The close coupled 1530 series design allows
adjustment of the impeller clearance between the
pump casing wall and the impeller face. The pump
impeller is adjusted at the factory during assembly
and should not require further adjustment upon
installation.
Impeller adjustment will be required when a drop
in head and/or capacity indicates a change in
clearances, or when existing components of the
pump are replaced. Refer to the following table for
recommended clearance when adjusting impeller
on horizontal pumps.
1) When existing components of the pump are
replaced with the exception of the casing, refer
to the assembly section of this manual for
proper impeller adjustment.
2) For impeller adjustment to compensate for
wear follow the procedure below.
A) Lock out the switch or circuit breaker in
the “OFF” position so that the motor can-
not be accidentally started.
B) Loosen set screws or other holding
devices if so provided on mechanical
seals before adjusting impeller to prevent
seal face damage.
C) Loosen bolts holding motor to base and
loosen casing bolts (Item 1D). Remove
fan guard.
D) Remove one shim (Item 67) from each
side of pump by pulling outward on the
extended tabs; this will decrease the
impeller front clearance by .010". Slowly
retighten casing bolts while turning and
pushing forward on the motor shaft to
be sure no binding occurs. If binding
occurs from the impeller rubbing the
casing, the shims that were removed
will have to be replaced
E) Continue this procedure until the impeller
10
13
Impeller Diameter
Clearance
Up to 8"
.015"
8" to 10"
.020"
10" to 13"
.025"
starts to contact the casing. At this point
replace the appropriate number of shims
to obtain the approximate impeller clear-
ance shown in the table above.
F)
Reset and tighten the mechanical seal
per the seal manufacturers instructions
and retighten the motor mounting bolts.
Replace fan guard.
WarNiNg: some motors haVe
eNd Float iN the shaFt. this
must be compeNsated For or
the axial loads deVeloped
WheN the pump is ruNNiNg Will
pull the impeller iNto the
casiNg, causiNg pump damage.
IMPELLER ADJUSTMENT
If the mechanical seal is a double inside seal,
remove the four bolts and washers (Item 17C,
17E) securing the gland (Item 17) to the cover
(Item 11) and remove the gland. Be sure the
set screws are loose, and pull the rotary seal
assembly off, using a twisting motion as it is
removed. The impeller (Item 2) can be
removed from the cover. Next remove the
stationary seal faces from the gland and
cover by gently pressing them out using your
thumbs. The carbon and ceramic elements
of the seal should be handled carefully to
prevent chipping or scratching.
8) The motor shaft adapter (Item 6) may be
removed from the motor shaft by removing the
Allen head screw (Item 6A). The drive key
(Item 46) will slide off with the shaft adapter.
In the bore of the shaft adapter there may be
some shims to take up the motor manufactur-
er’s shaft length tolerances. Be sure to note
the number and thickness of the shims used.
9) Remove pump adapter (Item 71) and motor
adapter (Item 71B) if provided.
assembly
1) Inspect casing, cover and impeller for any
damage and make sure all sealing surfaces
are free of dirt and scratches. If pump is
equipped with an internal seal flush, make
sure cover flush hole is clear. Check motor
end float. Excessive shaft end float (greater
than .015") can result in damage to pump
and or mechanical seal.
2) If equipped install the motor adapter (Item 71B).
Ensure that the adapter is seated squarely on
the motor before tightening adapter screws,
this may require some sanding of the paint on
the pilot diameters. Secure with adapter
screws (Item 71C), torque to 25 ft-lbs.
3) Install the pump adapter (Item 71). Ensure
that the adapter is seated squarely on the
motor adapter or motor before tightening
adapter screws, this may require some sand-
ing of the paint on the pilot diameters. Secure
with adapter screws (Item 71A), torque to
25 ft-lbs. end of shaft.
4) Place one .062" shim washer (Item 6B) in the
shaft (Item 6) bore. Install key (Item 46) into
the shaft key-way slot from the inside of the
shaft bore. Slide assembly onto motor shaft
and temporarily secure with shaft screw
(Item 6A).
5) Place six impeller adjusting shims (Item 67,
three on each side) and the cover (Item 11) on
to the pump adapter. Ensure that the cover is
seated squarely on the pump adapter, this may
require some sanding of the paint on the pilot
diameter. Clamp the cover tightly to the
adapter with clamps or bolts.
6) Thread the impeller (Item 2) onto the shaft
adapter until it bottoms on the shoulder of
the shaft adapter. Place a feeler gauge
between the cover and the balance vanes
on the impeller.
7) The gauge should read approximately .035", if
it does not, repeat steps 4-6 using a different
washer or combination of washers until the
proper clearance is obtained. Four washers
are supplied by Fybroc: 2@.010", 1@.032"
and 1@.062" this will provide for 0 -.110" worth
of shimming capabilities which will adapt to any
motor used.
8) Once the proper number of shims is deter-
mined, remove the impeller, cover and plastic
shims and tighten the shaft adapter screw to
35 ft-lbs. for 3/8" screws and 50 ft-lbs. for
1/2" screws.
9) Place some anti-seize lubricant on the shaft
adapter impeller threads.
10) The Fybroc pump, as standard, is equipped with
a single outside seal with stationary seal face
and rotating compression unit, or a double
inside seal with stationary seal faces and rotat-
ing double seal compression unit. The following
installation instructions are based on these seal
types. When other types of seals are used,
please refer to the manufacturer's installation
data. Determine the type of seal being used and
refer to the following sections.
siNgle outside seal iNstallatioN
JohN craNe type 8b2
1) Remove the mechanical seal from its packag-
ing, inspect for any damage, and keep seal
faces clean and free from contaminants
during installation.
do Not grease or
lubricate seal Faces.
