/2 turn to allow the oil pressure to be released from the steering hydraulic system. Be certain that the bleeder screw hoses remain directed into the appropriate container.
- Close the bleeder screws and remove the hoses when the pressure is released from the steering hydraulic system. Do not allow the oil that is contained in the hose to spill.
- The oil that is collected during this procedure must be disposed of properly.
- Press the breaker/relief valve release button on the hydraulic tank in order to release the pressure within the hydraulic tank.
- Slowly loosen the hydraulic tank filler cap.
- Tighten the filler cap.
- The pressure in the hydraulic tank has been released. Lines and components can be removed.