Air Pressure Test
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
| Item | Description |
|---|---|
| 1 | Converter inlet |
| 2 | Converter outlet |
| 3 | Overdrive clutch |
| 4 | Forward clutch |
| 5 | Pump Inlet |
| 6 | Pump outlet |
| 7 | Direct clutch |
| 8 | Torque converter clutch |
| 9 | Intermediate clutch |
| 10 | Low/Reverse dynamic |
| 11 | Low/Reverse static |
A no-drive condition can exist even with correct transmission fluid pressure because of inoperative clutches. Refer to the CLUTCH APPLICATION CHART to determine which clutch is applied in each gear range. 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 selector lever is in a forward gear range, a no-drive condition may be caused by an inoperative forward clutch.
- Drain the transmission fluid. Remove the transmission fluid pan.
- Remove the transmission fluid filter and seal assembly along with the main control.
- The inoperative clutches can be located by applying air pressure into the appropriate clutch port.
- Apply air pressure to the appropriate clutch port. 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 sound may be heard.
- If the clutches fail to operate during the air check:
- the piston seals are not seated, damaged or installed incorrectly.
- plugged feed holes for clutch apply in the case and/or clutch cylinder.
- damaged piston and/or clutch cylinder.
- damaged or missing shaft seals in clutch circuit.
- Service as required and recheck.