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I have 1630 -79 with an eigthport hydraulic pump.
At idle RPMs are there a distinct banking noise from the hydrulic pump, when reaching 8-900 rpms, it ok.
When using a pressure gauge, the pressure varies a lot at idle, but steady at higher rpms.
Seemes like the hydraulic is working ok, there is enough oil, and oil was replaced the other year.
An old mechanic said it was a valve in the pumpe which made the noise.
I was thinking of an overhaul, replacing worn pistons, springs, valves and so on. The hourmeter read 6200 hours.
Any suggestions what to do?
What are the most likely valves to make this noise?
At idle RPMs are there a distinct banking noise from the hydrulic pump, when reaching 8-900 rpms, it ok.
When using a pressure gauge, the pressure varies a lot at idle, but steady at higher rpms.
Seemes like the hydraulic is working ok, there is enough oil, and oil was replaced the other year.
An old mechanic said it was a valve in the pumpe which made the noise.
I was thinking of an overhaul, replacing worn pistons, springs, valves and so on. The hourmeter read 6200 hours.
Any suggestions what to do?
What are the most likely valves to make this noise?
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