GRS-17000-E-01
850 SERIES
•
Install the impeller screw and impeller
washer
•
Install new O-ring to the bracket in
preparation for case assembly
•
Install the pump back-end into the case and
install and tighten case screws. Always
tighten screws in a sequence that resembles
a star-pattern
Wear Ring Replacement
Any stationary wear ring(s) are replaceable.
When rings are worn so that diametric clearance
between the impeller and the wear ring exceed
the values shown below, it is recommended to
replace the wear ring.
Note: the most significant impact to running a
pump with increased wear ring clearances in a
reduction in pump efficiency and a lesser
reduction in differential head.
Ring ID (in.)
Maximum
Recommended
Diametric
Clearance (in.)
From
To
(and including)
2
3
0.028
3
4
0.032
4
5
0.035
5
6
0.038
6
7
0.042
7
8
0.045
8
9
0.048
To replace a wear ring:
•
Disassemble the pump to gain access to the
wear ring (see previous instructions for
disassembly)
•
Remove the wear ring. If the back-side of
the wear ring is accessible, it might be
hammered out. Otherwise the wear ring may
need to be cut in one or more places to be
removed.
•
Clean the wear ring bore
•
Install the new ring by gently tapping with a
relatively soft hammer or block. Tap around
the circumference of the ring, ensuring that
the ring is being driven in squarely. Chilling
the ring in a freezer beforehand will aid in
installation
