Reduction Classes - Pratissoli KF Serie Manual De Reparación

- Fasten the caps to their respective con-rod shanks by
means of M8x1x48 screws (Fig. 10) lubricating both the
underhead and the threaded shank, proceeding in two
different stages:
1. Manually turn the screws until they begin to
tighten
2. Tightening torque
Alternatively, ensure:
1. Pre-tightening torque
2. Tightening torque
- After having completed tightening operations, check that
the con-rod head has a side clearance in both directions.
- Insert the new piston guide seal rings as far as possible
into the relative seat on the pump casing (Fig. 11),
following the procedure described:
use the tool code 27904900 composed of a tapered bush
and a buffer. Screw the tapered bush into the hole in the
piston guide (Fig. 11/a), insert the new seal ring on the
buffer as far as it will go (determined by the height of the
buffer) into its seat on the pump casing (Fig. 11/b), remove
the tapered bush (Fig. 11/c).
RING POS.
2.1.3

Reduction classes

TABLE OF REDUCTIONS FOR BEND SHAFTS AND CON-ROD HALF-BEARINGS
Recovery classes
(mm)
0.25
0.50
30 Nm
10-15 Nm
30 Nm
Fig. 10
Fig. 11
Upper Half-Bearing Lower Half-Bearing
Code
90924100
90924200
- 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.
Grinding on the shaft pin diameter
Code
90924400 Ø49.75 0/-0.02 Ra 0.4 Rt 3.5
90824500 Ø49.50 0/-0.02 Ra 0.4 Rt 3.5
18
Fig. 11/a
Fig. 11/b
Fig. 11/c
(mm)