Grove Published 04-04-2017, Control # 446-09 3-25
RT770E OPERATOR MANUAL OPERATING CONTROLS AND PROCEDURES
NOTE: Warm-up operation of 4-wheel drive transmission
engaged in 2-wheel drive only could cause
transmission damage.
Hoist
Performing a warm-up procedure is recommended at every
startup and is required at ambient temperatures below 4°C
(40°F).
Warm-up Procedures:
1. Without operating the hoist function, warm the hydraulic
oil (see Hydraulic Oil System, page 3-25).
2. Once the hydraulic system is warm, operate the
unloaded hoist, in both directions, at low speeds several
times to prime all hydraulic lines with warm hydraulic oil
and to circulate gear lubricant through the planetary
gear sets.
Swing Drive and Turntable Bearing
Warm-up Procedures for Temperatures Above -7°C
(20°F):
1. Setup the crane on fully extended outriggers, with the
boom fully retracted and near maximum lift angle with no
load applied.
2. Rotate the superstructure at a speed of less than one
RPM for at least one complete revolution in one
direction, then rotate the superstructure at a speed of
less than one RPM for at least one complete revolution
in the opposite direction.
Warm-up Procedures for Temperatures Below -7°C
(20°F):
1. Ensure the boom is fully retracted and near maximum lift
angle with no load applied.
2. Rotate the superstructure at a speed of less than one-
half RPM for at least two complete revolutions in one
direction, then rotate the superstructure at a speed of
less than one-half RPM for at least two complete
revolutions in the opposite direction.
Axles
Warm-up Procedures for Temperatures Below -35°C
(-30°F):
1. Setup the crane on outriggers.
2. Engage the transmission (see Transmission, page 3-24)
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.
NOTE: Warm-up operation of 4-wheel drive transmission
engaged in 2-wheel drive only could cause
transmission damage.
Hydraulic Oil System
Operating Limits and Warm-up Procedures:
• From 4°C to -10°C (40°F to 15°F): Crane operation
without
a load is allowed with medium engine RPM and
medium function speed (joystick position) until the fluid
reaches at least 10°C (50°F). It is then recommended
that all crane functions be cycled to remove cold fluid
from all components and cylinders of the hydraulic
system. If there is any unusual sound coming from the
crane’s hydraulic pumps or motors, stop the operation
and engine immediately and contact a Manitowoc
distributor.
• From 10°C to 4°C (50°F to 40°F): Crane operation with
a load is allowed with medium engine RPM and medium
function speed (joystick position) until the fluid reaches
at least 10°C (50°F).
• From 95°C to 10°C (200°F to 50°F): Crane operation
with a load is allowed with no restrictions.
Above 95°C (200°F): No crane operation is allowed. Let the
crane’s hydraulic oil cool by running the engine at idle with no
functions actuated.
Engine Operation
Starting and shutdown procedures for most diesel engines
generally follow the same pattern. Therefore, the following
procedures can be applied except where specific differences
are noted. (Refer to the applicable engine manufacturers
manual for detailed procedures.)
Starting Procedure
Make an under-the-hood inspection for fuel, oil, and coolant
leaks, worn drive belts, and trash build-up
CAUTION
Health Hazard!
Diesel engine exhaust can be harmful to your health. Only
operate the engine in a well ventilated area or vent
exhaust outside.
Unexpected Operation Hazard!
Before starting the engine, apply the parking brake and
engage the swing lock.
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