Clutches

Reverse Clutch

1. Inspect the drum band surface, the bushing and thrust surfaces for scores. Minor scores may be removed with crocus cloth. Badly scored parts must be replaced.

2. Inspect the clutch piston bore and the piston inner and outer bearing surfaces for scores. Check the air bleed ball valve in the clutch piston for free movement. Check the orifice to make sure it is not plugged.

3. Check the fluid passages for obstructions. All fluid passages must be clean and free of obstructions.

4. Inspect the clutch plates for wear, scoring and fit on the clutch hub splines. Replace all plates that are badly heat distressed, worn or do not move freely in the hub splines.

5. Inspect the clutch pressure plate for scores on the clutch plate bearing surface. Check the clutch release spring(s) for distortion.

6. Inspect the check ball for freedom of movement and proper seating.

Forward Clutch

1. Inspect the clutch cylinder thrust surfaces, piston bore and clutch plate splines for scores or burrs. Minor scores or burrs may be removed with crocus cloth. Replace the clutch cylinder if it is badly scored or damaged.

2. Check the fluid passage in the clutch cylinder for obstructions. Clean out all fluid passages. Inspect the clutch piston for scores and replace if necessary. Inspect the check balls for freedom of movement and proper seating. AOD has two check balls in the forward clutch cylinder, not the piston.

3. Inspect the composition clutch plates, steel clutch plates, and clutch pressure plate for worn or scored bearing surfaces. Replace all parts that are deeply scored.

4. Check the clutch hub thrust surfaces for scores and the clutch hub splines for wear.

5. Check the splines on the stator support for wear. Replace if excessively worn. Inspect the bushing in the stator support for scores.

Intermediate Friction Clutch

1. Inspect the clutch cylinder piston bore in the rear face of the pump and clutch plate splines for scoring or burrs. Minor burrs may be removed with crocus cloth. Replace the case if it is badly scored or damaged.

2. Clean out all fluid passages. Inspect the clutch piston for scoring and replace if necessary.

3. Check the piston return springs for distortion. Check the piston return spring retainer for flatness.

4. Inspect the composition clutch plates, steel clutch plates and clutch pressure plate for worn or scored bearing surfaces. Replace all parts that are deeply scored.

5. Check the clutch hub splines for wear. Clutch hub splines are attached to the reverse clutch drum.

Direct Clutch

1. Inspect the clutch cylinder thrust surfaces, piston bore and clutch plate splines for scores or burrs. Minor scores or burrs may be removed with crocus cloth. Replace the clutch cylinder if it is badly scored or damaged.

2. Check the fluid passage in the clutch cylinder for obstructions. Clean out all fluid passages. Inspect the clutch piston for scores and replace if necessary. Inspect the piston check ball for freedom of movement and proper seating. Follow the direct clutch piston check ball leakage procedure.

3. Check the clutch release springs and retainer for distortion and cracks. Replace the springs and retainer if it is distorted or cracked.

4. Inspect the friction clutch plates, springs and retainer, steel clutch plates and clutch pressure plate for worn or scored bearing surfaces. Replace all parts that are deeply scored or polished.

5. Check the clutch plates on the clutch hub splines.

6. Check the clutch hub thrust surfaces for scores and the clutch hub splines for wear.

7. Check the splines on the direct driveshaft for wear. Replace the shaft if the splines are excessively worn.

Direct Clutch Piston Check Ball

Inspect the piston check ball for freedom of movement. Improper seating of check ball will cause leakage. Check for leakage by turning the piston upside down (flat side of piston facing you), allowing the check ball to seat in the piston. Pour a small quantity of solvent over the check ball. If solvent drips past the check ball, replace the piston.

One-Way Roller Clutch

1. Inspect the outer and inner races for scores or damaged surface areas where the rollers contact the races. If the intermediate one-way roller clutch inner race is damaged, the reverse clutch hub must be replaced.

2. Inspect the rollers and springs for excessive wear or damage.

3. Inspect the spring and roller case for bent or damaged spring retainers.