JLG TF6-42 Service Manual - Manuale (Pagina 731)

T12000 ID 04/99 7-3
7.3 TROUBLESHOOTING GUIDE
Refer to the following troubleshooting guide for the diagnosis of typical transmission troubles.
7.3.1 Low clutch pressure
C AUSE R EMEDY
1. Low oil level. 1. Fill to proper level.
2. Clutch pressure regulating valve stuck open. 2. Clean valve spool and housing.
3. Faulty charging pump. 3. Replace pump.
4. Broken or worn clutch shaft or piston sealing rings. 4. Replace sealing rings.
5. Clutch piston bleed valve stuck open. 5. Clean bleed valves thoroughly.
7.3.2 Low charging pump output
C AUSE R EMEDY
1. Low oil level. 1. Fill to proper level.
2. Suction screen plugged. 2. Clean suction pump.
3. Defective charging pump. 3. Replace pump.
7.3.3 Overheating
Cause Remedy
1. Worn oil sealing rings. 1. Remove, disassemble, and rebuild converter
assembly.
2. Worn charging pump. 2. Replace charging pump.
3. Low oil level. 3. Fill to proper level.
4. Dirty oil cooler. 4. Clean cooler.
5. Restriction in cooler lines. 5. Change cooler lines.
7.3.4 Noisy converter
Cause Remedy
1. Worn charging pump. 1. Replace charging pump.
2. Worn or damaged bearings. 2. A complete disassembly will be necessary to
determine which bearing is faulty.
7.3.5 Lack of power
Cause Remedy
1. Low engine RPM at converter stall. 1. Tune engine check governor.
2. See “Overheating” and make same checks. 2. Make corrections as explained in “Overheating”.
Troubleshooting guide