TUG MZ - Section 2: Steer Axle Overhaul; General; Inspection and Overhaul; Bearings and Seals

3-2-1
Orig
CD373
Chapter 3
MZ Tow Tractor Section 2
SECTION 2: STEER AXLE OVERHAUL
A. GENERAL
If tractor has been properly lubricated and maintained and has not experienced damage to the steering
system, the steering components will provide many hours of service without an overhaul. Should
overhaul be required, follow the procedure below:
WARNING: OBSERVE ALL SAFETY PRECAUTIONS DISCUSSED IN
THE SAFETY SECTION OF THIS MANUAL.
B. INSPECTION AND OVERHAUL
1. Jack up the front end of the tractor using normal jacking procedures found in Chapter 2,
Section 1, paragraph G.
2. Inspect the steering linkage rod for damage. Also check for wear of the linkage rod ball joints
by grasping the rod and shaking it. If the linkage rod ball joints are loose, replace the rod.
C. BEARINGS AND SEALS
Grasp the top and bottom of each tire and shake it in and out while observing the hub and spindle area
to detect any wobble or looseness. If any wobble or looseness is noted in the hub and the spindle is
rigid, the wheel bearings and seals should be adjusted by tightening the hub retainer nut. If excessive
noise is experienced after adjustment, the bearings and seals should be replaced as follows:
1. Remove the front wheels by removing the lug nuts on each wheel.
2. Remove disc brake caliper using procedure given in Chapter 3, Section 5, paragraph B.1.
3. Remove the grease cap, cotter pin, outer hub retainer nut, nut lock and inner hub retainer nut.
4. Grasp the hub and slide it off the axle shaft.
5. Remove the inner and outer seals and bearings from the hub and wipe the hub interior clean.
6. Inspect hub interior surfaces (bearing races) for scoring. If the races are scored or worn,
replace with new races.
7. Install new bearings and seals into the hub, packing the bearings with lithium-based grease,
and replace the hub onto the axle shaft.
8. Secure the hub with the retainer nuts and nut lock and replace the hub cap.