Plungers Oil Seals - Bertolini LIGHT DUTY Serie Manual Del Usuario

picture 9).
If you do not have a packing extractor you can use expansion pliers.
Assembly
5. Clean and lubricate the glands.
6. Install the new seal in the head housing previously lubricated, taking care not to damage the ex-
ternal lip of the seal.
7. Replace the seals or the complete packing assemblies as needed; consider that the brass
glands must be replaced only in case of visible wear marks. The picture 10 shows a generic
packing assembly; the components are not the same for all series, follow the parts list and the
breakdown supplied with each pump.
8. Lubricate the plungers with waterproof grease. Reassemble the head focusing on the plungers
using a plastic hammer. Tighten the screws:
o M10 to 40Nm torque for PUMPS C53.2,
o M12 to 70Nm torque for PUMPS C40-C75-C-CK.

8.4 plungers oil seals

This operation should be carried once the pump has been dismantled, but to easily take out the oil seals
use a screwdriver with a sharp and shaped end as indicated below (picture 11).
Rotate the pump shaft untill the plunger corresponding to the oil
seal to service is at the bottom dead center (B.D.C.) (picture 12).
Using a screwdriver with a sharp end (picture 11) and a ham-
mer, punch the metal structure of the oil seal (picture 13).
Rotate the screwdriver by 90° so that the pawl is secured on
the oil seal, then push up.
Fit the new oil seal after lubricating with oil or grease both the
internal and external edges.
Push it on its housing using the proper tool (see chart page 25)
Picture 11
55
3mm
Picture 12
Picture 13