Discussion:
Steer wandering while driving

The rear axle bushings were beat to **** changed out. Changed steer pins. Changed steer axel. Still the same. Thinking steer orbital?
  • Posted 15 Oct 2022 04:54
  • By Gusstone
  • joined 17 Apr'20 - 25 messages
  • Ontario, Canada
Showing items 1 - 2 of 2 results.
Gusstone,
i ran across some material i have on this truck and there is actually a segment in the troubleshooting section of steering that actually 'specifically' mentions "Vehicle wobbling - straight line instability".
Possible causes:
-Malfunctioning PS valve
-Worn or inappropriately adjusted wheel bearing
-loose road wheel
-excessive freeplay of tie rod clevis pin
-deformed road wheel
Then there is "Excessive freeplay of steering wheel"
Possible causes:
-worn steering shaft and PS valve-connecting spline
-loose PS valve mounting bolt
-inappropriately adjusted wheel bearing
And finally "inappropriate steering wheel return travel"
Possible causes:
-Malfunctioning spool
-Inappropriate centering spring of PS valve
-Inappropriate wheel alignment
-Insufficent tire air pressure

These are the possible causes of wandering steering as you described it.
the possible causes are things to look for so it's time to go fishing sir ;o)
If you've rebuilt the steer axle then you can rule out anything in that area (with the exception of the steer cylinder as previously mentioned) you should check that too.
I also was looking in a diagram of the steering system and it references a '**** position control system'. Does this truck have that? a sensor on the steering wheel and a sensor on the wheel angle? It mentions in this system something about a '**** position correctly solenoid valve'. It describes "By sending some operation oil to cylinder piping by the opposite side, many handles are rotated to a motion of a tire." "Rotation of a handle catches up with the motion of a tire".
But then again if you have play in the steering linkage or a loose wheel that could also contribute to auto correction based on that system causing the truck to wander while trying to drive in a straight line.
Just some things to consider while troubleshooting :o).
"EDIT"
Oh i just discovered FLA's AI caught a word it didn't like... apparently 'K n o b' is an unfavorable word in this forum? Well thats the word the service material uses so it is not being used in any defamatory way but i digress, it is what it is.
  • Posted 15 Oct 2022 22:10
  • Modified 15 Oct 2022 22:14 by poster
  • By swoop223
  • joined 23 Mar'12 - 3,691 messages
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com
I read you said you changed steer axle but did you get new steer cylinder l have seen steer cylinders that were packed with after market packing kits that did that the center packing was not correct but you can't tell when you pack it and some of the fluid gets by and the steering is bad. Just thinking.
  • Posted 15 Oct 2022 14:03
  • By Scott_
  • joined 16 May'21 - 307 messages
  • Pennsylvania, United States
Scott

Post your Reply

Forkliftaction accepts no responsibility for forum content and requires forum participants to adhere to our rules of conduct. Click here for more information.

If you are having trouble using the Discussion Forums, please contact us for help.

Global Industry News
edition #1237 - 3 July 2025
While innovation and new technology are evolving at what seems to be an ever-increasing pace, the need to capture the data (telemetry) from this tech, and the ability to utilise it (telematics) for efficiency and cost savings, is one area attracting more and more attention ... Continue reading
Upcoming industry events …
October 6-9, 2025 - Detroit, MI, United States
October 6-9, 2025 - Detroit, MI, United States
November 14, 2025 - Melbourne, Australia
Global Industry News
edition #1237 - 3 July 2025
While innovation and new technology are evolving at what seems to be an ever-increasing pace, the need to capture the data (telemetry) from this tech, and the ability to utilise it (telematics) for efficiency and cost savings, is one area attracting more and more attention ... Continue reading
Fact of the week
The use of "hello" as a telephone greeting is attributed to Thomas Edison. He is said to have suggested it as a simpler alternative to other greetings, such as "Do I get you?" or "Are you there?".