OPERATING PROCEDURES GRT655/655L OPERATOR MANUAL
4-20 Published 3-23-2020, Control # 654-04
Steering
Steering is accomplished by the steering wheel and the rear
steer switch (9, Figure 3-8). These two controls, used
individually or together, provide front wheel steering, rear
wheel steering, four-wheel steering, and crabbing
capabilities (Figure 4-5).
Front Wheel Steering
Conventional front wheel steering is accomplished with the
steering wheel. This method of steering should always be
used when traveling at higher speeds.
Rear Wheel Steering
Rear wheel steering is controlled by the Rear Steer Control
Switch. Moving control switch to the desired position
activates the rear steer cylinders, steering crane in the
selected direction.
Four Wheel Steering
Four wheel steering is accomplished with the steering wheel
and Rear Steer Control Switch. Depending which direction
the operator wishes to travel, the steering wheel is turned
opposite direction of the Rear Steer control position. This
allows crane to turn or maneuver in close, restricted areas.
Crab Steering
Crabbing is accomplished with the steering wheel and Rear
Steer Control Switch. Depending which direction the
operator wishes to travel (crab), the steering wheel is turned
in the same direction as the Rear Steer Control Switch. This
permits driving crane forward or backward in a crabbing
manner.
Four-Wheel Drive Operation
If more traction is required due to slipping or spinning
wheels, engage front axle drive as follows:
1. Stop crane by pressing Service Brake Foot Pedal.
2. Position Transmission Shift Lever to neutral (N) position.
3. Position Drive Axle Selector Switch to four-wheel drive.
NOTE: If Drive Axle Selector Switch is positioned to
four-wheel drive, Service Brake Foot Pedal is not
pressed, and Transmission Shift Lever is not in
neutral (N) position Four-Wheel Drive Indicator will
flash and four-wheel drive function will not engage.
4. Select gear speed and direction of travel with Transmission
Shift Lever and Knob.
5. Drive crane following Traveling — Forward, page 4-19.
6. Return Drive Axle Selector Switch to two-wheel drive
position as soon as two-wheel traction will suffice and
crane motion has stopped. Service Brake Foot Pedal
must be pressed and Transmission Shift Lever must be
in Neutral (N) position to shift from four-wheel drive to
two-wheel drive.
WARNING
Rollover Hazard!
Operate rear steer ONLY at slow speeds. Operation of
rear steer at high speed may result in loss of steering
control and/or rollover of the crane. Death or serious
injury could occur.
CAUTION
Machine Damage Hazard!
Do not tow or pull in 1st gear with Drive Axle Selector
Switch in two-wheel drive position. Severe damage to
drive train will result. Always engage four-wheel drive.
CAUTION
Possible Machine Damage!
Before shifting from two-wheel drive to four-wheel drive
(or from four back to two), crane travel must be stopped.
Front-Wheel
Rear Wheel
Four-Wheel Crabbing
FIGURE 4-5
6402-1
6402-2
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