TM-9-2320-279-10-1
M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)
OPERATOR’S MANUAL VOLUME 1 OF 2
DECEMBER 1998
CHANGE 5
TM-9-2320-279-10-1 - Page 57 of 773
TM 9-2320-279-10- 1
Vehicle Operation Systems (Cont)
1-18. POWER STEERING HYDRAULIC SYSTEM.
Figure 1-20 shows ho w
power is supplied to the main steering gear (1) by an engine driven pump (2). The
fluid reservoir (3) is shared with the main hydraulic system. The steering
wheel (4) is mechanically linked to the main steering gear. The steering wheel
rotates a gear that positions a spool in the main steering gear. This motion is
hydraulically sent to a piston in the slave gear (5) causing it to follow the rotation
of the main steering gear. The main gear pitman arm (6) is mechanically
connected to the slave gear pitman arm (7). These pitman arms move the steering
mechanism on the front axles (8) left or right causing the vehicle to steer left or
right.
On the M984E1 the power is supplied to the main steering gear (1) by an
engine driven steering/tensioner pump (9).
Figure 1-20. Power Steering Hydraulic System Components Location.
1-3 8
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