Belarus 1523, Operating Manual

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BELARUS-1523/1523 В /1523.3 /1523В.3 Construction and Operation
81
The gearbox is a mechanical fixed-ratio
constant-mesh transmission, with 4 for-
ward ranges and 2 backward ranges,
with intra-range shift of gears by means
of synchronizers. It provides 16 forward
speeds and 8 reverse speeds as well as
driving of the front drive axle and the
synchronous PTO.
Gearbox Structure
The gearbox consists of a drive gear as-
sembly, shaft of reduced speeds and re-
verse, gear cluster, secondary shaft,
control mechanism, hydraulic system,
and gearbox housing.
The drive gear assembly consists of a
primary shaft (1) with free-installed pin-
ions (3, 8, 11, 14) supported in bearings
(9) and (74). Two bushings (5) are
splined on the shaft. The bushings carry
cone synchronizers (7). The shaft is sup-
ported in bearings (2) and (29).
The driven gears (63), (65), (66), (69) are
fitted on the intermediate shaft (67) in-
stalled in the housing in two bearings
(35) and (70) with a slight pre-load.
A pack of gears in assembly with bear-
ings is tightened up on the shaft with a
nut (71). The shaft of reduced gears and
reverse is installed in the gearbox hous-
ing supported in the bearings (49) and
(58). The same shaft carries the gear
(54) of the first and second ranges and
the gear (50) is the reverse one. A bush-
ing (55) with internal and external splines
and a creeper pinion (56) installed
thereon, sits on the shaft splines. A
driven gear (57) is installed on the shaft
through a bronze bushing. If a super-
charger is not supplied, the gear (57) is
connected to the shaft through splines of
the gear (56) fixed in this position by
means of a check ring on the bushing
(55).
The drillings, axial and radial, are made
in the shaft for feeding the lubricant to
bearings (51) and gear (57) bushing.
The pinions (37) and (44) are installed on
the splines of the gear-cluster shaft (41).
This shaft is supported in the bearings
(77), (39) and (40). The back mount of
the shaft is located in the gear (42) hub
of the synchronous PTO drive, in two
roller bearings (39) and (40). The gear
(42) is supported in the housing in a
bearing (38).
The secondary shaft (28) made as an in-
tegral part with the driving bevel gear is
supported in the housing in tapered bear-
ings (27) and (33).
The driving pinion (24) of the front drive
axle is fixedly fitted on the shaft with a
driven gear (23) supported in bearing
(36) on the pinion hub, semi-coupling
(21) and bushing (19) with a driven gear
(20) installed thereon. The bushing (19)
with a bearing pressed on it is held from
pivoting by a stop. The pack of parts on
the shaft is tightened up with the nut
(30). The axial and radial drillings in the
shaft are intended for lubricating the
bearings (36) and (27).