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Farmall & IHC Tractors Discussion Forum
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966 Hydraulics... More Pieces, More money

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Migraine

01-23-2005 09:18:13




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Worked all day on the 966 again. Got all new filters and fluids in. Took outside for test and still have the awful gear whine from the pto or pump gear I guess. The steering is still sluggish brakes are so so and no TA at all. Back into the shop we go and drained the fluids out , pulled the covers off and the pump out. Have the correct amount of backlash on the pto gear it seems with no unusual wear patters and seems to mesh well with the top gear there. The pump gear does seem to have an edge on the backedge of teeth but nothing to bad. The only markings on the pump are a capital "P". I was thinking that these were either Cessna or Thompson pumps? Did someone say that there were several options or pump gear teeth that were only changed by 3 degrees? It also appears that the oil pressure seal inside the pump was slightly damaged on installation, and does not float freely to expand against the housing? Sorry about the long post. I will get this figered out with the help of you I.H. guys. Maybe I just need a new pump that I know is corect. Thanks .Migraine

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JJK

01-23-2005 14:19:41




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 Re: 966 Hydraulics... More Pieces, More money in reply to Migraine, 01-23-2005 09:18:13  
If the gear noise came all of a sudden it could be that the splines are shot on the pto drive gear. This is splined to the pressure plate and drives the MCV pump and pto. Symtoms are little or no steering, brakes, TA, and pto. You can take the bottom cover off and look up inside the bellhousing to see (or hear) if that is the problem. As for the MCV pump there is only one pump available now to put back in that I'm aware of. One has been discontinued.

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trulyred

01-23-2005 14:17:52




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 Re: 966 Hydraulics... More Pieces, More money in reply to Migraine, 01-23-2005 09:18:13  
You probably have the 25 degree gear (newer gear) against the older drive gear. On later 66 series many of the gears in the transmission were changed to 25 degree. The 25 degree pump gear was used with a mcv spacer to compensate for the larger drive gear. Also there are two different thickness mcv gskts. I never had any trouble using the thinner one when there was over a thousand hrs. on the tractor.

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