Gorman-Rupp Pumps 88A2-F6L 1341412 and up - Manual (Page 29)

80 SERIES OM−02720
MAINTENANCE & REPAIR PAGE E − 10
Clean the intermediate, shaft and all component
parts (except the bearings) with a soft cloth soaked
in cleaning solvent. Inspect the parts for wear or
damage and replace as necessary.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Clean the bearings thoroughly in fresh cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. Failure to do so will great-
ly shorten bearing life. Do not spin dry
bearings. This may scratch the rollers or
races, and cause premature bearing fail-
ure.
Rotate the bearings by hand to check for rough-
ness or binding and inspect the bearing rollers. If
rotation is rough or the rollers are discolored, re-
place the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the bearing
housing. Replace the bearing cups or cones, the
shaft, or intermediate if the proper bearing fit is not
achieved.
If bearing replacement is required, use a bearing
puller to remove the inboard and outboard bearing
cones (28 and 31) from the shaft.
Shaft and Bearing Reassembly and Installation
(Figure 2)
Clean the intermediate, shaft and all component
parts (except the bearings) with a soft cloth soaked
in cleaning solvent. Inspect the parts for wear or
damage and replace as necessary.
Most cleaning solvents are toxic and
flammable. Use them only in a well ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Inspect the shaft for distortion, nicks or scratches,
or for thread damage on the impeller end. Dress
small nicks and burrs with a fine file or emery cloth.
Replace the shaft if defective.
Pre-pack the bearings by hand (or use a bearing
packer if available) with No. 0 lithium base grease
until the bearing rollers are thoroughly lubricated.
Position the inboard and outboard bearing cones
(28 and 31) on the impeller shaft (23) with the high
side of the tapered roller bearings toward the lubri-
cation cavity. Press the cones onto the shaft until
seated squarely against the shaft shoulders.
When installing the bearings onto the
shaft, never press or hit against the rollers
or roll cage. Press only on the inner race.
Press the bearing closure (32) and inboard bearing
cup (30) into the intermediate until seated squarely
against the intermediate shoulder.
When installing the shaft and bearings into
the bearing bore, push against the outer
race. Never hit the rollers or roll cage.
Slide the shaft and assembled bearing cones into
the intermediate bore from the drive end until the
inboard bearing cone (31) fully engages the in-
board bearing cup. Press the outboard bearing
cup (27) over the outboard bearing cone (28).
Install the same thickness of bearing adjusting
shims (21) as previously removed and secure
them with the bearing cap (26) and hardware (24
and 25).