Checking and adjusting the pneumat-
ic system pressure regulator
After 1000 hours of operation of the
tractor (M-3), in case of malfunction of
the pressure regulator, as well as after
its disassembly for washing or replace-
ment of worn-out parts, perform the ad-
justing operation as follows:
• Attach a pressure gauge with the
resolution of 0.1-0.2 kgf/cm
2
and
scale of at least 16 kgf/cm
2
to the bot-
tle for the period of verification and
adjustment.
• Remove the cap (1).
• Using a spanner, screw the cover (2)
into the casing to the stop.
• Start the engine. Turn on the com-
pressor and fill the bottle with com-
pressed air so that the safety valve
(6) would operate at 8.5-10 kgf/cm
2
. If
the valve operates at a pressure ex-
ceeding the said limits, adjust it by
means of the screw (8), having pre-
liminary loosened and then tightened
the lock nut (7).
• Adjust the force of the springs (3, 4)
by unscrewing gradually the cover (2)
in such a way that the air pressure in
the bottle at which the overload valve
(5) opens would be 7.7-8.0 kgf/cm
2
• Fix this position of the cover (2) by
applying paint to the treaded part of
the casing and put on the cap (1).
• Open slightly the condensate remov-
al valve in the bottle and reduce the
air pressure to 6.5-7.0 kgf/cm
2
. At
these values, the valve (5) shall be-
come closed and switch the com-
pressor to filling the bottle with com-
pressed air.
• Disconnect the reference pressure
gauge from the bottle.
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