Gardner Denver Reavell 5236, Operating & Maintenance Manual

Page: 101 / 134

APP 011 BELT DRIVE
Page 3
TABLE
Belt
Section
Force required to deflect belt 16 mm per metre of span
Basic setting force New Belt setting force
Small Pulley
Ø mm
Newton
(N)
Kilogram
force
(kgf)
Newton
(N)
Kilogram
force
(kgf)
SPZ
XPZ & QXPZ
58 to 71 16 1.6 20 2.0
75 to 90 18 1.8 22 2.2
95 to 125 20 2.0 25 2.5
Over 125 22 2.2 28 2.8
SPA HSPA
XPA & QXPA
80 to 100 22 2.2 28 2.8
106 to 140 30 3.0 38 3.9
150 to 200 36 3.7 45 4.6
Over 200 40 4.0 50 5.1
SPB HSPB
XPB & QXPB
112 to 160 40 4.0 50 5.1
170 to 224 50 5.1 62 6.3
236 to 355 62 6.3 77 7.9
Over 355 65 6.6 81 8.3
SPC
224 to 250 70 7.1 87 8.9
265 to 355 92 9.4 115 12.0
Over 375 115 12.0 144 15.0
8V 335 & above 150 15.0 190 19.0
Z 56 to 100 5 to 7.5 0.5 to 0.8
A (& HA banded) 80 to 140 10 to 15 1.0 to 1.5
B 125 to 200 20 to 30 2.0 to 3.1
C 200 to 400 40 to 60 4.1 to 6.1
D 355 to 600 70 to 105 7.1 to 10.7
Method of Belt Tensioning Using a Belt Tension Indicator.
1. Calculate the deflection distance in mm, on a basis of 16 mm per metre of span.
Centre distance (m) X 16 = Deflection (mm). If distance & deflection is known, go to .2.
2. Set the lower marker ring at the deflection distance required in mm on the lower scale.
3. Set the upper marker ring against the bottom edge of the top tube.
4. Place the belt tension indicator on top of the belt at the centre of span. And apply a force at right angles
to the belt deflecting it to the point where the lower marker ring is level with the adjacent belt, on single
belt drives place a straight edge across the two pulleys to act as a datum.
5. Read off the force value indicated by the top edge of the upper marker ring.
6. Compare this force to kgf value shown in the table above.
7. Tighten or loosen belt tensioning screws to achieve the correct value.
8. If the measured force falls within the values given, the drive should be satisfactory.
BELT TENSION INDICATOR
Note:- If a belt tension indicator is not available, a suitably scaled spring balance and rule will
suffice.
DEFLECTION
IN mm
DEFLECTION FORCE
IN kgf