NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M100 Tow Tractor Manual No. 46052
PAGE 2
CHAPTER 2 MAINTENANCE
2 TROUBLESHOOTING
AUGUST 31, 2008
The following are the most likely causes of steering problems:
1. Slipping, oily, cracked, or glazed belt.
3. Air in system, 2-1 - 1.13 and 2.2.
4. Worn, loose, or broken steering linkage.
5. Worn or broken pump or steering gear.
2.1.2 Before Servicing the Steering System
Before servicing, inspect and clean steering system components according to
instructions in this chapter.
2.2 POWER STEERING SYSTEM - USED WITH AT545 TRANSMISSION
The steering gear is powered by a gimbal-mounted, double-acting hydraulic
cylinder mounted on the front axle. The control unit is actuated directly by the
Turning the steering wheel actuates the rotary valve in the power steering unit. As
the valve opens, hydraulic oil travels into a metering motor within the power
steering unit, then out from the motor, through the valve, and out to the retract side
turns, it moves a feedback linkage that returns the rotary valve to center and locks
the steering cylinder in position. The metering motor therefore ensures that the
steering cylinder is precisely controlled by the command received from the steering
wheel.
In the event of a power failure, steering can be done manually by spinning the
steering wheel. In this case, steering wheel movement turns the metering motor
directly through the feedback linkage. The motor is then used as a pump to force
oil into the cylinder, while drawing oil into the suction side (through check valve)
from the return line.
2.3 SYSTEM PRESSURE TEST
A reduction in steering responsiveness may be caused by a faulty pump, relief
valve, or internal leakage in the steering gear or power booster.
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