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4250 PST


 
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cmickey12
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PostPosted: Mon May 03, 2021 11:59 am    Post subject: 4250 PST Reply to specific post Reply with quote

i have a 4250 jd tractor and i just rebuilt the transmission the shifter valve housing and clutch housing (didn't touch the transmission pump) but if i let the tractor low idle the trans pressure light pops on but if i'm over 1500 rpms it goes out...plus it doesn't like to engage in reverse when you start the tractor.....my lube pressure are within spec according to the tech manual....the preliminary element leakage checks for b1-c-1-c2 are as follows:
clutch not depressed
b1 130PSI (park)
r1 (c1) 125
r2 (2) 130
Clutch depressed
park (c1) 140 PSI
r1 (c1) 130 PSI
r2 (c2) 140 PSI
 
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rockcreek4630
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PostPosted: Mon May 03, 2021 4:02 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote

Put gauges into system and lube ports
adjust rpm to get around 10 psi on the lube
gauge go through gears and watch for
pressure drops
 
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cmickey12
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PostPosted: Mon May 03, 2021 6:37 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote

CVPost-rockcreek4630 wrote:
(quoted from post at 17:02:50 05/03/21) Put gauges into system and lube ports
adjust rpm to get around 10 psi on the lube
gauge go through gears and watch for
pressure drops



I have done this 3 times with the same results
 
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cmickey12
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PostPosted: Tue May 04, 2021 1:54 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote


and everytime i push the clutch in and engage in r1-r3 with the clutch coming out at close to the top i loose the gear
 
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cmickey12
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PostPosted: Tue May 04, 2021 1:56 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote


with no real pressure drops... all gears hold roughly 9-10 but stablizes to 10 psi
 
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rockcreek4630
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PostPosted: Tue May 04, 2021 5:34 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote

With system pressure low when you shift it
dips and is probably kicking in the
engagement override valve can you shim up
system pressure
 
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cmickey12
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PostPosted: Tue May 04, 2021 5:56 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote

Yes I can it doesn't have any shims in it didn't have any when I rebuilt the pst
 
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cmickey12
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PostPosted: Thu May 06, 2021 9:34 am    Post subject: Re: 4250 PST Reply to specific post Reply with quote

ok system pressure was 140 psi at 2000 rpms at 110 degrees
added 7 shims to bring to 180 psi at 2000 rpms at 110 degrees with clutch depressed but only 140psi clutch up and there is an odd sound like a throbbing sound from around the priority valve to rocker arm housing
 
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rockcreek4630
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PostPosted: Thu May 06, 2021 4:29 pm    Post subject: Re: 4250 PST Reply to specific post Reply with quote

I am not sure what you mean by rocker
housing. But with that pressure drop you
have a leak your lube pressure should be
dropping of to c low and b 1 are the only
ones used in park. If you get the same
pressure drop in all the gears with clutch
up and down I would say there is a problem
in the clutch valve body.
 
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