TM10-3930-660-20 18-9. RELIEF VALVE, FRAME TILT/BRAKES - TEST/REPLACE This task covers: a. Removal b.  Installation c. Adjustment Initial Setup Tools Materials/Parts Tool Kit, Automotive Mechanics Container, 1 Gal. Lockwashers  (4) Shop  Equipment,  Automotive Loctite 242 (App. C, Item 39) Maintenance, Common #2, Less power Reference Test  Equipment TM10-3930-660-10 Gauge, Hydraulic Pressure Flowmeter,  Hydraulic Test Tee Cap and Plug Set Equipment  Condition Vehicle parked on level ground. Parking brake set. Wheels chocked. Hydraulic oil in the system can be under pressures over 3000 psi with the engine OFF . ALWAYS relieve pressure in hydraulic lines before attempting to remove any component in the hydraulic system. With engine OFF, starter switch in RUN position, and MLRS attachment on the ground, move control levers through all operating positions several times to relieve line pressure. Relieve pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. 18-37