Manitowoc Grove CD3340B Service Manual page 168

TRANSMISSION AND TORQUE CONVERTER
Problem
Low Pump Flow
High Converter Out
Pressure
Low Lubrication
Pressure
Low Clutch Pressure
and/or Clutch Slipping
7-12
Possible Cause
1. Low oil level.
2. Blocked suction strainer.
3. Worn pump.
1. Oil cooler/lines blockage.
1. Low mainline pressure.
2. Oil cooler/lines blockage.
3. Ruptured lubrication line.
4. Converter internal leakage.
5. Converter relief valve faulty.
6. Leakage at pump to case
(indicated by low cooler flow.
7. Restriction in converter feed.
1. Low mainline pressure.
2. Worn pump.
3. Blocked restrictor orifice in
solenoid valve block.
4. Clutch seals worn.
5. Clutch piston rings worn.
6. Mechanical failure.
Published 04/07/2015 Control # 569-00
1. Add oil to transmission.
2. Clean suction strainer.
3. Repair or replace the pump.
1. Clean cooler, remove blockage.
1. See problem "Low Mainline Pressure.
2. Clean cooler, remove blockage."
3. Repair line.
4. Check and replace converter.
5. Check, repair or replace the relief valve.
6. Check, replace or repair the pump.
7. See item 10 in problem "OverHeating."
1. See problem "Low Mainline Pressure."
2. Check flow and repair or replace if necessary.
3. Remove solenoid(s) and clear restriction.
4. Confirm with clutch leakage test. Replace seals if worn.
5. Confirm with clutch leakage test. Replace piston rings if
worn.
6. Strip and rebuild clutch. Replace parts as required.
CD3340B/YB4411
Remedy