MTZ 1220.1, Руководство оператора

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MTZ 1220.1/1220.3 Section H. Adjustments
H13
Fig. H-7 Checking and adjusting brake
valve drive of pneumatic drive
Check and, if necessary, adjust the
pneumatic system brake valve two-
cable drive as follows.
1. Connect a pressure gage with a
scale of 1 MPa min. to the coupling head
with a yellow cap of the control manifold.
2. Turn on the compressor, start the
engine and fill the cylinder with air to a
pressure of 0.77 to 0.8 MPa as per the air
pressure gage located on the instrument
panel of the tractor. Air pressure as per
the pressure gage connected to the coupl-
ing head must be 0 MPa. If it is higher
than specified, proceed as follows:
- check availability of the clearance A
between the finger (5) (Figure H-7) and
the upper edge of the grooves in the arms
(6 and 7). The clearance must be 1 to 2
mm;
If there is no clearance, remove the cot-
ter pin and remove the finger (5) and ad-
just the length of the arm by turning the
end (4).
- check and adjust as necessary pre-
compression of the spring (3) to a size of
36…38 mm by rotating the nuts (2), then
lock the nuts. Adjust the spring precom-
pression so that when you press the ser-
vice brake pedal or engage the parking
brake, first the brake valve rod moves until
it stops, and then the spring compresses.
- if the brake valve drive is properly ad-
justed and the brake valve is in good con-
dition, then when the blocked brake pedals
move to a full travel or the parking brake is
engaged up to its lock on the second-
fourth tooth, the pressure as per the pres-
sure gage connected to the coupling head
must increase to 0.65 to 0.8 MPa;
- disconnect the gage from the coupling
head.
If the mentioned adjustments do not pro-
vide the above pressure parameters, then
unmount the brake valve and send it for
repair.