John Deere 7810 trailer brake adjustment

[Tom Sewell]

Brakes work fine on our 7810 but are poor with grain trailer on. How do we adjust them? It's a '97 power shift. Thanks

 

[Hesston4860s]

Brakes work fine on our 7810 but are poor with grain trailer on. How do we adjust them? It's a '97 power shift. Thanks

How olds your trailer ? Reason I ask is how do you know it's the tractors brake valve and not the trailer brakes which are FUBAR ?

 

[CJay]

Can't on the tractor as far as I know, had a similar issue on a 6910 turned out hydraulic brake valve was sticking a bit, but the brakes on the tractor where fine with or without trailer, it was just that the trailer brakes wouldn't come on

 

[Tom Sewell]

I have 3 trailers all with tip top brakes that work fine on our 7530 and previous 6920s I thought there was a trailer brake valve we could adjust but no clues in operators manual!

 

[Db880]

Trailer brake valve pressure isn't adjustable. The adjustment on the valve only adjusts the point at which the trailer brakes are applied when the pedal is depressed. The trailer should always respond first. If you have a problem get a gauge plugged on the brake coupler. It won't be as high as a spool valve pressure. Could be a coupler issue, or the valve itself

 

[Timbo]

Standard tractor - trailer brake pressure is 100-120bar

 

[Db880]

Or in old money around 1800 psi. Worth checking though.

 

[mojo4900]

Im my experienced, faulty brake valve symptoms were trailer brakes not releasing, ie tractor not letting oil back when foot taken off, new valve , good as new. above advice about checking pressure would be worthwhile before spending £350.