Belt Drive; Checking Belt Tension; Belt Tension 5Vx Belts - Gardner Denver Electra-Screw EDEQHF Operating And Service Manual

SECTION 7
BELT DRIVE
Proper drive belt tension and alignment are provided at
the factory, however, good practice dictates checking
the drive alignment and tension after shipment and
before initial start-up. Sheaves should align straight
across the front with a straight edge. The best tension is
just enough tension to keep belts from "squealing" on
start-up.
CAUTION
Excessive belt tension can damage the
equipment. Tension the belts as shown
in Table 7-1.
Belts can be changed when necessary by first removing .
the
wire guard. ThEn loosen, but do not remove, the four
motor foot nuts. Next, use the adjusting screws in the
motor base to loosen belt tension. Remove the belts over
the fan.
CAUTION
Interference between the fan and the
orifice can damage equipment. Be cer-
tain the orifice has even clearance
around the fan before starting the unit.
CHECKING BELT TENSION - Using a spring scale,
apply a perpendicular force to each belt at the midpoint
of the span and measure the deflection. Correct deflec-
tion force and deflection are shown in Table 1-7. To
tighten belts, merely increase the center distance.
I
NOTICE
I
When a new set of belts is installed on
a drive, the initial deflection force
should be 1/3 greater than shown in
Table 7-1. Recheck tension frequently
during the first 24 hours of operation.
DEFLECTION FORCE (LBS)
I
+
DEFLECTION (INCHES)
----- _
I
-----
---
I
I
No.
Deflection
Deflection
Motor
of
Force Pounds
In
H.P.
Belts (per belt)
Inches
40
4
6-8.5
3/8
50
4
7-1o
3/8
TABLE 7-1 - BELT TENSION 5VX BELTS
13-8-610 Section 7 Page 1