66 - 4
Powershift Gearbox
Pressure and Flow Testing, cont’d
Pump Flow
1 Stop engine, remove the gearbox oil filter and fit
adapter X (460/15708) into the gearbox casing.
Connect flowmeter W (892/00268).
2 Start engine and run at 1000 rev/min. With the
transmission in neutral the flowmeter will show the
Pump Flow which should be as shown in Technical
Data. A low reading indicates a worn pump or blocked
suction strainer.
3 Repeat step 2 and note gauge readings with engine
running at 2000 rev/min.
4 Stop engine and remove test adapters, refit filter.
Mainline Pressure
1 Stop engine, connect a 0-20 bar (0-300 lbf/in
2
) pressure
gauge to test connector A.
2 Start engine and run at 1000 rev/min. With the
transmission in neutral the pressure gauge will show
the Main Line Pressure which should be as shown in
Technical Data. A low reading can be caused by either
a faulty pressure maintenance valve or a worn pump. A
high or low reading may indicate a faulty pressure
maintenance valve.
3 Repeat step 2, with engine running at 2000 rev/min
note gauge readings which should be as shown in
Technical Data.
4 Stop engine and remove test gauge.
Converter In Pressure
Note that the converter in pressure is affected by the torque
converter relief valve operation. Before carrying out tests
check the operation of the relief valve (see Converter Relief
(Safety) Valve Pressure).
1 Stop engine, connect a 0-20 bar (0-300 lbf/in
2
) pressure
gauge to test point B.
2 Start the engine and run at 1000 rev/min. With the
transmission in neutral the pressure gauge will show
Converter In Pressure which should be as shown in
Technical Data. A high or low reading could indicate a
faulty converter relief valve.
3 Remove pressure test gauge.
Section F
Transmission
9803/3280
Section F
66 - 4
Issue 1
Service Procedures
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