Ebsray E Series, Installation, Operation & Maintenance Instructions Manual

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10. Remove internal circlip.
11.
Remove pump end bearing.
12.
Remove adaptor plate complete with
stationary seal face and 'O' Rings from
body.
13. Remove mechanical seal rotary
assembly by unlocking two grubscrews
and withdrawing from shaft.
14.
Release pressure on bypass spring by
releasing locknut and rotating
adjusting screw anti-clockwise.
15.
Remove bypass valve adjusting cover
assembly complete with retaining
washer and bypass spring.
16.
Remove bypass valve blanking cover.
17.
Unlock bypass valve seat locknut.
18.
Withdraw bypass valve seat complete
with bypass valve.
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.
It is recommended that all 'O' Rings and oil
selas be replaced when pump has been
disassembled.
Check mechanical seal faces for wear or
damage.
Major refurbishing of the pump should be
done in line with reconditioning to an 'as new'
status as replacing or repairing one
component will have an effect on other
components and the working clearances of
the pump.
4.5 REASSEMBLY- PRELIMINARY
For dimensions & clearances, refer to
table of clearances and figure 6.
1. Ensure all parts are clean before
assembly. Remove any burrs.
2.
If replacing inner rotor pin:
Press in until home ensuring
squareness to cover.
3. If replacing inner rotor bearing:
Press in. Machine or ream to achieve
required clearance on inner rotor pin
ensuring squareness and concentricity
with inner rotor O.D.
4.
Carry out preliminary sizing checks:
a) Outer rotor in body radial clearance
Note: If checking by feeler gauge
method allowance or compensation
must be made for eccentricity caused
by:
1) Weight of rotor.
2) Clearances in shaft bearings.
3) Lack of support at drive end.
To measure clearance insert feeler
gauge at two opposite measurement
points 'X' and 'X'. Add the two
clearances together and divide by 2.
This will give the radial clearance 'X'.
b) Inner rotor width, outer rotor tooth
depth and cover crescent length must
be a matched dimension.
c) Clearance between inner rotor and
cover crescent remembering to make
allowance for inner rotor pin to bearing
clearance.
5. Ensure all suction/pressure circulation
tube assemblies are clear of any
obstructions.
6. EBSRAY recommend replacement of
all gaskets, seals and 'O' Rings at
every overhaul, to ensure positive
sealing.