The following is the recommended procedure for air checking the 2nd clutch (430), 3rd clutch (606) and reverse clutch (505) assemblies. This procedure is used to apply a clutch assembly during disassembly and or reassembly of the Hydramatic 4T80-E transaxle. To properly perform this procedure, you will need a rubber tipped air nozzle and filtered compressed shop air. The recommended line pressure of the compressed shop air is at least 90 psi.

Caution: Wear safety glasses when using compressed air in order to prevent eye injury.

Important: The 2nd clutch (430) can be seen when it applies. If unable to verify that a clutch or clutches applies with the compressed shop air, then inspect the following components for possible causes.

With the 2nd clutch (430), reverse clutch (505) and 3rd clutch (606) installed in the case, apply 50-60 psi of filtered compressed shop air to the appropriate passages located in the driven sprocket support (418), passage 39 for the 2nd clutch, passage 40 for the 3rd clutch and passage 33 for the reverse clutch. If the cluches are assembled properly and sealing, you should be able to hear them apply and release.

1. Inspect the driven sprocket support (418) for the following:

•	Oil rings (422) sealing surface damaged and or missing

•	Lobe seal rings (423) damaged sealing surface and or missing

2. Inspect the reverse clutch assembly (505) for the following:

•	Piston inner (506) or outer (507) seal damaged sealing surface and or missing

•	Piston (505) physical damage and or checkball damage or missing

•	Spring and retainer assembly (508) damage

•	Reverse clutch housing (500) for physical damage or a poor sealing surface finish

•	Clutch plates (511, 512, 513, 514) damaged and or missing the correct number of plates.

3. Inspect the 2nd clutch for the following:

•	2nd clutch piston (430) physical damage

•	Oil transfer sleeve (419) damage or restricted passage

•	2nd clutch plates (431, 432, 433, 434, 435) damaged and or missing the correct number of plates

4. Inspect the 3rd clutch for the following:

•	3rd clutch piston assembly (606) physical damage

•	3rd clutch piston assembly (606) checkball (2) damaged and or missing

•	Oil seal rings (614) damaged sealing surface and or missing

•	Transfer sleeve (603) damage and or restricted oil passage.

•	Clutch plates (610, 611, 612, 613) damage and or missing the correct number of plates




5. To check the forward and coast clutch assemblies, apply 50-60 psi of filtered compressed shop air pressure to the appropriate passages located in the lower case to the forward clutch support assembly, passage (38) for the forward clutch and passage (49) for the coast clutch. You should be able to hear the clutches apply. If not, inspect the following for possible causes.
6. Inspect the forward coast clutch for the following:

•	Forward clutch piston (807) inner (808) and or outer (809) seals, for damaged sealing surface and or missing

•	Coast clutch piston assembly (810) physical damage

•	Forward piston (807) physical damage

•	Clutch plates (812, 813, 814, 816, 817, 819) damage and or missing the correct number of plates

•	Forward clutch apply ring (811) damage and or missing

7. Inspect the forward/coast clutch support for the following:

•	Support/housing oil seal rings (829) damaged sealing surface and or missing

•	Oil Transfer sleeve (824) physical damage and or restricted oil passages