SECTION 00 - INTRODUCTION
7
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 designed
position before tightening the connections. Clamps
should be tightened sufficiently to hold the hose with-
out crushing and to prevent chafing.
After hose replacement to a moving component,
check that the hose does not foul 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 productiv-
ity of the components being served. Connectors
which show signs of movement from the original po-
sition have failed and will ultimately separate com-
pletely.
A hose with a frayed outer sheath will allow the water
penetration. Concealed corrosion of the wire rein-
forcement will 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 deteri-
orates and total hose failure soon occurs.
Kinked, crushed, stretched or deformed hoses gen-
erally suffer internal structural damage which can re-
sult in oil restriction, a reduction in the speed of
operation and ultimate hose failure.
Free-moving, unsupported hoses must never be al-
lowed to touch each other or related working surfac-
es. This causes chafing which reduces hose life.
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 seal-
ing.
