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Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5425
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Gradall XL5200 kills the engine when you operate any valve

Customer Question

Gradall XL5200 kills the engine when you operate any valve function. It was working and now it is building 4000 psi at the pump & the flow out of the pump is 40 gpm when you operate any valve function but the oil does not seem to be getting to the function
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Dan replied 1 year ago.

Hi Rick, My name is***** this cutting out like you turned off the key or like it is under a heavy hydraulic load causing the engine to stall?

Customer: replied 1 year ago.
under heavy load, we did a pump repair on the Rexroth pump about 1-1/2 years ago and the system has worked fine since then. Now all of a sudden the customer says it is killing the engine. We had them put a flow meter and pressure gauge at the outlet of the pump and he says as soon as you actuate any function the pump shows 40 GPM & 4000 psi. When all of the function are in a neutral position there is no flow and minimal pressure. The customer says the extend function for instance will slowly extend about 5 feet even though the pump is flowing 40 gpm at 4000 psi and then kill the engine. He says they have not changed anything it just started doing this.
Expert:  Dan replied 1 year ago.

Pull the hydraulic filter and see if there is signs of any fine metal/debris indicating a component or pump failure occurring. check for any return restrictions as well.

Expert:  Dan replied 1 year ago.

If clean and no restrictions, check the pump signal pressure and for proper operation of the pump control valve. sounds like it is going full stroke or neutral and nothing in between. See what the signal pressure is doing with gauges connected. Let me know