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Man I appreciate it. That is so much more reasonable than I feared. You are great for sharing the link.
Still may try surplus center might get a pump for $150 or so.
You seem to know your stuff. Is replacing the pump something you think a novice could do? How would you relate t he degree of difficulty?
I can have the pump on a stock 939 truck off in about 30mins. It's simple you need a 3/16 allenhead for the set screw in the shaft.
I've attached pictures of the additional reservoir that was added with the dump. The mechanic said the pump works to raise the cylinder to full extension. He said he checked and there is hydraulic fluid at the top of the lift cylinder. When you attempt to drop the bed, the hydraulic fluid spews out the original filler cap with enough pressure to blow it off the filler tube. After one blow off of oil, the bed will raise one more time smoothly. It once again blows off oil ion the way down. If you try to lift the bed again, the cylinder chatters like it has air in it. I hope that helps.
Slow. I take that back. There was one time it came down hard a few feet and then caught and then came down slowly.
It's still at the mechanic's. I'll do more digging when I pick it up and get back to you. Thanks for the remote diagnostics.
I thought I remembered a small hole in the cap as a vent., like 1/16". With motor it doesn't need much venting but with cylinder, the rod volume will be pushed out and sucked in with each stroke.
