......
For pumps fitted with EBSRAY Mechanical Seals:
7.
Release Mechanical Seal Plate evenly to avoid
damage.
8.
Remove access plug and rotate Shaft until
Drivescrew is accessible, loosen Drivescrew 2 full
turns to clear circlip groove.
9.
The Rotor/Shaft assembly can now be driven
through the pump from the drive end taking care to
adequately support the Rotor end.
10.
Remove Mechanical Seal components taking care
to avoid damage to lapped faces.
10A. If fitted with carbon bearing remove Extraction
Washer and O-Ring.
.....
For pumps fitted with packed glands:
Standard packed glands require correct grade packing
for duty. A Lantern Ring is fitted adjacent to the Rotor
Bearing for suction return and relief of packing pressure.
7. Release
Glandplate.
8.
The Rotor/Shaft assembly can now be driven
through the pump from the drive end taking care to
adequately support the Rotor end.
9. Remove
Glandplate
10.
Using a suitable tool, remove Packing and Lantern
Ring.
11. Remove
Race
Carrier from Bracket.
12. Remove
Outer
Lockring from Race Carrier.
13.
Remove Ball Bearing from Race Carrier.
14.
Remove Lip Seals from Outer Lockring and Race
Carrier.
15.
Remove Body from Bracket if required.
16.
Press out Inner Rotor Bearing and Rotor Bearing if
replacement is required.
4.4
INSPECTION
Inspect components for damage or excessive wear. Note
that typical wear of components in EBSRAY's rotary
Internal Gear positive displacement pumps tend to
compensate each other and working clearances are to
some extent maintained by this compensation. If pump
performance has been satisfactory, existing components
although worn, may still have adequate service life and
could be used provided any burrs or sharp edges are
removed prior to reassembly.
Major refurbishing of the pump should be done in line
with reconditioning to an 'as new' status as replacing or
repairing one component may have an effect on other
components and the working clearances of the pump.
4.5
REASSEMBLY- PRELIMINARY
1.
Ensure all parts are clean before assembly.
Remove any burrs.
2.
Ensure free running fit of Outer Lockring in Race
Carrier and Race Carrier in Bracket.
3.
Fit Lip Seals to Outer Lockring and Race Carrier,
positioning sealing lip
towards
Bearing.
4.
If replacing Rotor Bearing:
a) Metallic: Press-fit, ensuring lubrication groove in
Bearing is in the 12 o'clock position. If the Bracket
has a greaser hole, align lubrication groove with
the greaser hole and drill through after fitting
Bearing.
b) Carbon: The recommended method of fitting
carbon Bearings is shrink-fitting. Press-fitting
carbon Bearings may cause damage to the
Bearing. Fit Bearing flush with spigot face,
ensuring lubrication groove in Bearing is in the 12
o’clock position. Machine or ream to achieve
correct clearance on Shaft ensuring squareness
and concentricity with locating spigot.
5.
If replacing Inner Rotor Bearing:
a) Metallic: Press-fit with Bearing flush with one
side of Inner Rotor.
b) Carbon: Shrink fit. (See 4b).
Machine or ream to achieve required clearance on
Inner Rotor Pin ensuring squareness and
concentricity with Inner Rotor O.D.
6.
Carry out preliminary sizing checks:
a) Axial length of Inner Rotor, Outer Rotor teeth
and Cover crescent must be matched to within
+/- 0,02mm.
b) Outer Rotor in Body diametral clearance. Note:
If checking by feeler gauge method, allowance
or compensation must be made for eccentricity
caused by:
i) Weight of Rotor.
ii) Clearances between Shaft and Bracket
Bearing.
iii) Lack of Bearing support at drive end
To measure clearance, insert feeler gauge at
two opposite measurement points 'X
1
'. Add the
two clearances together. This will give the
diametral clearance 'X' for the two points.
Repeat this procedure for the other two
measurement points 'X
2
'. Refer Figure 7
c) To check clearance between Inner Rotor and
Cover crescent, Inner Rotor should be held
firmly towards crescent. Refer Figure 6
Check clearance ‘V’
between end of tooth and
crescent using a feeler
gauge across the full width
of the tooth.
Figure 6
5
Summary of Contents for MD Series
Page 12: ...12 NOTES...
