Unloader valve for 440B

[lmo506]

Has anyone ever heard or seen a device that goes on the hyd pump of a 440 that takes the pressure off the system untill it starts? A mechanic i know says he installed many of them but the dealer(s) have no idea what it is.

[snowstorm]

take the grill out there will be a screw with a small roll pin thru it. on the top of the pump. turning it in destrokes the pump. its a piston pump closed center. often times turning the steering wheel very quickly back an forth a little will relive the pressure and it will start

[thenorthman]

Yup, should be right on top of the pump, just remember to back it out until finger tight as soon as she starts.

[lmo506]

Thanks for the info but I guess I should have been a little bit clearer. he said it's like a add on unit. Wired into your starter push button. when you start your machine it releases the pressure till you let of the push button.Thats all i know