Skyjack / Jlg 6042:
Front differential

I've got a 6042 that is building up pressure inside the front differential, pushing the hydraulic oil out around the driveshaft yoke, I checked the relief valve on top of the housing and someone had plugged it off with a pipe plug , reinstalled the vent fitting but it is still pushing oil out of the vent fitting.
Anybody run into something like this?
  • Posted 31 Mar 2021 06:19
  • Discussion started by bruce864
  • Texas, United States
Showing items 1 - 2 of 2 results.
Thanks Swoop , I had a feeling it would be something like that. Just wanting to be sure before I looked into it any further.
  • Posted 2 Apr 2021 07:23
  • Modified 2 Apr 2021 07:23 by poster
  • Reply by bruce864
  • Texas, United States
hi bruce,
i've seen this happen before on a GHEL.
The brake units on the inside of the axle might have a leak filling it up with fluid, that is forcing the fluid out. It sounds like it may have had that issue and someone just plugged off the vent and drained out some oil and let it go. Then after a while it built up more pressure from hydraulic oil coming in and blew out the next weakest point being the axle seal.
Drain out the fluid in the differential and see if it is contaminated with hydraulic oil and may have more than it should.
If this is the case that axle assembly will have to be dropped out and that piston assembly rebuilt or replaced.
Note: if you haven't worked on these before that brake assembly inside the differential has a huge spring in it that can kill you if you try to disassemble it without the proper tools. There are 2 of them, a right and left.
It's a pretty big job and i would not recommend doing it out in the field.
  • Posted 1 Apr 2021 10:34
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

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