KIROVETS K-744R1, K-744R2, K-744R3, K-744R4 tractors
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Elimination of leaks in pipelines, hoses and seals of hydraulic units of the hydraulic
systems for steering control and of the linkage
When there are leaks in seals of low-pressure hoses, execute the following operations:
a) dismantle the low-pressure hose, having drained the working fluid from hydraulic
system pipelines;
b) check the quality of internal surface of the hose, replace it if any damage is detect-
ed,
c) examine the pipeline surface and “zigs” on the pipe; if any surface damage is de-
tected, file the damaged area and grind the sealing surface;
d) install the hose and tighten the clamps again in the prescribed order.
In case of leaks in unions and angles of hydraulic units, perform the following operations:
a) take off the union or angle;
b) remove rubber rings and thoroughly see for the absence of cuts or tears on their
working surface; if the defects above are detected, replace the ring;
c) examine the surfaces being sealed; if any notches, signs of treatment are detected,
dress them by scraper and grind them;
d) wash the surfaces being sealed with diesel fuel;
e) assemble the union or angle with nut and rubber rings, lubricate the sealing sur-
face in the housing with oil and screw the union or angle into the housing until the nut
contacts the housing, avoiding cuts of the ring being sealed. Perform final installation
of the angle with the nut being in fixed position.
In order to prevent leakage in the hydraulic system during operation, it is necessary to take
into account the following:
- tightening of high-pressure pipe connections and hoses with one wrench without
supporting the second connection element is not allowed and can lead to destruction
of welded joints of pipelines as a result of deformation;
- when dismantling low-pressure hoses, it is necessary to avoid damage of the inter-
nal rubber layer;
- leak-tightness of round-section rubber rings providing seals for parts of hydraulic
system units depends upon cleanness of sealing surfaces, conservation of ring integ-
rity upon mounting and depth of installation grooves;
- most leaks cannot be eliminated by tightening.
