MTZ 1220.1/1220.3
Section D. Construction and Operation
D32
Rear PTO
The rear PTO is provided with the two-
speed independent (540 and 1,000 rpm)
and synchronous (4.18 revolutions per
metre en route) drives.
The independent drive is provided from
the bearing disk of the clutch via a two-
speed PTO drive reduction gear, inner GB
shaft (18) (Fig. E-14), drive shifting clutch
(27) (Fig. E-22) onto the crown gear shaft
(26) of the PTO epicyclical reduction gear.
The synchronous drive is provided via
the shift clutch (27) which couples the epi-
cyclical reduction gear shaft (26) with GB
pinion.
The epicyclical PTO reduction gear is lo-
cated in the rear axle housing and con-
sists of the crown gear (22) coupled with
shaft (26), three satellites (23) on axles
(21), cage (25) and sun gear (24).
The sun gear (24) is connected with the
engagement drum (17) through a spline
joint. The drum is connected to shaft (20)
and forms, together with the brake band
(16), an engagement band brake.
The cage (25) is made integral with the
brake drum (19) connected with the shaft
(2) and forms, together with the brake
band (18), an engagement band brake.
The inner bore of the shaft (20) houses
replacement PTO end-pieces (10) – 8
spline (540 rpm) or 21 spline (1000 rpm).
The roller (3) of movable ends of the
brake band has an eccentric with lever (5)
to effect adjustment of the clearance in the
band brakes from outside, by simple rota-
tion of the roller (3).
The rear axle casing houses two adjusting
screws (11). These are connected to the
control roller (6) and levers (4), (5).
The PTO is engaged when the brake
band (16) is tensioned and the brake band
(18) is released. In this case, the en-
gagement drum (17) and the sun gear
(24) connected thereto are brought to rest.
Rotational motion is transferred from the
crown gear (22) to the cage (25) and PTO
shaft (20) through satellites (23) running
about the stopped sun gear (24).
The PTO is disengaged when the brake
band (18) is tensioned and the brake band
(16) is released. In this case the PTO re-
placement end-piece is brought to stand-
still (10).
Содержание 1220.1
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