GEH-5304A
8
B. Mounting
Motors and generators should be mounted on r igid and solid foundations. Level the base (or the machine).
Hold-down bolts should be inspected regularly and kept tight. The feet of the machine may be doweled to
the foundation plates or base when alignment procedures are completed. Sliding bases, when used, should
be securely anchored to the foundation .
Motors are mechan ically suitable for mounting with shaft horizontal or vertical on floor, ceiling or sidewall.
When sidewall or ceiling mounted, special provisions must be made to maintain the integrity of dripproof
enclosures.
When motor is sidewall or ceiling mounted, lifting points in addition to the
standard lifting lugs may be required. Lifting, in these cases should be done by
experienced riggers to avoid injury to personnel and damage to t he mot or.
C. Alignment
Be sure to align or check alignment carefully on either motors or motor genera-
tor sets. Misalignment can cause excessive vibration and damaging forces on
shafts and bearings.
Time taken to assure good alignment will be returned in reduced downtime.
1. Coupled Dr ive
When a motor is used to drive a unit, flexible couplings must be used to facilitate alignment. Three-
bear ing con struction r equires a ri gid coupling.
Careful alignment of machines when using either solid (rigid) or flexible cou-
plings is essential to prevent excessive vibration and bearing or shaft failures.
Before grouting the base, the coupling should be checked as follows:
1. Sl ide the s leeve fr om the coupl ing s o t hat t he hub faces are ex p osed .
2. Check that the coupling hub spacing is in accordance with the outline dimensions with
the units in the mechanical center of their end play.
3. Check parallel alignment by using a straightedge across the hubs at both vertical and
horizontal locations, or by clamping a dial indicator to one hub and indicating the oth er
hub on its outside diameter. Be sure that the dial indicator supports do not bend or sag,
since this will give inaccurate readings.
4. Use a dial in dicator at h ub faces and rotate both units together 90°, 180°, 270° an d 360°
or measure the gap at each position by inserting a feeler gage. The reading should not
vary more tha n 0.002” .
5. Correct any vertical misalignment by shimming between the base and the foundation.