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Lubrication Interval in Operating Hours - STANDARD BALL BEARINGS only
HORIZONTALLY MOUNTED, AVERAGE MOTOR SPEED (RPM)
FRAME
1150
42
28,000
140
23,000
180
19,000
210
16,000
250
13,500
280
11,500
320
9,600
500
6,400
If a motor has no grease fittings, the bearings must be replaced.
MOUNTING BOLT TORQUES
Motors must be mounted on a solid, rigid base or foundation.
Poor base design can result in resonance in the motor/base
system that can result in bearing, motor feet, frame to foot
fasteners, or other, and motor damage.
All hold-down bolts must be of the correct grade for the type of
mounting, and for the method of coupling the motor to the load.
Some considerations are:
1.
Direct coupled or belt drives
2.
Motor feet orientation (horizontal, wall, or ceiling
mounting).
Bolts must be evenly torqued to their recommended value.
Recommended bolt torques for SAE grade foot bolts are given
below in foot-pounds. (All components are dry, i.e., not
lubricated):
Foot Bolt
Frame Hole
Size
Diam
& Third
42
.34
5/16-18
140
.34
5/16-18
180
.41
3/8-16
210
.41
3/8-16
250
.53
1/2-13
280
.53
1/2-13
320
.69
5/8-11
500
1.19
Motors with aluminum feet require a suitable heavy flat steel
washer between the foot and the mounting fasteners to spread
the bolt-clamping load out over a suitable area.
The above values are suitable for most applications. Heavily
© copy right 2012 by P O WE R TEC Industrial Motors, Inc
POW ERTEC "F" Series Motor Manual
1750
2500
3600
18,000
13,000
8,500
14,000
10,000
6,700
12,000
8,000
5,400
10,000
6,300
3,800
8,000
5,000
2,900
6,600
3,900
2,200
5,600
3,000
1,400
3,200
500
N/A
Steel
Steel
Size
Grade
Grade Socket
1
5
10
15
10
15
16
26
16
26
39
63
39
63
77
125
1-8
320
500
loaded systems and systems that are dynamic may require
careful study in choosing a suitable mounting system, grade of
bolt to be used, and hence the required bolt torques.
Head
25
25
42
42
100
100
200
820
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