natemarine
Active Member
Hello
For a few years now I and several mechanics have been trying to get to the bottom of this issue on my excavator. It began as a load on the hydraulics you can hear when you start the machine. Starts and sounds normal, then the hyd system loads up and you can hear it put a load on the engine. For a period of time, surging the right track would return the system to normal load, only to return in 3 seconds. It also used to have worse problems in fall and winter but went all summer with no problem. Now it has manifested into a problem of mayor power loss, the machine will stall/deadhead at the with most functions tracks and stick seem to be affected the most. Replaced pilot pump, rebuilt pilot valve, both full of debris and not functioning properly. To my amazement this did not solve the issue. Replaced 2 leaking cylinders that may have discharged the debris into the system also. Just ordered dp sensor, angle sensor, high speed solenoid, but we are guessing. It is an asian machine and biggest problem is I can't find specs for it or plug in to it for diagnotsitcs because it is grey market. Another off symptom I'v noticed is that when machine sits on a steep incline while working it works correctly for a period of time. Yesterday I was letting it idle after getting pilot pump and everything back on and the engine idle excellerated on it's own with the hydraulics safety lever still in off position. It did it again so I climbed in the cab and the green lights on the dash were dim and flickering. Alternator has been tested. I could really use some advice, can't replace the machine just yet got to get back to work.
For a few years now I and several mechanics have been trying to get to the bottom of this issue on my excavator. It began as a load on the hydraulics you can hear when you start the machine. Starts and sounds normal, then the hyd system loads up and you can hear it put a load on the engine. For a period of time, surging the right track would return the system to normal load, only to return in 3 seconds. It also used to have worse problems in fall and winter but went all summer with no problem. Now it has manifested into a problem of mayor power loss, the machine will stall/deadhead at the with most functions tracks and stick seem to be affected the most. Replaced pilot pump, rebuilt pilot valve, both full of debris and not functioning properly. To my amazement this did not solve the issue. Replaced 2 leaking cylinders that may have discharged the debris into the system also. Just ordered dp sensor, angle sensor, high speed solenoid, but we are guessing. It is an asian machine and biggest problem is I can't find specs for it or plug in to it for diagnotsitcs because it is grey market. Another off symptom I'v noticed is that when machine sits on a steep incline while working it works correctly for a period of time. Yesterday I was letting it idle after getting pilot pump and everything back on and the engine idle excellerated on it's own with the hydraulics safety lever still in off position. It did it again so I climbed in the cab and the green lights on the dash were dim and flickering. Alternator has been tested. I could really use some advice, can't replace the machine just yet got to get back to work.
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