TM-9-2320-283-34-1
TRUCK TRACTOR, LINE HAUL, 50,000 GVWR, 6X4, M915A1
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 1983
TM-9-2320-283-34-1 - Page 39 of 624
TM 9-2320-283-34-1
EQUIPMENT DESCRIPTION AND DATA
1-7.
EQUIPMENT CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued).
j.
Steering Gear.
The steering gear is an integral steering unit incorporating a hydraulic control valve, a hydraulic
power cylinder, and a manual steering mechanism.
When the worm shaft is turned by the steering column, recalculating balls mechanically move the rack piston
to
turn
the sector shaft.
Also, when
the worm shaft is turned,
the control valve is turned.
Turning the control valve
directs hydraulic pressure to assist the movement of the rack piston.
When the rack piston
reaches the end of its
travel
at full steer, an
unloading poppet relieves pressure to protect against excessive pressure build-up.
1-28
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