Manitowoc Published 10-01-12, Control # 044-05 v2 3-21
777 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
3
K – Travel Controls
Crawlers are equipped with spring-applied, hydraulically-
released disc brakes.
• Both crawler brakes release when either crawler handle
is moved from off.
• Both crawler brakes apply when both crawler handles
are moved to off.
• Both crawler brakes apply to hold the crane in position if
power is lost for any reason.
K1. Right Crawler Handle
K2. Left Crawler Handle
NOTE: The following directions of travel are with crawler
drive shafts to rear of operator.
Move handle to FRONT to travel FORWARD. Speed
increases in relation to handle movement.
Release handle to CENTER to STOP traveling.
Move handle to REAR to travel in REVERSE. Speed
increases in relation to handle movement.
NOTE: If equipped, optional travel alarm will beep to warn
personnel when crane is traveled in either
direction.
K3. Travel Detent Selector
NOTE: Travel detent selector allows crawlers to be
operated in either direction at a selected speed
without operator’s hand on crawler handles.
Move both crawler handles in either direction from off to
select desired speed and direction of travel. PULL UP and
release KNOB on right crawler handle to TURN ON the
travel detent. Release handles to off. The crawlers will
continue to travel at selected speed and direction.
Slightly move either crawler handle in opposite direction or
pull up and release knob on right handle to TURN OFF travel
detent.
K4. Travel Park Switch
The travel park switch enables and disables travel operation.
With travel park on, the travel handles (or pedals) are
inoperable and the travel brakes are applied.
Press TOP of rocker to TURN ON travel park.
Press BOTTOM of rocker to TURN OFF travel park (allow
travel to be operated).
K5. Right Crawler Pedal
K6. Left Crawler Pedal
For cranes equipped with crawler pedals, pedals take the
place of crawler handles — no travel detent is available.
NOTE: The following directions of travel are with crawler
motors to rear of operator.
Tilt pedal to FRONT to travel FORWARD. Speed increases
in relation to pedal movement.
Release pedal to CENTER to STOP traveling.
Tilt pedal to REAR to travel in REVERSE. Speed increases
in relation to pedal movement.
K7. Travel Speed Selector
Press top end of rocker to operate travel motors in HIGH
speed. High speed operation provides maximum available
travel speed for traveling long distances.
Press BOTTOM end of rocker to operate travel motors in
LOW speed. Low speed operation provides smoother starts
and stops and more precise control of the travel motors than
high speed.
In low speed, travel motors operate at approximately 1/3 the
speed of high speed.
NOTE: It is okay to change travel speed while traveling:
The travel motors will shift immediately from high to
low when low speed is selected.
The travel motors will not shift from low to high
when high speed is selected until:
• Engine speed is at high idle.
• Hydraulic pressure is low enough to allow
motors to shift from low to high speed.
REMOTE CONTROLS
The following remote controls are provided for setup:
• Counterweight remote control in left side enclosure.
• Carbody jack handles on front of carbody.
• Crawler connecting pin handles on front of carbody.
See Remote Controls in this section for operating
instructions.
CAUTION
Swing Drive/Boom Damage!
Do not apply swing holding brake or turn on swing park
while swinging; brake will bring rotating bed to an abrupt
stop. This action could cause damage to boom from side
loading or damage to swing drive from shock loading.
Bring rotating bed to smooth stop with swing handle and
then apply swing holding brake or turn on swing park.
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