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Yes. All the TM's have is a single part for the whole motor. I'm starting a whole file for all the stuff needed for this truck and would love to have it handy. Better yet I would love to see it with the rest of the M939 TM's so everybody can get to it.
I would be interested in that drawing. PM sent
I tried to fix mine. A few times. I solved it with a small piece of metal and a welder. Cut the nub off. Ground down and weld it all around
It's the design. All seals leak. Even mechanical fluid seals on water pumps and whatnot use the fluid as a lubricant and the tiny amout that gets by evaporates. Hydraulic rams, motorcycle forks, power steering rams, screw pumps, etc, etc... They all leak. If they didn't they wouldn't lubricate the shaft. Most applications it's pretty negligible. Some applications need drains. Without a parts fiche in hand I'm going to guess that this motor has an annular area between the seals (aka a gland) that is meant to be drained. Fairly high pressure, probably a low lip seal area. Pressure gets trapped in there and eventually makes it past the second seal and in to the first gear reduction area. In bad cases it appears it gets to the final gear reduction, fills it all up, then spurts out the vent. I suspect the weep hole is blocked by the gasket on those machines. I think I got lucky with mine it was open and only filled the first gear reduction before alerting me by dripping out. The vent line was barely wet after a good exercise. It's not a return it's just a drain. I think you're right about checking the other motors out for drains at the seal glands that may be blocked off. It appears at some point they changed drive motors and this never got addressed. Not suprised the fellows were instructed just to change them out. Should have seen the mountain we had to climb to get EMD injectors redesigned because they insisted on running JP8 in them all the time and they kept burning up. In the military the nail that pops up gets hammered down so.... not suprised at all.
thanks for the input, if the "normal" weeping into the annular area is extremely small for healthy motor, wonder if a simple 1oz collection cup would work instead of plumbing a return from the various motors back to the tank and just be emptied checked every few months? or is "normal" weeping far greater?
That's complicated. Depending on the load it may weep a little and may weep out a lot. Right? Personally I want the deck to stay clean because I rarely have a helper and don't want to slip on the deck running across it. In my experiment I ran about 6 feet of 1/4" tube back to the tank fill hole and didn't do any lifting just running it. I didn't monitor it but the line was wet when I checked. That's more than a small cup I think. Also it's one less thing to worry about. I still haven't drilled the return fitting for the proper final plumbing the tube is stuck in the fill with a rag wrapped around it. It'll run fine that way until I get to it. What I do know is it immediately stopped making a mess. I suppose one could use a bucket but where would you put it? The deck is pretty lean on usable space. YMMV but I think this is a modification worth the time.
Add the folding cat walk like @Mullaney TACOM prototype wrecker has
THAT truck is totally different! Catwalk is cool but I think I'm leaving mine stock. It's historical after all.....
It's a prototype mule that the people at Aberdeen used. It'll lift just as much as the standard pump. IMO 816s are much stronger than 936s. They are same wrecker setup but can run at idle for operation which allows for more slow movements with the crane.
I agree, i hate my deck not being as clean and slip free as possible, my cable/hook drive motor weeps almost nothing (well for now), but my rotator motor is past weeping and is making a mess. not sure if it needs some true TLC or if a return line will catch the weepage and i'm good to go. thanks for the input, i'm always up for why one solution works or might be better than another. guess i'll add this mod to the list .... right infront of installing the remote control for the rear winch, i have the controls, just haven't got around to the install.
Not sure how many different motors are there, but here are two different ones i have.
attached are the PDFs for the motors. The TM is not specific to only the crane winch motors on the M936.
OK so the top motor I have on the hoist and the bottom motor is on my rotator table. The TM points to both being the same part number which is a Parker 3169310251 as seen in the parts diagram posted. It's also known by it's NSN and Parker number PH PGM075C842**. I've found this motor for as low as $887.50 brand new. There's also another parts diagram for this located here: https://www.wilson-company.com/imag...ps/Parker PGP 020 Series Pumps and Motors.pdf
