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#1046936 - 12/15/07 01:28 PM Hydraulic jack won't pump up
Kestas Offline

Registered: 06/04/02
Posts: 11189
Loc: The Motor City
My hydraulic jack won't pump up the lift mechanism. The lever mechanism works okay and the unit is full of hydraulic fluid, but it won't pump up. This is a Prolift 3300 lb jack with wheels and the hydraulic pump is mounted horizontally.

I believe it may have air in it that needs to be bled. What is the procedure for bleeding air out of the unit?

This has happened in the past and I've always managed to get it working... but not this time. The unit is over 20 years old, but I don't want to toss it if it's still repairable.

#1046937 - 12/15/07 01:30 PM Re: Hydraulic jack won't pump up [Re: Kestas]
XS650 Offline

Registered: 12/21/03
Posts: 12385
Loc: Northern CA
Sounds like a dead seal.
Whenever you find yourself on the side of the majority, it is time to pause and reflect.

--Mark Twain

#1047038 - 12/15/07 05:23 PM Re: Hydraulic jack won't pump up [Re: XS650]
88Dakota Offline

Registered: 02/02/07
Posts: 55
Loc: Massachusetts
From what I remember of the bleeding procedure, you're supposed to loosen the release screw and pump it for a while.

#1047108 - 12/15/07 07:16 PM Re: Hydraulic jack won't pump up [Re: 88Dakota]
SHOZ Offline

Registered: 06/28/03
Posts: 2861
Loc: Illinois
Yes it needs bled. I have that problem as mine gets hauled around.
2008 Hyundai Accent 1.6L 5 sp manual hatchback
2010 Hyundai Genesis Coupe Track 2L Turbo 6sp manual

#1047225 - 12/15/07 11:10 PM Re: Hydraulic jack won't pump up [Re: SHOZ]
alreadygone Offline

Registered: 01/04/06
Posts: 3161
Loc: North Arkansas
88Dakota's reccomendation is correct. In it's normal position, open valve and pump repeatedly. ten when valve is closed it should work properly.

To which version of reality would you like to convert me?


#1047230 - 12/15/07 11:23 PM Re: Hydraulic jack won't pump up [Re: Kestas]
Merkava_4 Offline

Registered: 01/30/07
Posts: 12643
Loc: Clovis, CA
A lot of these floor jacks have no rebuild kits available; they're pretty much a throw-away when the seals give out.

I've go an old Taiwanese made 3.5 ton jack that needed some steel balls for the races in the swivel casters. I was so dang stubborn, that I went and found a place that stocked the steel balls I wanted; now it rolls real nice.