Manitowoc CD15 Operator's Manual page 71

CD15 OPERATOR MANUAL
NOTE: If the rear wheels do not track with the front wheels
in the two-wheel steer mode, the steering sync
switch can be used to re-center the rear wheels.
See 6 – Steering Sync Switch on page 3-5
2. Four-Wheel Steer Mode.
See Figure 3-22 for the following procedure.
NOTE: DO NOT travel at high speed with the crane in the
four-wheel steer mode. Possible tipping may occur
when turning.
The front wheels steer in the direction that the steering
wheel is turned and rears wheels turn in the opposite
direction. This mode allows for an extremely short
turning radius. It enables the rear wheels to follow the
track of the front wheels. This is an advantage in muddy
or sandy conditions.
a0565
Four-Wheel Steer Mode
3. Crab Steer Mode
See Figure 3-23 for the following procedure.
NOTE: DO NOT travel at high speed with the crane in the
crab steer mode. Possible tipping may occur when
turning.
All of the wheels steer in the same direction. This mode
permits the operator to move the crane sideways for
short distances. This feature is especially helpful in
repositioning the crane in tight areas.
a0566
Crab Steer Mode
OPERATING CONTROLS AND PROCEDURES
Four-wheel Steering Indexing Procedure
Use this procedure whenever a steering mode cannot be
properly selected.
1. Switch to the four-wheel steer mode.
2. Turn the steering wheel until the rear wheels are aligned.
3. Once the rear wheels are aligned, switch to the two-
wheel steer mode.
4. Next, switch back to the four-wheel steer mode or to the
crab steer mode.
The steering mode valve will shift to the four-wheel steer
mode or to the crab steer mode once the steering wheel
is turned so that the front wheels are aligned. This will
allow the user to align the wheels for the desired
steering mode.
NOTE:
FIGURE 3-22
Changing Travel Direction
1. The crane must come to a complete stop before
changing travel direction.
2. Move the travel select lever to the opposite travel
direction.
NOTE:
NOTE:
FIGURE 3-23
Published 3-30-2018, CTRL 636-05
If the rear wheels happen to get out of alignment
while in the two-wheel steer mode, the user will not
be able to switch back to four-wheel steer mode or
to the crab steer mode without using the steer
synchronize switch.
This will manually switch the steering mode valve
to the four-wheel steer mode, allowing the user to
align the rear wheels while in two-wheel steer
mode. After this, the steer synchronize switch can
be released and the steer mode switch can then be
changed to four-wheel steer mode or to the crab
steer mode.
To avoid possible damage to the transmission DO
NOT attempt to start the engine by pushing or
towing with another vehicle. The power train does
not allow starting this way, and transmission
damage may occur.
The following practices could result in transmission
failure:
• Shifting between forward and reverse while the
engine is at high speed or heavy throttle, such
as when the driving wheels are in mud or snow
– commonly called rocking.
• Shifting to reverse or forward while operating
the engine at high speed in neutral.
• Operating the transmission at or near "stall
speed" for more than 10 seconds at a time.
"Stall condition" is when the engine runs at
high speed while the transmission is in forward
3
3-13