SPP Pumps Auto Prime - High Flow Range XF300 & 400 - Manual (Page 15)

Operators Instructions for
XF300 & XF400 Range Centrifugal Pumps
Manual No/Rev
W77-009E / 2
Our policy is one of continuous improvement and we reserve the right to alter specifications at any time
Page 15 of 23
Fit the cover plate A100 and if removed,
insert oil level sight glasses A230, drain
plug A140 and overflow plug A180. Fill the
housing with bearing oil to the correct level.
e) Back Wear Plate Assembly
Clean the ‘O’ ring grooves lubricate and
place the ‘O’ ring D40 into the groove.
Apply lock-tight to the threads of the 1/4“
BSP stud pipes and fit into position.
If removed, insert the anti rotation roll pin
and tap into position in the static seal
housing
f) Seal assembly
Ensure that the static seal housing is clean,
place the back wear plate assembly in
position with the drain grooves vertical and
secure with nuts and washers D60 & D70.
Wipe the seal recess clean, lubricate the ‘O’
ring with a light smear of seal lubricating oil.
Taking care not to damage the sealing face,
line up the anti rotation pin with the groove,
and push into place, bolt on the seal
retaining plate E40.
Lubricate the inside of the rotating seal
assembly E10 and the shaft with soapy
water, DO NOT USE OIL OR GREASE.
Push the new rotating seal assembly E10
and retaining washer E30 down the shaft to
just past the retaining ring groove. Fit the
retaining ring E20 and pull the rotating seal
assembly and retaining washer back up
against the retaining ring.
Fit the oil level sight glass A230 and the
drain plug A180, fill the oil chamber with
mechanical seal lubricating oil and fit the
filler cap and vent pipe assembly A190 &
A200, A210 & A220.
g) Refitting the Impeller
Fit the impeller key F100 to the shaft F10
and slide the impeller C10 on to the shaft.
Ensure that it sits fully and squarely on the
taper on the shaft.
Fit the washer C20 and capscrew C30, lock
the shaft using the drive end keyway and
tighten the capscrew to 350 Nm.
Rotate the impeller and visually confirm that
it runs true, if not remove, clean all parts
and reassemble.
Fit the plastic cap C40 in the impeller
recess.
h) Refitting the Rotating Assembly
Replace any casing plugs removed during
dismantling.
Lubricate and install the ‘O’ ring D30 in its’
groove on the back wear plate D10.
If the suction cover B50 has been removed,
ensure that it has been fitted the correct
way round for clockwise impeller rotation
(looking on the pump drive end).
Fit shims A250 to give 3mm thickness (6 x
0.5mm) between the volute casing B10 and
the bearing housing A10 and fit the rotating
assembly in the volute casing, secure with
screws B30 lightly tightened.
Taking care to prevent pump rotation, reach
in through the suction port and using feeler
gauges in at least 6 positions, measure and
calculate the average clearance between
the impeller vanes and the suction cover
B50. Gap ‘M’ as shown on the section
drawing in Section 8.
Calculate the amount of shims A250 to be
removed to give a final average clearance
of between 0.38mm and 0.50mm (0.015”
and 0.020”).
Disassemble and reduce the shim pack to
give this clearance, reassemble and fully
tighten all screws uniformly.
Measure the clearance again and if
necessary repeat the procedure to ensure
the required clearance is achieved.
6.9 Hydrostatic Testing
After maintenance or repair involving strip
down of the pump, a hydrostatic test to a
maximum of 1.3 times the nominal pump
working pressure is recommended.