600 lift getting weak

Jim TN · Sep 14, 2020

Pump gets prime right a way, lift works but has gotten weaker, will not pick up a roll of hay and used to. Seems to hold a load fairly well while engine
is running.Suggestions?

Justinwheeler · Sep 15, 2020

Could be that your piston rings in the cylinder are getting wore, to confirm this lift a heavy load up and cut then engine off, if it sinks then there’s a leak somewhere

Justinwheeler · Sep 15, 2020

My 640 seems to max out at a 1000 or there abouts

Jim TN · Sep 15, 2020

It has the oring and backer washer on the piston. I'm thinking it may be a relief valve but do not know which.

Justinwheeler · Sep 16, 2020

It could possible be both, see my 640 needs the piston seals replaced because the lift sinks down and then comes right back up to were it was, it only sinks about a inch or two, I also run 90wf fear oil for the hydraulics so that’s slows the leak down a little bit, no one has been in the hydraulic compartment for 20 or so years, so I’m sure it needs some work in there. But it’s not mine it’s my fathers, but one day she’ll be mine and I’ll pour the love to her.

600 lift getting weak

Jim TN

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Justinwheeler

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Justinwheeler

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Jim TN

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Justinwheeler

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