NMC-WOLLARD 2021Truax Blvd., Eau Claire, WI 54703, Phone (715) 835-3151, Fax (715) 835-6625
M140 Tow Tractor Manual No. 46054
PAGE 1-9
CHAPTER 1 GENERAL INFORMATION AND OPERATING INSTRUCTIONS
1 DESCRIPTION
AUGUST 31, 2008
1.4.20 Rear Axle
The rear axle assembly consists of the rear driving axle, differential, and
a planetary hub (Rockwell) at each rear wheel. The rear axle assembly is
coupled to the transmission by a drive shaft and two universal joints.
1.4.21 Brake System
Service Brake
Disc brakes are on the front and drum brakes on the rear.
The brake system consists of individual hydraulically actuated brake units on
the front and rear wheels, a hydraulically assisted master cylinder, a power
booster unit with accumulator, an equalizing valve, a check valve, and the
necessary coated steel tubing and spiral-wrapped ex hoses.
The front brakes are non-adjustable, sliding caliper-type disc brakes.
The rear brakes are self-adjusting, expanding, shoe-type brakes. Adjustment
occurs when the brake pedal is pushed.
The master cylinder has a brake uid reservoir and a mechanically actuated
piston that pressurizes the system when the brake pedal is applied.
The power booster unit provides a power assist to operate the dual master
cylinder system.
The equalizing valve proportions the brake uid between the front and rear
wheel cylinders to provide braking force at each wheel.
The check valve in the rear brake circuit slows down the shoe (drum
brakes) return, thus preventing the rear wheel cylinders form collapsing and
introducing air into the system when the brakes are released.
Parking Brake
The parking brake lever is on the operator’s right. When pulled, the lever
pulls a cable which applies pressure to brake bands which press against the
parking brake drum or disk (attached to the transmission output shaft). The
parking brake is completely mechanical.
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