Hale SMR-U - Manual (Page 9)

SECTION 3
LOW PRESSURE IMPELLER AND REAR WEAR RING
To Remove
In order to access the low pressure impeller, it is only necessary to disconnect
pipework as described in Section 1, then remove the 12 off M12 bolts from the volute
cover plate which may then be withdrawn together with suction tube etc giving direct
access to the low pressure impeller leaving the volute body in situ. Remove the
tacho sender and fit shaft locking screw (Tool No 60275/11) locating the spigot into
one of the drive flange holes. Remove the impeller nut and the pair of lock washers
and withdraw the impeller from the keyed pump shaft. It may be necessary to use
special tool 60275/04 to remove the impeller from the pump shaft.
Maintenance
Check the wearing diameter on the impeller in several places (see Fig 3-1). If the
diameter is less than stated in the table below, a new impeller should be fitted.
Fig 3-1
Checking the wearing diameters of the low pressure impeller
B
A
Pump Type Front Diameter (A) Rear Diameter (B)
WS2010 and
WS 3010 139.319 mm
5.485 in 135.33 mm
5.238 in
WS4010
169.67 mm
6.680 in 170.56 mm
6.715 in
©Godiva, Warwick
September 2000
wsmaint-Issue2 25-9-02 9