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Recent content by 4Mile

  1. 4

    JD 4450 Hydraulic pump replacement

    I have a 10,000 hour JD 4450 MFWD at the shop with the hydraulic pump near dead. The tech manuals procedure has you moving the front drive axle and steering motor forward in the frame to get clearance to remove the pump. This tractor has a mount frame for a JD quick-attach loader bolted on to...
  2. 4

    JLG 40 FRC Lift Schematics

    To me the critical part is the circuit board, the mechanical side of the controls are fine. The new control helped but the one track still is not functioning correct. Loads the hydraulic but moves a part rotation and locks. Remove the track jacked it off the ground and all seems fine with out...
  3. 4

    JLG 40 FRC Lift Schematics

    Received the replacement 1600001 Racine controller today. They (Aerial Spe******t Inc) said it was an identical piece and as the photo shows they were correct. In fact during conversations with Jim he stated they have been building and supplying JLG's replacements. Something you may wish to know...
  4. 4

    JLG 40 FRC Lift Schematics

    The replacement controller is being shipped from Racine WI. Thanks "excavator". Also appreciated your help "OFF". Will let you know if the replacement is successful. They had 15 in stock which would indicate it must be a popular item for them.
  5. 4

    JLG 40 FRC Lift Schematics

    Have the capability to bread board up a circuit board if absolutely necessary but would prefer not. So I appreciate your efforts.
  6. 4

    JLG 40 FRC Lift Schematics

    There are two 2 spool Racine proportional valves, one section for a function (lift or swing), the other for propel. Each is fed by one of the 9.5 gal sections of the gear pump. One section in each valve is connected to a pair of track drive motors (both end wheels of a track are driven) on each...
  7. 4

    JLG 40 FRC Lift Schematics

    Time to update the situation with 40FRC. This time I have included a picture. The wiring schematics were a great help even thought the terminal indications and most of the colors are not the same. Circuits continuity tested OK. Replaced some wiring and splices at the proportional valves. Removed...
  8. 4

    JLG 40 FRC Lift Schematics

    I started out working for CASE in 1976 doing technical support for the newest backhoe, the 580C. There weren't a dozen switches on the whole machine. Retired from Caterpillar in 2011 as field technical support for large asphalt pavers. The next version of the largest pavers were being released...
  9. 4

    JLG 40 FRC Lift Schematics

    Thank you. I have seen your handle appearing in nearly all the posts concerning the model 40 F lifts. You appear to be the resident expert.
  10. 4

    JLG 40 FRC Lift Schematics

    An Electrician friend has obtained a 1978 JLG 40 FRC. It is unique in comparison to the common 2WD tire units as it is equipped with tracks. It is in reasonable shape for its age and is suffering from the normal aged wiring issues and a number of "baling wire/duct tape" repairs. Good news is the...
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