For two-line pneumatic actuator
(MTZ-900.3/920.3/950.3/952.3)
Attach a pressure gauge with the scale
of at least 10 kgf/cm
2
to the connection
head with the yellow cap of the control
line.
Turn the compressor on and pressurize
the air bottle to the value of 7.7-8.0
kgf/cm
2
against air pressure indicator
located on the tractor dashboard. The
pressure gauge attached to the connec-
tion head shall display 0 kgf/cm
2
.
If the pressure exceeds the above val-
ue, proceed as follows:
• Check the presence of the gap “a”
between the pin (5) and the upper
edge of the slots of the levers (7 and
8). The gap shall be 1-2 mm;
• If there is no gap, unsplint and re-
move the pin (5) and adjust the rod
length by rotating the rod end (4).
Check and adjust, if necessary, the pre-
liminary compression of the spring (3) to
the size of 36-38 mm by rotating the
nuts (2), after which lock the nuts.
The preliminary compression of the
spring shall be adjusted so that when
stepping on the service brake pedal or
applying the parking brake, first the
brake valve plunger would move to the
stop and then the spring would be com-
pressed.
If necessary, adjust the brake valve.
To perform the adjustment, disconnect
the rod (1) from the lug (9), remove the
boot (8), unscrew the lug by 2-3 turns
and adjust the air pressure to 0 kgf/cm
2
by turning the nut. Screw the lug into the
nut to the stop and lock it. Put on the
boot and attach the rod.
If the brake valve actuator and the valve
are adjusted properly, when moving the
blocked brake pedals to the full travel or
applying the parking brake to fixation at
the 2
nd
or 4
th
tooth, the pressure as indi-
cated by the pressure gauge attached to
the connection head shall increase to
6,5-8,0 kgf/cm
2
.
Disconnect the pressure gauge from the
connection head.
If the specified adjustment does not en-
sure said pressure parameters, take the
brake valve away and send it for repair.
IMPORTANT! When the brake valve
actuator and the valve are adjusted
properly, the pressure as indicated by
the pressure gauge attached to the
connection head in the single-line drive
shall decrease to zero and in two-line
drive shall increase to 6.5-8.0 kgf/cm
2
when stepping on the blocked pedals
to the full travel as well as when apply-
ing the parking brake.
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