Hale SMR - Manual (Page 18)

Supplement for World Series Pump Maintenance – WT and WS Models
Mk 3 Piston Primer (One piece piston) fitted to -
WT Models from Serial number 2000
WS Models from Serial number 9000
Disassembly/Assembly instructions for the piston assembly, part number 56960/06.
1. The piston assembly fitted to these models is a one-piece unit which is held in position by the
return spring. A spring retainer and a pair of split collets retain the spring against the end of
the piston rod.
2. To release the piston from the cylinder it is necessary to depress the spring retainer and the
spring below, but not the piston rod, this will then release the pair of split collets securing the
spring retainer.
A special tool is available from Hale Products Europe to assist with this procedure.
Spring retainer
Split collets
Spring
One-piece piston
Press on the spring retainer to release the split collets and the
spring below. When the spring is removed the piston can be
pushed from the cylinder
Reassembly of the piston to the cylinder is a reversal of the disassembly procedure.
Maintenance of the piston rod seal components is the same for both types of the piston primer.
©Godiva, Warwick
September 2000
wsmaint-Issue2 25-9-02 18