OPERATING CONTROLS AND PROCEDURES RT9130E-2 OPERATOR MANUAL
3-40 Published 3-1-2018, Control # 559-03
FOUR-WHEEL DRIVE OPERATION
If more traction is required due to slipping or spinning
wheels, engage the front axle drive as follows:
1. Stop the crane by depressing the Service Brake Foot
Pedal.
2. Position the Transmission Shift Lever to the neutral (N)
position.
3. Position the Drive Axle Selector Switch to four-wheel
low.
NOTE: If the Drive Axle Selector Switch is positioned to
four-wheel low and the Service Brake Foot Pedal is
not depressed or the Transmission Shift Lever is
not in neutral (N) position, the Four-Wheel Drive
Indicator will flash and the four-wheel drive function
will not engage.
4. Select gear speed and direction of travel using the
Transmission Shift Lever and Knob.
5. Drive the crane as described under Traveling —
Forward, page 3-38.
6. Return the Drive Axle Selector Switch to the two-wheel
high position as soon as two-wheel traction will suffice
and crane motion has stopped; again, the Service Brake
Foot Pedal must be depressed and the Transmission
Shift Lever must be in the neutral (N) position to shift
from four-wheel low to two-wheel high.
DIFFERENTIAL LOCK OPERATION
(OPTIONAL)
NOTE: The differential lock will not operate unless the
Drive Selector Switch is in the four-wheel low
position.
General
The purpose of the differential lock is to provide maximum
traction and control on poor road or highway surfaces. When
the differential locks are actuated, the clutch collar
completely locks the differential case, gearing, and axle
shafts together, thus maximizing traction to both wheels of
each axle. The lock position will also protect against spinout.
When normal driving conditions exist (during periods of good
traction), the differential locks should not be actuated. The
axles should be allowed to operate with differential action
between both wheels.
Follow the steps below when engaging/disengaging the
differential lock function.
1. Lock the differentials by pressing and holding the Axle
Differential Control Switch in the lock position;
disengage the function by releasing the switch.
2. Lock/unlock the differentials only when the vehicle is
standing still or moving at a constant low speed with the
wheels not slipping.
3. Locked differentials cause the crane’s turning radius to
increase, creating an understeer condition; use caution,
good judgment and drive at low speeds when operating
the vehicle with locked differentials.
CAUTION
Machine Damage Hazard!
Do not tow or pull in 1st gear with the Drive Axle Selector
Switch in two-wheel drive position. Severe damage to the
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.
CAUTION
Unintended Operation!
When using the differential lock, steering characteristics
may be affected with possible loss of control.
Try to use four-wheel drive to gain adequate traction
before using the differential lock.
Do not operate the differential lock when traveling
downhill; at speeds above 6 km/h (10 mph); on hard, dry
surfaces; and/or during axle spin-out.
CAUTION
Possible Machine Damage!
When driving on hard, dry surfaces with the differentials
locked, do not turn the wheels. Damage to the drive line
components can result.
Do not lock the differentials when the wheels are slipping.
Damage to the differentials can result.
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