Manitowoc 777 Service And Maintenance Manual

Reference Only
POWER TRAIN 777 SERVICE MANUAL
7-12 Published 10-01-2012, Control # 045-08
ENGINE DIAGNOSTICS – CUMMINS QSL 340
AND QSC8.3 ENGINE
The Cummins QSC8.3 and 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 the
operator to engine problems during operation (engine
running) and fault codes to identify specific problems
when the engine is not running.
Onboard Diagnostics
The Engine Stop, Engine Warning, and Engine Maintain
lights are mounted on the front console in the operator’s cab
as shown in Figure 7-8.
Engine Stop Light
When on, the red Engine Stop light indicates the need to
stop engine as soon as safely possible.
The red Engine Stop light and the yellow Engine Warning
light to flash out active fault codes when engine is off.
Engine Warning Light
When on, the yellow Warning light indicates the need to
repair fault at first available opportunity.
Engine Maintain Light
When on, the white Engine Maintain light indicates the need
to perform engine maintenance.
NOTE: The QSL 340 engine does not use an engine
maintenance light.
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:
a. Yellow WARNING light flashes indicating that a fault
code is about to be flashed.
b. There is a 1 to 2-second pause.
c. Red STOP light flashes a three-digit code to show
which active fault has been detected (see
Figure 7-9 for example). There is a 1 to 2-second
pause between each number.
d. When code is finished flashing red, there is a 1 to 2-
second pause and yellow WARNING light flashes
again.
e. Same fault code flashes a second time before
advancing to next code.
See laminated fault codes in operator’s cab.
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 7-8
A1226
R
A
W
A
ENGINE
STOP
ENGINE
WARNING
ENGINE
MAINTAIN
WAIT TO
START
FIGURE 7-9
3 1 9
3 Flashes PAUSE 1 Flash PAUSE 9 Flashes
Fault Code =

Manitowoc 777 Specifications

General

Brand	Manitowoc
Model	777
Category	Construction Equipment
Language	English