Wet Service And Park Brakes, Wet Brakes Control; Differential Lock Wet Clutch - Belarus 920.4 Operating Manual

BELARUS-920.4/952.4

2.3.2 Wet service and park brakes, wet brakes control

The service brake is eight-disk. The friction disks 2 (Figure 2.5) are installed on the splined
ends of the rear-axle drive gears 16. The pressure plates 6 are by design similar to ones used in dry
brakes but have a reduced angle of gradient of holes for balls to provide the necessary compressive
force of friction and intermediate disks packs.
NOTE: PRESSURE PLATES OF DRY AND WET BRAKES HAVE THE SAME
OVERALL AND MOUNTING DIMENSIONS, BUT ARE NOT INTERCHANGEABLE. IT IS
STRICTLY FORBIDDEN TO INSTALL DRY BRAKE PLATES TO WET BRAKES AND
VICE VERSA FOR THE SAKE OF SAFETY OF TRACTOR OPERATION.
The intermediate disks 3 (Figure 2.5) are fixed to prevent rotation in housings 1, 13 with
shoulders made on the external circuit. Tightness of oil baths is ensured by O-rings 15, 24, gaskets
10, 14 and rubber hoods 5, 23. The housings have the check plugs 22 and the drain plugs 12.
The BELARUS-920.4/952.4 tractors are equipped with a wet four-disk park brake 8 (Figure
2.5) made in the same housing with the service brake. Parts of the park brake are common with
parts of the service brakes.
The service brake control drive of BELARUS-920.4/952.4 is mechanical, through levers
and pedals. The park brake is driven mechanically.
The service and park brake control drives of wet brakes are principally the same as ones
used for dry brakes of the respective tractor model.
The wet service and park brakes adjustment are performed each 500 service hours of the
tractor in the process of performing MS-2. Techniques of checking and adjusting wet service and
park brake see in Maintenance (Operation 32a) of the 900-0000010 OM.
IT IS FORBIDDEN TO OPERATE BRAKES WITHOUT OIL OR WITH INSUFFI-
CIENT OIL LEVEL.

2.3.3 Differential lock wet clutch

The lock clutch 17 (Figure 2.5) has six discs with metal-ceramic friction pads installed on
the spline hub 18 tied with the axle drive gear 16. The pack of six friction and five intermediate
disks is compressed when oil is delivered under pressure into the diaphragm cavity, the friction
torque developed at that provides locking the rear axle differential. The clutch is made in a single
housing with the service brake, has an oil bath common with it, is sealed with the cover 20 and the
special corrugated hood 23 of the oil supply adapter 21 in the diaphragm working cavity.
Note – Your tractor can be equipped with dry twin-disk or tipple-disk brakes. Information
about the design and adjustments of dry brakes is presented in the 900-0000010 OM document.
30
https://tractormanualz.com/
Operating manual