3-27
Published 10/19/2017, Control # 618-00
GRT880 SERVICE MANUAL ELECTRICAL SYSTEM
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 Manitowoc.
Always ensure adequate lubrication during system warm-up
and proper operation of all crane functions when operating in
cold weather. Regardless of oil viscosity, always follow cold
weather start-up and operating procedures described in the
Operator Manual. To ensure adequate lubrication during
system warm-up and proper operation of all crane functions,
Refer to Warm-up Procedure, page 5-2.
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 ambient
temperatures between -9°C and -40°C (15°F and -40°F) or
lower should be accomplished only by competent operators
who possess the skill, experience, and dexterity to ensure
smooth operation.
Component Coolant Heater
A diesel fueled coolant heater circulates warm coolant
through engine and crane components when operating
during arctic temperatures. The coolant heater should be
activated 2 hours before starting the crane to allow sufficient
time to preheat fluids and assist with easy start-up
conditions.
To activate heater, ensure fuel supply valve from heater fuel
reservoir is turned to ON position. Ensure battery disconnect
switch is turned to ON position. Push activation button at
heater control panel. A green light will illuminate indicating
system is activated. Start-up and shutdown cycles may take
approximately 2 minutes for initialization. Ensure coolant,
transmission heater, swivel, battery heater, in-line fuel pump,
in-line fuel heater, and hydraulic reservoir heater are heating
properly.
To de-activate heater, push button at heater control panel.
The green light will turn off indicating system is deactivated.
Shutdown cycle may take approximately 2 minutes.
NOTE: Accelerated discharging of battery will occur when
crane engine is switched off. If you run the heater
while the crane engine is stopped, the batteries
voltage will need to be recharged after short
periods of time.
Troubleshooting
In case of faults, check the following points:
• If heater does not start after being switched on:
- switch heater off and on again.
• If heater still does not start, check if:
- Fuel in the tank
- Fuses are OK
- Electrical cables, connections etc. are OK
- Anything clogging combustion air supply or exhaust
system?
• Check openings of combustion air supply and exhaust
system after longer standstill periods. Clean if
necessary!
• If heater remains faulty after these points have been
checked or another malfunction occurs in your heater,
contact an authorized Manitowoc distributor or
Manitowoc Crane Care.
Maintenance Instructions
• Switch heater on once a month for about 10 minutes,
even outside heating period.
• Before heating period starts, heater should undergo a
trial run. If persistent extreme smoke develops, unusual
burning noise, a clear fuel smell, or if electric / electronic
parts heat up, switch off heater and remove from service
by removing the fuse. The heater should not be started
again until it has been checked by qualified staff who
have been properly trained.
WARNING
Explosion Hazard!
Before switching on, check if heater can be operated at
the work site. There is a danger of explosion when using
the heater around combustible objects! Do not park
vehicle near flammable objects.
Use caution near exhaust tailpipe as it will also become
very hot.
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