Disassembly And Reassembly - Pentair Pool Products SHURflo GMBN2VA Operating Instructions, Performance, Specifications And Parts Manual

SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
Bronze Models GMBN2VA, GMBN2VA3, GMBN2VA33, GMBN3VA, GMBN3VA4, GMBN3VA43, GMBN4VA,
GMBN4VA5, GMBN4VA53, GMBN5VB, GMBN5VB6, GMBN5VB63, GMBN6VC, GMBN6VC7, GMBN6VC73
Cast Iron Models GMCV2VA, GMCV2VA3, GMCV2VA33, GMCV3VA, GMCV3VA4, GMCN3VA43, GMCV4VA,
GMCV4VA5, GMCV4VA53, GMCN5VB, GMCV5VB6, GMCV5VB63, GMCV6VC, GMCV6VC7, GMCV6VC73
removed from the unit. Also remove
the internal o-ring (Ref. No. 10)
from the body.
REASSEMBLY
(Refer to Figure 12 for Reference
Numbers and Figures 10 & 11 for
detailed seal and shaft assemblies.)
1. Shaft/Seal Assembly
a. Install inside o-ring (Ref. No. 10)
into body (Ref. No. 4). Lubricate
with water on bronze models and
oil on cast iron models.
b. Refer to assembling components
on drive shaft (See Figure 10).
When installing the seal on the
shaft, wet with water and be
cautious when sliding it into
position. The spring retaining
washer and spring are behind
the seal with the carbon ceramic
facing towards the keyed end of
drive shaft.
c. There are two possible types of
seals. One style, the seal is one
piece while the other style has a
seal boot, spring and spring
retainer. The seal seats can also
be of two styles; one has a rubber
boot and the other has an o-ring.
Identify which type you have (See
Figure 11). Press seal seat into the
seal retainer (See Figures 10 & 11)
using water as a lubricant. The
white shiny ceramic face should
be visible after pressing the seal
to the seal retainer. It is recom-
mended to use a cardboard wash-
er or wood dowel when pushing
the seal seat into the seal seat
retainer. Any scratches, dirt, or
fingerprints on the carbon ceramic
faces will cause the seal to leak.
The seal seat is
stationary in the pump, while
the seal on the shaft rotates,
providing for the sealing surface.
d. Slide the seal retainer onto
the drive shaft holding seal
onto the shaft.
Form L-4087 (12/09)
e. Slide the drive shaft assembly
(Ref. Nos. 5,6,7,8 &19) into the
gear pump and secure with the
internal retaining ring (Ref. No.
28). (Also see Figure 10.)
f. As a last step, install o-ring (Ref.
No. 20) over the drive splines of
the drive shaft (Ref. No. 5).
2. Gear and Shaft Installation
a. Install external retainer ring (Ref.
No. 22) onto drive shaft assembly
(Ref. No. 5). Replace the woodruff
key (Ref. No. 24) into the drive
shaft (Ref. No. 5) using soft jaw
pliers, or protect the shaft with
rubber while pressing the key in
place. Be sure that the key is level
and that the key and shaft are
free of burrs and scratches.
b. The drive gear (Ref. No. 21) can
be dropped in place and must be
free to float on the shaft. Do not
force the drive gear onto the
shaft. Install external retainer ring
(Ref. No. 22) onto drive shaft
assembly (Ref. No. 5).
c. The idler gear (Ref. No. 21) is
placed on the idler shaft (Ref. No.
23) over the woodruff key and
secured by the two external
retaining rings (Ref. No. 22).
d. Slide idler gear and shaft assem-
bly into pump body (Ref. No. 4),
rotating gear to get gears to
mesh.
e. Ensure that the gasket surfaces
are clear of debris, and dry off
surfaces.
Place new, clean and dry gasket on
the pump body by sliding gasket
over dowel pins. For bronze mod-
els, refer to Appendix 1, to identify
the right thickness of gasket to use.
Any foreign or liquid
material on the gasket
or the gasket surfaces will increase the space
between the gears and the cover, and sub-
stantially reduce pump performance.
11
f. Slide cover over dowel pins. The
drive shaft assembly will require
slight compression as cover is
tightened. Replace and tighten
cover screws. Alternate from top
to bottom and side to side while
tightening screws. Torque cover
screws (See Appendix 1).
g. Reinstall pump to motor (See
Assembly on page 5).
3. All pumps must be primed before
start-up and the seal chamber needs
to be filled (See Figure 5).
PRESSURE RELIEF VALVE

DISASSEMBLY AND REASSEMBLY

1. Loosen lock nut (Ref. No. 37) on
regulator/relief valve adjustment
screw (Ref. No. 36) and rotate
clockwise (CW) 1-2 turns to free
regulator/relief valve spring retainer
(Ref. No. 34).
2. Unscrew and remove adjustment
screw (Ref. No. 36) by rotating
counterclockwise (CCW).
3. Unscrew valve end cap (Ref. No. 35)
by rotating counterclockwise (CCW).
4. Remove valve spring (Ref. No. 31)
and valve piston (Ref. No. 30), cover
and/or valve end cap.
5. Unscrew pipe plug (Ref. No. 36) by
rotating counterclockwise (CCW).
Inspection of relief valve components
should include piston for wear and
erosion, the spring and the o-rings for
degradation. Components should be
cleaned of accumulated build-up of
solid matter. The pressure relief valve
cover (Ref. No. 1) needs to be inspected
for wear on the piston pressure relief
valve seat (Ref. No. 29), the cover face
and the bushing pockets. Replace any
parts if worn.
To reassemble, reverse the disassembly
steps above.
6. All pumps must be primed before
start-up and the seal chamber needs
to be filled (See Figure 5).