MTZ K-744R1, Руководство по эксплуатации

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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 and mounted implement control
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 the hydraulic
system pipelines;
b) check the quality of internal surface of the hose, replace it if any damage is detected;
c) examine the pipeline surface and “zigs” on the pipe; if any violation of surface
cleanness is detected, clear the affected area with file and grind the sealing surface;
d) install the hose and again tighten the clamps in the established order.
In case of leaks in the unions and angles of hydraulic units, execute the following operations:
a) remove the union or angle;
b) remove the rubber rings and thoroughly check the absence of cuts or tears on its
working surface; if the above-mentioned defects are detected, replace the ring;
c) examine the surfaces being sealed; if any hair-lines, traces of treatment are detected,
dress them by scraper and grind;
d) wash the surfaces being sealed with diesel fuel;
e) assemble the union or angle with nut and rubber rings, lubricate the sealing surface in
the housing with oil and screw the union or angle into the housing avoiding cutting the
ring being sealed until the nut contacts the housing. Perform final installation of the angle
with the nut being in the 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;
– tightening of the sleeve connection of high-pressure pipes and hoses with a wrench
reinforced by pipe can also lead to deformation of the welded joint of pipe and to its leak;
– at dismantling of low-pressure hoses it is necessary to avoid damage of the internal
rubber layer;