Page 14
Impeller Replacement
Maintenance
PUMP DISASSEMBLY
AND IMPELLER REMOVAL
• Remove pump casing.
• Remove O-ring and discard.
• Remove impeller locking capscrew, lockwasher,
impeller washer O-ring and discard.
• Unscrew threaded impeller.
NOTE: Pumps with clockwise rotation as viewed from
the shaft (driver) end have a right-hand threaded
impeller. Pumps with counterclockwise rotation as
viewed from the shaft (driver) end have a left-hand
threaded impeller. The impeller cap screw is always
right-hand thread.
• Check the clearance between the impeller inlet wear
ring and casing wear ring. If it is more than .020”
(0.5mm) on a side, replace the casing wear ring.
• Check the clearance between the impeller hub wear
ring and seal plate wear ring. If it is more than .020”
(0.5 mm) on a side, replace the seal plate wear ring.
IMPELLER INSTALLATION
• If removed, reinstall seal plate into the bracket.
• Install new impeller by threading onto the shaft until it
seats solidly against the shaft shoulder, then secure
using a new impeller washer, lock washer and
capscrew with Loctite
®
Threadlocker Red 271™ or
equal. Torque to 50 ft-lb (68 Nm).
• Reinstall casing using a new O-ring. Apply Loctite
®
Threadlocker Red 271™ or equal to the casing
capscrews. Torque to 100 ft-lb (135 Nm).
• Rotate pump to insure free rotation.
FIGURE 5
Shaft Seal
Shaft
Casing
w/ Wear Ring
Frame
Mount
Bracket
Seal Plate
w/ Wear Ring
Impeller
Casing
O-Ring
O-Ring
Shaft Sleeve
External
Retaining
Ring
6583 0712