1680 Hydraulic Drive System Pressure - The Combine Forum
 
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post #1 of 5 (permalink) Old 07-05-2019, 02:26 PM Thread Starter
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1680 Hydraulic Drive System Pressure

Hydraulics are getting weak. I am thinking about bypassing my foot-n-inch valve by capping the lines and testing how it drives, to see if that is my issue, but was wondering if anyone has ever hooked up gauges to the system and if they would have pictures on how to do so. Looks like the working pressure of a corn/soybean combine is around 5500 PSI. I have documentation on how to preform the test, but not sure where the gauges should be hooked up. Has anyone ever capped the foot-n-inch valve and tested it that way? Thanks!

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post #2 of 5 (permalink) Old 07-07-2019, 12:44 PM
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Go to 1680 slow hyd. post. Shim up the relief to gain additional pressure may help your problem.
https://www.thecombineforum.com/foru...-slow-hyd.html


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post #3 of 5 (permalink) Old 07-08-2019, 10:13 AM
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Had tried to post a pic from manual and ended up with super long text thing . But in the manual it shows that you use two ports on the block on the end of the motor close to where the foot and inch hoses go in . There is also relief valves in the back of the motor that could cause problems . The pressure is controlled by the foot and inch valve and there is an adjustment shim package available but it mentions that the pedal should allow the valve to completely close without any restriction from the sealing gasket under the floor .
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post #4 of 5 (permalink) Old 07-08-2019, 02:50 PM Thread Starter
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Originally Posted by RunninREDharD View Post
Go to 1680 slow hyd. post. Shim up the relief to gain additional pressure may help your problem.
https://www.thecombineforum.com/foru...-slow-hyd.html
This looks to be for the aux pump for the header height and reel lift and such. I am talking about the main drive system that is controlled by the foot-n-inch valve (clutch pedal) in the cab.
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post #5 of 5 (permalink) Old 07-08-2019, 02:51 PM Thread Starter
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I found a really good video on YouTube from Herr Machining. It shows them doing a bench test of the hydraulic pump and the drive motor. They actually explain on which port to hook gauge up to and the pressures. I believe all the test parts are dash 4 size (1/4").
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