JLG G12-55A AccuPlace Service Manual - Manual (Page 75)

6.9 G10-55A & G12-55A AccuPlace
Transmission
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 6.6.1,
“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 6.6.1,
“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. 1. Fill transmission to correct level
with Mobilfluid 424 ®
(ISO Grade 46). 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 to
correct level with Mobilfluid 424 ®
(ISO Grade 46). 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 7.2.2,
“Thermostat Replacement.”
Problem Cause Remedy