JLG 4394RT - Page 133

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3121642 – JLG Lift – 3-93
Fuel System Checks • Check for Rich or Lean symptom that causes the condition. Drive the vehicle at the speed of the complaint. Monitoring the oxygen sen-
sors will help identify the problem.
• Check the fuel pressure while the condition exists. Refer to LPG Fuel System Diagnosis.
• Verify proper fuel control solenoid operation.
• Verify that the LPG manual shut-off valve is fully open.
• Check the in-line fuel filter for restrictions.
Ignition System Checks • Check for the proper ignition output voltage using the spark tester J26792 or the equivalent.
• Verify that the spark plugs are correct for use with LPG (R42LTS).
• Check the spark plugs. Remove the plugs and inspect them for the following conditions:
- Wet plugs
- Cra cks
- Wear
- Impro pe r g ap
- Burned electrodes
- Heavy deposits
- Chec k th e Cr an ks haft Positio n (C KP ) s en so r
Additional Check • Check the ECM grounds for being clean, tight, and in their proper locations.
• Check the generator output voltage.
• Check the vacuum hoses for kinks or leaks.
• Check Transmission.
Table 3-14. Symptom Diagnosis
Checks Action