Advertisement
1.3
Gaskets and mating surfaces
Leaking sealing faces can mostly be traced back to in-
correct assembly of seals and gaskets.
Before assembling a new seal or gasket make sure
l
that the sealing surface is free of pitting, flutes, cor-
rosion or other damage.
Inappropriately stored or handled seals (e.g. hang-
l
ing from hooks or nails) must under no circumstanc-
es be used.
Assemble seals and gaskets only with sealing com-
l
pound, grease or oil, if this is specifically specified
in the repair instructions.
If necessary remove any old sealing compound be-
l
fore assembling. For this purpose do not use any
tools that could damage the sealing surfaces.
Sealing compound must be applied thin and evenly
l
on the corresponding surfaces; take care that the
compound does not enter into oil galleries or blind
threaded bores.
Examine the contact faces for scratches and burrs,
l
remove these with a fine file or an oilstone; take
care that no grinding dust and dirt enters into
tapped bores or enclosed components.
Blow out lines, ducts and gaps with compressed air,
l
replace any O-rings and seals that have been dis-
lodged by the compressed air.
Assembly of radial seals
Fig. 3
Lubricate the sealing lips (2) (Fig. 3) with clean
l
grease; in case of double seals fill the space be-
tween the sealing lips with a generous amount of
grease.
Slide the seal over the shaft, with the lip facing to-
l
wards the fluid to be sealed.
i
Note
If possible, use an assembly sleeve (1 (Fig. 3)), to
protect the lip from being damaged by sharp edg-
es, threads or splines. If no assembly sleeve is avail-
22
able, you should use a plastic tube or adhesive tape
to prevent the sealing lip from being damaged.
Lubricate the outer rim (arrow 3 (Fig. 3)) of the seal
l
and press it flat on the housing seat.
Fig. 4
Press or knock the seal into the housing, until it is
l
flush with the housing surface.
i
Note
If possible, use a "bell" (1 (Fig. 4)), to make sure that
the seal will not skew. In some cases it may be ad-
visable to assemble the seal into the housing first, be-
fore sliding it over the shaft. Under no circumstances
should the full weight of the shaft rest on the seal.
If you have no proper service tools at hand, use a suit-
able drift punch with a diameter which is about 0,4 mm
smaller than the outer diameter of the seal. Use VERY
LIGHT blows with the hammer if no press is available.
BOMAG
General repair instructions
008 922 89
Advertisement
