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Grove AMZ-66 manlift--looking for help troubleshooting basket controls

Discussion in 'Other Construction/Demolition Equipment' started by sawmilleng, Oct 16, 2013.

  1. paoutdoorsman

    paoutdoorsman Member

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    Location:
    South Central PA
    I'm still uncertain if I have an issue with the transmitter in the upper control box, or the receiver in the lower control box. Still hoping @sawmilleng will be able to verify how the 'Power Output' light functions on his receiver. If I can narrow my problem down a bit, a close look at the solder joints will be in order. Thanks again for sharing your knowledge.
     
  2. paoutdoorsman

    paoutdoorsman Member

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    Location:
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    As an update, I borrowed an oscilloscope and graphed the data link wires. I'm now even more convinced that signal is being sent from the platform transmitter board to the receiver box. @sawmilleng, Any chance you've had a minute to pop a battery in yours and check how the 'Power Output' light functions? I know a guy with some electronics knowledge, and I might have him take a peek inside my receiver box if you are able to confirm that your light stays on after startup.
     
  3. Biddley

    Biddley Member

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    Deer Park, WA
    I was wondering what problems you had when the oil tank was not full. My MZ66B is down about an inch below the minimum line on the sight glass. I took off the plate that has the air breather on it as it seemed like I had put a lot in there and nothing showed.

    My problems are when lowering the boom and other functions, the motor loads up and will die. The boom goes up fine. Travel is slow and several tilt functions lug the motor down. Thanks Brad
     
  4. JUNKER

    JUNKER New Member

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    Ontario, Canada
    Hi Badger I have a "T60 (MZ66) Operator's manual if it helps.
     
  5. JUNKER

    JUNKER New Member

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  6. Biddley

    Biddley Member

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    Hi Junker - I appreciate your posting the link to the manual. I can use it as I didn't have one. Thanks.

    Hi Badger - I wasn't able to find the hydraulic schematic from your link. It may help with my MZ66B unit.

    I topped off my hydraulic tank but it didn't make any difference in performance.

    Most functions have the same problem.

    As an example - operating from ground - Lowering and raising the boom - the motor lugs down and will die if the switch is continually held.

    Even driving the unit goes very slow.

    Bucket functions have the same results - the motor will lug down.

    The following functions lug or load the engine down while using the ground controls:

    Lift – up and down

    Tele - in only

    Platform rotate – both directions

    Platform level – up only

    Also the Auxiliary Pump will not activate – nothing happens.

    I would really appreciate any help – where should I start looking? I think a common valve may not be opening. Thanks for any ideas. Brad Baum 509-995-9428

    Model: MZ66b
    Serial Number: 29418
    Year: 1994
     
  7. Puffie40

    Puffie40 Well-Known Member

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    Location:
    Southeastern B.C.
    Brad, does your engine try to throttle up as the function switch is moved? You may need to examine the throttle solenoid.
     
  8. Biddley

    Biddley Member

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    Location:
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    Not by itself. Even when I pull the manual throttle and rev up the engine it loads up and drags the engine down and will cause the engine to die..
     
  9. Puffie40

    Puffie40 Well-Known Member

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    It sounds like something is not responding when a load is put into the system. Perhaps the pressure compensation mechanism on the pump isn't working?
     
  10. Biddley

    Biddley Member

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    OK, I will try to investigate that. All I have is a parts manual. Any advice on how to test it? And thanks for your responses.
     
  11. Badger1085D

    Badger1085D New Member

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  12. Badger1085D

    Badger1085D New Member

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    Thanks for the manual Junker!
     
  13. Biddley

    Biddley Member

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    I also thank you. I appreciate the time it takes to be involved in forum like this.

    If anyone also has a hydraulic schematic it would be appreciated. I still have a lot of snow on and around the lift. Hoping for a warming but probably not for a couple months.
     
  14. Badger1085D

    Badger1085D New Member

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    John C. likes this.
  15. Biddley

    Biddley Member

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    Oh thanks so much - the 1st link was only one page. This is perfect and will help a lot. I appreciate your help and time. Brad
     
  16. JUNKER

    JUNKER New Member

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    Location:
    Ontario, Canada
    Thanks again Badger, this will help. I think I have a bad diode, no upper contol power