2ND/Rev Clutch Hydraulic Circuit Air Check

To air check 2nd clutch hydraulic circuit, apply air to the 2nd clutch apply pressure port. (For proper location, refer to "Pressure Ports - Transaxle Case Diagram".) When applying air to 2nd clutch, a small amount of cross leakage between 2nd and 3rd clutch is normal. Third clutch should not immediately apply when applying air to the 2nd clutch apply port while blocking the 3rd clutch apply port. However, it is normal for 3rd clutch to apply within 2-3 seconds after applying air to the 2nd clutch apply port when the 3rd clutch apply port is blocked. This is due to a small amount of normal leakage around the input shaft O-ring seal between the 2nd and 3rd clutch.
If 2nd clutch does not apply properly when performing the air check, possible sources of leakage include:
- Damaged 2nd clutch piston (1).
- Worn or damaged input shaft hub seal ring(s) (2).
- Input shaft nut not torqued properly/not fully seated (3).

NOTICE: If air/bubbles are observed coming from the lube port when the 2nd clutch apply pressure port is pressurized, this may be an indication that the input shaft nut is loose or not properly seated.

- Delivery tube bushing in input shaft mislocated or loose (4).

NOTICE: To verify that the bushing is at the correct depth, refer to the procedure titled "Misplaced or Loose Input Shaft Inner Tube Bushing Check" procedure.

- Damaged clutch housing to input shaft O-ring under 2nd clutch (5).
- Damaged clutch housing to input shaft O-ring seal between 2nd and 3rd clutches (6).
- Input shaft inner tube retaining pin out of position/missing (7).
- Damaged input shaft inner tube O-ring seal (8).
- Damaged/missing delivery tube sleeve (9).
- Damaged forward/reverse servo piston cover O-ring (10).

NOTICE: A large leak in 1st gear circuit can cause a loss of other forward gears.

If the complaint is for reverse, inspect the forward/reverse servo piston following the procedures below in addition to the 2nd rev clutch hydraulic circuit procedures.
1. Plug off the reverse pressure from the forward/reverse servo to 2nd clutch apply port.
2. Place a rag over 1st, 3rd and 4th oil-to-servo piston port to avoid spray.
3. Apply pressure to the reverse pressure to forward/reverse servo piston pressure port.

CAUTION: As pressure is applied to the reverse pressure to forward/reverse servo piston pressure port, air pressure will cause a spray-back of oil out of the 1st, 3rd and 4th oil-to-servo piston port. In the event of hot transaxle oil, this could result in personal injury.

When following the above procedures, the forward/reverse servo piston should move, pulling the fork toward the reverse driven gear. If the forward/reverse servo piston does not apply properly, inspect for:
- Damaged forward/reverse servo piston cover O-ring (10).
- Damaged forward/reverse servo piston seal (11).

IMPORTANT: For detailed information on delay/harsh engagement into reverse, refer to the "Delay/Harsh Engagement Into Reverse Diagnostic Chart".