MYY & MZZ Transmission-22 PROBLEM & INSPECTION PROBLEM POSSIBLE CAUSE CORRECTION Abnormal Noise 1. Flywheel pilot bearing wear. 1. Replace the bearing. 2. Main shaft or countershaft bearing wear or other damage. 2. Replace the bearing(s). 3. Main shaft gear, counter-shaft gear, and/or reverse idle gear wear or other damage. 3. Replace the gear(s). 4. Main shaft spline and/or synchronizer hub spline wear. 4. Replace the spline(s). 5. Gear or bearing thrust surface scoring. 5. Replace the gear(s)and/or bearing(s). 6. Insufficient backlash between mating gears. 6. Replace the gears. Difficult shifting 1. Insufficient clutch pedal play. 1. Adjust the play. 2. Change lever contact surface wear.
2. Repair or replace the change lever and apply grease. 3. Shift block, shift rod, and/or control box contact surface wear. 3. Replace the worn components. 4. Shift arm and/or synchronizer sleeve wear. 4. Replace the worn parts. 5. Thrust washer and collar and/or gear thrust surface wear (Main shaft and counter-shaft thrust play). 5. Replace the worn parts. 6. Synchronizer wear. 6. Replace the synchronizer. Gear slippage 1. Detent ball wear. 1. Replace the détente ball. 2. Shift rod and/or control box contact surface wear. 2. Replace the worn components. 3. Shift arm and/or synchronizer sleeve wear. 3. Replace the worn parts. 4.
Thrust washer and collar and/or gear thrust surface wear (Main shaft and counter-shaft thrust play). 4. Replace the worn parts. 5. Bearing wear or other damage 5. Replace the worn or damaged bearings. 6. Main shaft spline and synchronizer hub spline wear. 6. Replace the worn parts. 7. Synchronizer spring weak or broken. 7. Replace the spring. Oil leakage 1. Drain plug and/or filler plug loose. 1. Tighten the plug(s) 2. Broken gasket. 2. Replace the gasket. 3. Oil seal wear or damage. 3. Replace the oil seal.