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Diagnosis and repair



AIR PRESSURE TESTS
1.The air pressure test can diagnose a slip problem if it is in the valve body or in the hydraulic system beyond the valve body.

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2.Blowing air in the various pressure passages, as shown in the Case Oil Passage Hole Identification image, will tell if the clutch and servo circuits are hydraulically tight. For example, if you had slip in all forward gear ranges, you suspect the forward clutch is slipping. If the trouble is a seal leak inside the transmission, you probably cant apply the clutch with air. But if you get a distinct thud or can feel the piston applying with your hand, the hydraulic system is tight. Unless the clutch is burned out (which you should know by now from friction material in the oil), the trouble must be somewhere else.

Forward Clutch
1.Apply air pressure to the transmission case forward clutch passage.
2.A dull thud can be heard when the clutch piston is applied.
3.If no noise is heard, place your finger tips on the input shell and again apply the pressure to the forward clutch passage.
4.Movement of the piston can be felt as the clutch is applied.

Intermediate Servo
1.Hold the air nozzle in the intermediate servo apply passage.
2.Operation of the servo is indicated by a tightening of the intermediate band around the drum.
3.Continue to apply air pressure to the intermediate servo apply passage, and introduce air pressure into the intermediate servo release passage.
4.The intermediate servo should release the band against then apply pressure.

Governor
1.Apply air pressure to the governor passage and listen for a sharp clicking or whistling noise.
2.The noise indicates governor valve movement.

Low Reverse Clutch
1.Apply air pressure to the clutch apply passage.
2.A dull thud indicates the clutch piston is operating properly.

High Reverse Clutch
1.Apply air pressure to the reverse-and-high clutch passage.
2.A dull thud indicates that the reverse-and-high clutch piston has moved to the applied position.
3.If no noise is heard, place finger tips on the clutch drum and again apply air pressure to detect movement of piston.


AIR PRESSURE TESTS
1.The air pressure test can diagnose a slip problem if it is in the valve body or in the hydraulic system beyond the valve body.

Case Oil Passage Hole IdentificationCase Oil Passage Hole Identification



2.Blowing air in the various pressure passages, as shown in the Case Oil Passage Hole Identification image, will tell if the clutch and servo circuits are hydraulically tight. For example, if you had slip in all forward gear ranges, you suspect the forward clutch is slipping. If the trouble is a seal leak inside the transmission, you probably cant apply the clutch with air. But if you get a distinct thud or can feel the piston applying with your hand, the hydraulic system is tight. Unless the clutch is burned out (which you should know by now from friction material in the oil), the trouble must be somewhere else.

Forward Clutch
1.Apply air pressure to the transmission case forward clutch passage.
2.A dull thud can be heard when the clutch piston is applied.
3.If no noise is heard, place your finger tips on the input shell and again apply the pressure to the forward clutch passage.
4.Movement of the piston can be felt as the clutch is applied.

Intermediate Servo
1.Hold the air nozzle in the intermediate servo apply passage.
2.Operation of the servo is indicated by a tightening of the intermediate band around the drum.
3.Continue to apply air pressure to the intermediate servo apply passage, and introduce air pressure into the intermediate servo release passage.
4.The intermediate servo should release the band against then apply pressure.

Governor
1.Apply air pressure to the governor passage and listen for a sharp clicking or whistling noise.
2.The noise indicates governor valve movement.

Low Reverse Clutch
1.Apply air pressure to the clutch apply passage.
2.A dull thud indicates the clutch piston is operating properly.

High Reverse Clutch
1.Apply air pressure to the reverse-and-high clutch passage.
2.A dull thud indicates that the reverse-and-high clutch piston has moved to the applied position.
3.If no noise is heard, place finger tips on the clutch drum and again apply air pressure to detect movement of piston.





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