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  1. U

    JLG 40HA drive issues - many hours of testing and still won't go - frustrated.

    We found the issue after a ton of troubleshooting (taking the pump on and off three times). It was a hidden (clogged) filter in the servo motor base assembly. If anyone needs more info comment on this post and it'll email me. I'll log back in and explain more with pics if need be.
  2. U

    JLG 40HA drive issues - many hours of testing and still won't go - frustrated.

    Thanks Willie59. When running the model code through the Sauer Danfoss pump manual it indicates there is a charge pump within the main pump. So my theory with pilot pressure coming from the third pump was incorrect. Sorry it's up-side-down but it was tough to get the camera into position...
  3. U

    JLG 40HA drive issues - many hours of testing and still won't go - frustrated.

    I have carefully read through the following thread started by razerface: JLG 40HA should I buy? Fixer-upper Thread starterrazerface Start dateSep 24, 2010 A lot of great info in this thread. willie59, barklee and OFF all offered a ton of advice but unfortunately razerface never ended the...
  4. U

    JLG 40HA drive issues - many hours of testing and still won't go - frustrated.

    A long story that I will try to make short. The drive function slowly went away on our 40HA. A local hydraulic shop indicated they felt the pump was gone. They found a used pump with the same type of servo motor. We purchased / installed the used pump and the drive function was restored...
  5. U

    JLG 40HA pump needed - Sundstrand MPV046C

    Having drive issues with the JLG 40HA which does not seem to be an uncommon problem. We performed the series of troubleshooting steps with everything pointing towards the pump since nothing happens when we manually override the servo control with the plastic lever. We even capped the main...
  6. U

    jlg 40ha drive problems

    Perfect. That's exactly what we found. Now the question would be should we unbolt the servo unit to see if the mechanism that changes the pump functions to the drive lines actually works when the joystick is pushed forward and back? I would think there is a mechanical arm that slowly changes a...
  7. U

    jlg 40ha drive problems

    Willie59 - Can you confirm that positions 16 and 21 on the main terminal strip are wired directly to the drive servo motor? Does anyone have a good schematic of this wiring? We have a few schematics but they are tough to follow. Thanks, Scott
  8. U

    jlg 40ha drive problems

    Willie59 (and whoever else can lend some help) - My neighbor/friend has the same machine (40 HA) with the exact same problem as DSCONT's machine. We have replaced the joystick with no luck. I have measured DC voltage on the main terminal strip on positions 16 & 21. Both correspond to the...
  9. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex - Thank you for this document - this seems to be a very straightforward procedure. I'm not sure if you remember this but last spring I mentioned to you and FWF that I was planning to build a pole barn to store the excavator in to try to extend its lifespan well into my retirement. Well...I...
  10. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex - I understand what you are saying but I am thoroughly confused how my Q-C is working now. The previous owner just has me swapping the lines out at the stick right above the Q-C (no change of buttons in the cab). It works every time no matter how long a bucket has been attached to the...
  11. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex / FWF - Thank you both for your info. It was good to see the Q-C design in a different format than my service manual so that I am more confident that I understand it. I did have two questions for you guys: 1) It appears to me that the Q-C wedge locking control box uses pilot pressure...
  12. U

    Volvo EC160BLC hydraulic issue with right control functions

    FWF - It is a stock (wedge) coupler. I don't have any pics (not up there right now) but I think I found the correct section in the service manual. I'm trying to make sense of it now. In short - according to the previous owner the two momentary coupler switches in the cab stopped working. In...
  13. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex, FWF or anyone else - A quick question for you on a completely different issue on my 2005 Volvo EC160BLC - could you guys give me a hint as to where the valve is that controls my quick connect piston? I'm assuming this is an electric solenoid type valve that reverses the hydraulic...
  14. U

    Volvo help needed - setting pressure on optional hydraulics for thumb

    Your swing motor actually has 2 separate self contained systems. The lubricant for the drive system is part of your over-all hydraulic fluid system so you are not concerned with that. The actual lubricant oil for the swing motor (which is measured by the dipstick) is just a 90 weight gear oil...
  15. U

    Volvo EC160BLC hydraulic issue with right control functions

    Thanks Uffex. I came home and wanted to do the research to determine exactly what the part numbers were for the check valve plug, valve & spring before a couple months go by and my memory of what we discussed fades.....but I'm getting confused. I thought you had indicated that this check valve...
  16. U

    Volvo EC160BLC hydraulic issue with right control functions

    Thank you both for your help. Here is my situation - I have planned, and I'm now gearing up, to get started on a large project for this summer. As I have said in the past my machines (the Volvo EC160BLC excavator and a Case 650G dozer) are personal "toys" that have been paid for while I'm...
  17. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex - What would your thoughts be if my plan was to simply run the machine in G3 throttle or higher going forward? Is the failure of that check valve going to slowly cause other issues with my machine (pre-mature pump failure, etc) or is the check valve basically a dormant circuit once the...
  18. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex / FwF - I was able to start the weekend early so I made it up to camp and got the machine going (this is the first time I have run it since parking it for the winter). The bad news is the problem happened almost right away and is still very much present with the machine - the good news is...
  19. U

    Volvo EC160BLC hydraulic issue with right control functions

    That's good news - I could not see the relationship to my issue either.....but if you guys don't see it then I know I'm on the right track to disregard.
  20. U

    Volvo EC160BLC hydraulic issue with right control functions

    Uffex - Now that you mention this scenario I remember the issue was the worst two times last summer....and both times I was elevated with the machine loading a dump truck. Both times I was at least 6' higher than I would normally be if I had the machine sitting directly on the ground. I think...
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