Control Chief TM6000 Betreibershandbuch PDF herunterladen (Seite 84)

TM 10-3930-660-10

0006 00-14

OPERATION UNDER UNUSUAL CONDITIONS - CONTINUED 0006 00

EMERGENCY BOOM OPERATIONS - CONTINUED

b. To retract the hoist cylinders, hydraulic oil must bypass the hoist cylinder counterbalance valves by flowing through

the flow control valves. The flow control valves are located on the top side of the base of the hoist cylinders.

WARNING

Do not loosen the 1 in. hex nut or remove the stem on the flow control valve when the cylinder is pressurized

due to a raised boom or load. If the high hydraulic pressure is released, the boom could drop and cause

severe personal injury.

(1) Loosen the 3/4 in. hex nut locknut on the flow control valve stem (located on the top side of each hoist cylinder

base end).

(2) Unscrew the stem with a 3/16 in. allen wrench to the internal stop.

c. Actuate the emergency steering pump by turning the emergency steer switch and the starter-run control switch to the

ON position.

d. Move the hydraulic joystick forward to lower the boom until the load or forks are about 24 in. (61 cm) above

ground level.

e. Return the system to normal operation as follows:

(1) Return the hydraulic joystick to the neutral (center) position.

(2) Turn the starter-run control switch and the emergency steer switch to the OFF position.

(3) Screw both flow control stems in until they are seated and tighten locknuts.

(4) Install the transmission cover.

409-058

ROD END

FLOW CONTROL VALVE

3/4 IN. NUT

1 IN. NUT

HEAD END

COUNTERBALANCE VALVE

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Control Chief TM6000 Betreibershandbuch Seite 84