2-38 Published 09-06-2019 Control # 691-01
SAFETY PRECAUTIONS NBT60L OPERATOR MANUAL
Table 2-9 Boom Drift Chart (Cylinder length change in millimeters)
MODEL SPECIFIC INFORMATION
On cranes equipped with a boom mounted personnel
platform, use only a platform approved by National Crane.
OVERLOAD INSPECTION
This information supplements the Rated Capacity Limiter
(RCL) manual supplied with each National Crane.
When the RCL system has acknowledged an overload on
your equipment, you must carry out specified inspections on
the equipment.
These inspections apply only to overloads up to 50%. For
overloads of 50% or higher, equipment operation must be
stopped immediately and Crane Care must be contacted for
corrective action.
The following illustrations may not be an exact
representation of your equipment and are to be used for
reference only.
NOTE: If your crane is equipped with CraneSTAR, an
overload warning will be posted to the web site for
review by the equipment owner.
Overload warnings do NOT indicate real time
events! Warnings could be sent 24 hours (or more)
after the actual event.
Coeff. = 0.000774
(1/ °C)
STROKE Temperature Change (°C)
(m) 5 10 15 20 25 30 35 40 45 50 55
1.5 6 12 17 23 29 35 41 46 52 58 64
3 1223354658708193104116128
4.5 17 35 52 70 87 104 122 139 157 174 192
6 23 46 70 93 116 139 163 186 209 232 255
7.5 29 58 87 116 145 174 203 232 261 290 319
9 35 70 104 139 174 209 244 279 313 348 383
10.5 41 81 122 163 203 244 284 325 366 406 447
12 46 93 139 186 232 279 325 372 418 464 511
13.5 52 104 157 209 261 313 366 418 470 522 575
15 58 116 174 232 290 348 406 464 522 581 639
16.5 64 128 192 255 319 383 447 511 575 639 702
18 70 139 209 279 348 418 488 557 627 697 766
Length change in mm = Stroke (m) X Temperature Change ( °C) X Coeff. (1/ °C) X 1000 mm/m
Metric
WARNING
Overload Hazard!
To avoid an accident caused by overload damage to your
equipment:
• Perform the inspections outlined in this publication
for overloads up to 50%.
• Stop operating the equipment and contact
Manitowoc Crane Care immediately for overloads of
50% and higher.
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