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Ed's 77 Terex 72-41

Discussion in 'Wheel Loaders' started by mountainguyed67, Jun 8, 2017.

  1. mountainguyed67

    mountainguyed67 Member

    Joined:
    Jun 5, 2017
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    Location:
    Fresno, California, USA
    Starts and runs, but has a few issues before it's ready for work. The emergency brake valve next to the seat was leaking and wouldn't build pressure, I got a rebuilt one locally. The valve in front of it had a broken lever, also got a new one. I'm thinking it's a 4WD switch, not sure. I have a parts manual coming today, no service manual yet.

    Also the transmission is leaking, there's a pretty good drip coming off the small round thing with hose towards center of the picture (underside view). A friend thinks it might be an inching valve. This picture was taken right after pressure washing, it still has water on it.
    IMG_1773.JPG

    Here's a before cleaning picture, whatever the round thing is attached to is also wet. Not sure if it's also leaking, or it's just transferring. The machine is almost two hours away, I will be up there the next few days working on it. Will change the air valves and see about stopping the trans leak.
    IMG_1760.JPG
     
  2. mountainguyed67

    mountainguyed67 Member

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    The parts manual arrived. The small part is "cylinder", the part it goes onto is "control valve".
     
  3. mountainguyed67

    mountainguyed67 Member

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    Location:
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    The transmission leak was coming from above that part, and it's so far up its hard to tell what's happening. Maybe taking off the fender will expose it. Fixed the air leak at the emergency brake valve only to find the rear power cluster (can) that pushes on the master cylinder had an even bigger air leak, put on a spare that bench tested good. Haven't had a chance to try and bleed the brakes yet. Did a lot of pressure washing so I can see what I'm looking at. The steering hydraulic all leaked out between my last two trips up there, both steer cylinders are leaking. The exhaust manifold was loose on the engine, and the gasket bad. I took the manifold off and am going to try and find a gasket.
     
  4. mountainguyed67

    mountainguyed67 Member

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    Location:
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    The local Detroit Diesel dealer had the two gasket halves in stock, six something each. I got the other power cluster being rebuilt. I also have the rod and clevis coming to connect the parking brake linkage, it was missing. I won't be back up there for another week, should have the parts by then.
     
    mikebramel likes this.
  5. mountainguyed67

    mountainguyed67 Member

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    Location:
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    Got the exhaust manifold back on.
    IMG_2011.JPG
     
  6. mountainguyed67

    mountainguyed67 Member

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    There are two air valves next to the seat. Anyone know what the one to the left is? 4WD?
    IMG_2009.JPG
     
    Last edited: Jun 29, 2017
  7. mountainguyed67

    mountainguyed67 Member

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    Location:
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    These three air brake components also need to be replaced.

    IMG_2018.JPG IMG_2022.JPG

    IMG_2024.JPG
     
  8. mountainguyed67

    mountainguyed67 Member

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    Already got rebuilt parts to go back on.
    IMG_2066.JPG
     
    alco likes this.
  9. mountainguyed67

    mountainguyed67 Member

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    The treadle valve I still need to finalize the air hoses, but got most of them on there. The other two are done.
    IMG_2174.JPG IMG_2176.JPG IMG_2178.JPG
     
  10. mountainguyed67

    mountainguyed67 Member

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    found out what it is.
    IMG_2217.JPG
     
  11. mountainguyed67

    mountainguyed67 Member

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    Startup & operate bucket video.
     
  12. oarwhat

    oarwhat Senior Member

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    Location:
    buffalo,n.y.
    We had a 72-10 and a 72-51. The ten never had many problems but it was a gutless machine. The 51 had s ton of power but something was always breaking. the 51 had the same style exhaust manifold. It was always blown open and LOUD!!!. We didn't have the money for new so we'd patch it over and over. My ears still ring from that machine and that's the truth I got tinnitus form running it! I have bad hearing loss and I think most of it came from running that thing. Back in the day REAL MEN didn't wear hearing protection. LOL
     
    mountainguyed67 likes this.
  13. mountainguyed67

    mountainguyed67 Member

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    The piece with two Allen heads bolted on behind the steering box is a control valve, its leaking out of the top cover. I found a parts diagram, the only "seal" it shows is a solid rubber piece under the raised round part of the strap across the Allen heads. oarwhat did you work on this or any of the other stuff I'm working on?
    IMG_2175.JPG

    The book shows this, but it's a book for a six year older machine.
    IMG_2207.JPG
     
  14. oarwhat

    oarwhat Senior Member

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    Our machines were older and we owned them over 30 years ago so I can't help much. Is that control for the trans mission declutch?
     
  15. mountainguyed67

    mountainguyed67 Member

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    Location:
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    No, that's down on the transmission. This is steering control.