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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. If you must park on a grade, chock the machine.
- Apply the service brake to stop the machine. Move the transmission control lever to the NEUTRAL position.
- Move the speed control lever to the LOW IDLE position.
- Engage the parking brake.
- Lower all attachments to the ground.
- Stop the engine.
- Turn the engine start switch to OFF position and remove the key.
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Dry nitrogen is the only gas approved for use in the accumulators. The charging of oxygen gas in an accumulator will cause an explosion. An explosion can be eliminated by using nitrogen gas cylinders with standard CGA (Compressed Gas Association, Inc.) No. 580 connectors. When nitrogen gas is ordered, make sure to order the cylinders with CGA No. 580 connectors. Do not rely on color codes or other methods of identification to tell the difference between nitrogen and oxygen cylinders. In any application, never use an adapter to connect your nitrogen charging group to a valve outlet used on both nitrogen, oxygen, or other gas cylinders. BE SURE YOU USE DRY NITROGEN (99.8% purity). |
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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. |
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Escaping fluid under pressure, even a pinhole size leak, can penetrate body tissue, causing serious injury, and possible death. If fluid is injected into your skin, it must be treated immediately by a doctor familiar with this type of injury. Always use a board or cardboard when checking for a leak. |
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Cylinders equipped with load control valves can remain pressurized, even with hoses removed. Failure to relieve pressure before removing a load control valve or disassembling a cylinder can result in personal injury or death. Ensure all pressure is relieved before removing a load control valve or disassembling a cylinder. |
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Sudden movement or accidental starting of the machine can cause personal injury or death to persons on or near the machine. To prevent personal injury or death, perform the following: Park the machine on a smooth, level surface. Lower the work tool to the ground and engage the parking brake. Stop the engine and remove the key. Block the wheels and install the steering frame lock. |
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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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Perform the following steps prior to the pilot pressure diminishing. The procedure should be performed no more than 1/2 hour after the engine has been shut off. |
- Move the machine to a smooth, horizontal location. Move the machine away from other operating machines and away from personnel. Place the transmission direction control switch in the NEUTRAL position. Engage the parking brake and put chocks in front of the wheels and behind the wheels.
- Lower the scraper bowl to the ground.
- Shut off the engine.
- Turn the engine start switch to the ON position
- Operate all hydraulic controls through all positions to relieve hydraulic pressure. Repeat this step until all hydraulic pressure is released.
- Turn the engine start switch to OFF position and remove the key.
- Slowly loosen the filler cap for the hydraulic oil tank to release the pressure.
Braking and Hydraulic Fan System
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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. |
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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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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. |
To relieve the pressure from the braking and hydraulic fan system, lower the bowl to the ground, and lower the apron onto the bowl. Then stop the engine and chock the wheels. The pressure in the brake accumulators can only be drained by repeatedly depressing the service brake foot pedal until the oil pressure is drained. Do not assume that all the pressure is removed from the system because the brake pedal does not have resistance.
Remove the pressure when you work on any part of the braking and hydraulic fan system. Turn the key to the OFF position. The pressure in the brake accumulators can only be drained by repeatedly depressing the service brake foot pedal until the oil pressure is fully drained.
Insure that the Duo-Cone seal break-in procedure has been performed prior to testing the system
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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.