JLG G6-42A Service Manual - Manual (Page 114)

Transmission
6-12 G6-42A, G9-43A, G10-43A
5. Transmission overheating
(oil above 248° F (120° C)).
1. Low oil level. 1. Fill transmission oil to correct
level. Refer to Section 2.4,
“Fluid and Lubricant Capacities.”
2. Clogged radiator. 2. Remove debris from the
radiator.
3. Transmission filled with incorrect
oil, or oil contaminated.
3. Drain transmission and fill oil to
correct level. Refer to Section
2.4, “Fluid and Lubricant
Capacities.”
4. Excessive “roading.” 4. Stop and idle the engine.
5. Restriction in oil cooler hoses. 5. Replace cooler hoses.
6. Pump worn or damaged. 6. Repair or replace pump
assembly.
7. Engine thermostat stuck. 7. Replace engine thermostat.
Refer to Section 7.4.2,
“Thermostat Replacement.”
8. Thermal by-pass valve
damaged or flow restricted.
8. Replace thermal by-pass valve.
Refer to Section 6.6,
“Transmission Cooler Thermal
Bypass Valve.”
6. Grinding or “clunking” noise
from transmission.
1. Oil level too low. 1. Fill transmission oil to correct
level. Refer to Section 2.4,
“Fluid and Lubricant Capacities.”
2. Transmission filled with incorrect
oil.
2. Drain transmission and fill oil to
correct level. Refer to Section
2.4, “Fluid and Lubricant
Capacities.”
3. Incorrect clutch engagement. 3. Refer to Section 9.11.3,
“Transmission Solenoid Valves.”
4. Internal damage. 4. Repair or replace parts as
needed.
5. Broken drive plate. 5. Replace drive plates. Refer to
Section 6.5, “Engine Drive
Plate.”
6. Loose drive plate mounting
capscrews.
6. Tighten capscrews.
Problem Cause Remedy