TM-9-2330-227-14-P
SEMITRAILER, VAN: SHOP, 6-TON, SINGLE AXLE, M146
TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE (INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST)
JUNE 1985
TM-9-2330-227-14-P - Page 23 of 576
TM 9-2330-227-14&P
EQUIPMENT DATA - CONTINUED
Tabulated Data - Continued
Shipping Cubage
Towing Vehicle
Maximum Towing Speed
Cross country M146
Highway
Tire Pressure
Highway driving
Cross country driving
Sand driving
2021.7 cubic feet (
CU
ft)
(56.6 cubicmeters (m
3
))
2 1/2 ton, 6x6 (2.27 mtons)
30 miles per hour (mph) (48 kilometers
per hour (km/h))
50 mph (80 km/h)
50 pounds per square inch (psi)
(345 kilopascals (kPa))
35 psi (241 kPa)
15 psi (103 kPa)
Section III. PRINCIPLES OF OPERATION
Page
Page
Air Over Hydraulic Brake System . . . . . . . . . . . . . . . 1-9
Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
AIR OVER HYDRAULIC BRAKE SYSTEM
Towing vehicle air pressure is sent through the emergency air line to the emergency relay valve and
then to the air reservoir. When towing vehicle brakes are applied, air is sent through the service air
line to the emergency relay valve. The relay valve then releases air from the reservoir to the air
chamber. Air pressure behind the chamber diaphragm pushes the piston in the master cylinder
which forces hydraulic fluid through the lines to the brake cylinders. The cylinders force the
brakeshoes against the brakedrum. Brakeshoe and drum friction slows, stops, and holds the
semitrailer until the brake pedal is released, allowing applied air to vent.
1-9
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