Belarus 892 - Operation of Reverse Gear Unit

892-0000010B OM
99
3.3.9 Operation of reverse gear unit
The reverse gear is controlled by reverse gear control lever 22 (Figure 3.3.3) accord-
ing to the scheme. Control lever of the reverse gear 22 is brought into the tractor cab and is
located under the left hand of the operator.
To switch from reverse to forward, the operator should move reverse gear control
lever 22 forward away from him. The control force will cause the train of synchronizer 2 to
move forward. Starting to move, it opens drive gear of the reverse gear unit 9 and primary
shaft of the gearbox 8. Further action of the control force will cause the friction conical pair,
formed by the conical ring of synchronizer 2 and the cone of drive gear of the reverse gear
unit 19, to operate. After equalizing of the angular speeds of rotation of primary shaft 8 and
power shaft 18, the train of synchronizer 2 will move further and connect primary 8 and
power 18 shafts. Whereby, the toothed gears of the reverse gear unit do not participate in
the transformation of the power flow.
To switch from forward to reverse, the operator should move reverse gear control
lever 22 back towards him. The control force will cause the train of synchronizer 2 to move
back. Starting to move, it opens power shaft 18 and primary shaft 8. Further action of the
control force will cause the friction conical pair, formed by the conical ring of synchronizer 2
and the cone of driven gear of the reverse gear unit 9, to operate. After equalizing of the
angular speeds of rotation of primary shaft 8 and driven gear of the reverse gear unit 9, the
train of synchronizer 2 will move further and connect gearbox primary shaft 8 to driven gear
of the reverse gear unit 9. Whereby, the power flow from power shaft 18 is transmitted to
primary shaft of the gearbox 8 through the sequential engagement of gears 19, 16, 13 and
9.
Synchronizer 2 provides smooth and shockless switching of the reverse gear unit.
Switching of the reverse gear is carried out in any speed of the gearbox and only after
the tractor has come to a complete stop.
The reverse gear unit does not provide for the neutral position of the train of synchro-
nizer 2, therefore, either forward or reverse gear is constantly engaged in the reverse gear
unit.