Parking Brake - Belarus 1822.3 Operator's Manual

3. Fill (or add) the hydraulic system control circuit of reversing gear brakes with
brake fluid and bleed it, doing the following operations:
- remove protective casing 2 (figure 3.8.8) and fill the compensation chamber " " of
main brake cylinder of reversing gear 3 with brake fluid up to the level of 10...15mm from
the upper edge of the chamber;
- take off caps from operating brake cylinders overflow valves, put a pipe on over-
flow valve 5 head of left operating cylinder 4, and a loose end of the pipe shall be put into
a transparent container with capacity of at least 0.5l half filled with brake fluid;
- press reversing gear brake pedal 1 from four to five times and keeping the pedal
pressed unscrew the left operating cylinder valve for 1/2... 3/4 revolutions, and after the
pedal full travel when part of fluid with air disappears from the system, it is required to
screw in the valve and release the pedal. Press the pedal quickly, release smoothly. Re-
peat this operation several times until complete air removal from the system. Take off the
pipe from the valve and put on a protective cap.
- bleed the right brake drive in the same order;
- fill the compensation chamber " " of main brake cylinder of reversing gear 3 with
brake fluid up to the required level, put on protective casing 2.
Check the hydraulic system bleeding for forward motion according to clause 4 of
subsection 3.8.3 "Service brake adjustment of "BELARUS-1822 .3/2022 .3".
1 – reversing gear brake pedal; 2 – casing; 3 – main brake cylinder of reversing
gear; 4 – left operating cylinder; 5 – overflow valve head;
Figure 3.8.8 – Hydraulic system control bleeding of reversing gear brakes

3.8.6 Parking brake

As a parking brake the service brakes with independent manual rear wheel drive
are used.
The actuator consists of a drawing mechanism 5 (figure 3.8.9), mounted an axle 6,
fixed on the side wall of the cab to the left of the operator's seat and of a mechanical gear,
that includes a lever 2, which is free fitted on a brake shaft 10 with its hub, levers 11 and
20, keyed with the shaft.
A plate 1 is welded to the lever 2, an adjusting bolt 4, screwed in the lever 20 of the
left brake, is stopped against the plate.
Levers 11 and 20 are connected by means of links 13 and 16 with double-arm lev-
ers 14 and 17, fixed on splined ends of the left and right brake shafts, the lower arms of
this levers are connected with working cylinder 15, 18 rods.
When drawing the rod 3 with the handle 9 of the drawing mechanism, the force is
transferred to the lever 2 and from its stop member 1 to the bolt 4, hereby turning the lever
20 and the shaft 10 with the lever 1, interconnected with the lever 20 by means of a key,
the links 13 and 16, the brake levers 14 and 17, thus moving the service brake pressure
disks. Turning towards each other and running with tapered surfaces of profile grooves on
the balls the pressure disks move apart, compressing the brake disk packs and braking
the pinion gears of the rear axle drives.
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