GE GEH-5304A User Manual
Page 18
GEH-5304A
18
Table 7
Bolt Tightening Torque Values
Hex Head (C1C5) Grade 5
Medium Carbon Steel
Thread Sizes
(Without Lubricant)
(UNC-2A)
Lb-Ft
N-m
1/4-20
7-9
10-12
5/16-18
13-17
18-23
3/8-16
24-30
33-40
1/2-13
60-75
80-100
5/8-11
120-150
160-200
3/4-10
210-260
280-350
For lubricated bolts, use 65% of value shown in Table 7.
L.
Accessory Mounting
Provisions for mounting accessories on the commutator endshield is a standard feature. The rabbet has
NEMA type C-Face mounting dimensions, including the mounting bolt holes. The standard stub shaft also
permits coupling certain accessories.
To prevent injury from the rotating shaft, the stub shaft cover must be main-
tained in position when the accessory mounting is not used.
Standard accessories are available as kits. These include a variety of tachometers, speed limit switches and
brakes. A mounting adapter, which can be machined for various accessories, can be ordered separately.
M.
Brakes
Flange mounted brakes may be mounted on the accessory rabbet. Since the accessory stub shaft is not suit-
able for use with a brake, the standard NEMA commutator end shaft extension should be ordered when such
use is planned. Standard brakes are designed for horizontal floor mounting only. When motors are sidewall
or ceiling mounted, the brake must be reassembled to maintain its relation to the horizontal. Where motors
are to be mounted with the shaft greater than 15
°
from the horizontal, special brakes should be specified.
Improper selection or installation of a brake and/or lack of maintenance may
cause brake failure, which can result in damage to property and/or injury to
personnel. (Refer to the separate instruction book pertaining to the brake fur-
nished.)
N.
Inspection After Starting
The following items should be checked after the machine is running:
1.
Bearings
Ball bearing or roller bearing housing temperature should be no more than 80
°
C (176
°
F). Excessive
bearing temperature may be caused by misalignment or improper greasing (Refer to Alignment and
Bearing Maintenance sections.)