Adjustment Of Fda Drive Automatic Switch - Belarus 1822.3 Operator's Manual

As the rear wheel skidding exceeds the preset value, the shaft 6 speed decreases
to such extent that the drum 3 turns in an opposite direction and the spring 5 returns the
half-clutch 4 into its initial position. The half-clutch displaces the pusher 12 with its tapered
part, the switch 13 closes the electrical circuit of the hydraulic valve group 11 electromag-
net, oil is supplied to the clutch booster under pressure, thus moving the piston 2. Hereby
the disk pack gets compressed, locking the gear 1 and the drum 3 and ensuring torque
transfer.
As the FDA is positively engaged, oil is supplied to the clutch booster irrespective of
the rear wheel skidding. As the FDA is disengaged the valve group overlaps the charging
line, and oil goes from the clutch booster for drain. For checking pressure in the drive clutch
booster there is a testing hole, shut with a plug 14. The switch 13 and the electro-hydraulic
valve group 11 are guarded with a housing 10.
Rules for FDA drive control are provided in section 2 "Controls and instruments".

3.11.4.2 Adjustment of FDA drive automatic switch

1 – drum; 2 – half-clutch; 3 – pusher; 4 – shim; 5 – switch; 6 – cover.
Figure 3.11.6 –
The adjustment of the switch 5 (figure 3.11.6) shall be carried out after the hydraulic
clutch has been assembled and the cover 6 has been mounted on the transmission in the
following order:
- turn the drum 1 and set put it into position "I", when the jaws of the half-clutch 2
and the drum 1 are fully closed, the pusher 3 is projected into the extreme position;
- mount the initial number of the adjusting shims 4 (five or six pieces) under the end
surface of the switch 5;
- removing one adjusting shim 4, achieve the switch position, when its contacts are
closed;
- put the half-clutch 2 into position "II", when the jaws of the half-clutch 2 and the
drum 1 are fully opened, the pusher 3 is recessed to the extreme position;
- check opening of the switch 5 contacts in position "II".
The switch is considered correctly adjusted if its contacts are closed in position "I"
and opened in position "II". Check per the pilot lamp. It is possible to check per the annun-
ciator on the dashboard, with the FDA drive control button in the upper position.
ATTENTION: IN POSITION "I" THE DIMENSION "A" FROM THE PUSHER 3 END
SURFACE (FIGURE 3.11.6) TO THE SWITCH 5 END SURFACE BEING BELOW 11,5
MM IS NOT PREMITTED! VIOLATION OF THIS REQUIREMENT MAY RESULT IN
SWITCH BREAKDOWN!
Adjustment of FDA drive automatic switch
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