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10
GENERAL NOTICES
Clean the outside of all the components prior to per-
forming any type of repair. Dirt and abrasive dust can
reduce the efficient life expectancy of a component
and result in expensive repairs.
The time spent in preparing and cleaning working
surfaces is giving results, making work easier and
safer, and the components overhauled will be more
reliable and operate better.
Use cleaning fluids proven to be safe. Some types of
fluid can cause serious problems to O--Rings and irri-
tate the skin. It is necessary to check that the sol-
vents are suitable to clean the components and that
of they are free of risks for the health of workers.
Replace O--Rings, sealing rings and seals every time
they are moved. Never use old O--Rings or seals and
new ones together, independently from their condi-
tions. Always lubricate new O--Rings and seals with
hydraulic oil before installing them.
When replacing components, always use the tooling
required by this type of work.
HOSES AND STEEL PIPES
Always replace hoses and steel pipes when the taper
end or connections are damaged.
When a new hose is installed, connect it without
tightening the ends and make sure that it is routed in
the correct manner, before tightening the ends. Fix-
tures must be tightened just enough to hold the hose
without squeezing it, avoiding rubbing as well.
After replacing a hose of moving components, make
sure that the hose is not disturbed by the movement
of the component in any position.
Make sure that all hoses installed are not choked or
bent.
If hose connections are damaged, dented, choked or
leaking, decrease the flow of oil and the productivity
of the relevant actuators. Connections showing
signs of displacement from their original pre--
pressed position must be considered as already
broken, since they are going to fail or separate soon.
A hose with a ragged outer sleeve allows water to
penetrate. Thus, hidden corrosion of the reinforcing
wire will develop along the entire length of the hose,
with the subsequent failure of the hose itself.
604.13.542.01 - - 03 - - 2006
SECTION 00 - - GENERAL
MAINTENANCE TECHNIQUES
If a hose swells, this indicates that there is an internal
leakage due to a structural failure. This condition
deteriorates very quickly and causes the failure of
the hose.
Clogged, squeezed, excessively tensioned or
deformed hoses are generally easily subject to flow
reduction, decrement of the operational speed of the
fluid and the final failure of the hose.
Loose hoses move freely and must be prevented
from touching each other and nearby surfaces. This
causes a rubbing action shortening the useful life of
the hose.
CONNECTIONS WITH FRONT SEALING
O- - RINGS
When repairing connections with front sealing
O--Rings, please comply with the following pro-
cedures.
WARNING:
NEVER
TIGHTEN A HOSE OR A STEEL PIPE UNDER
PRESSURE. IF IN DOUBT, MOVE THE CONTROL
LVERS SEVERAL TIMES WITH THE ENGINE
INOPERATIVE BEFORE DISCONNECTING A
HOSE OR A STEEL PIPE.
1. Loosen the connections and separate the hose
or steel pipe, then remove and eliminate the
O--Rings from the connection.
2. Dip a new O--Ring in clean, hydraulic oil before
installing it. Install the new O--Ring in the con-
nection and, if necessary, hold it in its position
with vaseline.
3. Install a new hose or steel pipe and tighten man-
ually the connection holding, at the same time,
the pipe still to prevent it from turning.
4. Use two wrenches to tighten the connection to
the torque prescribed for its size. Please refer to
the table to follow for the tightening torques.
NOTE: to ensure that a joint does not leak, it is
important that the connections are neither
excessively tightened nor too little.
Copyright © New Holland
DISCONNECT,
NOR
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