Grove Published 3-22-2021, Control # 702-02 4-135
GRT8120 OPERATOR MANUAL OPERATING PROCEDURES
NOTE: In the Telescoping emergency program, all
functions for retracting the main boom remain
enabled as long as there are no other errors
(hydraulic or mechanical). However, extending
boom sections may require use of a override
switch, and only the telescoping emergency
program with extended capabilities can be
expected to extend any boom section at any time.
The telescoping emergency program with basic
capabilities is intended to be able to get the tele
cylinder to the configuration where the tele cylinder
pinning head can be serviced from the access hole
in the base section, not to fully retract the boom
after failures of sensors or mechanical
components.
NOTE: The speed is restricted to approx. 30% of the
maximum speed.
Error on Length Indicator
• If the precision length sensor for the tele cylinder does
not show a reasonable value, then the second length
sensing can be referred to (6, Figure 4-130). This is
typically from a length potentiometer from the power
cable reel in the boom (it is separate from the precision
length sensor).
CAUTION
Machine Damage Hazard!
When a override switch is used there is no monitoring of
boom up and down, swing, telescoping, or hoist
operation.
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