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THenne1713 · 03-09-2023, 11:14 PM

My 23yo Dewald hydraulic seems to have lost the motor this evening, both slides half -retracted and I find THAT SOME Dummy (PO/tech?) connected both slide HOSES backwards, so the MANUAL PUMP TRIES TO EXTEND AND NOT RETRACT; (so that is the tomorrow project in the snow/ cold, fluid loss, etc. and I am NOT happy.) Don't think it burned out, but suspect/ hope maybe a carbon BRUSH issue that can easily resolved once home. Now to find or borrow the right LINE WRENCHES. Ugggggghhhhh Fingers crossed.

Jim_HiTek · 03-12-2023, 09:56 AM

Don't envy your work in the cold. Did the pump just 'quit' or is it struggling?

I ask because many hydraulic systems of that era had a big fuse very near the hydraulic manifold. Mine has a 40 amp and my HWH slides/jacks system just 'died' one morning when prep'ing to leave. But it was in mild temps and the RV park didn't have a problem with me staying on.

I saw the fuse mentioned in the literature but couldn't find it in the RVs banks of fuses. While inspecting underneath the RV, I spotted it in the rats nest of wiring at the manifold and found that it had corroded out. Replaced it with a large modern style with spade lugs.

THenne1713 · 03-14-2023, 01:32 AM

Yup, just died, (23yo) suspect brush issue, have voltage to solenoids and jumper does NOT even make it click forward or reverse; reversed backwards hoses install and manual pump worked to retract, so good to travel. Now to decide if the $85 marine trim system motor is same mount/ same motor as the $195-$700+ RV motor :-) Hmmmmmm? and wondering if I tried every option, or can I manually extend and retract without swapping hoses? I thought not, tried both options, I thought, but later found literature that maybe I was wrong and maybe my procedure? Hmmmm? well, later to determine

THenne1713 · 03-26-2023, 09:12 AM

Well got home and ordered the $78 marine motor vs $195 Rv motor (vs SOME at over $700 motor only); looks exactly same; we will see; email response from one website said they could not cross-ref my part # to say if same or not; coupling is a concern, as NO INDIVIDUAL PART SHOWN and no luck locating any current info on #OK21500 Pump-Motor Assembly? OILDYNE?

THenne1713 · 03-30-2023, 10:43 PM

New motor arrived today, old tested to battery= growl/ spark, new =OK, installed NEW and all functions restored fine. The cheaper $79 Marine mercury trim motor that looks right= is right/ same,= works great: I will try to disassemble and document the old motor and see what issue is; (expecting brushes issue) https://www.amazon.com/dp/B00TPI94H8...roduct_details