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Hydra Mac 8A (Gehl 2500) restoration... or "Oh No... What have I done?"
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<blockquote data-quote="vinito" data-source="post: 94092" data-attributes="member: 12954"><p>I was determined to make a little progress today, so I decided to start working on the hydrostat rebuld again. A while back I took apart the "extra" one I acquired, mostly for a little practice and to get a parts list together. Bonus that it turned out to be in really good condition with hardly any wear at all, so lots of good parts if I needed them. Today I took apart the two that came from the loader to make a good inspection. Turns out they weren't too bad. Just a couple parts that I think I'll go ahead and switch out with the new one, but those parts can be made well enough for later. I just figure I'll put the best of the crop back in the loader and the rest will be benched unless I need them.</p><p>I have some decent lapping equipment - small lapping plate and a good range of grits of compounds. So just to make it simple I picked 400 and 800 for rough and finish. I got through all but one cylinder assembly and it's all looking pretty good with just minimal material removal. This thing ought to scoot around like new.</p><p>Here's a sample of a couple parts. It's the valve plates for one of the hydrostats.</p><p>Before on left: Not too bad but there is some wear just deep enough reduce performance slightly.</p><p>After lapping on right: The "spots" is just drip left after the solvent rinse dried. It's actually a flawless, flat bronze surface now. Sure looks purdy.</p><p><a href="http://smg.photobucket.com/user/mikeyphoto/media/Lap%201.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v110/mikeyphoto/Lap%201.jpg" alt=" photo Lap 1.jpg" class="fr-fic fr-dii fr-draggable " style="" /></a>. .<a href="http://smg.photobucket.com/user/mikeyphoto/media/Lap%202.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v110/mikeyphoto/Lap%202.jpg" alt=" photo Lap 2.jpg" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>So there is a small pile of other stuff that has been lapped nicely. One more session of lapping and all the parts will be ready. I'll just have to clean the case, polish the seal areas of the shafts, install new bearings, seals and gaskets (all of which I've already amassed) and these babies will be ready to fill with oil and put into service.</p><p>I don't have pictures, but I've rebuilt the check and relief valves for one of the hydrostats already. They aren't bad at all and work like new now. As usual, the first one always takes longer so the other set will be quick and easy. It's really just replacing O-rings as long as the rest survives inspection, but you have to turn off a ridge using a lathe to access a cap, then TIG tack-weld that back on once it's all stacked back together. Still, it's pretty simple. I'll get some pictures of the next attempt.</p><p>All in all, these particular little hydrostats are <em>extremely</em> simple to work with without scrimping on quality. I was very surprised of the condition of them considering they've been used and put away wet since somewhere around 1974. This next phase should certainly outlast me.</p></blockquote><p></p>
[QUOTE="vinito, post: 94092, member: 12954"] I was determined to make a little progress today, so I decided to start working on the hydrostat rebuld again. A while back I took apart the “extra” one I acquired, mostly for a little practice and to get a parts list together. Bonus that it turned out to be in really good condition with hardly any wear at all, so lots of good parts if I needed them. Today I took apart the two that came from the loader to make a good inspection. Turns out they weren't too bad. Just a couple parts that I think I'll go ahead and switch out with the new one, but those parts can be made well enough for later. I just figure I'll put the best of the crop back in the loader and the rest will be benched unless I need them. I have some decent lapping equipment - small lapping plate and a good range of grits of compounds. So just to make it simple I picked 400 and 800 for rough and finish. I got through all but one cylinder assembly and it's all looking pretty good with just minimal material removal. This thing ought to scoot around like new. Here's a sample of a couple parts. It's the valve plates for one of the hydrostats. Before on left: Not too bad but there is some wear just deep enough reduce performance slightly. After lapping on right: The “spots“ is just drip left after the solvent rinse dried. It's actually a flawless, flat bronze surface now. Sure looks purdy. [URL='http://smg.photobucket.com/user/mikeyphoto/media/Lap%201.jpg.html'][IMG alt=" photo Lap 1.jpg"]http://img.photobucket.com/albums/v110/mikeyphoto/Lap%201.jpg[/IMG][/URL]. .[URL='http://smg.photobucket.com/user/mikeyphoto/media/Lap%202.jpg.html'][IMG alt=" photo Lap 2.jpg"]http://img.photobucket.com/albums/v110/mikeyphoto/Lap%202.jpg[/IMG][/URL] So there is a small pile of other stuff that has been lapped nicely. One more session of lapping and all the parts will be ready. I'll just have to clean the case, polish the seal areas of the shafts, install new bearings, seals and gaskets (all of which I've already amassed) and these babies will be ready to fill with oil and put into service. I don't have pictures, but I've rebuilt the check and relief valves for one of the hydrostats already. They aren't bad at all and work like new now. As usual, the first one always takes longer so the other set will be quick and easy. It's really just replacing O-rings as long as the rest survives inspection, but you have to turn off a ridge using a lathe to access a cap, then TIG tack-weld that back on once it's all stacked back together. Still, it's pretty simple. I'll get some pictures of the next attempt. All in all, these particular little hydrostats are [I]extremely[/I] simple to work with without scrimping on quality. I was very surprised of the condition of them considering they've been used and put away wet since somewhere around 1974. This next phase should certainly outlast me. [/QUOTE]
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Hydra Mac 8A (Gehl 2500) restoration... or "Oh No... What have I done?"
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