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7710 Rear Arms Not Moving


 
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JeremyArmes
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PostPosted: Fri Jan 11, 2019 5:19 pm    Post subject: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

Linkage is intact and moving. Could it only be in the lift housing?
 
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Sean in PA
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PostPosted: Sat Jan 12, 2019 5:35 am    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

If the linkage is turning the shaft that goes inside the top cover and the arms aren't lifting, then it could be something internal to the top cover, or it could be the pump isn't pumping.
 
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JeremyArmes
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PostPosted: Sat Jan 12, 2019 6:30 pm    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

Thanks, Sean. The shaft to the lift cover is moving. My pressure at the pump taken right above the line to the dual power is 125 psi at idle at cold start. After running a few minutes, the pressure drops to 55-60 psi at idle. The rear arms do not move at all and the only fluctuation I see in pressure is when I switch the dual power from high to low or vice versa.
 
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Sean in PA
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PostPosted: Sat Jan 12, 2019 9:01 pm    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

The pump in that tractor is actually two pumps in one body. The front part is the main pump for the 3 point lift, which should be able to create well over 2000 psi. I believe that the rear part of the pump is for both the independent PTO and dual power and generates much less pressure, somewhere in the 160 psi range I believe.
 
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JeremyArmes
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PostPosted: Sun Jan 13, 2019 7:33 am    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

The PTO works, I have nothing hooked to the remotes to see but, was told they were working. Does the relief valve in the priority pack control the rear arms or is there another relief valve inside the lift housing? Thanks for the help.
 
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Sean in PA
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PostPosted: Sun Jan 13, 2019 4:01 pm    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

JeremyArmes wrote:
(quoted from post at 11:33:30 01/13/19) The PTO works, I have nothing hooked to the remotes to see but, was told they were working. Does the relief valve in the priority pack control the rear arms or is there another relief valve inside the lift housing? Thanks for the help.


I said that there are two pumps in there. The 3 point pump pressure is independent of the other pump that powers the PTO clutch and dual power. If the remotes do indeed work then the 3 point pump should be working fine, but is that just what you were told by the person that sold you the tractor?
 
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JeremyArmes
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PostPosted: Sun Jan 13, 2019 4:37 pm    Post subject: Re: 7710 Rear Arms Not Moving Reply to specific post Reply with quote

After more checking, there little to no pressure at the remotes. The main pump is new, I removed it today and it is visibly fine. This tractor has a trailer brake valve that is supplied directly off the top of the pump. Can this valve cause no pressure to the remotes and three point? I removed the priority valve and disassembled, it looks good and all the valves are moving freely.
 
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