Clutch and Brake Parts Diagnosis

SYMPTOMS
Clutch Discs and Brake Band





Dry and inspect them for pitting, flaking, wear, glazing, cracking, charring and chips or metal particles imbedded in lining. If discs or brake band show any of the above conditions, replacement is required.

Clutch Steel Plates





Dry plates and check for discoloration. If plate surface is smooth and even color smear is indicated, the plate should be reused. If severe heat spot discoloration or surface scuffing is indicated, the plate must be replaced.

Clutch or Brake Return Spring Assembly





Evidence of extreme heat or burning in the area of clutch may have caused springs to take a heat set and would require their replacement.

POSSIBLE CAUSES OF BURNING
Forward and Direct Clutch Discs
- Stuck or leak in check ball in clutch piston.
- Damaged clutch piston seals.
- Worn or broken seal rings.
- Obstruction in solenoid valves or shift valves.
- Disconnected speed sensor, solenoid or controller.
- Leak in valve body gaskets.
- Low line pressure.

1st/REV Brake Discs and 2nd Brake Band
- Damaged piston seals.
- Obstruction in solenoid valves or shift valves.
- Leak in valve body gaskets.
- Low line pressure.