INTRODUCTION
Hoses and tubes
Always replace hoses and tubes if the cone end or the
end connections on the hose are damaged.
When installing a new hose, loosely connect each end
and make sure the hose takes up the correct position be-
fore tightening the connections. Clamps should be tight-
ened sufficiently to hold the hose without crushing and to
prevent chafing.
After replacing a hose on a moving component, check that
the hose does not fall by moving the component through
the complete range of travel. Be sure any hose which has
been installed is not kinked or twisted.
Hose connections which are damaged, dented, crushed
or leaking, restrict oil flow and the productivity of the com-
ponents being served. Connectors which show signs of
movement from the original position have failed and will
ultimately separate completely.
A hose with a frayed outer sheath will allow water penetra-
tion. Concealed corrosion of the wire reinforcement could
subsequently occur along the hose length with resultant
hose failure.
Ballooning of the hose indicates an internal leakage due to
structural failure. This condition rapidly deteriorates and
total hose failure soon occurs.
Kinked, crushed, stretched or deformed hoses generally
suffer internal structural damage which can result in oil
restriction, a reduction in the speed of operation and ulti-
mate hose failure.
Free-moving, unsupported hoses must never be allowed
to touch each other or related working surfaces. This
causes chafing which reduces hose life.
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O-rings
Replace O-rings, seal rings and gaskets whenever they
are disassembled.
Never mix new and old seals or O-rings, regardless of
condition. Always lubricate new seal rings and O-rings
with hydraulic oil before installation to relevant seats.
This will prevent the O-rings from rolling over and twisting
during mounting which will jeopardize sealing.
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