LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED
SUSPENSION RELIEF VALVE. Relieves pressure surges or gradual increases in pressure to
BUMP STOP CYLINDERS. Limit upward travel of roadwheel arms when in SPRUNG position
(one on each side).
INTERMEDIATE WHEEL VALVE. Prevents No. 2 and 3 actuators from raising when lowering
front of vehicle.
CHECK VALVE. A device to control the direction of fluid flow.
COMPENSATING PUMP. Provides pressure to vehicle for SPRUNG/UNSPRUNG hydraulic
MAIN HYDRAULIC PUMP. Fixed displacement pump that pulls hydraulic oil from the reservoir to
perform whatever function is necessary.
SAFETY, CARE, AND HANDLING
Warnings are listed in the warning summary front of the manual and before specific steps where they
apply in the troubleshooting tests. In addition to these warnings, always keep in mind the following when working
on the M9:
The hydraulic system operates at pressures up to 4,500 psi (31,028 kPa).
Ensure the upper apron lockpins are installed anytime personnel are working on the apron
or dozer blade and anytime the apron is raised.
Never operate the ejector when personnel are in the bowl.
Always place support stands under the hull before crawling under the vehicle. The vehicle
suspension will settle down after engine has been shut off.
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