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The outfit NDT mentioned in the original post MROSupply.com is also an easy option. I just went in to find that washer (they actually call it a bumper), typed in the part number off the drawing and it pulled it right up. They do have a minimum number purchase - the u-cups were 2 and so are the bumpers - but they also have free shipping.I just purchased the repair parts for the pump yesterday from E&R Industrial Sales in Indianapolis. 317.228.0106. All I had to do was give them the part numbers posted above and they are being drop shipped from SPX.
It's just regular MIL-PRF-5606 hydraulic fluid. Very common on aircraft. It's not expensive or hard to get. I believe others on the forum have used jack fluid, power steering fluid, industrial hydraulic fluid.... It's a simple system, so I don't think it is very sensitive. I'm using 5606.Finally will have some time to replace my power unit seal, any special hydraulic fluid to be used on this pump?
Finally started work on my pump, just found a rubber washer at end of a plunger broken as well....I wish I knew that washer there, would have ordered with the sealThis is the unit that provides the hydraulic power to raise the cab. Mine functioned (barely), but was slobbering hydraulic oil all over the place, and had to be refilled all the time. Today I tore into it. Sure enough, the shaft seal on the plunger was shot, allowing high pressure oil to enter the air chamber and be expelled through the air vent. After digging around in the TMs, turns out this power pack is made by respected hydraulic tool manufacturer SPX Fluid Power, and the packing is called a "U-cup" p/n 14121. For once the "off the shelf" aspect of the FMTV worked out here, and the pump is a part of SPX's line of portable power packs, and the part is available online from MROsupply.com and others.
After action report: Finally got the HPU working again. Mistakes made: Didn't mark the hoses, put them on backwards, wouldn't pump. Didn't seal the air line, some bug made it's nest deep down in the line, plugging it and making me think the HPU wasn't working. And the best of all, I put the U-cup in backwards, and it didn't seal, spraying oil everywhere again. You would think this was my first rodeo.
Just one page back and you would have seen it.Finally started work on my pump, just found a rubber washer at end of a plunger broken as well....I wish I knew that washer there, would have ordered with the seal
Just one page back and you would have seen it.
here you go picture looks like it might help someone else in the future so it's worth loading into here.this is long way around upload a picture, which is kicking me out of SS each time I try....nothing for sale, just click on the below link to see the picture with an arrow pointing to the port in question.
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