OPERATING CONTROLS AND PROCEDURES 777 OPERATOR’S MANUAL
3-28 Published 10-01-12, Control # 044-05 v2
possible without stalling engine to give system
fault alert and engine warning/diagnostic lights
time to turn off.
9. Run engine at low idle until hydraulic oil temperature is
at least 60°F (16°C) and all faults are gone.
10. Confirm crane mode in effect or select and confirm
another crane mode. The drums and boom hoist are
inoperable until this step is performed (operating limit
alert will come on and CONFIRM MODE will appear on
digital display if operation is attempted).
Engine Diagnostics
The Cummins QSC8.3 or QSL 340 Engine has two
diagnostic modes:
• Offboard Diagnostics that requires Cummins Insite™
hardware and software, available from your local
Cummins dealer.
• Onboard Diagnostics that uses warning lights to alert
operator to engine problems during operation (engine
running) and fault codes to identify specific problems
when engine is not running.
Onboard Diagnostics
Engine Stop, Engine Warning, and Engine Maintain lights
are mounted on front console in operator’s cab as shown in
Figure 3-13.
Engine Stop Light
When on, red Engine Stop light indicates need to stop
engine as soon as safely possible.
Red Engine Stop light is also used with yellow Engine
Warning light to flash out active fault codes when engine is
off.
Engine Warning Light
When on, yellow Warning light indicates need to repair fault
at first available opportunity.
Engine Maintain Light
When on, white Engine Maintain light indicates need to
perform engine maintenance.
Engine Off Diagnostics
To identify active faults, proceed as follows. A laminated list
of fault codes is located in the operator’s cab.
1. STOP engine.
2. Move key switch to RUN position.
3. Move hand throttle from low speed to high speed and
back to low speed three times within five seconds.
4. If no active faults exist, WARNING and STOP lights
come on but don’t flash.
5. If active faults exist, following occurs:
CAUTION
Avoid Machinery Damage!
Do not operate crane when system fault alert is on. If alert
does not go off soon after engine is started or comes on
during operation, immediately proceed as follows:
• Determine fault on digital display.
• Land loads if possible. Otherwise apply drum pawls
and brakes (if equipped with pedals) and park all
functions.
• Move all control handles to off.
• Stop engine.
• Correct cause of fault.
CAUTION
Machinery Damage!
Continuous operation with hydraulic oil temperature
above 180°F (82°C) can result in damage to hydraulic
components. Troubleshoot hydraulic system if oil
temperature exceeds 180°F (82°C).
WARNING
If possible, lower lifted loads and then stop engine as soon
as possible when stop light comes on. Permanent
damage can occur if engine is run while stop light is on.
Do not run engine until fault is corrected.
FIGURE 3-13
A1226
R
A
W
A
ENGINE
STOP
ENGINE
WARNING
ENGINE
MAINTAIN
WAIT TO
START
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