1982 1.5 ton green and white Sears floor jack .The lowering control valve will neither fully release,or lift under weight.Able to keep raising lift arm even with valve backed off.Valve itself rotates freely internally,and it is just a checkball mechanism.Clean oil,no external leaks,very good condition piston and ram surfaces.Main ram not binding when I drained oil and pulled linkages free,and and no pivots were binding. 328.12002. Sure would be nice to rebuild this,the main frame is in nearly mint condition.Someone let this jack sit for over 10 years. I may be better off rebuilding a better hydraulic core if this one has an inheirant factory flaw. I thank all of you for posting. These jacks are some of the best.First one-Silver 2 1/4 ton has lasted since 1985
Floor Jack.Bad release valve circuit.Sears 328.12002
- Thread starter TracField
- Start date
Here's a GJ thread about that jack. Includes a scan of the owners manual (w/ parts list.)
http://www.garagejournal.com/forum/showthread.php?t=64667&showall=1
http://www.garagejournal.com/forum/showthread.php?t=64667&showall=1
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If it won't unseat under load, it must be welded in there... Ha.. Have you unscrewed the entire release mechanism from the block and physically put eyes on the ball/needle? Is the Gear movement transferring to the threaded part? This is something simple...
Thank you.That is helpfull in addition to what I have found-The main ram plunger was completely disenigrated! No wonder all that junk went into the control circuits. I will in part bench bleed the jack to flush the system somewhat. Surprisingly,jack would actually still raise up and down(erracticly with effort)with a 150 pound load.No signs of rust or wear in the hydraulic cylinders.My first'Greene' Sears jack.It was nice to find this in the scrap pile recently.
Update-Found excellent exploded view parts drawing for this jack at HCRCnow/Lazzars hydraulic parts.Just use this model number 328.12002 to search there.The photo sheet has all the items clearly labeld right on the diagram,So there is less paging back and forth. This realease valve is working freely internaly,(took apart)but I will flush the circuits to remove all the fragmented rubbish,from the main ram seal (completely gone) that is causing the problem I think.
Side note,just bought a good replacement cast iron 6.5 inch diameter saddle here,but the original(lost) is forged steel,which may also be avaible on this site.
If you do not grease the saddle post,it will wear badly and start almost coming out of its socket.Very unsafe.I built up the forged saddle base on another jack with weld and ground it down to fit snugly. As you know,welding cast iron without exact proven techniques will make it crack.It was in fact,the saddle socket itself that wallows out over time here,which is cast iron.Other series jacks went to more a stamped steel socket base I think.
Side note,just bought a good replacement cast iron 6.5 inch diameter saddle here,but the original(lost) is forged steel,which may also be avaible on this site.
If you do not grease the saddle post,it will wear badly and start almost coming out of its socket.Very unsafe.I built up the forged saddle base on another jack with weld and ground it down to fit snugly. As you know,welding cast iron without exact proven techniques will make it crack.It was in fact,the saddle socket itself that wallows out over time here,which is cast iron.Other series jacks went to more a stamped steel socket base I think.
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I also found when the main piston cup breaks down, the broken pieces block the release circuit. It may still work but raises slowly only with a light load at best and slow to lower- like overnight.
Search for sears floor jack 328.12001 and you can find some picks of when i rebuilt mine. 3 posts in total.
Search for sears floor jack 328.12001 and you can find some picks of when i rebuilt mine. 3 posts in total.
Hello Hiball
Thanks for coaching us all here.As I have three jacks to rebuild,I am planning on a few tools to carry on with.Not sure which inside micrometer to use for say,measuring the inside seal side depth in the asian floor jack pump horseshoe piston.I may buy one complete seal kit anyway just to copy,and the rest go through Martin Fluid Power.I have noticed a few things like c clips,bolts,wheel washers going for $5.00 each if bought through the specilaity parts sources.-I can make my own repair kits for less!
Thanks for coaching us all here.As I have three jacks to rebuild,I am planning on a few tools to carry on with.Not sure which inside micrometer to use for say,measuring the inside seal side depth in the asian floor jack pump horseshoe piston.I may buy one complete seal kit anyway just to copy,and the rest go through Martin Fluid Power.I have noticed a few things like c clips,bolts,wheel washers going for $5.00 each if bought through the specilaity parts sources.-I can make my own repair kits for less!
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If you had 30 floor jacks to service I would reccomend Martin fluid Power/Hercules Seals, they probably will sell you a handful of seals, but in reality there target audience is aimed at vendors buying 100 pieces at a time. I think you will find there shipping a bit excessive. The Oring store has gotten good reviews for overall prices, Then of course there are numerous online vendors and maybe some local shops in your area. It will make you sick if you check bulk prices and then individual prices thru various vendors, I've seen online shops charging $20 bucks for a 2 dollar seal. With that said... They have the overhead and need to make a living, not to mention what are you going to do with 100 Ucups/Orings? In regards to calipers, even the cheap HF set will serve your needs.