To refit – Hale SMR-U User Manual

Page 20

To fit a new friction drive pulley, remove the pulley from the shaft as detailed above,
undo the four nuts, bolts and washers securing the pulley to the centre piece. Fit the
new pulley. Refitting of the pulley assembly is a reversal of the dismantling
instructions. Ensure that a new tab washer is always used on re-assembly.

To examine the non-return valve on top of the primer, undo the four bolts and
washers retaining the priming valve inlet to the valve body and cover. Examine the
seals, spring and diaphragm for wear, if necessary replace these parts.

To Refit
When refitting the water ring primer, rotate the primer hinge pin from its original
position so that the two grubscrews will bear on a different part of the shaft. Move the
whole primer forwards or backwards until both sides of the primer fibre wheel bear
equally on the sides of the driving pulley on the pump shaft. Tighten the grubscrews
and the associated locknuts. Reconnect the hoses to the relevant points and refit the
primer return spring.
When the primer is in position it is important to set a 3m gap between the bottom of
the lift-off pad attached to the primer and the lift-off rod which is used to lift the primer
away from the drive pulley. The gap is to make allowances for a new fibre drive
wheel to “bed-in” through initial wear, but still maintain sufficient distance to allow the
lift-off mechanism to work correctly. The lift-off pad can be turned to move it up or
down as required.

Primer hinge pin

Grubscrews to
secure primer to
hinge pin

Air outlet

Pulley on pump
shaft

Fibre drive wheel

Primer non-return
valve

3mm gap between
primer lift-off pad and
primer disengaging
lever

Primer return
spring

Piston primer blank cap

Primer disengaging
mechanism

Water inlet
connection