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NORTH AMERKAN <br /> BELT DRIVE • • •lksKTR7�EN SOLUTIONS <br /> MOTOR, PULLEYS & BELTS (See Table below) <br /> 5. Pivot the motor platform to tension the V-belt and lock in place using the 2 bolts on both sides of the blower. (Ideal belt tension <br /> is the lowest tension at which the belt will not slip during start up.)As shown in illustration to right, a proper deflection of 1/64 of <br /> the belt span is desired for belt tension. <br /> FIGURE 1 BELT ALIGNMENT DEFLECTION = A / 64 <br /> V ---------- <br /> /'s;�7 7/\ <br /> CORRECT WRONG WRONG <br /> A <br /> 3 1/4 CAST <br /> • BELT LENGTH <br /> BLOWER MODEL 5" 6" 7" 8" 9" 10" 12" BASED ON <br /> 824-1125 RPM 680-929 RPM 580-792 RPM 505-690 RPM 447-611 RPM 401-548 RPM 533-455 RPM MOTOR FRAME <br /> SF5/SF5-3PH 41-39 41-41 41-42 41-44 4L46 41-47 -- <br /> SF7/SF7-3PH 48 FRAME <br /> SF8/SF8-3PH 41-42 41-44 41-46 41-47 4L49 41-51 -- <br /> SF9/SF9-3PH <br /> SF10/SF10-3PH -- -- -- -- 4L55 4157 4L60 56 FRAME <br /> Motor Pulley Blower Pulley RPM BELT LENGTH <br /> Cast Iron Cast Iron RanSF5 and SF7 SF8 and SF9 SF10 BASED ON <br /> MOTOR FRAME <br /> H847T 1630-1232 B39 B43 -- <br /> HB57T 1329-1005 B41 844 -- <br /> HB67T 1121-848 B43 B46 -- <br /> HB77T 969-733 B44 648 B52 <br /> HB87T 854-645 B46 B49 B54 48 FRAME <br /> IVL44 HB97T 763-577 B48 B51 _ B56 (ADD 1"FOR 56 FRAME) <br /> O.D.4.15" HB107T 690-521 B50 B53 B58 MODELS SF10 <br /> HB117T 629-476 B51 B55 __ B59 143,145T FRAME <br /> HB127T 578-437 B53 B55 B61 <br /> HB137T 535-404 B55 B58 _ B63 <br /> HB157T 466-352 B59 B62 -- <br /> HB187T 390-295 B65 B68 -- <br /> HB77T 756-568 -- -- B51 <br /> HB87T 667-500 -- -- B53 <br /> HB97T 596-447 -- -- B55 <br /> 8325 HB107T 538-404 -- -- 856 143T&145T <br /> O.D.3.25" HB117T 491-368 -- -- B58 FRAME <br /> HB127T 452-339 -- -- B60 <br /> HB137T 418-314 -- -- B62 <br /> HB157T 364-372 -- -- -- <br /> H687T 854-645 -- -- -- <br /> _ HB97T 763-577 -- -- -- <br /> _ HB107T 690-521 -- -- -- <br /> 8400 HB117T 629-476 -- __ __ 182,184T FRAME <br /> O.D.4.15" HB127T 578-437 -- __ _ (DEDUCT 2"FOR 56,143, <br /> HB137T 535-404 -- __ __ &1451) <br /> HB157T 466-352 -- -- -- <br /> HB187T 390-295 -- -- -- <br /> HB117T 828-686 -- -- -- <br /> 8550 HB127T 756-618 -- __ _- 182,184T FRAME <br /> O.D.5.35" HB137T 697-575 -- __ _- (DEDUCT 2"FOR 56,143, <br /> HB157T 616-509 -- __ _- &145T) <br /> DOUBLE GROOVE <br /> D8600 O.D.6" 12.4 X 2B 830-700 -- __ __ 213,215T <br /> 13.6 X 2B 759-631 __ __ __ FRAME <br /> FOR FRACTIONAL HP APPLICATIONS"4L"BELTS MAY BE SUBSTITUTED BY ADDING 2"TO THE SPECIFIED"B"BELTS.Eg.850 BELT=41-52 <br /> WARNING <br /> ' EXCESSIVE BELT TENSION IS THE MOST FREQUENT CAUSE OF BEARING WEAR AND RESULTING NOISE. <br /> PROPER BELT TENSION IS CRITICAL FOR QUIET EFFICIENT OPERATION. <br /> Ideal belt tension is the lowest value under which belt slip will not occur at peak load conditions. <br />