TM 9-2330-390-14&P
2-21. OPERATING HYDRAULIC CONTROL VALVE.
NOTE
This paragraph contains general instructions on operating the hydraulic control valve
as well as specific instructions on operating the hydraulic control valve to place the
dolly 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 and
5) 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 lift
cylinder 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 operate
levers In unison. If operated separately, DO NOT extend or retract a lift cylinder more than 12 in. (30 cm) more than
other lift cylinder on dolly half.
(3)
One four-position (FLOAT, RETRACT, NEUTRAL, EXTEND) positioning cylinders lever (5) operates
the 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, the
affected cylinders extend.
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