JLG 660SJ Service Manual - Manual (Page 109)

SECTION 3 - CHASSIS & TURNTABLE
3121202 – JLG Lift – 3-59
3.12 SPARK ARRESTER CLEANING
INSTRUCTIONS
1. Remove the cleanout plug in the bottom of spark
arrester (muffler).
2. Without causing deformation (or any type of dam-
age to the spark arrester) repeatedly tap on the
arrester near the cleanout plug. This may be enough
to begin drainage of the spark trap.
3. An industrial vacuum cleaner can do a complete job
at this point.
a. Or, IN A SAFE AREA, start the engine. Then
alternate between low idle and high idle for two
to three minutes.
b. Or, operate the engine as required by the appli-
cation for two to three minutes.
4. Install the cleanout plug.
3.13 GLOW PLUGS
If the glow plug option is enabled in the JLG Control Sys-
tem, the glow plug and indicator lamp will be energized
when the Power/Emergency Stop switch is pulled on if the
ambient air temperature is less than 50° F (10° C) and the
engine coolant temperature is less than 140° F (60° C).
This determination will occur one second after the Power/
Emergency Stop switch has been pulled on. The lamp
and glow plugs will remain energized for the period of
time specified by the setting in the JLG Control System.
Engine start shall be disabled during this period. On Deutz
engines, the glow plugs will continue (post glow) after the
engine has started for three times the machine digit set-
ting.
3.14 FORD EFI ENGINE
Performing Diagnostics
1. Verify the complaint and determine if it is a deviation
from normal operation.
2. Once the complaint has been verified, preliminary
checks can be done. Conduct a thorough visual
inspection, be alert for unusual sounds or odors,
and gather diagnostic trouble code information.
3. Perform a system check that will verify the proper
operation of the system in question and check for
recent information updates.
4. If a diagnostic trouble code (DTC) is stored, contact
a JLG distributor to make an effective repair.
5. If no DTC is stored, select the symptom from the
symptom tables and follow the diagnostic path or
suggestions to complete the repair.
6. After the repair has been made and validated for
proper operation, the old part should be momen-
tarily re-installed to verify that it was indeed the
source of the problem.
If no matching symptom is available, analyze the com-
plaint and develop a plan for diagnostics utilizing the wir-
ing diagrams, technical assistance, and repair history.
Intermittent conditions may be resolved by using a check
sheet to pinpoint the circuit or electrical system compo-
nent. Some diagnostic charts contain Diagnostic Aids
which give additional information about a system. Be sure
to use all of the information that is available to you.