Oil Seals - New Holland TI4.70 RS Service Manual

1.6.1 Oil seals

1.6.1.1 General instructions and
guidelines
Normally, one gasket is sufficient to ensure seal
tightness. The seal lip must face towards the
fluid retained or the pressurised side.
Do not allow mechanical parts to come
into contact with the seal lip as this would
compromise seal tightness and significantly
reduce the lifespan of the gasket.
Lubricate the seal ring thoroughly before
installing to prevent the seal from operating dry
during the first revolutions of the shaft.
Grooved seal rings must be lubricated with oil
and not grease, as grease would fill the grooves
and render them ineffective.
1.6.1.2 Assembly
1 - When fitting gaskets on the shaft, check that
there is a bevelled guide edge on the shaft.
2 - Protect the seal lip against damage caused
by threads, recesses, sharp edges, keying
slots etc; cover these parts of the shaft
appropriately when fitting the gasket.
3 - Preferably use a hydraulic or mechanical
press to install the gasket in its seat.
4 - The installing force must be applied as closely
as possible to the outer diameter of the
gasket, ensuring that the gasket itself remains
perfectly perpendicular to the hole during
installation.
5 - Do not use adhesive to fix the gasket in
its seat. Even if all possible precautions are
taken, there is a risk of adhesive fouling the
seal lip, causing damage to the gasket and
fluid leakage even from the first revolutions
of the shaft.
INTRODUCTION
1-42
Fig. 1.12
Fig. 1.13