Toyota 6HBE30:
6HBE30

6HBE30-25700 I have no power assist with the steering and the forward and reverse movement cannot be modulated full speed only
  • Posted 16 May 2015 03:47
  • Discussion started by mechanicvi
  • Virgin Islands, Virgin Islands
bill
Showing items 1 - 5 of 5 results.
the plugs are in the drive unit (transmission)
80w90 gear oil.
small plug is level check, large plug is fill plug.

caster measurement... not really a spec for this, i generally shim them until it feels right. some of the newar ones have adjustment bolts/holes and also a nice rubber block that can wear out but still remain intact. when adjusting you have to make sure the drive tire still has enough pressure/grip to stop the truck both loaded and unloaded.
  • Posted 21 May 2015 09:55
  • Reply by stam
  • Ontario, Canada
unit is well greased I'm trying to source the tire now How is caster measured and adjusted adjusted? also I noticed a Allen head plug and a vent on rotating part of steering what fluid does it take and to what level is it filled? Thanks
  • Posted 20 May 2015 02:33
  • Reply by mechanicvi
  • Virgin Islands, Virgin Islands
bill
a crowned poly tire usually helps, along with proper caster set up and a good grease job.
  • Posted 20 May 2015 01:08
  • Reply by stam
  • Ontario, Canada
is there a different material tire that would make it easier to steering? it is very difficult to turn wheel
  • Posted 20 May 2015 01:01
  • Reply by mechanicvi
  • Virgin Islands, Virgin Islands
bill
I have not seen a 6HBE30 with "power assist steering."
Forward and reverse question: Do you have to "play with the throttle control to get movement? If you do then my best guess would be the Travel Potentiometer in the control handle.
This is easily checked with a DVOM.
With battery disconnected, and key off.
Remove tractor cover.
Disconnect plug from the PMC (programmable motor controller).
This is the "black box" on the left.
Set DVOM to OHMs.
Connect DVOM leads to PMC connector wires 14 and 16. (note: do not force leads into the connector. I have used a small paper clip, cut about 3/4 inch long, bend a loop in one end to hold the meter lead and the other end fits comfortably in the connector. Do not allow leads to touch each other.)
These wires 14 and 16 come directly from the Travel POT (potentiometer).
A GOOD READING : throttle at rest = zero or close to zero.
Slowly rotate throttle = gradual increase from zero to 6500
ohm.
Slowly rotate throttle other direction = gradual increase
from zero to 6500 ohm.
If ohms jump , skip, go too high or low then the Travel pot is bad.
REPLACE IT.
New pot will need to be soldered to the wires. When reinstalling it , make adjustment to get the above ohm readings.
Check throttle for smooth movement and return to off, correct as needed.
  • Posted 19 May 2015 09:10
  • Reply by BenjaminF
  • Georgia, United States

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