Manitowoc 777 User Manual

Reference Only
OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-10 Published 10-01-12, Control # 044-05 v2
CONTROLS IDENTIFICATION AND
FUNCTION
See Figure 3-4 for following instructions.
A – Power Controls
A1. Engine Ignition Switch
Insert key and rotate CLOCKWISE to RUN position to turn
on the crane’s electric system.
Rotate fully CLOCKWISE to START engine. RELEASE to
RUN position as soon as engine starts. For QSC8.3 or QSL
340 engine, wait for WAIT-TO-START light to go out before
starting engine.
Rotate COUNTERCLOCKWISE to STOP engine and to turn
off crane’s electric system.
NOTE: Stopping engine in an emergency causes all
brakes to apply and any functions being operated
to stop — beware that functions stop abruptly.
B – Engine Controls
B1. Engine Warning/Diagnostic Lights
Refer to Engine Diagnostics in Section 10 of the Crane
Service Manual for instructions.
NOTE: To active engine fault codes: (1) STOP engine; (2)
move ignition switch to RUN position; and (3) move
hand throttle forward and back three times in
succession.
B2. Ether Starting Aid Switch (for 6CTA8.3-C260 or
QSL 340 engine only)
Press and hold TOP of rocker for approximately three
seconds to FILL starting aid valve with a measured shot of
ether.
RELEASE rocker to DISCHARGE shot of ether into engine
air inlet manifold.
B3. Engine Hand Throttle
Pull handle BACK to INCREASE engine speed.
Push handle FORWARD to DECREASE engine speed.
NOTE: Selected engine speed will be maintained when
handle is released.
Speed of crane functions depends on engine
speed and on how far control handles are moved
from off.
Engine speed must be fast enough to provide
sufficient power for work being done. Engine can
stall under load if engine speed is too slow.
B4. Engine Foot Throttle
PRESS pedal to INCREASE engine speed above hand
throttle setting.
RELEASE pedal to DECREASE engine speed to low idle or
to hand throttle setting.
B5. Engine Clutch Pedal
Refer to Figure 3-12 for pedal operation.
Push pedal DOWN and FORWARD to DISENGAGE clutch.
Push pedal REARWARD and UP to ENGAGE clutch.
See Engine Start-Up for precautions.
B6. Emergency Engine Stop Switch
Push knob DOWN to STOP engine only in an emergency —
for example, if a crane function does not stop when control
handle is released to off (center position) or any other
uncontrolled motion of a crane function is observed.
Beware — when knob is pushed down, engine stops, brakes
apply, and any functions being operated come to an
abrupt stop.
NOTE: Knob must be pulled up before restarting engine.
If the emergency stop switch has been activated,
test all disk brakes for proper operation before
putting the crane back in service. See Section 2 of
Service Manual for procedure.
WARNING
Unauthorized Start-Up!
Always STOP engine and remove key before leaving
crane unattended. This practice will prevent unauthorized
personnel from operating crane.
DANGER
Explosion Hazard – QSC8.3 or QSL 340 Engine!
To avoid engine damage, do not use starting-aid fluids.
This engine is equipped with an intake pre-heater. Using
starting-aid fluids can cause an explosion and severe
burns to personnel.
CAUTION
Engine Damage!
Using too much ether can damage engine. See engine
manual for cold weather starting instructions and
precautions.

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English