Service Techniques - New Holland TV145 Repair Manual

SERVICE TECHNIQUES

GENERAL
Clean the exterior of all components before carrying
out any form of repair. Dirt and abrasive 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
operation.
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 personal 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 condition. 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
SECTION 00 – GENERAL INFORMATION
00-15
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 twisted.
Hose connections which are damaged, dented,
crushed or leaking, restrict oil flow and the
productivity of the components being served.
Connectors which show signs of movement from the
original swagged position have failed and will
ultimately separate completely.
A hose with a chafed outer cover will allow water
entry. 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
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 ultimate 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.