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670 hydraulic leak


 
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Jersey Jim
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Joined: 04 Feb 2017
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PostPosted: Tue Oct 12, 2021 7:13 am    Post subject: 670 hydraulic leak Reply to specific post Reply with quote

I have a problem with a 1969 670 Super diesel with closed center hydraulics and 3 speed torque. Hydraulic fluid is leaking from the hydraulic system into the transmission to the point hydraulic oil has come out from the gear shift boot. There is no leaking of hydraulic oil to the engine or engine leaking into the hydraulic oil. The only place I know that the hydraulic oil could get into the transmission is the little line that goes to the top link bracket.
If that is the problem, what is the problem causing the hydraulic oil to go thru that line? Thanks, Jim
 
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MMDEL
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PostPosted: Tue Oct 12, 2021 8:04 am    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

Better get that fluid drained down to level soon or you will have axel seals and seals on the brake pinion shaft leaking on the brakes.
MMDEL
 
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molinegb
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PostPosted: Tue Oct 12, 2021 4:00 pm    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

Three speed has a hydraulic slave cylinder that controls torque.
 
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Jersey Jim
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PostPosted: Wed Oct 13, 2021 2:39 am    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

Does the little pump on the back of the tractor control the 3 speed torque? Is that a complete sperate system from the closed center system?
 
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molinegb
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PostPosted: Wed Oct 13, 2021 1:36 pm    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

Know theory on 3 speed but not sure of location of components. Hydraulic supply may be on back but slave cylinder would have to be near A/T to shift.
 
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molinegb
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PostPosted: Wed Oct 13, 2021 3:24 pm    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

Pump on back is lube pump. Torque control valve on top of transmission. Looks like torque itself is the cylinder. Agco parts online shows setup. Better hope it's not in torque.
 
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Jersey Jim
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PostPosted: Wed Oct 13, 2021 4:22 pm    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

If that valve is leaking or bad, would it dump oil into the transmission?
 
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BMG1
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PostPosted: Thu Oct 14, 2021 3:40 am    Post subject: Re: 670 hydraulic leak Reply to specific post Reply with quote

The 3 speed ampli-torc is shifted via a valve body inside the transmission and uses transmission fluid in its engagement circuit. It would not be the cause of your transmission being overfull on hydraulic fluid.
 
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