Clutch actuator


The clutch actuator is intended for controlling the clutch in both forward and reverse motion of the tractor.
The clutch actuator is of hydrostatic type with overhang pedals and hydraulic booster.


1 – reservoir; 2 – spring; 3, 17 – bolt; 4, 8, 14, 18, 27, 42 – nut; 5, 15, 43 – fork; 6, 16, 34, 44 – pin; 7 –clutch pedal for forward motion; 9, 12, 31, 32 – piston lifter; 10 – clutch master cylinder for forward motion; 11 – oil pipeline; 13 – boot; 19 – master cylinder for reverse; 20 – clutch pedal for reverse; 21, 25 – tubing; 22 – tap; 23 – piston; 24 – flexible hose; 26 – support; 28 – protective cap; 29 – overflow valve; 30 – clutch master cylinder; 33, 40 – bracket; 35 – cotter pin; 36 – washer; 37 – cover; 38 – piston; 39 – hydraulic booster; 41 – rod; 45 – lever; 46 – hose; 47 – release spring.

The actuator consists of the clutch master cylinders (10) (for forward motion) and (19) (in the reverse mode), overhang pedals (7) (for forward motion) and (20) (in the reverse mode), tap (22) (for automatic switching from the forward motion to the reverse mode or vice versa), service cylinder (30), hydraulic booster (39), lever (45), reservoir (1), connecting tubing and oil pipes.

The flow-type hydraulic booster (39) is intended for reducing the force to be applied to the pedals (7) and (20) for disengaging the tractor clutch. It is connected with the oil discharge flow of the metering pump via oil pipe (11), and with the drain into the reservoir via hose (46).
On stepping on the pedal (7) in the forward motion mode, the brake fluid is passed from the clutch master cylinder (10) through the tubing (25) to the tap (22). In the tap (22), the piston moves to the rightmost position and closes the input of the tubing (21). Then the brake fluid is passed through the flexible hose (24) to the clutch slave cylinder (30) while moving the piston lifter (31). 
The piston lifter (31) acts upon the piston lifter (32) of the hydraulic booster (39) that causes the operation of the hydraulic booster and advancement of the piston and rod (41) rotating the lever (45) connected with the clutch release shifter that in turn causes the disengagement between the engine and the transmission.
On stepping on the pedal (2) in the reverse mode, the brake fluid is passed from the clutch master cylinder (19) through the tubing (21) to the tap (22). In the tap (22), the piston moves to the leftmost position and closes the inlet of the tubing (25). Then the brake fluid is passed through the flexible hose (24) to the working cylinder (30) and acts as described above.