blakjak
02-20-2006, 04:01 PM
I've got a 3 1.2 ton Craftsman Professional jack that has finally give up the ghost on me. The cylinder doesn't leak, there's no air in the system, and I can't imagine any seals being bad as it's only about 2-3 years old.
Anyways, It's a one pump up to the desired height, then normal lifting from the contact point on. The first sign of trouble was when it started to not want to lift any weight anymore. It would one-up to the frame just fine, but wouldn't lift anymore (like a bypass had kicked in or something). Now on Saturday I was helping a bud replace a radiator and the one pump capability stopped. It will lift just fine regular pumping, but won't lift to it's full height or sink back down to the lowest position either anymore. There's 2 screws that say "DON'T ADJUST" on the back and I'm wondering if those may need to be fiddled with. I've bled the air out of the system and it's full of oil with no leaks, so if anyone has any answers/ideas, I'd sure be obliged if you'd throw them my way.
Anyways, It's a one pump up to the desired height, then normal lifting from the contact point on. The first sign of trouble was when it started to not want to lift any weight anymore. It would one-up to the frame just fine, but wouldn't lift anymore (like a bypass had kicked in or something). Now on Saturday I was helping a bud replace a radiator and the one pump capability stopped. It will lift just fine regular pumping, but won't lift to it's full height or sink back down to the lowest position either anymore. There's 2 screws that say "DON'T ADJUST" on the back and I'm wondering if those may need to be fiddled with. I've bled the air out of the system and it's full of oil with no leaks, so if anyone has any answers/ideas, I'd sure be obliged if you'd throw them my way.