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  1. W

    1998 terex tb60 cummins idle

    Ever since I had the local tractor shop do an oil and filters change my Terex Cummins 4B3.9-C runs rough at the 2nd of the 3 rpm settings (low idle, mid, high) and eventually drops to low (and smooth) idle. I bled the system. When I hold the actuator (2 years old) in the correct position...
  2. W

    1998 TEREX TB60 won't move

    Replacing the board got it moving, but no high-speed (3.5 mph) I replaced a bad connector and one of the proximity sensors and finally got running correctly. It's booked through October then I'll put it up for sale.
  3. W

    1998 TEREX TB60 won't move

    I called several places that repair controller circuit boards but finally went with a new improved board. The new number is SF4X-4-201. 3 week wait from OEM Controls and $1,923.48. $2,107.60 from Tom, shipped today. If it lasts as long as the original, 17 years - 7,000 hours, I'll be happy.
  4. W

    1998 TEREX TB60 won't move

    I just bought it! It's definitely the SuperFlex 4. I found a place that says that they have repaired other boards like this, so I'll try them first. If not, I'll buy a new one from Tom. List is around $4,000.
  5. W

    1998 TEREX TB60 won't move

    Well, it moved for about 1/4 mile now it's stuck again. The LEDs on the SuperFlex don't light at all. There is 12v going to the board. My guess is that the board is bad. Tom, hopefully, will get back to me today and help verify that it's bad.
  6. W

    1998 TEREX TB60 won't move

    Fixed. :) The input & output cables to the SuperFlex 4 were switched. The previous techs replaced the footswitch and checked all the wiring so they must have swapped the connectors. lesson - never trust the previous tech.
  7. W

    1998 TEREX TB60 won't move

    I found Users Manual at oemcontrols.com ffr: Board is called SuperFlex 4 Reader is called OptiMizer 4 For SuperFlex 4 Systems and/or OPT4 Optimizer. I'll do the troubleshooting later today. iirc none of the 3 LED's were lit last time which indicates a simple power problem, I hope. Called...
  8. W

    1998 TEREX TB60 won't move

    Idle raises to second step when I move the joystick, but no f/r or up/down. Trying to find a dealer that knows what an Optimizer is. No luck, but did find a guy who knows a guy who is supposed to call tomorrow. I will call Tom tomorrow as well.
  9. W

    Terex TB44 Manlift intermittent control problem

    Any idea where I can buy/rent/borrow one? Genie doesn't respond to requests.
  10. W

    1998 TEREX TB60 won't move

    Working on it today. I'll locate the f/r wires and test for signals at the board.
  11. W

    UPRIGHT SB60 problem erratic controls

    Who did you get to loan you an optimizer reader? And what did you finally find out? I know it's an old thread - but it's still applicable to owners of Terex lifts.
  12. W

    1998 TEREX TB60 won't move

    no optimizer reader did the 'extend the boom little by little' test - with no change from the boom - I can start, basket rotate & tilt, and steer. Can't do anything else. Idle raises with foot-pedal. Before calling Tom, I'll locate and run temporary wires to see if I can get it to drive.
  13. W

    1998 TEREX TB60 won't move

    14.1 volts at the upper control box (ucb) Voltage is going through all ucb micro-switches The ucb start/stop key works. I was tracing the dc+ wire (ign switch, circuit breaker, emergency stop), then, without really doing anything, the axle steering started working. but still no...
  14. W

    1998 TEREX TB60 won't move

    Lower controls all work. Upper - Foot Switch raises rpm, no other control works, emergency pump runs pump but no other control works. When it first failed, they played around with the wires in the upper control box, all of the sudden, the uppers worked, they have no idea what they actually did...
  15. W

    1998 TEREX TB60 won't move

    Ground controls are OK. Upper boom controls are OK. Just the drive controls that don't work.
  16. W

    1998 TEREX TB60 won't move

    Talked to owner again - story is slightly different. So, I'll post again when I actually see what's working or not. Thanks
  17. W

    1998 TEREX TB60 won't move

    I'll be helping a friend who has a '98 TB60 that, after a factory rep worked on it, won't move. Said friend is ready to sell it for parts, but I talked him out of it until I get a chance to look at it. It did at least wheel before. I've been looking at the service manual and wiring charts...
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