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9.
BEARING REMOVAL AND INSTALLATION
BEARING REMOVAL
Pump bearings are available in bronze, iron, carbon, and glass/graphite impregnated PTFE. Any of these
bearings may be removed using a Snap-On tool puller, part number CG45. This tool may be purchased through
your local tool dealer or through Roper Pump Company. If you do not have this bearing puller, any of the bearings
may be removed by using a hacksaw blade to cut through the bearing in two places 180 apart. This procedure
will usually loosen the bearing enough to be pulled out. If this procedure is used, take care to prevent damage to
the bore into which the bearing is pressed.
Carbon bearings may also be removed by carefully chipping the bearing out with a chisel. Take care not to scar
the endplate bores during the bearing removal process.
After removing the bearings, always check the endplate bores for nicks and burrs caused by the removal process.
The bores must be clean, smooth, and free of burrs before attempting to install new bearings.
BEARING INSTALLATION
1. Remove all burrs and raised edges from bores for bearings.
2. Place faceplate or backplate on a press base with milled face upward. Support endplate so that milled
face is perpendicular (square) with press ram.
3. Position endplate so that one bearing bore is located directly under press ram.
4. A.) If iron or bronze bearings are to be installed, lubricate endplate bores with a light oil that is compatible
with product to be pumped.
B.) If carbon bearings are to be installed, lubricate bearings by submerging them in cold water prior to
installation.
C.) If glass/graphite filled PTFE bearings are to be installed, no lubricant should be used.
5. Place end of new bearing at entrance of bore in endplate, taking care to align grooves in bearing with the
grooves in face of endplate.
6. Press bearing into endplate bore. When carbon bearings are being installed, it is important to press them
in with one slow uninterrupted stroke to prevent cracking. It is best to use a stepped arbor with a few
thousandths of an inch clearance between arbor and bore of bearing. Be sure to press bearings in until
they are flush to .005 of an inch [.127 mm] below milled face of endplate.
7. Repeat procedure for second bearing.
8. Using a three square file, file shallow grooves in ends of bearings to connect grooves inside bearings with
groove on milled face of endplate. If your bearings or endplates do not have grooves, omit this step.
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