OPERATING PROCEDURES GRT655/655L OPERATOR MANUAL
4-12 Published 3-23-2020, Control # 654-04
Engine
Warm-up Procedures for All Temperature Ranges:
1. After starting, allow engine to idle for 3 to 5 minutes
before operating with a load.
2. Cold Engine Startup: After allowing engine to warm by
idling it for 3 to 5 minutes, slowly increase engine speed
to provide adequate lubrication to bearings and to allow
oil pressure to stabilize.
Transmission
For full-load functionality, a minimum sump temperature of
20°C (68°F) is required. Operating the transmission with a
sump temperature less than 20°C (68°F) 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) Cranes:
1. Setup crane on outriggers.
2. Engage transmission with four-wheel drive selected (if
equipped) and allow crane to run at idle until the
temperature of the transmission sump reaches 20°C
(68°F).
NOTE: Warm-up operation of four-wheel drive
transmission engaged in two-wheel drive only
could cause transmission damage.
Alternate Warm-up Procedures for Rough Terrain (RT)
Cranes:
1. Engage parking brake and apply service brake.
2. Shift transmission into the highest gear and increase
engine speed to 1500 for 15 seconds, then allow engine
speed to return to idle.
3. Repeat Step 2 until the temperature of the transmission
sump reaches 20°C (68°F).
Hoist
Warm-up procedures are recommended at every startup and
required at ambient temperatures below 4°C (40°F).
Warm-up Procedures - Standard Hydraulic Oil:
1. Without operating the hoist function, warm the hydraulic
oil (see Hydraulic Oil System, page 4-12).
2. Once 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.
Warm-up Procedures - Cold Weather Hydraulic Oil:
Operate the unloaded hoist, in both directions, at low speeds
several times 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 crane on fully extended outriggers, with boom
fully retracted and near maximum boom angle with no
load applied.
2. Rotate superstructure at a speed of less than one RPM
for at least one complete revolution in one direction, then
rotate superstructure at a speed of less than one RPM
for at least one complete revolution in opposite direction.
Warm-up Procedures for Temperatures Below -7°C
(20°F):
1. Setup crane on fully extended outriggers, with boom
fully retracted and near maximum boom angle with no
load applied.
2. Rotate superstructure at a speed of less than one-half
RPM for at least two complete revolutions in one
direction, then rotate 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 crane on outriggers.
2. Engage transmission with four-wheel drive selected (if
equipped) and allow crane to run at idle until
transmission sump temperature reaches normal
operating temperature.
NOTE: Warm-up operation of four-wheel drive
transmission engaged in two-wheel drive only
could cause transmission damage.
Hydraulic Oil System
Operating Limits and Warm-up Procedures:
NOTE: Ambient temperatures between -10°C and -40°C
(15°F and -40°F) require the use of a cold weather
hydraulic oil (refer to cold weather lubricants in the
section Lubrication and Maintenance, page 6-1).
With cold weather hydraulic oil installed, warming
the hydraulic oil before operating the crane is not
required.
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