HYDRAULIC SYSTEM.

TM 9-2320-279-20-1

Vehicle Operation Systems (Cont)

(fig. 1-15)

1-19. HYDRAULIC SYSTEM.

a . A l l M o d e l s E x c e p t M 9 8 4 E 1 . Pump (1) mounted on the rear of engine provides the fluid power

to operate the power steering (2) only. Fluid power for the self-recovery winch (3), heavy-duty winch

(M984 only), crane (4) and fuel tanker dispensing components (M978 only) is provided by a hydraulic

pump (5) driven by the power takeoff (PTO) mounted on the transmission. A manually operated selector

valve (6) is used to activate either the self-recovery winch (3), crane (4), the heavy-duty winch (M984

only) or the fuel tanker dispensing components (M978 only). Both pumps (1) and (5) share the same

r e s e r v o i r (7).

b. Wrecker Recovery Model M984E1. Pump (8) mounted on the rear of engine provides the fluid

power to operate the power steering (9) and cable tensioner (10). Fluid power for operating the heavy-duty

winch (11), self-recovery winch (12), crane (13), and retrieval system (14) is provided by a hydraulic

pump (15) driven by the power takeoff mounted on the transmission. Self-recovery winch valve (16)

directs hydraulic power to the self-recovery winch (12). Heavy-duty winch control valve (17) directs

hydraulic power to the heavy-duty winch (11). Operation of the crane (13) and the retrieval system (14) is

controlled from the control panel (18) at the rear of the truck. Both hydraulic pumps (8 and 15) share the

same reservoir (19).

Figure 1-15. Hydraulic System