JLG 660SJ Service Manual - Manual (Page 161)

SECTION 3 - CHASSIS & TURNTABLE
3121202 – JLG Lift – 3-111
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.
Perform 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 connec-
tor.
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 sur-
face.
4. Inspect the contents of the LPG fuel filter for an excessive amount of for-
eign material or water. If necessary, locate and repair the source of contami-
nation.
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 3-11. LPF Fuel System Diagnosis
STEP ACTION VALUE(S) YES NO