General Troubleshooting; Troubleshooting (Electrical) - Manitowoc Grove CD3340B Service Manual

CD3340B/YB4411
TROUBLESHOOTING

General Troubleshooting

Problem
1.
2.
3.
4.
5.
Lack of power
6.
7.
8.
9.
10. Overheating.
1.
2.
3.
4.
Low Mainline
Pressure.
1.
High Stall Speeds (On
all Clutches) 2.
3.
1.
Low Stall Speeds (On
2.
all Clutches)
1.
2.
Low Converter Out
Pressure
3.
4.
GROVE
Possible Cause
Poor engine condition.
Low oil level.
Worn pump.
Torque converter damaged.
Low mainline pressure.
Clutches slipping.
Internal leakage.
High stall speeds.
Low stall speeds.
Worn pump.
Blocked suction strainer.
Pressure maintaining valve
sticking or leaking.
Foaming oil.
Damaged torque converter
blades.
Clutches slipping.
Internal leakage.
Poor engine condition.
Torque converter reaction
member clutch slipping.
Low mainline pressure.
Converter internal leakage.
Converter relief valve faulty.
Restriction in converter feed.
Published 04/07/2015 Control # 569-00
TRANSMISSION AND TORQUE CONVERTER
Remedy
1. Check and repair engine if necessary.
2. Add oil to transmission.
3. Check, repair or replace the pump.
4. Check and replace the torque converter.
5. See problem "low mainline pressure" below.
6. Check clutch pressures, check clutch piston rings.
7. Check internal cored passages and the casting for
porosity.
8. See problem "High Stall Speeds (on all clutches)."
9. See problem "Low Stall Speeds (on all clutches)."
10. See problem "Overheating".
1. Check, repair, replace the pump.
2. Clean suction strainer.
3. Free sticking valve or replace valve.
4.
a. Internal leakage
transmission.
b. Dirty suction strainer- clean strainer.
c. High oil level- drain to proper level.
d. Incorrect grade of oil-drain and refill with the correct
oil.
1. Check and replace the torque converter.
2. Remove, inspect and install new clutch friction/counter
plates.
3. Check internal passages and the casing for porosity.
1. Check and repair engine.
2. Check and replace the torque converter.
1. See problem "Low Mainline Pressure".
2. Check and replace the torque converter.
3. Check, repair and replace the relief valve.
4. See item 10 in problem "Overheating."
(cored passages)-inspect
7-11
7