Mahindra JINMA-200 Operation Manual page 53

valve seat spring, and reseal the passage between receive and the left and right brake air
chamber of the trailer. At this moment the waste gas (compressed air) in left and right air
chamber will go into the air through pipes, hole B of brake valve, inner hole of core rod and
inner hole C of tappets.(Fig.4-24).
2) Use and adjustment of air brake device of trailer
① During working of air compressor, if the air pressure is too low, seal performance of
exhaust valve should be checked, and cleaned or ground if necessary. If the air compressor
has worked for 24 hours, and the oil gathered in the receiver is more than 15-20ml, the wear
condition of the piston rings of air compressor should be checked, and it should be replaced if
necessary. The air compressor should be checked or be filled with oil after every ten hours'
work.
② Use and maintenance of brake valve
During using if the air pressure of receiver drops too fast, and all the pipe connectors are
confirmed to have no air leak, then screw out the valve cover connector 1 (Fig.4-24), clean the
gathered dust on the surface of the rubber of valve seat assembly 3, and slightly grind the
compressed prints on fine abrasive cloth if necessary. Generally after 1000 hours' work of the
valve, should dismantle and clean all the parts, grind the valve seat, adjust the maximum
pressure of brake, and check the seal performance after assembling.
③ Adjustment of brake pressure
When the brake pedals are stepped into the lowest place, the maximum pressure of the
air entered into the brake air chambers of trailer should be 0.45-0.5MPa. During adjustment,
connect an air pressure gauge in the pipes which pass through brake air chamber, rotate the
adjusting bolt 12 to contact tappet 9 according to Fig.4-24, then step on the pedals again to
the lowest position, if the numerical value on the air pressure gauge is lower than 0.45Mpa,
then use nut to lock the limiting bolt tightly.
④ Adjustment of brake time
The brake time of trailer should be basically synchronous with the brake time of the
tractor, otherwise it should be readjusted; adjust connecting rod 8 (Fig.4-23) to add its length,
the brake time of trailer will advance; adjust connecting rod 8 and reduce its length, the
brake time of trailer will extend. Generally the brake time of air brake trailer should be a bit
shorter than the brake time of tractor.
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