JLG 600A_AJ Service Manual - Manual (Page 119)

SECTION 3 - CHASSIS & TURNTABLE
3121201 – JLG Lift – 3-69
3.14 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.
3.15 DUAL FUEL SYSTEM
IT IS POSSIBLE TO SWITCH FROM ONE FUEL SOURCE TO THE
OTHER WITHOUT ALLOWING THE ENGINE TO STOP. EXTREME
CARE MUST BE TAKEN AND THE FOLLOWING INSTRUCTIONS
MUST BE FOLLOWED.
Changing from Gasoline to LP Gas
1. Start the engine from the ground control station.
2. Open the hand valve on the LP gas supply tank by
turning counterclockwise.
BE SURE ALL GASOLINE IS EXHAUSTED BEFORE SWITCHING TO
LP GAS.
3. While the engine is operating, place the three posi-
tion LPG/Gasoline switch at the ground control sta-
tion to the center “off” position. Allow the engine to
operate without load, until the engine begins to
“stumble” from lack of gasoline.
4. As the engine begins to “stumble”, place the switch
to the LPG position, allowing the LP fuel to be sent
to the fuel regulator.
Changing from LP Gas to Gasoline
1. With engine operating on LP under a no load condi-
tion, throw the LPG/Gasoline switch at the ground
control station to the “Gasoline” position.
2. If engine “stumbles” because of lack of gasoline,
place the switch to the LPG position until engine
regains smoothness, then return the switch to the
Gasoline position. Repeat as necessary until engine
runs smoothly on gasoline.
3. Close the hand valve on the LP gas supply tank by
turning clockwise.
3.16 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.