JLG 600A_AJ Service Manual User Manual
Page 165
SECTION 3 - CHASSIS & TURNTABLE
3121201
– JLG Lift –
3-115
13
1. Turn OFF the ignition.
2. Disconnect the LPL connector.
3. Install a test light between the pins of the LPL connector.
4. Crank the engine. The test light should illuminate.
Does the test light illuminate?
- -
Go to Step 14
Go to Step 16
14
Using a DVOM, check the resistance of the low pressure lock-off (LPL).
Is the resistance within the specified range?
12W - 16W
Go to Step 15
Go to Step 23
15
1. Turn the ignition OFF.
2. Close the manual shut-off valve on the LPG tank.
CAUTION: When disconnecting LPG fuel lines, liquid LPG may be present. Per-
form this step in a well ventilated area.
3. Loosen the fuel inlet hose fitting at the inlet of the LPL.
Was fuel present when the fitting was loosened?
- -
Go to Step 23
Go to Step 17
16
1. Turn OFF the ignition.
2. Connect the test light to chassis ground and probe pin A of the LPL connector.
3. Crank the engine. The test light should illuminate.
Does the test light illuminate?
- -
Go to Step 20
Go to Step 21
17
1. Remove the LPG fuel filter / LPL.
2. Remove the filter from the LPL.
3. Empty the contents of the inlet side of the LPG fuel filter onto a clean surface.
4. Inspect the contents of the LPG fuel filter for an excessive amount of foreign
material or water. If necessary, locate and repair the source of contamination.
5. Verify the LPG fuel filter is not restricted or plugged.
Was a problem found?
- -
Go to Step 19
Go to Step 18
18
The fuel supply system or hoses are plugged or restricted, locate and repair the
problem.
Is the action complete?
- -
Go to Step 26
- -
19
Replace the fuel filter. Refer to Fuel Filter Replacement.
Is the action complete?
- -
Go to Step 26
- -
20
Repair the open in the lock-off ground circuit.
Is the action complete?
- -
Go to Step 26
- -
21
Repair the open in the lock-off power circuit.
Is the action complete?
- -
Go to Step 26
- -
22
Replace the low pressure regulator (LPR). Refer to Low Pressure Regulator
Replacement.
Is the action complete?
- -
Go to Step 26
- -
23
Replace the lock-off. Refer to Lock-off Replacement.
Is the action complete?
- -
Go to Step 26
- -
24
Replace the mixer assembly. Refer to Fuel Mixer Replacement.
Is the action complete?
- -
Go to Step 26
- -
Table 3-12. LPF Fuel System Diagnosis
STEP
ACTION
VALUE(S)
YES
NO