JLG 4013PS Service Manual - Manual (Page 94)

Transmission:
6-8 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
2. Low or no pump flow or
pressure.
1. Low oil level. 1. Fill transmission to correct level
with Mobilfluid 424 ® ISO
Grade 46. (Refer to Section 2.4,
“Fluids, Lubricants and
Capacities.”)
2. Transmission filled with incorrect
oil, or oil contaminated.
2. Drain transmission and fill to
correct level with Mobilfluid 424 ®
ISO Grade 46. (Refer Section
2.4, “Fluids, Lubricants and
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 to correct level
with Mobilfluid 424 ® ISO
Grade 46. Refer to Section 2.4,
“Fluids, Lubricants and
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 8.5, “Hydraulic
Schematics.”
2. Low engine rpm causes
converter stall.
2. Adjust the engine rpm to
specifications. Refer to Dana-
Spicer Service Manual.
3. Pump output pressure is low. 3. Refer to Section 6.6,
“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,
“Troubleshooting,” Problem 5.
“Transmission overheating (oil
above 120° C (248° F)).”
Problem Cause Remedy