JLG 4017 Service Manual - Manual (Page 84)

Transmission:
6.8 4017
3. Low clutch pressure. 1. Incorrect oil level.
2. Main pressure valve stuck open.
3. Broken or worn coupling shaft or
piston o-rings.
4. Pressure reducing valve stuck
open.
1. Fill transmission to correct level.
Refer to Section 2.4, “Fluids,
Lubricants and Capacities.”
2. Clean the valve spool and
housing.
3. Replace coupling and/or o-rings.
4. Clean the valve spool and
housing.
4. Lack of power. 1. Park or service brake dragging.
2. Low engine rpm causes
converter stall.
3. Pump output pressure is low.
4. Clutch discs worn or damaged.
5. Transmission overheating.
1. Refer to Section 8.4, “Hydraulic
Circuits.”
2. Adjust the engine rpm to
specifications. Refer to Perkins
Service Manual.
3. Refer to Section 6.7.1,
“Transmission Troubleshooting,”
Problem 2. “Low or no pump
flow or pressure.”
4. Replace clutch discs.
5. Refer to Section 6.7.1,
“Transmission Troubleshooting,”
Problem 5. “Transmission
overheating, oil above 120° C
(248° F).”
5. Transmission overheating,
oil above 120° C (248° F).
1. Low oil level.
2. Clogged radiator.
3. Transmission filled with incorrect
oil, or oil contaminated.
4. Excessive “roading.”
5. Restriction in oil cooler hoses.
6. Pump worn or damaged.
7. Engine thermostat stuck.
1. Fill transmission to correct level.
Refer to Section 2.4, “Fluids,
Lubricants and Capacities.”
2. Remove debris from the
radiator.
3. Drain transmission and fill to
correct level. Refer to Section
2.4, “Fluids, Lubricants and
Capacities.”
4. Stop and idle the engine.
5. Replace cooler hoses.
6. Repair or replace pump
assembly.
7. Replace engine thermostat.
Refer to Section 7.4.2,
“Thermostat Replacement.”
6.7.1 Transmission Troubleshooting (Continued)
Problem Cause Remedy