Broke My Jack

[ouimetnick]

Hi GJ members!

I'm new to the forum, and so here's my first post. I have a Duralast 80630T 3 ton floor jack. It's made by Torin and it's similar to the jack in Hiball's Overseas Jack Rebuild Help Tutorial.

I wanted to change the old dirty fluid it came with and clean the unit up. I removed the pump plunger, the "working valve" (screw to the left of the center gear release thing) and the overload valve (I noted the amount of turns) I've put it all back together and filled it with oil just covering the tip of the inner cylinder.

I followed the proper bleeding procedure but the jack only rises halfway and the pump seems to not start pumping until half way being depressed. However if I keep the rubber fill hole plug off, it works fine. Further more if you put your finger over the hole and start pumping/raising, it creates a vacuum/***** your finger in the hole and then letting the saddle down seems to relieve the pressure. Oddly enough if you take your finger off while it sucked it, air rushes in, and then if you put your finger over it while lowering, oil squirts everywhere.

I was trying to bleed it and i somehow managed to build up pressure causing the rubber filler plug to shoot off the tank and squirt oil straight up. The bleeding procedure I'm following involves pumping it as high as possible, turning the handle lowering the saddle, and pumping rapidly while the handle is unscrewed keeping the saddle down, then pinching the bleeder plug to burp out air.

The jack was working fine before I was curious and broke it. I'm confident everything was put back together correctly. It works fine, but with the filler plug reinstalled pressure builds up or air is somehow getting trapped in so it won't raise fully and it pops the filler plug off. Sorry for the long read.

Thanks in advance,
Nick

 

[469 runner]

Sounds like you might have overfilled the jack as it needs air to displace the oil as jack is raised.

 

[jacked_72]

I'll be curious as to what you learn. I have a jack doing something similar. I had the rubber plug shoot out when I cracked it to bleed the jack. I went through and replace all the orings where air cold be getting in, and while it helped, it seems that no matter what I do I still have some air pressure coming from the fill hole after I use the jack. It has decreased, but air is entering the system somewhere. I suspect the same is true for yours as well. BTW, what I've seen for bleeding instruction is to leave the valve open so that the ram does not rise and pump the jack 15 times or so then crack the rubber plug to release air. Then repeat as often as necessary so that you stop getting air. So either you've got residual air which has not bled out or air is entering your jack somewhere when you're pumping.

 

[Hiball]

It definitely sounds like a air issue, I'll type the bleeding procedure again.

1. Make sure the lift arm is in the down position.
2. Fill with oil to manufacturer specs, or in the case of this jack, just above the inner cylinder, leave the plug off.
3. With the handle in the Release position, pump the handle 6-8 or more times, this will force oil thru the valve circuits and flush any air into the reservoir.
4. Check the Oil level, add if necessary, leave plug off.
5. Close the release and operate the Jack to full extension, Release the Jack and let the lift arm fall.
6. Check the oil level again, Rinse and repeat as necessary till the sound of Air being discharged into the reservoir upon the release is no longer audible.
7. Reinstall the plug.

If your Jack has weak pump seals it can be difficult to sometime get the Jack bled properly.