OPERATING PROCEDURES GRT8120 OPERATOR MANUAL
4-16 Published 3-22-2021, Control # 702-02
• Boom shall be directly over front. Swing lock shall be
engaged.
• Tires shall be properly inflated (refer to Load Chart
Manual).
• Hook block must be removed from main boom nose.
• Overhaul ball may be reeved over boom extension,
hanging 0.9 m (3 ft) below sheave.
Extended Traveling
Depending upon the tire manufacturer, the higher inflation
pressures normally specified for lifting on rubber are not
recommended for site to site traveling over extended
distances. The higher static/creep 8 kph (5 mph) inflation
pressures may remain in the tire while operating the crane
on site within a distance of less than 6.4 km (4 mi).
Traveling — Forward
NOTE: Cab must be in the fully lowered position for the
drive functions to operate. If cab is not in the fully
lowered position, the Cab Not Fully Lowered
Indicator in the Alerts Area (1, Figure 4-67) of the
Operator Display Module (ODM) is on.
1. With Transmission Shift Lever in neutral (N) position and
the parking brake set, start engine and allow it to
adequately warm up.
2. Press Service Brake Foot Pedal.
3. Disengage parking brake.
4. Position Drive Axle Switch to two-wheel high or
four-wheel low.
5. Lift Transmission Shift Lever up out of detent and push
lever to the forward (F) position. Rotate the
Transmission Shift Lever Knob to the first (1) gear
position. Gear selection “F1” appears in the Operator
Display Module (ODM) to indicate forward propulsion
and first (1) gear are selected.
NOTE: If Service Brake Foot Pedal is not pressed before
shifting to a gear, the gear selection will flash in the
Operator Display Module (ODM) until the
Transmission Shift Lever is returned to the neutral
(N) position. Transmission will not shift.
6. Release Service Brake Foot Pedal and press Foot
Throttle Pedal until maximum first gear speed is
reached. Rotate Transmission Shift Lever Knob to the
second (II) gear position to continue to increase speed.
For additional speed, continue shifting to a higher gear.
CAUTION
Tire Damage Hazard!
For extended travel, check cold tire pressure before start
(refer to tire inflation chart in Load Chart Manual). After
every one hour of travel time, regardless of ambient
temperature, stop and allow tires to cool for at least 30
minutes. At destination, tires must be allowed to cool to
ambient temperature before crane lifting on rubber.
CAUTION
Machine Damage Hazard!
Engage turntable lock pin for travel. Failure to engage
lock pin may allow superstructure to swing uncontrolled,
damaging machine and/or property.
WARNING
Run-away Crane Hazard!
Releasing the parking brake while the low service brake
pressure indicator is on and the buzzer is sounding,
indicating service brakes are inoperable, may result in the
crane rolling away freely without the ability of operator to
stop crane.
Never release parking brake while low service brake
pressure indicator and buzzer are on.
CAUTION
Use four-wheel drive only when more traction is required.
CAUTION
Possible Machine Damage!
Do not down-shift to a lower gear if road speed is greater
than maximum speed of the lower gear.
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