Grove Published 04-04-2017, Control # 446-09 3-23
RT770E OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
lower should be accomplished only by competent operators
who possess the skill, experience, and dexterity to ensure
smooth operation. Shock loading shall be avoided. See
Section 5 of this manual for more detailed information on
operation of cranes down to -40°C (-40°F).
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.
NOTE: Operation of the heater is not permissible:
• At locations where flammable gas or vapors
are found or can be formed (example: at fuel
stations and chemical factories)
• At locations where explosive dust is found or
can be formed (example: coal, wood or grain
dust).
• There is a risk of suffocation when using the
heater!
• Do not operate the heater in enclosed spaces
(example: garages).
To activate the heater, ensure the fuel supply valve from the
heater fuel reservoir is turned to the ON position. Ensure the
battery disconnect switch is turned to the ON position and
push the activation button at the heater control panel. A
green light will illuminate indicating the system is activated.
The start-up and shutdown cycles may take approximately 2
minutes for initialization. Ensure the coolant, transmission
heater, swivel, battery heater, in-line fuel pump, in-line fuel
heater, and hydraulic reservoir heater are heating properly.
To de-activate the heater, push the button at the heater
control panel. The green light will turn off indicating the
system is de-activated. The shutdown cycle may take
approximately 2 minutes.
NOTE: Accelerated discharging of battery will occur when
the 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.
Radiator Shutters
When starting the engine the shutters on the radiator will
close and will open when the coolant temperature reaches
71°C (160°F).
Auxiliary Cab Heater
The superstructure crane cab is heated with an auxiliary air
heating system that runs independently of the engine. The
heat is generated by burning fuel taken from the heater fuel
reservoir.
To heat the operator’s cab, activate the auxiliary diesel
heater and adjust the temperature control switch mounted in
the overhead panel. The fan for the heating system delivers
warm air into an air distribution box. The air is circulated
according to the setting of the controls and then delivered
into the crane cab by a fan through the various air extraction
and air delivery vents. Do not cover the vents with bags, arti-
cles of clothing or any other objects. Keep the hot air inlet and
hot air outlet free of dirt and foreign bodies. Soiled or blocked
hot air lines may cause overheating, and result in damage.
The crane auxiliary cab heater can be operated while the die-
sel engine is running or is stopped as part of the programma-
ble auxiliary heating system). The standard hot water crane
cab heater can also be turned on after the engine has started
and is warmed to operating temperature.
NOTE: When using the heater at high altitudes, the factory
heater setting will need to be re-calibrated for
proper heater operation.
• Heating at altitudes up to 1,500 m (4,921 ft)
Unlimited heating is possible
• Heating at altitudes over 1,500 m - 3,000 m and (4,921 ft
- 9,842 ft)
Heating is possible for short periods at this altitude
(example: driving over a mountain pass or taking a break
while travelling between job sites).
During longer stays, (example: construction job project), the
fuel supply must be adjusted to the altitude or the heater will
malfunction. This can be done by installing an air pressure
sensor kit (Manitowoc part number 90037674). Contact an
authorized Manitowoc distributor or Manitowoc Crane Care
for additional assistance.
NOTE: Accelerated discharging of battery will occur when
the 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.
WARNING
Explosion Hazard!
Before switching on, check if the heater can be operated
at the current site of the crane. There is a danger of
explosion when using the heater around combustible
objects! Do not park the vehicle near objects that are
flammable.
Use caution near the exhaust tailpipe as it will also
become very hot.
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