OPERATING PROCEDURES GRT9165 OPERATOR MANUAL
4-138 Published 7-23-2020, Control # 668-02
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 telescoping 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 4-137). This is from
a length potentiometer from the power cable reel in the
boom (it is separate from the precision length sensor).
This length potentiometer is not as accurate as the
precision length sensor. Thus, the two reels may not
always show the same values.
CAUTION
Machine damage hazard!
Telescoping the main boom when there is an error on the
precision length indication and malfunctioning proximity
switches can result in damage to the main boom, contact
Manitowoc Crane Care or your Local Distributor to
determine if you are permitted to start the telescoping
process. They can provide the passcode to use in the
telescoping emergency program with extended
capabilities.
A situation could arise in which the main boom can no
longer be extended or retracted.
CAUTION
Machine damage hazard!
When an override switch is used there is no monitoring of
boom up and down, swing, telescoping, or hoist
operation.
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