Discussion:
Stuck in Forward

I'm stuck in forward. It moves forward in Forward and Neutral. In Reverse it sometimes moves forward, but most of the time it seems to want to move in reverse, but can't-like the brake is on. Any ideas?
  • Posted 14 Jul 2012 14:19
  • By junkyard
  • joined 14 Jul'12 - 17 messages
  • California, United States
Showing items 1 - 9 of 9 results.
ok- I am still using the lift, so I have to put it back together after each diagnostic session---I've been collecting information because I want to do as much as I can in each session. I think I can spend some quality time with the unit in the next few days, and I will test the functionality of the various components as per the manual and instructions I have received. I will update this post after I have done some significant testing. Thanks to everyone for your suggestions!
  • Posted 18 Jul 2012 21:07
  • By junkyard
  • joined 14 Jul'12 - 17 messages
  • California, United States
just to clarify 'control valve' i mean the transmission control valve not the hydraulic control valve.
and yes if something went wrong in that 'transmission' control valve it could effect just about anything controlling the transmission function.
But my origional comment was intended to guide you towards checking the electrical side of the directional circuit, starting at the control solenoids on the transmission control valve and work your way backwards to the directional switch.
  • Posted 18 Jul 2012 20:37
  • By Jplayer
  • joined 12 Apr'07 - 407 messages
  • North Carolina, United States
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net
It's not a monotrol. Is there anything in the control valve assembly affects both clutch packs and the inching pedal? The bias is definitely towards the forward gear.
  • Posted 17 Jul 2012 22:49
  • By junkyard
  • joined 14 Jul'12 - 17 messages
  • California, United States
even though it could be a possible clutchpack issue i would start by checking out the control valve.
- signals to the solenoids (make sure its not trying to engage both at same time while in reverse)
- if it is monotrol then check the pedal assy real good

then take pressure readings
  • Posted 17 Jul 2012 21:55
  • By Jplayer
  • joined 12 Apr'07 - 407 messages
  • North Carolina, United States
John Player Jr
_________________
LiftOne, LLC
Charlotte, NC
Email: jplayer@liftone.net
According to the tag, the delivery date was in 1997, and the S/N is D187V04384T. I added my email address to my profile.
  • Posted 17 Jul 2012 11:28
  • By junkyard
  • joined 14 Jul'12 - 17 messages
  • California, United States
Do you have the Serial # of the truck in question and also do you have a email to post in your profile in case anyone wanted to contact you?
  • Posted 15 Jul 2012 20:34
  • By kevin_t
  • joined 2 Dec'10 - 1,301 messages
  • Pennsylvania, United States
I haven't checked the pressures. I probably need to get a service manual before I go much further, because I don't know how to do that. I am a decent mechanic, and I've changed mast seals and rebuilt the top end on another lift, but I may be in over my head on the transmission. I can try draining the oil though. Also, one other symptom: the inching pedal works, but it seems like it isn't engaging fully. If I rev the unit with the pedal depressed it will overcome the brake and move forward. Thanks for your help!
  • Posted 15 Jul 2012 14:31
  • By junkyard
  • joined 14 Jul'12 - 17 messages
  • California, United States
If the forward clutch pack has warped or broken discs and is dragging bad, thats the symptoms you get. One quick test you can do is drain the oil out and start it. If it still wants to move forward, while in neutral, it definitely has a damaged clutch pack.
  • Posted 15 Jul 2012 13:24
  • By mrfixit
  • joined 11 Dec'08 - 1,434 messages
  • New York, United States
Sounds like it may have stacked the packs in the transmission. Have you done pressure checks to see if the pressures are correct?
  • Posted 15 Jul 2012 13:04
  • By meliftman
  • joined 31 Jan'12 - 209 messages
  • Alabama, United States
Liftman
Retired
Elberta, Al.

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