OPERATING PROCEDURES GRT9165 OPERATOR MANUAL
4-30 Published 7-23-2020, Control # 668-02
2. Moving and locking the telescoping cylinder
The telescoping cylinder moves into the section to be
telescoped, e.g. telescopic section T3 (3, Figure 4-11).
The cylinder locking pins (5) extend – the telescoping
cylinder is locked.
3. Unlocking the telescopic section
(A, Figure 4-12) – When a telescope section is locked at
the 50% (T3, T4, and T5), 55% (T1 and T2), 89%, or
100% position, the telescoping cylinder extends until the
locking pins (7) for that section are clear. When a section
is fully retracted and locked at the 0% position, there is
no liftoff process. The boom section is supported at the
front of the section by the stop blocks instead of by the
locking pins. Because of this, the 0% locking holes are
oversized, and the locking pin never touches the bottom
of the hole.
(B) – The mechanism (10) retracts the locking pins (7) –
the telescopic section is unlocked.
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