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CLEANLINESS
Contamination in hydraulic systems is the most frequent cause of malfunction or
failure of hydraulic equipment. Depending upon the nature, size and amount of
contamination it can lead to malfunction or serious loss of efficiency and reduced
life of equipment.
Particle contamination can be of metal, rubber, dirt, sand, paint etc. This is more
likely if poor standards of cleanliness are observed when fitting hydraulic hoses
and pipe work or when filling the hydraulic oil tank.
Fluid degradation can cause deposits to form, which clog and impair the smooth
operation of valve spools, etc. This is due to the combined effects of particle,
wear, air entrapment, and excessive temperatures. If strict cleanliness is
observed this condition should not occur.
When installing pipes and fittings, ensure that they are absolutely clean and free
from dirt, scale, and other contaminants. Pipes should be supplied plugged at
either end and these should not be removed until just before the hoses are
installed. Hoses should be blown through with clean compressed air then
installed immediately.
Ensure that the hoses are in good condition, the correct bend radii for the hoses
are observed and that the hoses are of the correct pressure rating
(As specified on the hydraulic drawing).
Threads should be inspected for burrs, which must be removed before hydraulic
hoses are installed. (The use of Teflon, putty, etc for
sealing
threads must be
avoided). All ports in hydraulic equipment, hoses, pipe work, which is not
immediately connected, should be kept sealed with plugs to prevent the ingress
of dirt.
The hydraulic oil tank should be filled with an ISO 32 grade hydraulic oil which
must be clean and poured through a fine filter to eliminate the possibility of
contamination from the can or from the atmosphere.
Data Sheet : 022
Содержание 300 SVTAH
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