10 - 1
Syncro-Shuttle Gearbox - Hydraulic
Before commencing with the fault finding procedure make sure that the correct type of transmission fluid has been used.
LACK OF POWER
Possible Cause Remedy
1 Poor engine condition. 1 Check and if necessary repair engine.
2 Low oil level. 2 Top up system.
3 Worn pump. 3 Check flow and if necessary repair or renew pump.
4 Torque converter damage. 4 Check and if necessary repair or renew torque converter.
5 Low mainline pressure. 5 See fault 'Low Mainline Pressure'.
6 Clutches slipping. 6 See fault 'Low Clutch Pressure'.
7 Internal leakage. 7 a) Check internal cored galleries and casting for porosity.
b) Check condition of seals.
8 High stall speeds. 8 See fault 'High Stall Speeds'.
9 Low stall speeds. 9 See fault 'Low Stall Speeds'.
10 Overheating. 10 See fault 'Overheating'.
LOW MAINLINE PRESSURE (in neutral)
Possible Cause Remedy
1 Worn pump. 1 Check flow and if necessary repair or renew pump.
2 Blocked suction strainer. 2 Clean suction strainer.
3 Pressure maintaining valve sticking/leaking. 3 Free off or renew valve.
4 Oil aerated (foaming). 4 a) Internal leakage (cored galleries) - inspect/repair
transmission.
b) Dirty suction strainer - clean strainer.
c) High oil level - drain to proper level.
d) Incorrect grade of oil - drain then refill with correct oil.
HIGH STALL SPEEDS (Forward & Reverse Clutches)
Possible Cause Remedy
1 Damaged converter blades. 1 Check and if necessary renew converter.
2 Clutches slipping. 2 See fault 'Low Clutch Pressure'.
3 Internal leakage. 3 a) Check internal cored galleries and casting for porosity.
b) Check condition of seals.
LOW STALL SPEEDS (Forward & Reverse Clutches)
Possible Cause Remedy
1 Poor engine condition. 1 Check and if necessary repair engine.
2 Torque converter reaction member clutch slipping. 2 Check and if necessary renew torque converter.
LOW CONVERTER OUT PRESSURE
Possible Cause Remedy
1 Low mainline pressure. 1 See fault heading 'Low Mainline Pressure'.
2 Converter internal leakage. 2 Check and if necessary renew converter.
3 Converter relief valve faulty. 3 Check and if necessary repair relief valve.
4 Restriction in converter feed. 4 See item 10 in fault 'Overheating'
LOW PUMP FLOW
Possible Cause Remedy
1 Low oil level. 1 Top up system.
2 Blocked suction strainer. 2 Clean suction strainer.
3 Worn pump. 3 Repair or renew pump.
Section F Transmission
9803/7130
Section F
10 - 1
Issue 1
Fault Finding
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