TM 9-2320-366-34-1
b. Hydraulic System. All of the hydraulics on the M1089 are driven by a common power source and supply system.
The M1089 is provided with a hydraulic tank (7) which has a capacity of 74 gal (280 L) of fluid. The hydraulic tank
contains an internal fluid filter. The filter removes contaminants from the oil and is easily replaced. Hydraulic pressure
for the MHC is supplied by a three stage hydraulic pump (8) attached to the rear of the Power Take-Off (PTO) (9). The
hydraulic cylinders contain cartridge-type holding valves which lock the cylinder in case of sudden hydraulic pressure
loss. A hand operated back-up hydraulic pump (10) allows the operator to lower any load to the ground and stow the
MHC if the hydraulic pump fails.
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