1900 Series Horizontal Splitcase Pumps
Instruction and Repair Manual
27
11/12/18
wearing rings and impeller. The opposite surface of the
impeller should be protected from damage throughout the
procedures by resting it against soft wood on the surface of
work bench.
CAUTION:
Impeller wearing rings must be given special care because they
are press fit. Be sure rings are positioned squarely over hubs
of impeller. A soft headed hammer may be used to gently tap
impeller wearing rings into correct alignment before they are
pressed into place.
4. On right-hand unit proceed to assemble the rotating element
as follows:
Coat impeller (B1) keyway with Loctite
®
sealant grade 242 and slide impeller (A1) onto shaft (4).
Place gasket (39B) on shaft and slide separate sleeve (48) against it. Place casing bushings (39) over separator
sleeve. Place gasket (39A) on shaft, coat impeller (B1) keyway with Loctite
®
sealant grade 242 and slide impeller (B1)
in place. Key (102) should not protrude beyond impeller (B1) hub after impeller has been positioned. Place O-ring (14A)
in shaft sleeve (A14), then thread shaft sleeve tight onto shaft (4).
On left-hand unit use same procedure, only starting with impeller (B1).
NOTE:
When assembling rotating element of a 1900 Series pump it is important that the curve of impeller blades is in
agreement with pump rotation. (See insert in Figures 6, 7, or 8.)
CAUTION:
Carefully check to see that the proper shaft sleeve has been keyed into place for rotation of pump. If the correct shaft
sleeve is not keyed onto shaft, it can spin loose during operation of pump and cause extensive damage.
5. Install packing or mechanical seals and secure according to the following specific instructions:
STANDARD PACKING:
a. Slide bushings (20) onto each end of shaft. The raised shoulder on bushings must face away from impeller.
b. Seven pieces of packing (212) are placed on outboard end of shaft (4) over shaft sleeve. Two pieces of packing,
a lantern ring (10), and three more pieces of packing are
placed on inboard shaft sleeve.
Stagger breaks in packing rings so that pump will not leak
excessively.
MECHANICAL SEAL:
a. Single seal and balanced single seals.
I. Slide one seal lock collar (456B) with setscrews (456C)
facing the impeller onto each end of the shaft. Position
on scribe mark made during disassembly and lock in place.
F. Bearing cartridge cap and gasket removed from shaft.
G. Inboard and outboard bearings and bearing cartridges removed.
