Manitowoc GROVE RT890E Operator's Manual page 52

OPERATING CONTROLS AND PROCEDURES
Traveling - Forward
CAUTION
Engage the swing lock pin for extended travel.
1. After the engine has warmed up, position the
transmission shift lever from neutral (N) to forward (F)
position.
2. Position the DRIVE AXLE switch to either 2WD-HI or
4WD-LO.
CAUTION
Use four wheel drive only when more traction is required.
NOTE: If service brake hydraulic accumulator pressure is
low, the parking brake cannot be released.
3. Put the transmission shift lever knob to the forward (F)
and first (1) gear position and release the parking brake.
Depress the foot throttle until maximum first gear speed
is attained and shift into the second (2) gear position.
4. Repeat the above procedure for the third (3) gear
position.
CAUTION
Do not downshift to a lower gear if the road speed is
greater than the maximum speed of the lower gear.
Traveling - Reverse
Traveling in reverse is accomplished the same way as
traveling forward, except for shifting the transmission shift
lever to reverse (R) position and rotating the knob to the 1, 2,
and 3 positions. (Refer to TRAVELING - FORWARD.)
3-16
CAUTION
Apply service brakes and bring crane to a complete stop
before shifting transmission into reverse.
Four-Wheel Drive Operation
If more traction is required due to slipping or spinning
wheels, engage the front axle drive as follows:
CAUTION
Before shifting from two-wheel drive to four wheel drive
(or from four back to two), crane travel must be stopped.
1. Position the DRIVE AXLE selector switch to 4WD-LO.
2. Select gear speed and direction of travel.
3. Return the DRIVE AXLE selector switch to the 2WD-HI
position as soon as two-wheel traction will suffice and
crane motion has stopped.
Proper Operation of Differential Lock
CAUTION
When using the differential lock, steering characteristics
may be affected.
CAUTION
Try to use four wheel drive to gain adequate traction
before using the differential lock.
CAUTION
Do not operate the differential lock while the crane is
moving; when traveling downhill; at speeds above 10
mph; on hard, dry surfaces; during axle spin-out.
NOTE: The differential lock will not operate unless the
DRIVE selector switch is in the 4WD-LO 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
RT890E