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Use Table 5 as a general guide for regreasing and
bearings. A small amount of grease at frequent intervals is
preferable to a large amount of grease at infrequent
intervals. For special applications involving high speeds or
high temperatures Consult DODGE.
TABLE 4 – VISCOSITY OF OIL IN THE GREASE
DN
∆
Viscosity for Loads
Up to 18% of
Dynamic Capacity
(SUS @
Operating Temp.)
DN
∆
Viscosty for Loads
Up to 18% of
Dynamic Capacity
(SUS @
Operating Temp.)
2,500 3500 35,000 625
5,000 3150 40,000 525
7,500 2750 45,000 450
10,000 2375 50,000 400
12,500 2000 75,000 300
15,000 1750 100,000 200
17,500 1500 125,000 150
20,000 1300 150,000 130
22,500 1075 175,000 110
25,000 900 200,000 100
DN = Bore Diameter (MM) × RPM
* = For loads above 18% of dynamic capacity an EP grease
with the above viscosity oil is recommended.
TABLE 5 – REGREASING INTERVALS (MONTHS)*
(Based on 12 Hours Per Day 150°F Max.)
RPM*
Size, MM 250 500 750 1000 1250 1500 2000 2500 3000 3500
40–60 8 6 4 3 2 1 .5 .5 .25 .25
65 7 5 3 2 1 1 .5 .25 .25
70–85 6 4 3 2 1 .5 .5 .25
90–100 5 3 2 1 .5 .5 .25
110–130 4 3 2 1 .5 .25
140–160 3 2 1 .5 .25
170–190 2 1 .5 .25
200–220 1 5 .25
*FOR OTHER SPEEDS CONSULT DODGE ENGINEERING
LONG–TERM STORAGE OF
PRE-ASSEMBLED BEARINGS
Applications such as conveyor pulleys and fans are
shipped to a job site with bearings already mounted to the
shafts. Since these units may be stored for long periods of
time in unprotected areas subject to rain, dust, etc.
bearings should be packed 100% full of grease and so
tagged at bearing assembly to prevent contamination or
corrosion of the bearings.
Prior to installation on the structure, if the application
RPM is greater than 20% of catalog maximum speed,
excess grease must be removed to the levels outlined
previously. Removal of excess grease must be done in a
clean, protected environment.
TABLE 6
MAXIMUM RPM (DIRECT MOUNT)
Max. RPM
Shaft
Size, MM
Basic
Bearing
Description
Grease Oil
75 22215 3400 4300
80 22216 3200 4000
85 22217 3000 3800
90 22218 2600 3400
100 22220 2200 3000
110 22222 2000 2800
120 22224 1800 2400
130 22226 1700 2200
140 22228 1600 2000
150 22230 1500 1900
160 22232 1400 1800
170 22234 1300 1700
180 22236 1200 1600
190 22238 950 1300
200 22240 900 1200
220 22244 800 1000
OIL LUBRICATION
USAF bearings are specifically designed to handle
both grease and oil lubrication. Oil lubrication is normally
required at high speeds as well as high loads or whenever
heat from an external source is flowing into the bearing.
Oil lubrication may be static or circulating. With static oil,
fill the bearing cavity with oil up to the centerline of the
lower roller. The dimension is identified as "w" and is
shown on Table 8. Mount an oil sight gauge on one of the
drilled and tapped drain holes on the side of the pillow
block for visual indication of this level. The oil level may
drop or rise during operation depending on the rotation of
the bearing. Oil should only be added when the bearing is
not operating. Both the static oil level and the running oil
level should be marked on the oil sight gauge and properly
identified.
For circulating oil, the flow rate, and size of return
drains are shown on Table 8.
5