To remove, Priming systems continued water ring primer – Hale SMR-U User Manual

Page 19

PRIMING SYSTEMS Continued

WATER RING PRIMER

The Water Ring Primer is available as an alternative to the Piston Primer system. It
is mounted above the bearing housing and driven by a fibre wheel in contact with a
pulley at the end of the main pump shaft. Operation of the Water Ring Primer is fully
automatic, when the pump is started the primer is driven by the pulley wheel turning
the fibre wheel, air is evacuated from the pump allowing water to enter and build
water pressure inside the volute. The water pressure inside the pump is then used,
via the redundant piston primer housing, to act on a lever which pivots, and through
a second lever, lifts the Water Ring Primer clear of the drive pulley on the pump
shaft. When the primer disengages from the pulley it stops operating, if the pump
pressure falls e.g. when the pump is turned off, the primer fibre wheel will re-engage
with the pulley ready for priming operation when the pump is started again.

To Remove
To remove the entire Water Ring Primer unit, slacken the hose clip retaining the
3/4inch hose to the top of the primer. Disconnect the hose and secure the hose end
away from the primer. Disconnect and remove the primer return spring from the
lower part of the primer. If connected, remove the air outlet connection from the top
and the water inlet connection from the bottom of the primer. Slacken the two grub
screws securing the primer to the hinge pin. Carefully ease the primer unit off the
primer hinge pin.

Maintenance
To dismantle the primer for internal inspection, remove the 10 bolts and washers
securing the primer bearing housing to the primer body. Remove the primer bearing
housing complete with shaft, bearings, impeller and pulley. Examine the inner
diameter of the impeller and the corresponding surface of the suction and delivery
cover for excessive scoring, renewing these parts if necessary.

To fit a new suction and delivery cover, remove the self-locking screws which secure
the cover plate to the suction and delivery cover. Fit this cover plate to the new part,
noting that no gasket is used but jointing compound should be used on the
contacting faces.

To fit a new impeller, undo the impeller retaining screw and pull off the impeller.
Note: if the impeller binds on the shaft it will be necessary to remove the primer shaft
as follows -
At the pulley end of the shaft, knock back the tabwasher and remove the nut
securing the pulley to the shaft. Remove the pulley and extract the woodruff key and
the circlip. Tap out the shaft from the impeller end. The shaft will bring the bearing
with it and these can now be replaced if necessary. The shaft seal will remain in
position and if this requires renewing it should be drifted out, together with its
backing washer, towards the impeller end. When fitting a new seal ensure that the
lip on the backing washer and the open end of the seal face is towards the impeller.