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Title: Unloader valve for 440B
Post by: lmo506 on October 01, 2014, 04:59:49 AM

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.

Title: Re: Unloader valve for 440B
Post by: snowstorm on October 01, 2014, 05:47:06 AM

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

Title: Re: Unloader valve for 440B
Post by: thenorthman on October 01, 2014, 08:24:23 AM

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

Title: Re: Unloader valve for 440B
Post by: lmo506 on October 01, 2014, 06:17:27 PM

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

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General Forestry => Forestry and Logging => Topic started by: lmo506 on October 01, 2014, 04:59:49 AM