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Subject: FAN BELT CROSS REFERENCE -GATES

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Tim Daley(MI)    Posted 07-16-2018 at 15:13:56 [URL] [DELETE]        [Reply] [No Email]  
  • FAN BELT CROSS REFERENCE -GATES
  • Does anyone know the GATES cross reference part number for the 9N-8620-B fan belt? New ones these days only seem to be the 9N-8620-B (all -before s/n 263844)and the 8N-8620 is after -for angle mount distributor and new genny. Archives show lengths on early belts A, B, and C vary from 43"-45" but so what? That's why you have belt tensioning, right? I have a GATES - TRUFLEX p/n 3460 (5L460) but don't know what it fits.


    Tim Daley(MI)

    K.LaRue-VA    Posted 07-17-2018 at 16:51:30 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • I have several Type "B" belts from different manufacturers that are slightly different widths. A minor difference in width, changes how the belt rides in the pulleys, which changes actual running length. I believe some of the belts I have may be 17mm metric belts that were considered "close enough" to be labeled and sold as type "B". Those belts ride higher in the pulleys, so they run as if they are shorter than the stated length. Most of my projects require custom length belts, and I always end up buying several to get one that adjusts the way I want to run it. I generally try to run the shortest belt I can. With the 2N, a short belt keeps the alternator as far as I can get it from the steering linkage.

    Farmer Dan    Posted 07-17-2018 at 11:06:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • Why can't you wrap a 5/8" rope around it and then measure the rope? Go to NaPA and ask for a belt that long.

    Tim Daley(MI)    Posted 07-17-2018 at 14:04:42 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • I don't need a belt, just want to identify the lone one I have here. I thought there was a GATES cross reference chart here somewhere but no luck in my searching. This belt has been used so no doubt stretched out. It came in a package deal from a guy who was having problems and also came with a generator, voltage regulator, and a front coil and a side coil so no idea what he had. Upon opening the box, the first thing I notice is he has the genny pulley on backwards. I flipped it around, tested the genny (it was good) and the VR and the coils so told him I didn't see any reason to rebuild anything so was sending it all back. He said no, keep it all, he was going to put a 12V job in.

    Tim Daley(MI)


    Dud    Posted 07-17-2018 at 08:35:24 [URL] [DELETE]        [Reply] [Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • What was the final answer on the Gates cross reference number, thanks?

    Tim Daley(MI)    Posted 07-18-2018 at 08:22:32 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • FORD p/n 9N-8620-B; GATES p/n 8138.

    TPD

    Randy(PA)    Posted 07-16-2018 at 23:28:06 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • The Gates number on the replacement belt drawing 86520008 for the 9N-8620-B is 8138. The effective belt length is 45.07 inches. Using the New Holland Engineering program to calculate belt length from the drive layout on 9N-8620-B, we came up with 43.81/43.57. The difference has to do with how the belt "rides" in the sheave grooves in actuality compared to theoretical.

    Randy(PA)    Posted 07-16-2018 at 23:33:17 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • NO. No, I just made a mistake with the above answer! The length 43.81/43.57 is for the 9N-8620-A belt. The correct calculation for 9N-8620-B is 45.007/44.168

    Tim Daley(MI)    Posted 07-17-2018 at 04:17:21 [URL] [DELETE]        [Reply] [No Email]  
  • Re: FAN BELT CROSS REFERENCE -GATES
  • Thanks, Randy. Yes, I have two NOS 8620-A belts and that is what I measure them at. BTW this measurement is the circumference. Width is 5/8" . As you know, the 9N-10130 pulley drawing shows the effective diameter at 3.5". Effective diameter is given and measured as an "Over-The-Roll" dimension. This means when rolls, precisely gage pins or gage balls are laid in the VEE-GROOVE, 180 apart, the ED is measured across them. The VEE included angle is 28. Pulley bore/ID must be square to the hub face w/n .002" TIR.

    Tim Daley(MI)

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