7
Figure 2 Figure 3
Elastomer Bellows Mechanical Seal Metal Bellows Mechanical Seal
5. Remove ball bearing (11) from power rotor (7) by first removing retaining ring (15) from groove in power rotor (7)
shaft. Ball bearing (11) can then be removed with a gear puller or arbor press.
CAUTION
Removal of bearing by force applied to its outer ring could damage bearing.
NOTE:
Imo Pump strongly recommends replacing ball bearing every time it is removed from power rotor.
6. Remove inlet head (2) after first removing four bolts (3 or 6) from inlet head (2).
7. Remove O-ring (26 or 31, depending on pump size) from inlet head (2).
H.4 – PUMP ASSEMBLY / REASSEMBLY
NOTE:
Prior to pump assembly, all parts should be cleaned and inspected for nicks, burrs or gouges. When
ready for assembly, wipe all parts, including bolts, O-rings and seal faces with a clean, lubricating oil
or pumped product, if applicable.
CAUTION
Bearing service life could be significantly reduced if pushed onto shaft by outer ring.
1. Install ball bearing
(11)
onto shaft (7) using an arbor press and sleeve by pushing on ball bearing (11) inner ring
only
until ball bearing (11) is positioned against shoulder on power rotor (7).
2. Install retaining ring (15) in groove into power rotor (7).
3. Before installing seal (16), insure power rotor (7) shaft is clean and has no burrs or sharp edges.
CAUTION
To avoid seal leaks, avoid contacting sealing faces of mechanical seal with any objects, including fingers.
Objects can scratch sealing surfaces. Acids in finger oils can etch them.
4. Mechanical Seal (16) Installation – See Figures 2 and 3 above.
Clean and Lubricate Sealing Face – Clean sealing faces of rotating assembly and stationary seat with alcohol and
lint free cloth. Apply light film of clean lubricating oil to both sealing faces.
ROTATING ASSEMBLY
Seals with Elastomer (rubber-like) Bellows – Apply light film of oil to elastomer bore of rotating assembly and
push it onto power rotor (7) shaft with twisting motion. Do not allow fingers to touch sealing face.
Seals with Metal Bellows – Apply light film of clean lubricating oil to O-ring in rotating assembly bore and push
onto power rotor shaft (7) with a rotating motion. For size 20 only, make sure slots in rotating assembly line up
with seal return hole in power rotor shaft (7). Tighten seal setscrew(s).
