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Fordson Tractors Discussion Forum

1962 FSM Injection Pump Drive Coupling

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Author  [Modern View]

12-09-2013 06:27:55

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I am needing to replace the drive coupling for the Simms pump. The pump drive flange is no longer available from CNH and only available aftermarket. I recently purchased the entire part assembly via Ebay and found that the keyways are cut too small. A further web search seems to suggest that this particular part is made by only one facility, but sold by many vendors [they seem to all use the same photo of the part]. Have any of you successfully replaced these parts and where did you obtain them? Or, have any of you encountered the same problem, and how did you solve it? Please note that I am not referring to the fiber disc, which is still available from CNH, but to the steel flanges on both the pump and drive shaft. I have the capabality to recut the keyways, but would prefer not to go that route. I can return the parts, but that leaves me nowhere at this point. Thanks for any ideas!

Thanks for any ideas!

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mike farmer

12-16-2013 11:49:05

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 Re: 1962 FSM Injection Pump Drive Coupling in reply to Eben51, 12-09-2013 06:27:55  
Hi follow up to mine. The only ones I can find in UK are also 5/32. Sorry. Looks like a hammer and chisel job at the weekend.
Regards etc Mike

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mike farmer

12-14-2013 09:58:32

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 Re: 1962 FSM Injection Pump Drive Coupling in reply to Eben51, 12-09-2013 06:27:55  
The pump keyway changed at engine No1599502. I am looking at dealers this side of the pond to see if its available here. Mike

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12-09-2013 08:57:30

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 Re: 1962 FSM Injection Pump Drive Coupling in reply to Eben51, 12-09-2013 06:27:55  
Two different sized keys and key ways on Major tractors, the later ones had a wider key and key way. Your coupling is for a Fordson Major Diesel up to about 1962.

Try your CNH dealer, the Fordson Super Major was sold as a Ford 5000 until 1964. Not to be confused with the later 5000 which is a totally different tractor.

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12-10-2013 06:38:23

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 Re: 1962 FSM Injection Pump Drive Coupling in reply to Majorman, 12-09-2013 08:57:30  
Thanks for the comments. Yes, I had checked with CNH website and found that the same coupling flange on the injection pump was used from 1952 thru 1964, and that replacements are no longer available. The keyway change was made on the auxilary drive shaft [drives the pump], not the pump shaft. The diesel repair shop that is doing the service on the pump and injectors is returning the old flange as well as the aftermarket one so that I can decide what to do. The only problem with the old flange is that the pegs [ears] are worn. My best option may be to build up with weld and cut/dress to the original profile. The drive flange on the auxilary shaft is an easier fix because it is in two parts. I can swap the disc that has the new pegs for the worn disc and re-use the old hub that has the correct keyway.

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12-09-2013 08:52:17

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 Re: 1962 FSM Injection Pump Drive Coupling in reply to Eben51, 12-09-2013 06:27:55  
Followup information:
Repair manual mentions production change at earlier serial number where keyway on auxilary drive shaft was increased from 5/32 to 3/16 inch. This may answer half of the question, but does not help with the pump flange.

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