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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
763H Hydraulics - bucket curls down on its own
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<blockquote data-quote="MNBobcat" data-source="post: 93249" data-attributes="member: 3234"><p>I got the ram apart. The nut on the end of the rod was very loose so that was definitely a problem. I was going to just tighten the nut and put it back together since the seals were replaced a couple years ago but then I noticed that the seal on the piston was actually split in half (torn). Also a problem. I forgot that I had a service manual for it. According to the service manual, there is an o-ring that goes under a sort of tan colored seal on the piston. It said to remove o-ring, remove seal, install o-ring, then stretch the seal on a special tool until it would fit over the piston and slide down into the groove. Then you're supposed to install a ring compressor for 3 minutes to force the seal to compress back into its original shape. Well, I installed the small o-ring, then worked the seal over the piston and into the groove. I have to borrow my ring compressor back from my son in-law before I can put it back together though. Oh, and when I replaced the seals a few years ago I never put an o-ring under that tan seal on the piston. It has always worked fine though, surprisingly. Also, on the cap end I don't have an o-ring with a backer washer like most seem to have. Instead, I have a green seal that has two parallel ridges on the seal. Presumably it acts sort of like if you had two o-rings side by side. The only o-ring on the cap is the one that creates the seal near the threads and serves as sort of a gasket when you put it back together. So all in all I found 2 things wrong. Missing o-ring under the seal and a loose nut. I tightened the hell out of that loose nut and did use blue loctite on it.</p></blockquote><p></p>
[QUOTE="MNBobcat, post: 93249, member: 3234"] I got the ram apart. The nut on the end of the rod was very loose so that was definitely a problem. I was going to just tighten the nut and put it back together since the seals were replaced a couple years ago but then I noticed that the seal on the piston was actually split in half (torn). Also a problem. I forgot that I had a service manual for it. According to the service manual, there is an o-ring that goes under a sort of tan colored seal on the piston. It said to remove o-ring, remove seal, install o-ring, then stretch the seal on a special tool until it would fit over the piston and slide down into the groove. Then you're supposed to install a ring compressor for 3 minutes to force the seal to compress back into its original shape. Well, I installed the small o-ring, then worked the seal over the piston and into the groove. I have to borrow my ring compressor back from my son in-law before I can put it back together though. Oh, and when I replaced the seals a few years ago I never put an o-ring under that tan seal on the piston. It has always worked fine though, surprisingly. Also, on the cap end I don't have an o-ring with a backer washer like most seem to have. Instead, I have a green seal that has two parallel ridges on the seal. Presumably it acts sort of like if you had two o-rings side by side. The only o-ring on the cap is the one that creates the seal near the threads and serves as sort of a gasket when you put it back together. So all in all I found 2 things wrong. Missing o-ring under the seal and a loose nut. I tightened the hell out of that loose nut and did use blue loctite on it. [/QUOTE]
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763H Hydraulics - bucket curls down on its own
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