Manitowoc Published 10-01-12, Control # 044-05 v2 3-27
777 OPERATOR’S MANUAL OPERATING CONTROLS AND PROCEDURES
3
3. Move cab power switch to ON. For QSC8.3 or QSL 340
engine WAIT TO START will appear on digital display
indicating that pre-heaters are warming engine’s air
intake. Don’t try to start engine until this line disappears
from display (4-5 seconds).
4. Move engine run/stop switch to RUN.
NOTE: The operating limit alert and the system fault alert
(lights, buzzer, beeper) should come on for three
seconds when the run/stop switch is moved to run;
if not, replace defective parts.
5. If ambient temperature is below 40°F (4°C), disengage
engine clutch, as shown in Figure 3-12. This step will
disconnect the pumps from the engine and aid in cold
weather startup.
6. Turn ignition switch to START.
NOTE: A starting aid may be required when the outside air
temperature is below 20°F (-7°C). See engine
manual for cold weather starting instructions and
safety precautions.
7. Increase engine speed as necessary to keep engine
running after it starts. Allow engine to run until it begins
to warm-up.
8. If disengaged, set engine speed at 1,300 rpm and
engage engine clutch slowly to give engine time to
take on added hydraulic load.
NOTE: It is normal for engine speed to droop as clutch is
engaged (due to increased load of pumps and
pump drive). If engine stalls, disconnect clutch and
allow a longer warm-up period.
It is also normal for system fault alert and engine
warning/diagnostic lights to come on after engine
starts. Alert and lights should go off as engine oil
pressure, hydraulic oil pressure, and hydraulic oil
temperature rise to normal – if no other faults exist.
Once clutch is engaged (and engine remains
running), decrease engine speed as low as
CAUTION
Pump Damage!
Do not start engine until hydraulic shut-off valves are
open; otherwise, pumps could cavitate and be damaged.
FIGURE 3-12
P450
P451
Engine Clutch Disengaged
Engine Clutch Engaged
CAUTION
Engine Clutch Damage!
To maintain proper engine clutch operation:
• Decrease engine speed to 1,300 rpm before
engaging or disengaging clutch.
• Do not run engine longer than 20 minutes with clutch
disengaged.
• Disengage and engage clutch several times monthly
with engine running.
WARNING
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
Starter Motor Damage!
If engine does not start after 30 seconds of cranking, wait
a few minutes so starter motor cools before trying again
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