Air Pressure Test

Band/Clutch Application Chart 601 (Part One Of Two):

Band/Clutch Application Chart 601 (Part Two Of Two):

DESCRIPTION
A no-drive condition can exist, even with correct transmission fluid pressure, because of inoperative clutches or bands. Refer to the Band/Clutch Application Chart No. 601 to determine the appropriate elements. A clutch concern can be located through a series of checks by substituting air pressure for fluid pressure to determine the location of the concern.

Example: When the transmission range selector lever is in a forward gear range (D, 2, 1), a no-drive condition may be caused by an inoperative forward clutch.

TEST PROCEDURES
1. Drain the transmission fluid. Remove the transmission fluid pan.
2. Remove the filter assembly and seal, the solenoid body and the control assemblies.

Air Pressure Test Port Locations:

3. The inoperative clutches can be located by applying air pressure into the appropriate clutch port. See the Air Pressure Test Port Locations diagram for clutch port locations.


4. Apply air pressure to the appropriate clutch port (see diagram). A dull thud may be heard or movement felt when a clutch piston is applied. If the clutch seals or check ball are leaking, a hissing may be heard.

TEST RESULTS
If the servos do not operate, disassemble, clean and inspect them to locate the source of the concern.

If air pressure applied to the clutch passages fails to operate a clutch, or operates clutches simultaneously, inspect the fluid passages in the case.

If air pressure applied to the accumulator fails to operate an accumulator, remove and inspect the case passages and piston.