Grove Published 3-22-2021, Control # 702-02 4-137
GRT8120 OPERATOR MANUAL OPERATING PROCEDURES
Retracting and Locking a Telescopic Section
During telescoping motion you are not to select Lock. Under
no circumstances, while the tele cylinder is moving, should
you select and press the symbol (4, Figure 4-129).
• Retract the telescopic section slowly and as far as
possible, refer to Table 4-1 for the expected value for the
precision length sensor (Item 2 in Figure 4-128) when
the boom sections are fully retracted.
• Now select and confirm the symbol (1, Figure 4-129).
The telescopic section can be locked (if the actuator is able
to release the section pins, and the telescoping boom
section is actually aligned with a pinning hole). The screen
should appear as shown in Figure 4-132. In particular,
S2111N should be ON.
CAUTION
Machine Damage Hazard!
If you select Lock during telescoping, the locking pins on
the telescopic section are slid out immediately and they
can damage or tear the electrical or hydraulic components
in the main boom.
Table 4-1 Locking point distances for telescopic boom sections (Millimeter)
T1 (mm) T2 (mm) T3 (mm) T4 (mm) T5 (mm) T6 (mm)
0% 0 269 531 794 1057 1277
50% 4140 4444 4699 4923 5063 5172
92% 7591 7927 8174 8366 8403 8418
100% 8249 8590 8836 9022 9039 9036
Table 4-2 Locking point distances for telescopic boom sections (Feet)
T1 (ft) T2 (ft) T3 (ft) T4 (ft) T5 (ft) T6 (ft)
0% 0.00 0.88 1.74 2.60 3.47 4.19
50% 13.58 14.58 15.42 16.15 16.61 16.97
92% 24.90 26.01 26.82 27.45 27.57 27.62
100% 27.06 28.18 28.99 29.60 29.66 29.65
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