Assembly And Disassembly
Single-Flushed Shaft Seal
Replacement Of Primary Shaft Seal
Note:
Lubricate all O-rings with food grade sili- 8.
cone grease or oil before assembly.
Unscrew the stationary seal ring (8) in the
back plate (left hand thread) using the
spanner delivered with the pump.
1.
2.
3.
4.
5.
6.
7.
15
Mineral oil or grease will damage EPDM
rubber.
Nitrile should be specified when Petrola
tum based lubricants are used on
O-rings
Remove wing nuts
(20)
and dismount
casing.
Remove safety shield.
Remove impeller retaining nut (33), if sup
plied with pump.
Hold stub shaft and knock gently on impel
ler vanes counter clockwise with plastic
hammerto loosen impeller. Remove impel
ler.
Remove nuts (16) and washers (17) in a
dapter (3) and pull off back plate.
Remove rotating seal, O-ring, and spring.
Fit O-ring (12) inside the new rotating seal
ring (11 ). Replace rotating seal ring. Make
sure that the driver in the driving ring is di
rectly opposite the notch in the seal ring
and check that the spring (10) is correctly
positioned.
9.
Fit O-ring
(9)
on the new stationary seal
ring (8) and screw it into back plate.
1 O. Carefully push back plate with seal housing
and stationary seal ring over the shaft with
seal parts.
Note:
Be very careful that the driver on the
driving ring enters the notch in the rota
ting seal ring.
11. Fit back plate (21) on adapter (13).
Secure with washers (17) and nuts (16)
and tighten.
12. Screw impeller (33) onto stub shaft. Fit im-
peller retaining bolt, if used. Remember
to install O-ring into O-ring groove on face
of impeller.
13. Fit O-ring
(22)
on back plate.
14. Fit pump casing (25) on back plate and
tighten wing nuts
(20)
finger tight so that
there is metal-to-metal contact between
casing and back plate.
15. Fit and tighten tubes (37).
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