JLG 24RS Service Manual - Manual (Page 89)

SECTION 3 - CHASSIS & TURNTABLE
3121287 – JLG Lift – 3-51
3.11 COLD START SYSTEM
The JLG Control System monitors the engine coolant and
ambient temperature to determine cylinder preheating
requirements. If the coolant temperature is below 65° C when
control power is turned on, the glow plugs will be automati-
cally activated for a period of time based on the ambient tem-
perature up to a maximum of 20 seconds. During this preheat
period, the glow plug indicators on the control consoles will
flash. The operator should wait for the glow plugs to complete
their cycle before cranking the engine.
3.12 ENGINE OPERATING STATES
The Engine Operating State is determined by the Ground
Module. There are four different Engine Operating States
which include;
• Engine Stopped
• Engine Cranking
• Engine Starting
• Engine Running
ENGINE
STOPPED
ENGINE
RUNNING
ENGINE
CRANKING
ENGINE
STARTING
(RPM greater than 800 for 1/4 second)
(RPM greater than
800 for 1/4 second)
(RPM = 0 for 1/2 second)
(RPM = 0 for 1/2 second)
(Engine RPM = 0)
(RPM greater than 800 for 1/4 second)
(Engine Starter Not Engaged
& Engine RPM greater than 0)
(Engine Starter Engaged
& Engine RPM greater than 0)
Figure 3-38. Engine Operating State Diagram