JLG 600A Service And Maintenance Manual page 165

STEP
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?
14 Using a DVOM, check the resistance of the low pressure lock-off (LPL).
Is the resistance within the specified range?
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?
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?
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?
18 The fuel supply system or hoses are plugged or restricted, locate and repair the
problem.
Is the action complete?
19 Replace the fuel filter. Refer to Fuel Filter Replacement.
Is the action complete?
20 Repair the open in the lock-off ground circuit.
Is the action complete?
21 Repair the open in the lock-off power circuit.
Is the action complete?
22 Replace the low pressure regulator (LPR). Refer to Low Pressure Regulator
Replacement.
Is the action complete?
23 Replace the lock-off. Refer to Lock-off Replacement.
Is the action complete?
24 Replace the mixer assembly. Refer to Fuel Mixer Replacement.
Is the action complete?
3121201
Table 3-12. LPF Fuel System Diagnosis
ACTION
– JLG Lift –
SECTION 3 - CHASSIS & TURNTABLE
VALUE(S) YES
- - Go to Step 14
12W - 16W Go to Step 15
- - Go to Step 23
- - Go to Step 20
- - Go to Step 19
- - Go to Step 26
- - Go to Step 26
- - Go to Step 26
- - Go to Step 26
- - Go to Step 26
- - Go to Step 26
- - Go to Step 26
NO
Go to Step 16
Go to Step 23
Go to Step 17
Go to Step 21
Go to Step 18
- -
- -
- -
- -
- -
- -
- -
3-115