Case 580SR Service Manual page 21

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All maintenance and repair operations described in
this manual should be carried out exclusively by au-
thorized workshops. All instructions detailed should be
carefully observed and special equipment indicated
should be used if necessary. Everyone who carries out
service operations described without carefully observ-
ing these prescriptions will be directly responsible of
deriving damages.
GENERAL
Clean the exterior of all components before carrying
out any form of repair. Dirt and dust can reduce the
efficient working life of a component and lead to
costly replacement.
Time spent on the preparation and cleanliness of
working surfaces will pay dividends in making the
job easier and safer and will result in overhauled
components being more reliable and efficient in op-
eration. Use cleaning fluids which are known to be
safe. Certain types of fluid can cause damage to O-
rings and cause skin irritation. Solvents should be
checked that they are suitable for the cleaning of
components and also that they do not risk the per-
sonal safety of the user. Replace O-rings, seals or
gaskets whenever they are disturbed. Never mix
new and old seals or O-rings, regardless of condi-
tion. Always lubricate new seals and O-rings with
hydraulic oil before installation. When replacing
component parts, use the correct tool for the job.
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 connection. Clamps
should be tightened sufficiently to hold the hose
without 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 twist-
ed. Hose connections which are damaged, dented,
crushed or leaking, restrict oil flow and the produc-
tivity of the components being served. Connectors
which show signs of movement from the original
swagged position have failed and will ultimately sep-
arate completely.
A hose with a chafed outer cover will allow water en-
try. Concealed corrosion of the wire reinforcement
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 dete-
riorates and total hose failure soon occurs.
SECTION 01 - MAINTENANCE
Kinked, crushed, stretched or deformed hoses gener-
ally suffer internal structural damage which can result
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-RING FLAT FACE SEAL FITTINGS
When repairing O-ring face seal connectors, the fol-
lowing procedures should be observed.
S
Never disconnect or tighten a hose or tube that is
under pressure, if in doubt, actuate the operating le-
vers several times with the engine switched off prior
to disconnecting a hose or tube.
Release the fittings and separate the hose or tube as-
sembly, then remove and discard the O-ring seal from
the fitting. Dip a new O-ring seal into clean hydraulic oil
prior to installation. Install a new O-ring into the fitting
and, if necessary, retain in position using petroleum jel-
ly. Assemble the new hose or tube assembly and tight-
en the fitting finger tight, while holding the tube or hose
assembly to prevent it from turning. Use two suitable
wrenches and tighten the fitting to the specified torque
according to the size of the fitting.
NOTE: to ensure a leak-free joint is obtained, it is
important that the fittings are not over or under
torqued.
SHIMMING
At each adjustment, select adjusting shims, meas-
ure them individually using a micrometre and then
sum up recorded values.
Do not rely on measuring the whole shimming set,
which may be incorrect, or on rated value indicated
for each shim.
ROTATING SHAFT SEALS
To correctly install rotating shaft seals, observe the
following instructions:
Z let the seal soak into the same oil as it will seal for
at least half an hour before mounting;
Z thoroughly clean the shaft and ensure that the
shaft working surface is not damaged;
WARNING
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