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Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 27042
Experience:  Technican turned service manager with multiple lines of equipment and rental units.
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Deere 646 wheel loader (compactor) Having issues getting the

Customer Question

john deere 646 wheel loader (compactor) Having issues getting the machine to bleed the hydo's for the drive and for steering.The lift and lower on the loader bucket work great and sometimes the drive and and steering work good. Cant kep the hydros primed and ready at all times. A 5 min shut down can mean a permenant shut down. its hit and miss.. ive added oil into the back hydro pump and put a back check in on the tank side. Any help
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Curtis B. replied 1 year ago.

You say bleeding is necessary? Should not need bleeding! That would seem to indicate that the pump is sucking air. A loss of suction to the pump, and you lose the function. Can be suction leak or a restricted line, letting pump cavitate.

Customer: replied 1 year ago.
I know. I need to know how to resolve the pump issue. We usually take the line that feeds the pump and put lots of hydo fluid in from there close it up and try again.
None of the lines are restricted because i can run it forevever with no issues once it primes either from us or itself. Is there a way to put a manual primer in a hydro line? That way we couldn't introduce air into the system.
Expert:  Curtis B. replied 1 year ago.

If that is required, you have a suction leak or the pump is bad, and can't develop the suction required.