Disassembly / Reassembly Of Bearings And Shims - Pratissoli HF Serie Manual De Reparación

- Mount the rear cover complete with the O-ring,
positioning the dipstick hole upward.
Insert oil in the casing as indicated in the Use and
-
maintenance manual.
2.1.3

Disassembly / Reassembly of bearings and shims

The type of bearings (taper roller) ensures the absence of
axial clearance on the bend shaft. The shims are defined to
meet this necessity. For disassembly / reassembly and for any
replacements, carefully observe the following directions:
A) Disassembly / Reassembly of the bend shaft without
replacement of the bearings
After having removed the side covers as indicated in par. 2.1.1,
check the conditions of the rollers and their relative tracks. If
all parts are in good condition, clean the components carefully
with a degreaser and redistribute lubricant oil uniformly.
The previous shims can be reused, taking care to insert them
only under the indicator side cover.
Once the complete unit is mounted (Indicator side flange
+ shaft + motor side flange), check that the rotation torque
of the shaft - with the con-rod disconnected - is a minimum
4 Nm, Max 7 Nm.
To transition the two side covers closer to the casing, it is
possible to use 3 M6x40 screws for the first positioning
phase as indicated in Fig. 8 and the screws provided for final
fastening.
Shaft rotation torque (with the con-rod connected) should not
exceed 8 Nm.
B) Disassembly / Reassembly of the bend shaft with
replacement of the bearings
After having removed the side covers as indicated in par. 2.1.1,
remove the outer ring nut of the bearings from the relative
covers and the inner ring nut with the remaining part of the
bearing from the two ends of the shaft by means of a normal
"pin punch" or a similar tool as indicated in Fig. 12, Fig. 12/a
and Fig. 13.
Fig. 11/c
The new bearings can be mounted cold with a press or rocker,
supporting it on the lateral surface of the ring nuts involved
in press fitting with the rings. The press fitting operation can
be facilitated by heating the involved parts to a temperature
between 120 °C - 150 °C (250 °F - 300 °F), ensuring that the
ring nuts fit fully into their seats.
Never exchange the parts of the two bearings.
Determining the shim pack:
Perform the operation while the piston/con-rod guide units
are assembled, the con-rod caps are disconnected and the
con-rods are pushed downwards. Insert the pump shaft
without tab into the casing, making sure the PTO shank comes
out of the correct side.
19
Fig. 12
Fig. 12/a
Fig. 13