Operating Manual
Belt Small Pulley Recommended
Section Diameter Deflection Force
Range Newtons
mm min max
XPZ
SPZ
XPA
SPA
56
60-63
67-71
75-80
85-95
100-125
132-180
80-125
132-200
7
8
9
10
11
13
16
18
22
11
13
14
15
16
19
24
27
31
An incorrectly tensioned belt will cause belt
slip and short belt life. An excessively
tensioned belt will overload both belts and
bearings. Always use a belt tension gauge
fo setting up.
Isolate the drive unit and pump from all power
and control supplies before attempting to work
on adjusting the belts.
1. Measure the span length.
2. Calculate the required deflection: ('x')
100mm span length = 1mm deflection
therefore :
400mm span length = 4mm deflection
3. Refer to the table for recommended
minimum and maximum deflection force
for small pulley diameter range.
To convert Newtons to pounds force
multiply by 0.2248.
To convert Newtons to kilogrammes
force multiply by 0.1020.
4. Use a belt tension gauge with the figures
to determine the belt adjustment required.
5. Belt tension adjustment is achieved by
adjusting the nuts on the pedestal frame.
6. Finally check that all nuts are re-tightened
and the belts can move 'freely' by hand
(depending upon pump size and system
design).
7. Ensure the pulleys are kept vertically and
horizontally to each other and aligned as
per diagrams (A) and (B).
Force 'X'
Span
Note : The above table indicates the common
pulley types used on the pump ranges. Details
for other pulley types will be available on request.
(B)
(A)
4.5 Pulley Belt Tension Adjustment
14
