Zenith BB-PEP Series, Original Installation, Care And Maintenance, Page: 12 / 16

11
N. REASSEMBLY OF PUMP
CAUTION ATTENTION
READ THIS ENTIRE PROCEDURE BEFORE ASSEMBLING PUMP
NOTE: Inspect all running surfaces for scratching, scoring and wear prior to assembly of pump. Minor scratching is
acceptable. If parts are heavily scratched or scored, they should be replaced. Thoroughly clean all pump
components.
WARNING
Follow the supplier’s recommendations when using cleaning fluids.
NOTE: Zenith Pumps recommends replacement of all “o” rings and seals every time these parts are disturbed from
their original installed position.
NOTE: Refer to “Inspection of Parts” for additional information on part inspection and replacement. Wipe all parts
with light lubricating oil to assist in assembly.
NOTE: Prior to assembly, remove all nicks and sharp edges on housings and gears with de-burring stone. Avoid
excessive breaking of edges at outside diameter of gears as this could negatively affect flow rate.
1. Refer to the exploded view in section M of this manual. Install the front cover plate in a vice, oriented so that the
three seal housing bolt holes are facing upward.
2. Install the lip seal in the seal housing by pressing it in firmly with your fingers. (Install packing seals in the seal
housing for a packing seal version).
3. Install the lip seal housing on the Rheo seal ensuring that the lip seal flange contacts the Rheo seal face.
4. Install the seal assembly so that the Rheo seal or packing housing passes through the front cover plate and the
seal flange contacts the front plate.
5. Lubricate the seal housing bolt threads and under the bolt heads with high-temperature thread lubricant. Insert
the seal or packing housing bolts and tighten the four binder screws in four stages in a crossing pattern until full
bolting torque is reached. See table below for proper bolt torque loading. (If using a packing seal, install the
packing gland and finger tighten the screws.)
6. Reposition the front cover plate in the vice so that the seal assembly is on the bottom with the shaft bore
oriented vertically.
7. Grasp a B-bearing and install the shaft, drive-end first, through the larger B-bearing bore. The “Zenith” logo
etching on the B-bearing should be clearly visible with the gear resting against the opposite face of the B-
bearing.
8. Insert the smaller diameter end of the arbor into the smaller B-bearing bore. Align the shaft and arbor gears with
meshed teeth so that both gear faces rest against the face of the B-bearing and the “Zenith” logo etching on the
B-bearing is clearly visible on the opposite face.
9. Install the second B-bearing so that both the shaft and arbor pass through the associated B-bearing bores and
the “Zenith” logo etching is clearly visible on the exposed face of the B-bearing.
CAUTION ATTENTION
Make certain that there are no contaminants on the surfaces of the gears, B-bearings or cover
plates. A minute piece of debris will cause the pump to bind.