TM-9-2320-272-24-3
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4
JUNE 1998
TM-9-2320-272-24-3 - Page 341 of 799
TM 9-2320-272-24-3
Section XI. POWER STEERING SYSTEM MAINTENANCE
4-114. POWER STEERING SYSTEM MAINTENANCE INDEX
4-115.
General Information
4-606
4-116.
Upper and Lower Steering Column Maintenance
4-606
4-117.
Steering Gear (ROW) and Mounting Bracket Replacement
4-614
4-118.
Steering Gear (Sheppard) and Mounting Bracket Replacement
4-618
4-119.
Steering Gear (Ross) Repair
4-624
4-120.
Steering Gear (Sheppard) Repair
4-640
4-121.
Power Steering Assist Cylinder Repair
4-654
4-122
Power Steering Pump Test Equipment Setup
4-658
4-123.
Power Steering Tests and Adjustment (Ross)
4-660
4-124.
Power Steering Tests and Adjustment (Sheppard)
4-664
4-125.
Power Steering Gear Adjustment (On-Vehicle)
4-668
4-126.
Power Steering Pump and Reservoir (M939/A1) Repair
4-670
4-127.
Power Steering Pump (M939A2) Repair
4-674
4-115. GENERAL INFORMATION
The M939/A1/A2 series vehicles use one of two different models of integral power steering gears. Oil flow
from the power steering pump supplies oil pressure for both models of steering gears. Both models direct oil
flow and pressure to the same power assist cylinder mounted on the right aide of the vehicle. The two
steering gears use different pitman arms. Both types of steering gears will work manually in the event of
oil pressure failure.
ROSS STEERING GEAR. This is a recirculating ball-type steering gear with a rotary valve as the control
element. It has both a worm gear and sector shaft adjustments in addition to two adjustable poppet valves.
SHEPPARD STEERING GEAR. This is a shuttle valve and piston-type steering gear with adjustable
plungers controlling power-assisted steering angles. There are no other external mechanical adjustments.
4-605
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