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Massey Ferguson 5465, 6465 - Carraro front axle

Carraro 20.19 front axle may be fitted on MF 5465, 6465 tractor. The front axles mounted on the 4WD tractors consist of: 1) centre housing containing the differential unit and the differential lock system, as well as the transmission shafts, 2) each end, a hub assembly containing the final drive units. The front axle is assembled to the front frame of the tractor by means of a pivot which adapts to theunevenness of the ground. Drive is transmitted from the rear axle to the front axle by a universal joint shaft.

Engagement is ensured by an electrohydraulically controlled multidisc clutch. The differential unit is held by two half-bearings mounted on a suitable support allowing the crownwheel and pinion to be adjusted. The bevel gear is supported by two bearings and is adjusted using shims. The wheel hubs containing the final drives are held in place by two tapered roller bearings and driven by a hydraulically controlled steering gear.

Massey Ferguson 5465, 6465 - Carraro 20.19 front axle

Parts list - (1) Axle housing (2) Final drives (3) Flange (4) Pinion (5) Differential (6) Bush (7) Steering ram

Carraro 20.19 front axle specifications and dimensions

Dimensions for Carraro 20.19 front axle models (All values in the following tables are given in millimetres): A = 2045, B = 320, C = 220.8, D = 1800, E = M18x1.5, F = 275, G = 456, H = 90, I = 49, J = 215, K = 136, L = 134, M = 347, N = 481, O = 115.

Differential - 9 / 32 (1 / 3.55)
Final drive - 1 / 6.0
Total reduction - 1 / 21.33
Unladen weight - 320 kg
Input direction of rotation - Anti-clockwise
Differential type - Multidisc lock
Max. inner/outer steering angle - 55° / 42°
Oil specification - SAE 85W-140
Differential oil capacity - 6 L
Final drive unit oil capacity - 0.7 + 0.7 L

Dismantling the steering ram assembly

Chock the rear wheels. Apply the hand brake. Because the 4WD clutch is mechanically engaged when stationary, raise the two front wheels so that the wheel hub in question can be turned freely. Place axle stands in position. Remove the wheel concerned. Drain the drive unit.

Dismantling the steering ram assembly

Loosen the selector rail counter-nut by several turns until it is at the same level as the threaded stud. Strike the nut with a hammer to extract the selector rail from the swivel housing. This will destroy the nut. To disassemble the steering ram.

MF 5465, 6465 - Carraro front axle troubleshooting

Problems: Wheel vibration, front tire resistance, broken stub axle.

Possible causes: Incorrect installation / Defective axle - Re-install. If differential tests after assembly are not satisfactory, repair or replace the differential. Overload / incorrect weight distribution - Remove excess weight and distribute the load as indicated by the instruction supplied by the vehicle manufacturer.

Problems: Steering difficult, the vehicle keeps on moving straight forward when the wheels are turned.

Possible causes: Different wheel turning radius - If the radius of one wheel is smaller than that of its counterpart, partial wheel slippage can result when force is applied. The other wheel, with larger radius, will support the entire load. Replace the tire or adjust the pressure to obtain the same radius for both tyres.

Problems: Differential does not function, it gets jammed when steering.

Possible causes: Differential jammed - Abnormal differential operation or broken or seized-up control mechanism. Check the differential assembly and all its components. On vehicles with a high steering angle, this failure can cause jerky operation, difficulty steering or excessive tire wear on narrow turns. Reduce the steering angle to a minimum and reduce speed when vehicle begins to jerk.

Problems: Excessive transmission noise.

Possible causes: Broken stub axle - It is not recommended to drive with a broken stub axle. The vehicle can only be moved a few meters (engine stopped and at no load). Warped stub axle - Replace the stub axle concerned.

Problems: Excessive tyre wear.

Possible causes: Incorrect wheel alignment - Check the axle assembly and wheel bearings.

Problems: Friction noise.

Possible causes: Broken or worn axle components - Check the condition of the ring gear, pinion, bearings, etc. Replace defective parts. Dirty particles in the axle housing or incorrect assembly of certain components - Detect dirty particles. Check the assembly of different axle components.

Problems: Vibration when driving forward, intermittent noise.

Possible causes: Incorrect bevel gear shimming: transmission components worn (transmission gearing, pivot balls, etc.). Shim or replace the concerned parts.

MF TRACTORS TROUBLESHOOTING
1652	1749	2620	2725	2805
3050	3120	3640	3709	4245
4455	5320	5455	5613	6150
6280	6480	6615	7618	7720