SHURflo 316 Stainless Steel Rotary
Close-Coupled External Gear Pumps
12
SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
Viton Models GMSV2A, GMSV4A, GMSV6C, GMSV2A3T, GMSV2A33T,
GMSV4A5T, GMSV4A53T, GMSV6C7T and GMSV6C73T
Teflon
®
Models GMST2A, GMST4A, GMST6C, GMST2A3T, GMST2A33T,
GMST4A5T, GMST4A53T, GMST6C7T and GMST6C73T
Form L-4089 (2/17)
woodruff key (Ref. No. 8) by
gently tapping key with drift pin.
(Do not damage key or keyway
upon removal.)
3. From the drive shaft end of the gear
pump, remove the internal snap
ring (Ref. No. 13) from the body
(Ref. No. 12). The drive assembly,
which consists of the drive shaft
(Ref. No. 9), seal assembly (Ref. Nos.
18 & 19), seat retainer (Ref. No. 16),
bearing (Ref. No. 15) and retain-
ing rings (Ref. No. 14), can now be
removed from the unit (See Figure
8). Also remove the internal o-ring
(Ref. No. 20) from the body.
REASSEMBLY
(Refer to Figure 13 for Reference
Numbers and Figures 3, 8, 9, 10, 11 &
12 for detailed seal and shaft assem-
blies.)
1. Shaft/Seal Assembly
a. Install inside o-ring (Ref. No. 20)
into body (Ref. No. 11). Lubricate
with water.
b. There are two possible standard
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 10). (For the Teflon
®
seal, see the following note and
Figure 12.)
c. Refer to assembling components
on drive shaft (See Figure 9).
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 (See Figure 9).
d. Press seal seat into the seal
retainer (See Figure 11) using
water as a lubricant. The white
shiny ceramic face should be
visible after pressing the seal
into 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.
NOTE: When installing the seat for the
Teflon seal, an anti-rotation pin must be
installed into the seat retainer. The
anti-rotation pin (Ref. No. 25) is a small
spring pin which must be installed into
the seat retainer in the small hole.
About 1/8” to 3/16” of the pin should
be exposed inside of the seat retain-
er (Figure 11). The seal seat is then
installed into the seat retainer.
Figure 12 - Teflon Seal and Seat
“C” Clips (4)
Remove after set screws
are tight on shaft
Set screws (2)
