TM 9-2320-366-10-1
1-22. M1089 MATERIAL HANDLING CRANE (MHC), 30K
WINCHES, AND UNDERLIFT ASSEMBLY (CONT)
Figure 1-27. Material Handling Crane (MHC), 30K Winches,
and Underlift Assembly (Cont)
d. Hydraulic System. All of the hydraulics on the M1089 are connected to a common
power source and supply system. The M1089 is provided with a hydraulic tank (13) with
a capacity of 74 gallons (280 L) of fluid. Hydraulic pressure for the MHC is supplied by
a three stage hydraulic pump (14) attached to the rear of the PTO (15). The hydraulic
cylinders on the MHC contain valves which stop the movement of the cylinder in case of
sudden hydraulic pressure loss. A manually operated back-up hydraulic pump (16) allows
you to lower any load to the ground and stow the MHC if the three stage hydraulic pump
fails.
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