Manitowoc Grove YB5515-2, Service And Maintenance Manual

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GROVE
Published 1-20-2017, Control# 483-02
7-9
CD5515-2/YB5515-2 SERVICE MANUAL TRANSMISSION AND TORQUE CONVERTER
7
Troubleshooting
Problem Possible Cause Remedy
Lack of Power. 1. Poor engine condition.
2. Low oil level.
3. Worn pump.
4. Torque converter damaged.
5. Low mainline pressure.
6. Clutches slipping.
7. Internal leakage.
8. High stall speeds.
9. Low stall speeds.
10. Overheating.
1. Check and if necessary repair the
engine.
2. Add oil to transmission.
3. Check, repair or replace the pump.
4. Check, repair or replace the torque
converter.
5. See fault “Low Mainline Pressure.”
6. Check clutch pressures, check
clutch piston rings.
7. Check internal cored passages
and the casting for porosity.
8. See fault “High Stall Speeds” (on
all clutches).
9. See fault “Low Stall Speeds” (on
all clutches).
10. See fault “Overheating.”
Low Mainline Pressure. 1. Worn pump.
2. Blocked suction strainer.
3. Pressure maintaining valve
sticking or leaking.
4. Foaming oil.
1. Check, repair or replace the pump.
2. Clean suction strainer.
3. Free sticking valve or replace
valve.
4. Internal leakage (cored passages)
- inspect transmission.
D i r t y s u c t i o n s t r a i n e r - c l e a n
strainer.
High oil level - drain to proper
level.
Incorrect grade of oil - drain and
refill with correct oil.
High Stall Speed (on all clutches). 1. Damaged torque converter
blades.
2. Clutches slipping clutch friction/
counter.
3. Internal leakage.
1. Check, repair or replace the torque
converter.
2. Remove, inspect and install new
plates.
3. Check internal passages and
casing for porosity.
Low Stall Speeds (on all clutches). 1. Poor engine condition.
2. Torque converter reaction member
clutch slipping.
1. Check and repair engine.
2. Check and repair the torque
converter.
Reference Only