Goulds Pumps 3409 - IOM - Manual (Page 49)

ADJUSTABLE WEAR RINGS
Adjustable rings are an assembly of two threaded rings
(Fig. 29). The outer, stationary ring is held in the casing by
a flange and an anti-rotation pin in the lower half main
joint. The inner, adjustable ring can be moved axially, in
either direction, by rotating it. The ring is held in position
by a stainless steel locking pin. All rings have clockwise
threads.
Adjustment
When the clearance between the impeller wear face and the
adjustable wear ring becomes excessive; i.e., approximately
.020" to .030", remove the upper half casing and pull the
locking pin.
Rotate the inner rings clockwise to restore .005" - .008"
clearance greater than shaft end float between the ring and
the impeller. Drill a new hole in the inner ring for the
locking pin. This is a blind hole — do not drill through.
Replace the locking pin and upper half casing.
Disassembly and Reassembly
Adjustable rings are removed in the same manner as
standard casing rings. They can be separated for cleaning.
Adjustable rings are installed in the pump with stationary
and the adjustable members assembled but not pinned. Turn
the adjustable member counterclockwise to provide
maximum impeller clearance and slide over shaft ends.
With the rotating element in pump, the rings can be
adjusted. Be sure that stationary member has its flange
flush against casing lower half.
Move rotating element toward outboard end as far as
bearings permit. Screw outboard end adjustable ring
toward impeller to obtain .005" - .008" axial impeller
clearance. Drill through stationary ring hole into adjustable
ring and insert locking pin. Move rotating element toward
coupling and set coupling end ring in the same manner.
3409 IOM 11/04
49
LOCKING
PINS
CASING
(100)
IMPELLER
(101)
(126)
SLEEVE
(127)
STATIONARY
RING
(127)
ADJUSTABLE
RING
Fig. 29
6