Belarus 1822.3, Руководство оператора

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2022.3-0000010 OM
97
3.6 Rear power takeoff shaft
3.6.1 General information
The rear PTO has a four-speed separate drive that provides two speed modes
(standard and economy) by reduction switching in the coupling body, and two rotation
speeds of the PTO end extension – by replacing the end extension 16 (figure 3.6.1) in the
rear PTO reduction unit. The PTO is driven by the engine through two pairs of spur con-
stant-mesh gears in the coupling body, through the gearbox inner shaft, the friction clutch
and the PTO reduction unit. The PTO drive is engaged and disengaged by a splined clutch
1.
The power takeoff shaft is installed in the rear axle body and consists of a driven 22
and drive 23 gears, located coaxially and interconnected by means of three equally-
located intermediate gears 9, fitted on the centers 7, pressed into the reduction housing
10.
The drive and driven gears have splined holes, by means of which they can be con-
nected with splined journals of the respective end extensions depending on the shaft end
extension turning speed required:
o
540 rpm with gear 22;
o
1000 rpm with gear 23.
The shaft end extensions have marks on their ends – “540” and “1000”, accord-
ingly.
The shaft end extensions are mounted on tapered roller bearings 18 and locked
against axial movement with a thrust washer 13, secured by four bolts. Changing the ex-
tension remove the washer 13, change the extension 16 and fix the thrust washer 13.
The PTO is engaged and disengaged by the multi-disk friction clutch and the PTO
brake. On the outer splines of the friction clutch drive shaft 2 disks 3 with metal-ceramic
linings are mounted, and in slots of a drum 5, connected with the reduction drive gear 23
by means of splines, steel disks 4 are mounted. As the PTO is engaged, a piston 26 com-
presses the disks under oil pressure, thus joining the PTO reduction unit with the drive
shaft 2. As the friction clutch is disengaged the piston 26 returns to its initial position under
the pressure of the springs 27. The PTO end extension is stopped by the PTO brake. The
brake is mounted in the reduction housing 10 and consists of a piston 24, a friction disk 6
and a thrust disk 25. The friction disk 6 is installed on splines of the drum 5. As pressure is
fed into the brake booster, the piston 24 compresses the disks 6 and 25, braking the drum
and the PTO end extension.
The axial clearance in the tapered roller bearings 18 shall not exceed 0,1 mm. The
adjustment is carried out matching rings 19. The nut 21 is tightened with a torque of 220
Nm.
Setting the PTO speed switch into position “standard mode” (figure 3.2.7) by replac-
ing the end extensions, as specified above, two standard turning speeds of PTO extension
are obtained (540 and 1000 rpm).
Setting the PTO speed switch into position “economy mode” by replacing the end
extensions two additional turning speeds of PTO extension are obtained (770 and 1460
rpm).
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