- Mini Hydraulic Excavator: All
Introduction
The problem identified below has a known permanent solution, use the solution provided below.
Problem
The 153-2994 153-2995 153-2996 153-2997 Couplings (Quick Disconnect) may leak.
Excess dirt and debris may cause the coupling to leak.
Solution
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Hydraulic oil pressure can remain in the hydraulic systems after the engine and pump have been stopped. Serious injury can be caused if this pressure is not released before any service is done on the hydraulic systems. To prevent possible injury, refer to the section, Testing and Adjusting, "Hydraulic System Pressure - Release" before any fitting, hose or component is loosened, tightened, removed or adjusted. When possible, the work tool must always be lowered to the ground before service is started. When it is necessary for the boom to be in the raised position while tests or adjustments are done, be sure that the boom, stick and work tool have correct support. The swing lock (if equipped) must be engaged before service is started. Always move the machine to a location away from the travel of other machines. Be sure that other personnel are not near the machine when the engine is running and tests or adjustments are being made. |
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The hydraulic pressure should be purged prior to removing the Quick Disconnects. Failure to properly relieve the pressure in the system could result in damage to the quick disconnects and components.
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| Illustration 1 | g03846699 |
152-5717152-5718 Dust Caps | |
Additionally the quick disconnects should be protected from contamination while disconnected. Dirt and debris will cause premature failures.
If leaks occur, and cleaning of the male and female coupling does not resolve the issue, replace with like part.
Hydraulic quick connect/disconnect warranty period is 50 hours starting from the date of delivery to the first user.
ReferenceRefer to Warranty, SELF5671, "Caterpillar Limited Warranty" for more information.