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Clooney / John T (720 power steering pump)

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Rooster in Tenn

12-31-2002 08:57:05




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Hey guy's got the pump off, had too move the radiator about 2". The fan shaft is worn that goes into the coupler. In the back of the pump their was no bearing or snap ring. There was just one seal in the back. Can I get the fan shaft out with out pulling the governor houseing?




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Rooster in Tenn

12-31-2002 12:49:40




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 Re: Clooney / John T (720 power steering pump) in reply to Rooster in Tenn, 12-31-2002 08:57:05  
Thank's guy's for help. The pump shaft is worn badly, also the coupling are worn badly too. Will it run a good while with the badly worn shaft's. The bearing was shot, that's was why the seal was leaking. I got the fan shaft out and it is worn about the same. A new fan shaft & coupling and pump shaft are $350. Happy New Year!



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Clooney

12-31-2002 13:21:45




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 Re: Re: Clooney / John T (720 power steering pump) in reply to Rooster in Tenn, 12-31-2002 12:49:40  
Rooster, if the shaft is worn in the seal area the new seals won't last long, if the shaft is worn in the bushing or gear area the gears will float around & wear the housing excessively, if the pump shaft is worn at the splines they will probably strip within a short time, or in cold weather when a high pumping pressure load in placed on the shaft. The same with the shaft & couplings if they are worn. You will be doing it again if you don't repair it correctly now. Maybe you could call around & find some decent used parts.

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John T

12-31-2002 12:55:38




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 Re: Re: Clooney / John T (720 power steering pump) in reply to Rooster in Tenn, 12-31-2002 12:49:40  
I also hate to spend the big bucks in that situation, but if its worn that badly and now once that youre already in there, I guess I would sure go ahead and replace the shaft and coupling because you sure dont want to have to do this all over agian in only a few years. One vane pin down inside the pedestal was also broke on my 620, so I went ahead and fixed it plus new seal wipers. Good Luck, Ol John T

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Clooney

12-31-2002 10:54:48




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 Re: Clooney / John T (720 power steering pump) in reply to Rooster in Tenn, 12-31-2002 08:57:05  
Rooster, on the pump, there is a bushing in the rear & that sealed bearing in the front. If the pump has been leaking fluid out of the front, you should install a new bearing as most of the grease has probably been washed out of the original sealed bearing.
~The original pump seals were long double seal units, the replacements use 4 seals, [2 front & 2 rear .....4 - AR21900R seals & 1 - R21720R spacer washer]....The spacer washer goes between the rear two seals. If you buy 2- R21720R washers you can install one between the seals & use the other as a driver to drive the rear seal in without damaging it....
~You should be able to get the fanshaft out, but will either have to pull the radiator out of the way or pull the front part of the fan tube. If you are careful you can get the fan tube off the front of the vent pump without disturbing the vent pump or disturbing the gear mesh shimming gaskets at the rear. Check & replace the pump gear drive keys & fan drive clutch disks [if worn thin]. When reassembling the pump use a [very thin] layer of [thin] gasket sealant between the pump halves, & remove the burrs from the pump shaft, then lubricate the pump shaft so you don't nick the seals when assembling. I also use a light coat of sealer in the seal bores so they don't seep oil between the seal o.d. & the housing. Be very careful pressing those seals in as they are easily distorted when installing. Go slow & if something doesn't seem right, or if in doubt about the next move, post back, [trust me] you don't want to have to pull that pump & do it again.

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John T

12-31-2002 10:48:20




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 Re: Clooney / John T (720 power steering pump) in reply to Rooster in Tenn, 12-31-2002 08:57:05  
Rooster, youre gonna get ur puter dirty workin on that dern JD and then typing lol. Its been almost to many moons for my memory cells to remember all this form since we did those 720's, but heres what I kind of remember. The fan shaft will come out okay without removing the governor, but then it has to be reinserted way back deep inside that tube is the problem. The original seals were big one piece units, while we now have to use two separate ones. My shaft splines were worn fairly bad also, but I re used it but replaced the half moon keys for the gears. Happy Newy Year, quit on that dern old tractor and go out and celebrate now, but save money if you need to buy a new splined fan shaft. Ol John T Nordhoff

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