OPERATING CONTROLS AND PROCEDURES RT770E OPERATOR MANUAL
3-24 Published 04-04-2017, Control # 446-09
Air Diverter
An air diverter directs warmed air collected from under the
engine hood when the temperature is below -9°C (15°F) to
preheat the air intake going to the engine.
Super Capacitor
The super capacitor provides additional cranking during cold
weather startup. The super capacitor is connected to the
standard batteries with an isolation relay. The positive relay
feed is activated when the key is in the crank and run
positions.The super capacitor allows the starter to be
cranked for 30 seconds then cycled off for 60 seconds before
cranking again until the engine starts.
Diesel Fuel
Diesel fuel with low temperature characteristics is required to
operate the engine down to an ambient temperature range
from - 40°C (-40°F) to 49°C (120°F). Refer to the applicable
engine manual for proper specifications.
Use the correct grade of fuel for the prevailing temperature.
Diesel fuel should have a cloud point of 6°C (10°F) less than
the lowest expected temperature. In case of emergency,
kerosene may be added to the fuel to bring the cloud point
down to the required temperature.This will minimize clogging
of filters and small passages by wax crystals. The addition of
kerosene is NOT recommended for general use. Refer to the
Cold Weather Package and Lubricants, page 5-3 of this
operator manual.
Operation Below -40°C (-40°F)
For crane operation below -40°F, capacities shall be derated
3.67% of the capacities shown on the load chart for each
1.8°F below -40°F (1°C below -40°C).
CRANE WARM-UP PROCEDURES
The following procedures detail the actions that must be
taken to properly warm the different crane components
before operating the crane.
NOTE: For temperatures below -9°C (15°F) refer to arctic
lubricants and conditions in the Operator and
Service Manuals.
Before starting the crane, ensure the appropriate lubricants
are used for the prevailing ambient temperatures in which
the crane will operate in (a list of lubricants and their
temperature ranges can be found in the Lubrication section
of your crane’s Operator Manual, by contacting your local
Manitowoc distributor, or by contacting Manitowoc Crane
Care directly).
Engine
Warm-up Procedures for All Temperature Ranges:
1. Upon startup, allow the engine to idle for 3 to 5 minutes
before operating with a load.
2. Cold Engine Startup: After allowing the engine to warm
by idling it for 3 to 5 minutes, slowly increase the engine
speed to provide adequate lubrication to the bearings
and to allow the oil pressure to stabilize.
Transmission
Operating the transmission with a sump temperature below
normal operating temperature is limited to:
• operating in the neutral gear or
• driving with an unloaded crane while not exceeding
1500 engine RPM and not exceeding half throttle.
Warm-up Procedures for Rough Terrain (RT) and
Industrial Cranes:
1. Engage the parking brake and apply the service brake.
2. Shift the transmission into the highest gear and increase
the engine RPM to 1500 for 15 seconds, then allow the
engine RPM to return to idle.
3. Repeat Step 2 until the temperature of the transmission
sump reaches normal operating temperature.
Alternate Warm-up Procedures for Rough Terrain (RT),
Truck Mount (TM/TMS), and Industrial Cranes:
1. Setup the crane on outriggers.
2. Engage the transmission with 4-wheel drive selected (if
equipped) and allow crane to run at idle until the
temperature of the transmission sump reaches normal
operating temperature.
CAUTION
Engine Damage Hazard!
If “Ultra Low Sulfur” fuel is not used in engines that require
it, the engine warranty will be void and the engine
performance will quickly deteriorate and may stop
running.
CAUTION
Crane Damage Hazard!
Operating the crane with the incorrect lubricants and
fluids for the prevailing ambient temperature and/or failing
to adequately warm the crane prior to cold weather
operation can lead to a failure of a crane component or
system.
Always use Manitowoc recommended lubricants and
fluids for the prevailing ambient temperature and properly
start and warm the crane using the cold weather
procedures found in this Operator’s Manual and
supplement before operating the crane at full load.
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