Parts Manuals User guide
Form P-RDF, P/N 270069 R6, Page 21
Blower Pulley - Size 2-80, 2-120, 119 and 120 systems equipped with 3 and 5 HP mo-
tors with a 15.4" diameter and larger blower pulley or a 7-1/2 HP and larger motor and
all Size 3-180, 3-260, 122, and 130 systems are equipped with a split taper bushing
in the blower pulley. The split taper bushings must be loosened in order to remove the
pulley. Follow these instructions to loosen the bushing.
3 Cap Screws
Split Taper
Bushing
2 Push-Off
Holes
1) Notice that there are three cap screws in
the bushing and two holes without screws,
called push-off holes (see illustration).
2) Remove the three cap screws.
3) Put two of the cap screws into the two push-
off holes. Tighten these two screws evenly
until the pulley is loosened.
4) Pulley may now be removed from the shaft.
2) On the outer locking ring, locate the two locking screws that are directly
across from each other. Loosen, but do not remove, those two screws.
Do not loosen any other screws.
3) Adjust sheave to desired pitch diameter by turning the outer locking ring.
One complete turn of the outer locking ring will result in .233" change in
pitch diameter. To increase blower speed, decrease diameter. CAUTION:
Do not adjust sheaves in either direction to the point where moveable
and stationary anges are in contact.
4) After completing adjustment, tighten both locking screws in the outer
locking ring.
5) Replace belts and move motor away from the drive shaft to apply suf-
cient belt tension to prevent slippage. Be sure that the belts are aligned
in the pulley grooves properly and are not angled from pulley to pulley.
6) Always check motor amps with an amp meter after RPM adjustment. The
maximum motor amp rating on the nameplate must not be exceeded.
Notes and Key to Option Codes on Drive Tables, pages 21-27
Option ............ RPM
AM6 ................ 651-700
AM7 ................ 701-750
AM8 ................ 751-800
AM9 ................ 801-850
AM10 .............. 851-900
AM11 ............... 901-950
AM12 .............. 951-1000
Option ............ RPM
AM13 .............. 1001-1050
AM14 .............. 1051-1100
AM15 .............. 1101-1150
AM16 .............. 1151-1200
AM17 .............. 1201-1250
AM18 .............. 1251-1300
AM19 .............. 1301-1350
Option ............ RPM
AM20 .............. 1351-1400
AM21 .............. 1401-1450
AM22 .............. 1451-1500
AM23 .............. 1501-1550
AM24 .............. 1551-1600
AM25 .............. 1601-1650
AM26 .............. 1651-1700
Option ............ RPM
AMA3 .............. 301-350
AMA4 .............. 351-400
AM1 ................ 401-450
AM2 ................ 451-500
AM3 ................ 501-550
AM4 ................ 551-600
AM5 ................ 601-650
NOTE : Where 575V (AK8) is listed, the two corresponding AL option lines above apply to all other voltages with that HP.
Model RDF 1-20
Open Motor
Horz/Vert
Discharge
Drive Option
(See table
above.)
CODE 200 - Motor Sheave CODE 201- Blower Sheave CODE 202 - Belt
CODE 203
- Bushing
HP Option P/N Mfr No. Bore P/N Mfr No. Bore P/N Mfr No.
1/2
AL4 V AM6-9 7962
1VL40 5/8
111607
AK74
3/4
50513 A52 -
AL4 H AM6-9 7962 111607 50470 A43 -
AL4 V AM10-15 7962 105480
AK54
50475 A49 -
AL4 H AM10-15 7962 105480 105493 A39 -
3/4
AL5 V AM8-11 105476
1VL44
5/8
111682
AK71
3/4
50513 A52 -
AL5 H AM8-11 105476 111682 50470 A43 -
AL5 V AM12-16 7962 1VL40 105479 AK49 65403 A48 -
AL5 H AM12-16 105476 1VL44 111684 AK59 50500 A41 -
AL5 V AM17-21 13013
1VM50
105480
AK54
88558 A50 -
AL5 H AM17-21 13013 105480 50500 A41 -
1
AL6 V AM10-15 7962
1VL40
5/8
105480
AK54
3/4
50475 A49 -
AL6 H AM10-15 7962 105480 105493 A39 -
AL6-AK8 V AM10-15 106748
7/8
105480 50475 A49 -
AL6-AK8 H AM10-15 106748 105480 105493 A39 -
AL6 V AM16-20 13013
1VM50
5/8
111684
AK59
65404 A51 -
AL6 H AM16-20 13013 111684 105493 A39 -
AL6-AK8 V AM16-20 37451
7/8
111684 105493 A39 -
AL6-AK8 H AM16-20 37451 111684 65404 A51 -