Clutch Air Pressure Tests

CLUTCH AIR PRESSURE TESTS

Special Tools:










Inoperative clutches can be located using a series of tests by substituting air pressure for fluid pressure using (10383).

The clutches may be tested by applying air pressure to their respective passages. The valve body must be removed. To make air pressure tests, proceed as follows:

NOTE:
The compressed air supply must be free of all dirt and moisture. Use a pressure of 5-8 bar (73-116 psi).

Remove the oil pan and the valve body. Install (10383) and tighten bolts to 6 Nm (50 in. lbs.). When testing is finished install valve body and tighten new bolts to 8 Nm (71 in. lbs.). Install the oil pan bolts and tighten to 10 Nm (89 in. lbs.). Fill the transmission Service and Repair.

NOTE: If any clutch does not appear to be functioning with the air, add some 8HP trans fluid and try the test again. Some circuits will not operate without fluid.

A CLUTCH

Apply air pressure to the feed hole located on the test plate marked A, listen for an audible thud. The piston should return to its starting position when the air pressure is removed.

B CLUTCH FUNCTION

Apply air pressure to the feed hole located on the test plate marked B1, listen for an audible thud. The piston should not return to its starting position when the air pressure is removed. If air pressure is applied to the B2 circuit, the B1 should return. An audible hiss may be heard when testing this clutch as the seal is designed to allow fluid/air to pass.

C CLUTCH

Apply air pressure to the feed hole located on the test plate marked C, listen for an audible thud. The piston should return to its starting position when the air pressure is removed.

D CLUTCH

Apply air pressure to the feed hole located on the test plate marked D, listen for an audible thud. The piston should return to its starting position when the air pressure is removed.

E CLUTCH

Apply air pressure to the feed hole located on the test plate marked E, listen for an audible thud. The piston should return to its starting position when the air pressure is removed.