JLG 18RS Service Manual - Manual (Page 79)

SECTION 3 - CHASSIS & TURNTABLE
3121284 – JLG Lift – 3-41
Glow Plugs
The diesel engine has glow plugs, controlled by the ground
module to assist in cold starting.
The Ground Module calculates the length of time the glow
plugs are energized prior to startup based upon ambient tem-
perature, engine coolant temperature, and battery voltage.
Refer to Table 3-5, Glow Plug Conditions.
The glow plugs are deenergized if:
• The Engine State is Engine Cranking, Engine Starting,
Engine running
or
• The Emergency Descent Mode is activated and Lift Down,
Tower Lift Down, or Jib Lift Down are active.
If the STARTER LOCKOUT option is enabled in the Machine
Setup, the Ground Module will not allow an engine start
attempt until the glow plug time has expired. If this option is
not enabled, the glow plug time can be interrupted and an
engine start attempt can be made. Starter Lockout is only
applicable for the first glow plug cycle.
Ambient Air Temperature Sensor
The ambient air temperature sensor is integrated within the
Ground Module. The sensor provides temperature information
the engine control system uses to set its fuel, spark, and air set-
tings for engine starting in cold environments.
3.15 COUNTERWEIGHT
If the counterweight has been removed, ensure the retaining
bolts are torqued to the proper value as shown in Figure 3-14.,
Counterweight Bolt Torque.
NOTE: The left counterweight weighs approximately 937.6 ± 30.8
lbs. (425.3 ± 14 kg) and the right counterweight weighs
approximately 937.2 ± 30.8 lbs. (425.1 ±14 kg). Actual
weight is stamped on the counterweight.
Table 3-5. Glow Plug Conditions
Engine Coolant
Temperature
Battery
Voltage Ambient
Temperature
Glow Plug
Time On
Greater than or
equal to
122 º F (50 º C)
- - - - Off
- - Less than 11V - - Off
Less than
122 º F (50 º C)
Greater than
11V
Greater than
59ºF(15ºC)
Off
Less than
122 º F (50 º C)
Greater than
11V
Temp Between
23ºF and 59ºF
(-5ºC and 15ºC)
On for
10 sec.
Less than
122 º F (50 º C)
Greater than
11V
Temp Between
5ºF and 23ºF
(-15ºC and -5ºC)
On for
15 sec.
Less than
122 º F (50 º C)
Greater than
11V
Temp Less
Than
5ºF (-15ºC)
On for
20 sec.