Assembly And Disassembly
Replacement Of Single 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) with the tool
delivered with the pump.
1.
2.
3.
4.
5.
6.
7.
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 (32), if sup
plied with pump.
Hold stub shaft with one hand and knock
gently on impeller vanes with plastic ham
mer counter clockwise to loosen impeller.
Remove impeller (33).
Remove nuts (16) and washers on adapter
(13) and pull off back plate.
Remove rotating seal, O-ring, and spring.
Fit O-ring (15) inside the new rotating seal
ring (17). 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 (18) is correctly
positioned.
9. Fit O-ring (9) on the new stationary seal
ring (8) and screw it into back plate.
10.
Carefully push back plate (21) with statio
nary seal ring over the shaft on which other
seal parts are already mounted. Fit wash
ers (17) and nuts (16) and tighten.
Note:
Be very careful that the driver on the
driving ring enters the notch in the rota
. ting seal ring.
11.
Screw impeller (33) onto stub shaft. Fit im
peller retaining bolt (32), if used. Remem
ber to install O-ring (34) into O-ring groove
on face of impeller.
12. Fit O-ring (22) on back plate.
13. 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.
14. Install safety shield over adaptor and se
cure using thumb screw.
12
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