Manitowoc Published 10-01-12, Control # 044-05 v2 3-11
777 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
3
NOTE: Use engine ignition switch (A1) to stop engine for
normal operating conditions.
B7. Battery Disconnect Switch
Turn disconnect handle CLOCKWISE to CONNECT battery
circuit.
Turn disconnect handle COUNTERCLOCKWISE to
DISCONNECT battery circuit for the following reasons:
• When servicing crane’s electrical control system.
• If desired, to prevent batteries from discharging when
the crane is stored for extended periods of time.
• If desired, to prevent crane from being started by
unauthorized personnel.
The handle can be removed in the out when in the
disconnect position to keep unauthorized personnel from
connecting the batteries and starting the crane.
C – Accessory Controls
C1. Dome Light Switch
Dome light has a two-position switch with on and off settings.
The dome light can be rotated to different positions.
C2. Panel Light Switch
Press TOP of rocker to TURN ON panel lights.
Press BOTTOM of rocker to TURN OFF panel lights.
C3. Heater/Air Conditioner Fan Switch
This fan operates only when heater or air conditioner is on.
Press TOP of rocker to TURN ON fan at high speed.
Press BOTTOM of rocker to TURN ON fan at low speed.
C4. Horn Switch
PRESS and hold button to TURN ON horn. Sound horn
when necessary to warn or signal personnel while crane is
being operated or serviced.
RELEASE button to TURN OFF horn.
C5. Air Conditioner Temperature Selector
Rotate knob clockwise for cooler temperatures and
counterclockwise for warmer temperatures.
C6. Air Conditioner/Heater Switch
Press TOP of rocker to TURN ON cab heater.
CENTER rocker to TURN OFF cab air conditioner or heater.
Press BOTTOM of rocker to TURN ON cab air conditioner.
NOTE: The shut-off valves in heater hoses (Figure 3-5) at
engine must be open for heater operating.
The shut-off valves can be closed to block hot
water flow through heater core during warm
weather.
The shut-off valve in the supply line can be partially
opened and closed to regulate heat.
C7. Front Windshield Wiper Switch
C8. Overhead Windshield Wiper Switch
Press TOP of rocker to TURN ON wiper and operate it in
HIGH SPEED.
CENTER rocker to TURN ON wiper and operate it in LOW
SPEED.
Press BOTTOM of rocker to TURN OFF wiper.
C9. Defroster Fan
Defroster fan has a three-position switch with off, low, and
high settings.
C10. Tinted Visor
Move to desired position to shade sun light.
C11. Machinery Heaters
To aid starting in cold weather, plug in heaters at shut-down;
unplug heaters at start-up.
The hydraulic tank can be equipped with two thermostatically
controlled heaters (120 V or 240 V), designed to keep oil
temperature 30°F (17°C) warmer than ambient temperature.
CAUTION
Engine Damage!
To avoid possible engine fault codes and undesirable
operation, make sure engine ignition switch has been off
two minutes before disconnecting batteries.
Do not rely on this switch to protect crane’s electronic
systems when welding. Disconnect battery cables at
batteries before welding.
P453a
Shut-Off Valves
Return
Hose
Supply
Hose
Left Side of Engine
FIGURE 3-5
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