7. A belt should be just tight enough to avoid slippage.
8. Align pulleys with a straight edge to conserve belt life
and eliminate unnecessary noise.
9. Check tension before start-up, after every pulley
adjustment and regularly thereafter.
SET SCREWS:
Ensure all set screws on both pulleys and blower wheel are tight.
BELT SHOULD SQUEEZE
BY NO MORE THAN 1”
ELECTRICAL:
Connect motor in accordance with applicable codes. Provide properly sized motor overload protection to protect motor against elec-
trical faults and system changes. Confirm proper motor rotation on start-up.
MAINTENANCE:
Inspect periodically for mounting rigidity. Verify belt for wear and tension and adjust as required. Inspect wheel for any dust accumu-
lation and clean as needed. Caution — Do not dislodge balancing clips. Check set screw for tightness.
LUBRICATION:
Ball bearings with sealed in lubricant is used on all models. No additional lubrication is required.
3-1/4” Dia. Zinc Die Cast Blower Pulley — Dia. & RPM RangeBlade Length
Blower
Model
5”
6”
7”
8”
9”
10”
12”
Based On
824-1125 RPM
680-929 RPM
580-792 RPM
505-690 RPM
447-611 RPM
401-548 RPM
533-455 RPM
Motor Frame
07
4L33
4L34•
4L36•
4L38•
4L40•
- - -
- - -
09
4L36
4L38
4L40•
4L42
4L44
4L45
- - -
48 Frame
10
4L38
4L40
4L41
4L43•
4L45
4L47
- - -
12
4L42
4L43
4L45
4L47
4L48•
4L50
4L54
15
- - -
- - -
- - -
- - -
4L54
4.55••
4L59
56 Frame
• Standard Drive with 3-1/4” x 1/2” v. s. Motor Pulley •• Standard Drive with 3-1/4” x 5.8” v. s. Motor Pulley
Model VDBA Series Blower Belt Length Selection Table
Motor
Blower
Blower
Model
Belt Length
Pulley
Pulley
Based On
Cast Iron
Cast Iron
RPM Range
07
09
10
12
15
Motor Frame
HB77T
756-568
- - -
- - -
- - -
B49
143
HB87T
667-500
Note:
- - -
- - -
- - -
B51
HB97T
596-447
Blower Pulley
- - -
- - -
- - -
B52
&
#8325
HB107T
538-404
Model Number
- - -
- - -
- - -
B54
HB117T
491-368
Specifies O.D.
- - -
- - -
- - -
B56
145T
HB127T
452-339
- - -
- - -
- - -
B58
O.D. 3.25”
HB137T
418-314
Eg.
- - -
- - -
- - -
- - -
Frame
HB157T
364-273
HB47T = 4.7” O.D.
- - -
- - -
- - -
- - -
HB187T
304-228
- - -
- - -
- - -
- - -
HB47T
1630-1232
B32
B36
B38
B42
- - -
Models
HB57T
1329-1005
B34
B38
B40
B43
- - -
07 - 12
HB67T
1121-848
B36
B39
B41
B45
- - -
#IVL44
HB77T
969-733
B37
B41
B43
B47
B51
HB87T
854-645
B39
B43
B45
B48
B42
48 Frame
HB97T
763-577
B41
B45
B47
B50
B54
(Add 1” For
O.D. 4.15”
HB101T
690-521
B43
B45
B49
B51
B56
56 Frame)
HB117T
629-476
B45
B48
B50
B54
B58
HB127T
678-437
B47
B50
B52
B56
B60
Model 15
HB137T
535-404
B49
B52
B54
B57
- - -
HB157T
466-352
- - -
B56
B58
B61
- - -
143, 145T
HB187T
390-295
- - -
B63
B64
B67
- - -
Frame
HB77T
1253-1017
- - -
- - -
- - -
- - -
B52
HB87T
1104-896
- - -
- - -
- - -
- - -
B54
182, 184T
HB97T
1005-815
- - -
- - -
- - -
- - -
B56
Frame
#8400
HB107T
907-750
- - -
- - -
- - -
- - -
B58
HB117T
828-686
- - -
- - -
- - -
- - -
B59
(Deduct 2”
HB127T
756-618
- - -
- - -
- - -
- - -
B61
For 56,
O.D. 4.15”
HB137T
697-575
- - -
- - -
- - -
- - -
B63
143, 145T)
HB157T
616-509
- - -
- - -
- - -
- - -
B56
HB187T
522-435
- - -
- - -
- - -
- - -
- - -
FOR FRACTIONAL HP APPLICATIONS “4L” BELTS MAY BE SUBSTITUTED BY ADDING 2” TO THE SPECIFIED “B” BELT. EG. 850 BELT = 4L52.
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