TM 9-2320-366-34-1
1-19. M1089 MATERIAL HANDLING CRANE (MHC), 30K WINCHES, AND UNDERLIFT
(CONT)
Figure 1-30. M1089 30K Winches
c. M1089 30K Winches. The left and right 30K winches (1, Figure 1-30) are designed to be used for recovering
stranded vehicles from the rear of the M1089. The 30K winches are rated for a 30,000 lbs (13,620 kgs) pull with a full
drum of cable. Pulling capacity is reduced with each layer of cable that is taken off the winch drum. Pulling capacity
with only one full layer of cable on the winch drum is 15,830 lbs (7,187 kgs). One full layer of cable is the minimum
amount of cable that may be left on the drum when using the winch. The winch is equipped with a fail-safe brake which
is spring applied and hydraulically released. The fail-safe brake is automatically applied when hydraulic pressure falls
below 270 psi (1,862 kPa). The fail-safe brake will hold the load until hydraulic pressure is restored. The winch control
valve functions as a throttling valve when cable is being payed out. The winch control valve controls the flow of fluid
to the winch motor. When cable is being reeled in, the winch control valve acts as a free flow check valve. The winch
control valve is preset at the factory and is not to be adjusted under any circumstances. The 30K winches are equipped
with pay-in/reeled out spoolers (2) to keep tension on the cable when cable is payed-in/reeled out. The 30K winches
can be controlled from either the M1089 control panel (3) or from the REMOTE CONTROL (4).
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