10 - 2
Syncro-Shuttle Gearbox - Hydraulic (cont'd)
HIGH CONVERTER OUT PRESSURE
Possible Cause Remedy
1 Oil cooler/lines blocked. 1 Clean cooler, free blockage.
2 Converter in pressure incorrect 2 Check converter in pressure correct
3 Converter relief valve faulty. 3 Check and if necessary repair relief valve.
LOW LUBRICATION PRESSURE
Possible Cause Remedy
1 Low mainline pressure. 1 See fault heading 'Low Mainline Pressure'.
2 Oil cooler/lines blocked. 2 Clean cooler, free blockage.
3 Ruptured lubrication line. 3 Repair line.
4 Converter internal leakage. 4 Check and if necessary renew converter.
5 Converter relief valve faulty. 5 Check and if necessary repair or renew relief valve.
6 Leak at pump to case joint (indicated by low cooler flow) 6 Check and if necessary repair or replace as necessary.
7 Restriction in converter feed 7 See item10 in fault 'Overheating'
LOW CLUTCH PRESSURE AND/OR CLUTCH SLIPPING
Possible Cause Remedy
1 Low mainline pressure. 1 See fault heading 'Low Mainline Pressure'.
2 Worn pump. 2 Check flow and if necessary repair or renew pump.
3 Blocked restrictor orifice in F/R solenoid valve block. 3 Remove F/R solenoid and clear restriction in solenoid
(Both F/R clutches will indicate low pressure). valve block.
4 Clutch seals worn. 4 Confirm with a clutch leak test, if required renew clutch
seals
5 Clutch piston rings worn. 5 Confirm with a clutch leak test, renew piston rings.
6 Mechanical failure. 6 Strip and rebuild clutch, renew parts as required.
LOW COOLER FLOW
Possible Cause Remedy
1 Converter relief valve faulty. 1 Check and if necessary repair or renew relief valve.
2 Leak at pump to case joint . 2 Check and if necessary repair or replace as necessary.
3 Worn pump. 3 Check flow and if necessary repair or renew pump.
4 Internal leakage. 4 a) Check internal cored galleries and casting for porosity.
b) Check condition of seals.
5 Restriction in converter feed. 5 See item 10 in fault 'Overheating'.
OVERHEATING
Possible Cause Remedy
1 Low oil level. 1 Top up system.
2 High oil level. 2 Drain oil to correct level.
3 Trapped or kinked hoses in cooler system. 3 Renew or repair hoses.
4 Low converter out pressure and flow rate. 4 Repair or renew the converter relief valve.
5 Oil cooler blocked. 5 Clean cooler.
6 Operating in wrong gear range. 6 Select correct gears to suit working conditions.
7 Water system overheating. 7 Rectify water system problems, eg radiator, cooler lines,
low water level etc.
8 Oil aerated (foaming). 8 See fault 'Low Mainline Pressure', item 4.
9 Clutch piston(s) sticking on return stroke. 9 Check and repair clutch piston(s) and seal(s).
10 Cored galleries on front housing pump mounting 10 Replace front housing (or rectify existing housing).
face wrong depth (indicated by excessively low
pressure and flow on converter out cooling line).
11 Leakage across pump mounting face and front case. 11 Check for damaged surface on both components and
loose pump mounting bolts.
Section F Transmission
9803/7130
Section F
10 - 2
Issue 1
Fault Finding
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