TM 9-2330-390-14&P2-21. OPERATING HYDRAULIC CONTROL VALVE.NOTEThis paragraph contains general instructions on operating the hydraulic control valveas well as specific instructions on operating the hydraulic control valve to place thedolly set In a variety of configurations.a. General.(1)The hydraulic control valve (4) is located on the left side of each dolly half. It has three levers (3 and5) which regulate hydraulic fluid flow to operate the lift cylinders (1) and positioning cylinders (2).DO NOT extend or retract a lift cylinder more than 12 in. (30 cm) more than other liftcylinder on dolly half or structural damage to dolly set will occur.(2)Two three-position (RETRACT, NEUTRAL, EXTEND) lift cylinder levers (3) operate the lift cylinders(1). They may be operated separately or in unison as required. Unless operating on uneven terrain, it is best to operatelevers In unison. If operated separately, DO NOT extend or retract a lift cylinder more than 12 in. (30 cm) more thanother lift cylinder on dolly half.(3)One four-position (FLOAT, RETRACT, NEUTRAL, EXTEND) positioning cylinders lever (5) operatesthe positioning cylinders (2) In unison.(4)All levers (3 and 5) are in NEUTRAL position when not being operated.(5)When the levers (3 and 5) are pushed up, the affected cylinders retract. When pulled down, theaffected cylinders extend.2-131
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