OPERATING CONTROLS AND PROCEDURES RT9150E OPERATOR MANUAL
3-106
Published 2-23-2017, Control # 644-00
upon the direction from which the wind is blowing (e.g., wind
on the rear of the boom can result in decreased forward
stability, wind on the underside of the boom can result in
decreased backward stability, wind on the side of the boom
can result in structural damages, etc.). To assist you in
determining prevailing wind conditions, refer to Table 3-2.
Wind forces can exert extreme dynamic loads. Manitowoc
recommends that a lift not be made if the wind can cause
a loss of control in handling the load. Manitowoc
recommends that, if the wind speed (velocity) is between 20
mph (32 km/h) to 30 mph (48 km/h), the load capacities shall
be reduced to account for the size and shape of the load and
the wind direction in relation to the machine for all boom and
boom extension lengths. Further, operation of the crane in
wind velocities over 30 mph (48 km/h) is not recommended.
Table 3-2
Cold Weather Operation
Regions with ambient temperatures below -9°C (15°F) are
considered arctic. The following recommendations are for
operating Grove cranes in very low temperatures.
Use particular care to ensure that cranes being operated in
very cold temperatures are operated and maintained in
accordance with the procedures as provided by Grove.
Cranes should have appropriate hydraulic oil, lubricants, and
other auxiliary items required for operation in sub-zero
temperatures. Individual crane functions should be operated
to ensure they are sufficiently warmed prior to performing a
lift.
Operation of cranes at full rated capacities in temperatures
between -9°C (15°F) and -40°C (-40°F) or lower should be
accomplished only by competent operators who possess the
skill, experience, and dexterity to ensure smooth operation.
Shock loading shall be avoided.
Use the correct grade of oil for the prevailing temperature in
the crankcase to prevent hard cranking. Diesel fuel should
have a pour point of 6°C (10°F) less than the lowest
expected temperature. In case of emergency, white
kerosene may be added to the fuel to bring the pour point
down to the required temperature to prevent clogging of
filters and small passages by wax crystals. The addition of
kerosene is NOT recommended for general use.
Operation Below -40°F
For crane operation below -40°F, capacities shall be de-rated
2 percent of the rated load shown on the capacity charts for
each degree below -40°F.
Operation Below -40°C
For crane operation below -40°C, capacities shall be de-
rated 3.67 percent of the rated load shown on the capacity
charts for each degree below -40°C.
Preheating the Hydraulic Oil
NOTE: If the oil is cold, it may take time for the solenoid
valves or the power units to properly operate.
The current hydraulic oil temperature (1) is displayed in the
Monitoring submenu (Figure 3-107).
Wind Force
Wind Velocity
mph (km/h)
Visible Indicator
Effects of wind as observed on land
Beauford
Scale
Designation
Zero (0) Calm less than 1 (<2) No wind; smoke rises vertically
1 Light Air 1-3 (2-5) Wind direction seen by smoke but not by wind vanes
2 Light Breeze 4-7 (6-11) Wind felt on face; leaves rustle; wind vane moves slightly
3 Gentle Breeze 8-12 (13-19) Leaves/small twigs in constant motion: wind extends flag
4
Moderate
Breeze
13-18 (21-29) Raises dust & loose paper; moves small branches
Reduce crane load ratings and operating parameters at 20 mph (32 km/h)
5 Fresh Breeze 19-24 (31-39) Small trees in leaf begin to sway; on ponds, crested wavelets form
6 Strong Breeze 25-31 (40-50)
Large branches in motion; telegraph wires whistle; umbrellas used
with difficulty
Cease all craning operations at 30 mph (48 km/h); lower & retract boom
7 Moderate Gale 32-38 (52-61) Whole trees in motion; walking against wind is inconvenient
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