MTZ 1220.1/1220.3
Section D. Construction and Operation
D63
Measuring Pump
The measuring pump (Fig. E-41) consists
of a pumping unit (I), distributor (II), a non-
return valve (9), two anti-shock valves (7),
safety valve (6) and two anti-vacuum
valves (8).
The safety valve (6) limits maximum pres-
sure in the oil discharge duct to within
14…15 MPa (140…150 kgf/cm
2
).
The anti-shock valves (7) limit pressure in
the cylinder ducts in case of impact loads.
Pressure setting for the anti-shock valves
is within 20…21 MPa (200…210 kgf/cm
2
).
The anti-vacuum valves (8) make it
possible to ensure supply of the required
amount of working fluid to the hydraulic
cylinder in an emergency and on opera-
tion
of
the
anti-shock
valves
Fig. D-41. Measuring pump (exploded view):
1 – stator; 2 – rotor; 3 – slide valve; 4 – driven shaft; 5 – sleeve; 6 – safety valve; 7 – anti-
shock valve (2 off); 8 – anti-vacuum valve (2 off); 9 – non-return valve; 10 – casing;
I – pumping unit; II – distributor
2.10.3 Steering hydraulic cylinder
The steering hydraulic cylinder
consists of body (3) (figure
Д
-42), a rod
(4), a piston (1), a front cover (6) and a
cap nut (8). The piston is fixed on the rod
with a nut (15), which is locked by punch-
ing of the land in rod slots. In eyes of the
body and the rods, spherical bearings (7),
that have channels in the inner race for
lubrication of friction surfaces through the
oiler in the pin, are installed. In the cover
(6) a collar (9) (wiper seal), rod guides
(13), that exclude friction of the rod and
the cover, and rod packings (10) are in-
stalled. An integrated seal (14), that ex-
cludes friction of the piston and cylinder
liner, is mounted on the piston.
Summary of Contents for 1220.1
Page 1: ...MTZ 1220 1 1220 3 1220 1 0000010 OM OPERATOR S MANUAL 2010...
Page 161: ...MTZ 1220 1 1220 3 Section I Coupling of implements I15...
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