JLG G6-42A Service Manual - Manual (Page 113)

6-11 G6-42A, G9-43A, G10-43A
Transmission
2. Low or no pump flow or
pressure.
1. Low oil level. 1. Fill transmission oil to correct
level. Refer to Section 2.4,
“Fluid and Lubricant Capacities.”
2. Transmission filled with incorrect
oil, or oil contaminated.
2. Drain transmission and fill oil to
correct level. (Refer to Section
2.4, “Fluid and Lubricant
Capacities.”)
3. Pump suction pipe screen
clogged.
3. Clean, repair and/or replace
suction pipe.
4. Central shaft damaged. 4. Replace central shaft.
5. Pump worn or damaged. 5. Repair or replace pump
assembly.
3. Low clutch pressure. 1. Incorrect oil level. 1. Fill transmission oil to correct
level. Refer to Section 2.4,
“Fluid and Lubricant Capacities.”
2. Main pressure valve stuck open. 2. Clean the valve spool and
housing.
3. Broken or worn coupling shaft or
piston o-rings.
3. Replace coupling and/or o-rings.
4. Pressure reducing valve stuck
open.
4. Clean the valve spool and
housing.
4. Lack of power. 1. Park or service brake dragging. 1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Low engine rpm causes
converter stall.
2. Adjust the engine rpm to
specifications. Refer to Engine
Service Manual.
3. Pump output pressure is low. 3. Refer to Section 6.7.1,
“Transmission Troubleshooting,”
Problem 2. “Low or no pump
flow or pressure.”
4. Clutch discs worn or damaged. 4. Replace clutch discs.
5. Transmission overheating. 5. Refer to Section 6.7.1,
“Transmission Troubleshooting,”
Problem 5. “Transmission
overheating (oil above 248° F
(120° C)).”
Problem Cause Remedy