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Massey Ferguson tractors - Carraro front axle troubleshooting

Ring gear teeth damaged on external side

Excessive load on teeth in relation to design load. Incorrect backlash (excessive clearance). Loosening of the pinion nut. Replace the ring gear and pinion. Carefully follow the recommended adjustment operations for bevel gear clearance.

Ring gear teeth damaged on internal side

Jerky load. Incorrect shimming of teeth (insufficient clearance). Loosening of the pinion nut. Replace the ring gear and pinion. Carefully follow the recommended adjustment operations for bevel gear clearance.

Ring gear teeth and pinion teeth worn or damaged

Insufficient lubrication. Contaminated fluid. Lubrication incorrect or containing diluting additives. Pinion pin clearance misadjusted and poor contact between pinion and ring gear caused by wear to the pinion bearings. Replace the ring gear and pinion. Replace the bearings, ensuring the correct positioning of the ring gear, pinion and bearings preloads. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Ring gear teeth and pinion teeth overheated

Check that the teeth have not lost their colouring. Prolonged operation at excessive temperatures. Incorrect lubrication. Low oil level. Contaminated fluid. Replace the ring gear and pinion. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Pinion teeth corroded

Excessive use. Insufficient lubrication. Replace the ring gear and pinion. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Carraro front axle beam warped

Vehicle overload. Vehicle accident. Jerky load. Replace axle beam.

Bearings worn or corroded

Insufficient lubrication. Contaminated fluid. Excessive use. Normal use. Loosening of the pinion nut. Replace the bearings. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Oil leak at seals

Prolonged use at excessive oil temperature. Incorrect assembly of oil seal. Damaged lip seal. Contaminated fluid. Replace the seal and mating surface if damaged. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Input flange splines excessively worn

Excessive use. Loosening of the pinion nut. Pinion shaft clearance. Replace the flange. Check the wear on pinion splines. If necessary replace the ring gear and pinion.

Pinion teeth broken due to fatigue

Check if the rupture is straight (jagged). Excessive use. Prolonged overload. Replace the ring gear and pinion.

Pinion teeth and ring gear teeth broken

Differential parts at breaking load. Check and replace other differential parts if necessary.

Pinion splines of sun gear excessively worn (excessive backlash)

Excessive use. Replace the pinions throughout the differential. If necessary, replace the stub axle.

Thrust washer mating surface worn or scratched

Insufficient lubrication. Incorrect lubrication. Contaminated fluid. Replace with a new washer if scratched or if thickness is under 0.1 mm. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Taper roller bearing internal diameter worn

Excessive use. Excessive pinion axial clearance. Insufficient lubrication. Contaminated fluid. Replace bearing. Check pinion axial clearance. Use suitable lubricants, top up level when required and change the lubricant as indicated in the recommended maintenance schedule.

Stub axle warped or broken

Excessive use or vehicle overload. Replace the defective stub axle.

Stub axle broken at wheel side

Wheel support loose. Axle beam warped. Replace the defective stub axle. Ensure that the Carraro front axle beam is not warped. Ensure that the wheel support is not worn or misadjusted.

Carraro front axle - Problem identification and diagnostics

Problem - Noise when vehicle is moving

Excessive backlash between the ring gear and pinion - Adjust backlash. Ring gear or pinion worn - Replace the defective component. Pinion bearings worn - Replace the bearings. Pinion bearings loose - Adjust the bearings. Excessive pinion axial clearance - Adjust backlash. Differential bearings worn - Replace the bearings. Differential bearings loose - Adjust the bearings. Excessive ring gear out-of-round - Replace the ring gear. Hydraulic fluid low - Top up level. Insufficient or incorrect grade lubricant - Change lubricant. Stub axle warped - Replace the stub axle.

Problem - Noise when engine is in neutral position

Noises caused by the axle can generally be heard faintly when the engine is in neutral position - Adjust or replace. Incorrect backlash between the pinion and ring gear (the noise can be heard at the end of deceleration, when the engine starts to accelerate) - Adjust backlash. Input flange or pinion excessively worn - Replace defective parts.

Problem - Intermittent noise

Ring gear damaged - Replace the bevel gear. Differential unit bolts loose - Tighten to the required torque

Problem - Continuous noise

Ring gear or pinion damaged. Replace the bevel gear. Bearings worn. Replace the bearings. Pinion splines worn. Replace the pinion. Stub axle warped. Replace the stub axle.

Problem - Noise when changing steering angle

Differential pinion gears worn. Replace the pinion gears. Differential unit and / or spider worn. Replace defective components. Differential thrust washers worn. Replace the bearings. Stub axle splines worn. Replace the stub axle.

MF TRACTORS TROUBLESHOOTING
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