OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-138 Published 3-22-2021, Control # 702-02
Unlocking the Telescoping Cylinder
If the telescopic section is locked (typically indicated by
Figure 4-132, you can now attempt to unlock the telescoping
cylinder.
• Select and confirm the symbol (3, Figure 4-129).
The telescoping cylinder is unlocked. In the unlocked
position, the screen should appear as indicated by
Figure 4-133. The telescoping cylinder is unlocked from any
telescoping boom section (unlock symbol shown near the
graphical representation of the tele cylinder - refer to Item 1
in Figure 4-129.
The telescoping boom section is locked (the unlock symbol
is not shown near the graphical representation of the section
pins - refer to Item 2 in Figure 4-129.
In the top row of the proximity switches, S2112N is on, the
others in the row are off. In the middle row of the proximity
switches, S2118N is on, but the others are on or off
depending on the location of the tele cylinder with respect to
telescoping boom sections.
You can now move the telescoping cylinder into the next
telescopic section, refer to Table 4-3 for the expected value
for the precision length sensor (Item 2 in Figure 4-128) when
the tele cylinder is near a connection to a boom section
WARNING
Risk of Damage to Main Boom!
You can select and confirm the symbol for unlocking the
telescopic section. If this does not start the unlocking
procedure, contact your local distributor or Manitowoc
Crane Care.
Table 4-3 Locking point distances for telescoping cylinder (Millimeters)
T1 (mm) T2 (mm) T3 (mm) T4 (mm) T5 (mm) T6 (mm)
0% 0 269 531 794 1057 1277
50% 4110 4414 4669 4893 5033 5142
92% 7561 7897 8144 8336 8373 8388
100% 8219 8560 8806 8992 9009 9006
Table 4-4 Locking point distances for telescoping cylinder (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% 13.48 14.48 15.32 16.05 16.51 16.87
92% 24.81 25.91 26.72 27.35 27.47 27.52
100% 26.97 28.08 28.89 29.50 29.56 29.55
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