BJM Pumps KZE550-575 - Manual (Page 16)

15
CHANGING MECHANICAL SEALS*
1)
Follow instructions 1 through 4 in the “Changing Mechanical Seal Cooling Oil”
section of this manual
2) With the pump properly supported on its side, begin to remove the following
components:
a. Strainer/ stand
b. Wear plate
c. Agitator (note this will need to be heated to 400°F break the
bond of the thread locking compound)
d. Impeller
e. Volute case
f. Seal chamber cover
3) Once the seal chamber cover has been removed, carefully remove the old
mechanical seals. Clean the chamber to remove all old oil, water and any
debris that may be present.
4) Inspect the shaft to insure that no damage has occurred and that a slightly
rough micro finish of approximately 100 rms is present. Use 220 wet and dry
sand paper to scuff the shaft axially to gain the proper finish.
5) Lubricate the new upper stationary mechanical seal with the new seal
chamber oil,, and push into position with a non marring pushing tool (clean
PVC pipe works well).
6) Repeat the previous step for the lower stationary mechanical seal located in
the seal cover.
7) Lubricate the shaft with seal chamber oil. Place the upper rotating seal face
onto the shaft and push with a seal pushing tool that pushes on the bellows.
Push into place until the rotating face is in contact with the stationary face.
8) Place the spring into position on the upper rotating seal.
9) Lubricate the shaft with seal chamber oil. Place the lower rotating seal face
on the shaft facing outward. Push with a seal pushing tool that pushes on the
outer edge of the seal without contacting the face. Push down until the lower
rotating face is at the approximate locating.
10) Check the O-ring on the seal cover and replace if necessary.
11) Carefully replace the seal cover by slowly pushing down on the rotating seal
assembly until the seal cover is fully in position.
12) Replace the seal cover retaining fasteners and torque to the proper
specification.
13) Rebuild the pump in the opposite manner it was disassembled. Properly
torque all fasteners.
*Note: If there is excessive liquid found in the oil or mechanical seal damaged, please
contact BJM Pumps authorized service centers.