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  1. H

    40ha hyd pump help

    I've been battling a not moving, sometimes moving but slow and jerky 40ha for a while. i finally put a new controller on it (the oe was broke and mostly non responsive--sometimes I had voltage on the colored brown PQ wires and sometimes not) I can get it to move some but the lift usually has to...
  2. H

    In need of a PQ controller-40ha- 1600116-- 120-813

    i've got a hantek (generic pico type)usb scope that I'm going to try to figure out how to hook up on the controller wires to see if I can see the pulse and make heads or tails of it..
  3. H

    In need of a PQ controller-40ha- 1600116-- 120-813

    Sorry I should have clarified mine is the old standard bang bang with only 1 controller.... When I search my # on ebay there 250, and if I knew 100% that that was the issue and my pump was good I'd shell out the $$..By the low serial # I'm going to say it's the OE one.. I've fought one thing or...
  4. H

    In need of a PQ controller-40ha- 1600116-- 120-813

    Does anyone have a good working PQ 1600116 controller they would sell? I'm thinking mines bad but don't want to shell out $250 right now not knowing.. I get 12v to yellow, brakes are releasing, but unit barely moves if it moves at all.. Brown- blue / red have about 1.9v at full sweep.. I know...
  5. H

    Jlg 40ha ??

    I'll go on the hunt.. I'm having a heck of a time with idle, mid and high rpm. sometimes everything works ok, then it does to heck.. On the back of the panel, there the starter relay and a adlow relay that I think is a starter lockout relay. I've not followed all the wires for the 301 but...
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    40HA woes "again"

    No sorry the work pump was building pressure all the time due to the dump valve was always active. Not the aux pump. It works thru the toggle. Also what is a adlow relay mounted to back of ground box by governor controller? Thanks
  7. H

    40HA woes "again"

    Thank you.. "1 - on ground control, all the time " So when on ground control the dump valve is "always" hot 12V? Reason is someone had a jumper wire on the BB dump relay to make it hot all the time. My small motor driven pump would get so hot I couldn't touch it. I removed the jumper and now...
  8. H

    Jlg 40ha ??

    Well I’m back working on the jlg. Had pump / drive issues. Work pump was getting very hot and hyd pressure would drop. Found that someone had the dump valve relay jumped causing the valve to always be energized. Now I’m having idle, low, high rpm issues. Sometimes it works ok. Other times idle...
  9. H

    JLG 40 hydraulic cylinder seal

    Well dang I completely missed what hex you were talking about. My apologies. I was referring to the one on the end of the cylinder rod. I’m not sure on that one. Mine has round pins with slots on the ends that metal plated slide in and hold that pin in place. I do know there a pita to remove.
  10. H

    JLG 40 hydraulic cylinder seal

    Absolutely.. I'm still struggling with my aged 40ha but she's as handy as a pocket knife when working.
  11. H

    JLG 40 hydraulic cylinder seal

    The ring #3 / 24 is on there tight--like 4' pipe wrench tight-.. a few of mine I had to leave pinned to the machine, break the nut loose, then remove. The way the assembly is made you will have to remove the nut then pull the whole rod assembly out without messing up the rod (I had to use a 4...
  12. H

    40HA woes "again"

    My 90ish 40ha ford dual fuel standard controls lift has had different issues since I adopted her.. She's always been sluggish and jumpy in drive / rev, she's blown her fair share of cylinder seals and rotted hoses, she's been neglected, and on and on.. Last year I loaned her to a neighbor and...
  13. H

    JLG 40 hydraulic cylinder seal

    you may have fixed this already.. I've had to remove and "rebuild" nearly all my cylinders on my 92 40ha and it's a PITA. I did mine by myself and as safe as I could with what I had. Most seals and packing are reasonable online. A few I had to anchor the cylinder end and pull the rod end out...
  14. H

    1990 JLG 40ha hydraulic ??

    Can you send me these diagrams? Please. Also checked a few pressures this morning. Unit cold, gauge on pump exit quick diss. low to mid rpm 2400psi, high idle 3000psi, switch to platform idle 1600psi. So the pump out goes to the 3 stack, tees and goes into the 4 stack valves. Are these valves...
  15. H

    1990 JLG 40ha hydraulic ??

    That is GREAT mine has 1 pg (that is messing up too) for drive and the rest toggle with a ford vsg engine.. Thank you
  16. H

    1990 JLG 40ha hydraulic ??

    Thanks, Is the H hydraulics and wiring the same as the HA?
  17. H

    1990 JLG 40ha hydraulic ??

    Thanks, I don't fully understand the hydraulic circuits, do these system free flow or bypass fluid until a valve or solenoid is triggered? If so could fluid be bypassing the valve? I can feel the valve actuate when the toggle is activated I just don't know what the fluid is doing. And it seems...
  18. H

    1990 JLG 40ha hydraulic ??

    agreed but the swing, wheel turn, tele in /out, basket tilt and swing all work as they should. The hyd pump does not sound like it's stalling or dragging the engine down. IF I can figure out where the test ports are I'll start at the pump and work forwards. I'm thinking the lift and tower maybe...
  19. H

    1990 JLG 40ha hydraulic ??

    Does anyone have a clear diagram of 2792002 3120805 and where the hydraulic test ports are and the type of adapter or fitting I need? Thanks,
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