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Diesel engine exhaust contains products of combustion which may cause personal injury. Always start and operate the engine in a well ventilated area, and, if in an enclosed area, vent the exhaust to the outside. |
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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, and the 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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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates. |
Introduction
Varying hydraulic oil temperatures or abnormal vacuum pressure in the hydraulic system may indicate a plugged hydraulic tank breather. Perform this procedure to test the condition of the hydraulic oil breather.
Test Preparation
- Drive the machine to a smooth, horizontal surface.
- Move propulsion lever (1) to the NEUTRAL position.
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| Illustration 1 | g03749808 |
- Move throttle control switch (5) to the LOW-IDLE position.
Note: The engine rpm will appear on machine display (2) .
- Move parking brake switch (4) to the ON position.
- If the machine is equipped with a leveling blade, use blade control lever (3) to lower the blade to the ground.
- Allow the engine to run for 5 minutes. Move engine start switch (6) to the OFF position
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| Illustration 2 | g03749872 |
Test Procedure
- Slowly remove cap (7) from the hydraulic tank. Listen for escaping pressure. The cap is not vented. Replace the cap.
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| Illustration 3 | g03749821 |
Adjustment Procedure
- If there was pressure in the tank, replace breather (8).
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| Illustration 4 | g03749905 |