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Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5296
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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I have a wb140 sn a20239 and the main boom leaks down

Customer Question

I have a wb140 sn a20239 and the main boom leaks down rapidly and II just had the cylinder rebuilt
JA: What is the complete model and serial number of your machine?
Customer: wb140 serial number A20239
JA: Are you fixing this yourself? What have you tried so far?
Customer: yes
JA: Anything else you want the equipment mechanic to know before I connect you?
Customer: I think it is in the control valve
Submitted: 10 months ago.
Category: Construction and Road Equipment
Expert:  Dan replied 10 months ago.

Hi my name is***** will be glad to try to help. Check the spool in the main control valve for leaking by and not returning to center/rest position allowing pressure to bypass in the spool. Also check for scoring and damage of the valve and spool. Also check the joystick controls for sticking as well. Let me know

Expert:  Dan replied 9 months ago.

Hi, Did you get this resolved?

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