1998 763F only left hydraulic cylinder is lifting, right sits dormant?

[JamesN]

Picked up a used, well, a beat up 763, front lifting arms were at sometime broken and re-welded. Well the bucket on the left side is two inches higher than the right. Makes leveling anything near impossible. So I cut, ground and prepared to re-weld, in doing so I moved the machine and noted only the left arm hydraulic cylinder is active or working, the right cylinder is not lifting. Any ideas regarding what could cause this issue. Hydraulic fluid level is full.

 

[foton]

crack the side that is not lifting hydro hose and activate that fuction to see if it sprays fluid, if it does the seals in the cylinder are shot and need a refresh. scab a plate over your arm repair to give extra support over damaged areas weld.

 

[Robanybody]

It sounds like your right cylinder is bypassing internally. The finite test is to disconnect the rod end and extend the cylinder all the way with the rod end fitting plumbed to a bucket with a length of hose. When the rod bottoms out and you still get oil from the port, the piston seal has failed. The kits are cheap.
Most of the 763's I've resealed had a "Servon" type seal. It can be any color but it will have a square cross-section . The trick is to boil som water and toss the Servon seal in after you remove the heat. Let the heat expand the seal and install while still hot. Otherwise the buggers can break while you're installing them. I hope this is helpful.
Grease the piston seals before reassembly so they slide past the threads easily. Just red grease will do fine.