Operating Manual
1. Replace shaft abutment spacer into the
front bottom bearing housing of the
gearcase, between the front bearing and
the housing.
2. Fit auxiliary shaft into gearcase.
3. Fit drive shaft into gearcase.
4. Fit seal retainers to the gearcase without
silicon sealant at this stage, and torque
the cap screws to their recommended
value.
5. Fit rotors or shaft abutment blocks to the
shafts and torque the rotor torque locking
assemblies to the recommended value.
6. Using a depth micrometer measure from
the front face of the bottom rotor to the
front face of the top rotor, and record the
axial displacement of the rotor abutment
shoulders. When measuring off a pair of
rotors it is important to compensate for
any small differences there may be in the
rotor lengths.
7. The axial displacement should be less
than 0.012mm, if it is not the bottom shaft
should be removed and the spacer ground
or an appropriate spacer fitted to give a
axial displacement of not greater than
0.012mm.
8. Once both shaft shoulders are within
tolerance of each other, remove both seal
retainers, fit the front oil seals, apply silicon
sealant to the retainer face and torque up.
Recheck to ensure alignment.
9. With the shafts installed the timing gears
and front end of the pump can be refitted.
The pump should now be timed, as
previously described.
0.012
0.000
10.10 Shaft Replacement
Gearboxes are assembled with the top shaft
bearing located against a machined surface in
the bearing housing, and the bottom shaft
bearings butting against a spacer fitted into the
front bearing housing. When a new gearbox is
being built this spacer is initially oversized,
such that the axial displacement in the rotor
abutment shoulders can be measured and the
appropriate spacer fitted, or the existing spacer
ground to suit. When rebuilding a used gearbox
the axial displacement should be checked,
however, it will normally be within tolerance,
0.012mm.
Rotor Abutment Alignment
Note : The axial displacement can be in either
direction as long as it is within tolerance.
Rotor or
Abutment
Block
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