NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M140 Tow Tractor Manual No. 46054
PAGE 1-18
CHAPTER 2 MAINTENANCE
Front Disc and Pads
1.
provide adequate working space underneath the frame. Support tractor
with safety stands. Be sure that positioning of safety stands does not
interfere with work task.
2. Remove front wheels.
3. Check friction pad wear.
NOTE: There are four pads in each caliper.
4. Pads should be replaced if any pad has 1/8 inch or less friction material
remaining.
5. Inspect brake disc for rust, scoring, ridges, and distortion. Light rust is
not harmful. Disc should be free of excessive or heavy scoring, but some
scoring is natural. If scoring is deeper than .080-in., replace both discs.
Any cracks require disc replacement.
6. Clean up minor roughness with an emery cloth. Discs can be repaired by
honing to a minimum thickness of 0.85”.
7. If brake disc has heavy scoring, ridges, or blue heat spots, machining the
disc may eliminate these problems.
8. Maximum friction surface lateral (side-to-side wobble) allowed is 0.030"
total.
9. Replace disc if wear or distortion exceeds these values.
Wheel Cylinders and Brake Shoe/Drum Assemblies
1. Pull the rear wheel and drum assemblies. Refer to 2-4 - 4.2.
2. Use a dry bristle brush or a clean lint-free cloth to remove lining dust from
shoes, backing plate, springs, drum, and wheel cylinder.
3. Inspect wheel cylinders according to Chapter 3. Repair or replace wheel
cylinder as needed according to Chapter 3.
4. Inspect brake drums for scoring, heat checking, pitting, out-of-round
condition, or concave, convex, or condition. Drum must be free of grease,
oil, scoring, cracking, or uneven wear.
5. Replace drum if inside surface is rough or ragged or if depth of scoring
exceeds 0.010” (0.3 mm). If heat cracks are visible or can be felt with a
6. Inspect lining thickness. If less than 1/8 inch, replace shoe and lining
assemblies and turn drums. Refer to Chapter 3.
1 SERVICING
AUGUST 31, 2008
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