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G-660C & G-880C GRADALL (Crawler)
OPERATION & MAINTENANCE
Lockout valve (sequence valve) used in circuit between
the centerpin and each drive motor.
When the crawler is not actuated the valve plunger is in
neutral, locking all oil in the drive motor circuit.
When pressurized in either direction, the plunger
shifts, permitting a two way flow of oil.
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