After initially mounting wheel and tire assembly, recheck lug nut
torque after the first hour of operation and after the first 8 hours of operation. After
this, check monthly or every 250 hours, whichever comes first. Do not lube wheel
studs as it will result in inaccurate tightening torque. Failure to follow these
procedures could result in wheel mounting failure and loss of vehicle control.
13. Install wheel and tire assembly. Tighten lug nuts per chapter 2, section 4.
Remove safety stand and lower tractor.
1.6 WHEEL CYLINDERS
Wheel cylinders are used to apply hydraulic force to the rear brake shoes. There is
one wheel cylinder on each rear axle end.
NOTICE! If the wheel cylinder is leaking or has failed, it is better to install a new one
rather than repair the old one. The time and cost involved to recondition a cylinder is
usually greater than its replacement cost.
1.6.1 Removal
1. Remove brake drum. Refer to paragraph 1.5.1.
2. Back off brake adjusting bolts if necessary to get clearance between drum and
brake shoes.
3. Disconnect brake line at cylinder. Plug brake line or secure clean rag around
open brake line to keep brake fluid from contaminating brake linings and work
area.
4. Remove brake return spring.
5. Remove securing wheel cylinder to brake. Spread brake shoes apart until ends
of shoes clear cylinder. Remove cylinder.
1.6.2 Disassembly
1. Remove rubber boots from wheel cylinders.
2. Apply low-pressure compressed air to cylinder inlet (if needed) and force pistons
and cups from cylinder bores. Remove spring.
3. If needed, remove bleeder screw from cylinder.
1.6.3 Cleaning and Inspection
1. Clean all parts and dry with compressed air.
2. Inspect boots for tears, holes, and deterioration. Replace if damaged.
AUGUST 31, 2008 CHAPTER 3 OVERHAUL
PAGE 10 1 GENERAL REPAIR
M100 Tow Tractor Manual No. 46052
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