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- Camp Wood/LC, TX
This 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.
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.
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