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TimJr

PowerMax/720 brakes

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TimJr

I am going to be working with an Allis 720 soon for a relative.  He feels the brakes don't work well.  I haven't driven it yet, and it has been a number of years since I have driven a PowerMax/720 style tractor.  His has the 31x15 dune buggy style Terra Tires.  He says he can't really use the brakes for turning - it doesn't stop the inside tire of the turn to cut around sharp.  Supposedly pedal free play is OK, but the brakes just don't hold.  Any thoughts or experience from people with these big tractors?  His only attachment is a belly mower.  Tim

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PGL

Based on what I read of the experience of others, the brakes on these are poor and subject to getting oil on them so I never tried cleaning them off or replacing.  Not really needed for my usage, just use the hydrostatic and steering wheel and occasionally put on the brake lock or put down the FEL and turn off the engine to keep in place.

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TimJr

So I finally got to drive the tractor in question.  After a couple of applications of a brake (either side), they felt like they grabbed better.  With a fair amount of pedal pressure, I am able to lock up the inside tire of the turn - either side.  Kind of standing on the pedal, but the brake will lock up.  It has been a lot of years since I have driven another one, so I can't really compare.  On a fairly steep hill, not too steep to be unsafe, but the tractor won't stay still with the parking brake locked.  If I push the pedals down, it will hold, and if I hold the parking brake lever up - it will stay.  Once I let go of the park brake lever, the tractor will roll.  I haven't looked into the parking brake for how it locks the pedals, but hopefully there is some adjustment to keep it locked harder.  Any thoughts?  Tim

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720nut
On ‎9‎/‎7‎/‎2017 at 8:42 PM, TimJr said:

So I finally got to drive the tractor in question.  After a couple of applications of a brake (either side), they felt like they grabbed better.  With a fair amount of pedal pressure, I am able to lock up the inside tire of the turn - either side.  Kind of standing on the pedal, but the brake will lock up.  It has been a lot of years since I have driven another one, so I can't really compare.  On a fairly steep hill, not too steep to be unsafe, but the tractor won't stay still with the parking brake locked.  If I push the pedals down, it will hold, and if I hold the parking brake lever up - it will stay.  Once I let go of the park brake lever, the tractor will roll.  I haven't looked into the parking brake for how it locks the pedals, but hopefully there is some adjustment to keep it locked harder.  Any thoughts?  Tim

Tim sure your first one I've heard of being able to actually get brakes to work, would love to have mine work like that but a lot of work

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D-17_Dave

The parking brake lever engages the brake pedal linkage by just wedging against a cam and finger. Not the best design. I've found if you adjust the pedal travel to a longer pedal stroke, it will allow the park cam to engage at a bit better angle thereby holding a better tension on the brakes. 

Clean, oil free brake disc's and scuffing the metal surface that the disc's contact will help the brakes. Make sure when servicing the brakes that the ball bearings and the grooves in the spreader actuators are completely smooth for free travel and lubricated with grease. Heavy red greas is my preferance as the cohesion keeps it on the bearings longer. 

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