JLG 340AJ, Service And Maintenance Manual

Page: 112 / 370

SECTION 3 - CHASSIS & TURNTABLE
3-70 – JLG Lift – 3121259
3.13 ENGINE START CONDITIONS
Engine starting is controlled by the Ground Module. The
Ground Module will allow the starter to be engaged and keep
the starter energized if all of the following conditions are satis-
fied.
1. The Start Switch is selected.
a. Ground Mode is active with Ground Module input
J4-4 energized
or
b. Platform Mode is active with Platform Module input
J1-14 energized.
2. The selected Operating Station must have all of its con-
trol switches in the neutral position since power up and
remain in the neutral position prior to selecting the Start
Switch.
3. If operating from the Platform Station, the footswitch
must not be depressed (Ground Module J7-15 deener-
gized; Platform Module J7-8 energized) before selecting
the Start Switch.
4. If operating from the platform, the Auxiliary Power
Switch must not be selected before selecting the Start
Switch.
5. If operating from the ground station, the Function
Enable Switch must not be selected before selecting the
Start Switch.
6. If the Engine Starter was disengaged because the Start
Switch was released, more than 3 seconds must pass
with the Start Switch in the released position.
7. If the Engine Starter has been cranking without the
engine starting for the Engine Starter Engaged Time
Limit, the control system deenergizes the Engine Starter
for the Engine Restart Wait Period. The Start Switch must
be in the deselected position after the Wait Period is
over.
8. The engine must be in the Engine Stopped or Engine
Cranking state.
9. The Engine Shutdown switch must not be activated.
10. The Start Switch has been in the deselected position
after the Engine State changes to Engine Stopped from
Engine Running or Engine Starting.
3.14 ENGINE RPM LEVELS
NOTE: The RPM levels are set in the Analyzer Personalities menu.
The engine operates at different RPM levels in order to prop-
erly operate the machine and the functions commanded by
the operator. The following lists the possible RPM levels and
the operating conditions that control them.
Engine Stop RPM
Engine Stop RPM is always zero (0) and occurs when the
engine operating state is Engine Stopped or when the opera-
tor shuts down the engine.
Idle RPM
Idle RPM occurs when all of the following conditions exist;
1. The Engine State is Engine Running, Engine Cranking, or
Engine Starting.
2. The operator is not shutting down the engine.
3. The control system is not commanding a higher engine
RPM (Mid-Engine, Multi-function, or High Engine).
4. The control system is not calling for Generator RPM.
Mid Engine RPM
Mid Engine RPM occurs when all of the following conditions
exist;
1. The Engine State is Engine Running.
2. The operator is not shutting down the engine.
3. The control system is not commanding a higher engine
RPM (Multi-function or High Engine).
4. The control system is not calling for Generator RPM.
5. Platform mode is active with the controls enabled or
Ground mode is active with any function enabled
except for Lift Down, Tower Lift Down, or Jib Lift Down.
Table 3-4. Engine Starter Limits
Engine
Starter Engage
Time Limit
Restart Attempt
Wait Time
Kubota 20 10
GM Indefinite Indefinite
Table 3-5. Engine RPM Levels
Engine Idle RPM
Mid
Engine
RPM
Multi-
Function
RPM
High
Engine
RPM
Kubota 1200 1800 2400 3000
GM 1200 1800 2400 3000