Specifications, Service and Repair of Farm and Lawn Tractors


Dry dual plate tractor clutch

Fig.1 - Belarus Tractor Clutch Mechanism

1 – flywheel; 2 – intermediate plate; 3 – pressure plate; 4 – PTO driving shaft; 5 – hub; 6 – bearing; 7 – transmission shaft; 8 – floating bushing; 9 – vibration damper; 10 – clutch release lever; 11 – leverage mechanism; 12 – bearing plate or clutch cover; 13 – fork; 14 – washer; 15 – nut; 16 – bearing; 17 – clutch release shifter; 18 – clutch release shifter support; 19 – clutch release fork; 20 – control spindle; 21 – shell cup; 22 – pressure springs; 23 – separating washer; 24 – driven plates.

A dry dual plate clutch type, constantly engaged clutch is installed on the engine flywheel (1).

The flywheel (1), the pressure plate (3) and the intermediate plate (2) with three prongs on its surface, which enter into special slots on the flywheel (1), constitute the driving section of the clutch.

The driven section of the clutch consists of two driven plates (24) fitted with vibration dampers (9) installed on the power-transmission shaft (7).

A necessary pressing force of friction surfaces of the clutch driving and driven sections is developed by nine external and internal springs (22). A resilient element is in- stalled between the floating bushing (8), coupled with the driving shaft (4), and the clutch bearing plate (12).

The intermediate plate (2) is fitted with leverage mechanisms (11) which operate to place the plate (2) equidistant from the friction surfaces of the flywheel (1) and the pressure plate (3), when the clutch is disengaged.

The forks (13) fastened on the bearing disk by means of the adjusting nuts (15) locked by the washers (14) serve as supporting points for the clutch release levers.

The engagement and disengagement of the clutch are achieved with the help of the clutch release shifter (17) assembled with the throw-out bearing (16) which can slide along the support (18). The shifter fork (19) together with spindle (20) is connected with the clutch pedal through a hydrostatic actuator.

The throw-out bearing (16) is lubricated through a grease nipple screwed in into the shifter shank.

Assembling, disassembling and adjustment of the Belarus Tractor MTZ clutch

Procedure of dismantling the clutch from the engine:

- Set three auxiliary bolts (М12х40) by turning them into the pressure plate (4) through the auxiliary holes of the bearing plate (7).

- Turn out the nuts fastening the bearing disk to the flywheel and remove the clutch discs (bearing disk (7) complete with the pressure one (4)).

- Remove the first driven plate (2).

- Remove the intermediate disc (3).

- Remove the second driven plate (2).

Disassembling the Belarus Tractor clutch discs

The disassembling of the clutch discs is described in the Manual for Disassembling and Reassembling.

Procedure of reinstallation of the clutch onto the engine:

- Set the splined arbour into the flywheel bearing.

- Mount the first driven plate (2) onto the arbour with the long end of the hub directed towards the flywheel (1).

- Mount the intermediate disk (3) into the flywheel slots.

- Mount the second driven plate (2) onto the arbour with the short end of the hub directed towards the flywheel.

- Mount the clutch discs (bearing disk (7) complete with the pressure one (4)) on the flywheel pins with bushes (14), fasten them with nuts and turn out the auxiliary bolts.

- Adjust the position of the release levers (6).

- Adjustment of the position of the release levers

Adjust the position of the release levers to the distance of 14±0.5 from the bearing surfaces of the levers to the bearing disk hub end face by turning the adjusting nuts (9) in or out.

The difference in the size for individual levers shall be not more than 0.3 mm. After adjustment of the levers, mount the locking plates (10). Remove the arbour.