York B4IH-360, Technical Information

Page: 30 / 64

0
14 - Pulley adjustment and belt tensing
1.- Adjusting pulley
- Loosen the belts. Loosen tensing screw "A".
- Loosen studs "B" to release mobile rims "C".
- Turn both rims, on the thread of the fixed core of the pulley,
in the adequate direction to increase or decrease pulley
aperture.
Attention: Both channels must have the same clearance
(the same number of opening turns).
- Tighten studs to a maximum, coinciding with their seat in
the fixed hub core of the pulley.
2.- Belt tensing
- Tense with tensing screw "A".
- If no belt strain gauge is available, use the following practi-
cal method:
- Apply a pressure of 5 kg on the midpoint of the belt, and
perpendicular to same.
- With this pressure, the belt should move from 12 to
14 mm.
.- It is recommendable to check belt tension twice during
the first 24 operating hours.
Caution:
Disconnect all power supply to the unit before
carrying out any of these operations.
F=5 Kg
12 - 1
4 mm
B
STUDS
A
TENSING
SCREW
D
.P
.
FULLY CLOSED POSITION
(OR TURNS), MAX. Ø D.P.
D
.P
.
THE MORE OPENING TURNS,
THE LESS Ø D.P.
FIXED CORE
C
B
(X4)
B
(X4)
C
MOBILE RIM