9
SHURflo Operating Instructions, Performance,
Specifications and Parts Manual
Models R30GN, R50GN and R102N
Form L-4095 (12/09)
g. Remove the woodruff key (Ref. No.
9), located on the side of the shaft
(Ref No. 12), by either of the follow-
ing two methods: place a screwdriv-
er on the woodruff key and tap
lightly on the woodruff key with a
mallet. Be careful not to damage
the woodruff key. If this does not
work, put the woodruff key in a soft
vise, tighten, then pull up on the
body (See Figure 4).
Do not damage the
shaft.
h. Using a large snap ring pliers,
remove the internal retaining ring
(Ref. No. 16) from the bearing hous-
ing (Ref. No. 14). Using a small snap
ring pliers, remove the retaining
ring (Ref. No. 17) from the shaft
(Ref. No. 18) at the seal end. While
supporting the bearing housing
(Ref. No. 14), press against the shaft
from the impeller end. The mechani-
cal seal (Ref. No. 10) will slide off
the shaft (See Figure 4).
i. Check the ball bearing (Ref. No. 15)
for leakage or damage. Discard the
bearing gasket (Ref. No. 13) and
replace with a new one (See Figure 4).
j. Inspect for leakage between the
shaft (Ref. No. 18) and pump body
(Ref. No. 12) at the drive end.
k. To remove the seat assembly (Ref.
No. 11), push a screwdriver through
the bearing end and against the
rubber or backside of the seal seat
(See Figure 4).
2a. Inspect drive shaft (Ref. No. 18). If
drive shaft has scratches where
mechanical seal (Ref. No. 10) is
installed or if key slots are worn,
replace shaft. If shaft is bent,
replace as well (See Figure 4).
b. Inspect the bushing (Ref. No. 3) in
cover (Ref. No. 4) for wear and/or
damage. If cover is worn (grooved
or distorted), replace.
c. The shaft should be installed into
the carbon bushing (Ref. No. 3) to
allow it to turn freely. It should not
be tight or fit loosely. If it does,
replace bushing.
3a. To replace the bushing (Ref. No. 3)
in the cover (Ref. No. 4), carefully
tap on a screwdriver with a mallet
to chip the old bushing from the
hole.
b. Push new bushing (Ref. No. 3) into
place, chamfer end first, until bush-
ing is flush against cover (Ref. No. 4).
Do not damage
the brass cover.
4a. Replace mechanical seal (Ref. Nos.
10 & 11) if removed, or is leaking
between the body and shaft while
the pump is running.
b. Remove the shaft (Ref. No. 18). See
above.
c. Push or pry out the old mechanical
seal seat (Ref. No. 11) by applying
incremental pressure with a screw-
driver from shaft bore at pump drive
end in bearing retainer (Ref. No. 14).
Do not damage seal bore in pump
body. Discard old mechanical seal
seat.
ASSEMBLY
1a. Before installing the cam (Ref. No. 8),
wipe off the old Permatex that has
built up on the cam and penetrated
the impeller cavity. Hold the cam in
place while installing and tightening
the screw (Ref. No. 6) that goes
between the intake and discharge
ports in pump body (Ref. No. 12).
b. Using a snap ring pliers, place the
retaining ring (Ref. No. 17) onto the
shaft (Ref. No. 18) and push down
into the second groove from the
drive shaft end. Push the ball bear-
ing (Ref. No. 15) over the shaft
(Ref. No. 18). Using a screwdriver,
carefully push the bearing up
against the retaining ring. Using a
snap ring pliers, place the second
retaining ring (Ref. No. 17) over the
shaft and against the ball bearing
(See Figure 4).
c. From the woodruff key end of the
shaft, push the seal seat (Ref. No.
11) over the shaft, rubber side first,
into the bearing housing (Ref. No.
14) (See Figure 4). Do not use any-
thing but water to lubricate the
seal seat.
Be careful not to
damage the white
ceramic surface on the seat (or the black
carbon face on seal). Damage could cause
leakage.
d. Push the bearing (Ref. No. 15) and
shaft assembly onto the bearing
housing (Ref. No. 14). Using uniform
pressure with a screwdriver, pop the
retaining ring (Ref. No. 16) into
place against the large internal
bearing (Ref. No. 15) (See Figure 4).
e. Push the mechanical seal (Ref. No.
10) over the shaft and down against
the seal seat (Ref. No. 11) (See
Figure 4). Do not use anything but
water to lubricate seal on shaft.
f. Using a snap ring pliers, place the
third retaining ring (Ref. No. 17)
on the shaft (Ref. No. 18).
Simultaneously compress the seal
assembly (Ref. No. 10) to allow the
Figure 4 - Drive Shaft Assembly
Seal Seat
Bearing
Retaining
Ring
Seal Assembly
Key
Small
Retaining
Ring
