Hello, I have 1970 hough loader,, it has NO brakes,, i changed the brake booster,, system seems to be buidling air to 60 or so,, fluid is full and i did bleed all for tires.... Please does anyone have any ideas or suggestions,, i dont know where to go from here! Thanks
Try to find the right book for your Hough - This place http://www.tractorparts.com/misc.htm has reprints for some, I got my Trojan one from them. Mine had 2 bleeder valves on the hydrovac assembly, I never would have found without that book, just can't see them. Stops on a dime now, as they say........
60 psi isn't enough air to start with,,,, govenor should kick out at 120 psi. Do you have decent fluid pressure at the wheel cylinders? If good pressue there then you have problems in the wheels, but I doubt all 4 wheels would go bad at once. Are the brake shoe's all adjusted up to spec? If they are not it will take all the hydraulic pressure just to move the shoe's against the drums. I'd start out by adjusting all the shoe's up to spec.
A common problem is the pistons in the wheel cylinders corrode and seize, stopping any pressure from the brake booster being transferred into braking pressure at the shoes. You need to dismantle the wheel brake assemblies and check that the wheel cylinders are all working fine. If the pistons are corroded and stuck in the wheel cylinder bore, the wheel cylinders need to be totally dismantled by soaking in a rust-removing solution - then you need to check to see if the cylinder bores are pitted where the cups seat. If the bores clean up with a hone, then you can just install new cups and wire brush the pistons and re-assemble. Coat the outer surface of the pistons with anti-seize upon re-assembly to reduce any future corrosion problems. If the bores are still pitted after honing, then you need to sleeve the cylinders, or purchase complete new wheel cylinders. You'll find that the wheel cylinders are a pretty standard Bendix or Lockheed-Wagner model of wheel cylinder, and are generally still readily available new, from brake parts suppliers.
Maybe im not building enough pressure,, maybe compressor is not putting out... I had good brakes a few months ago, stopped on a dime. I got awesome flow at each wheel.. Hard to believe all four wheels would go at once... Maybe... But even at 60 psi shouldnt i get some stopping? I mean i got nothing.. You can feel pressure on the pedal like the air is there..
I'm with grandpa, my service manual says that air pressure needs to be 90-120 psi.
if you have good flow at the wheels, then either your brake shoe's are out of adjustment or worn out,,,, hard to believe you have NO brakes on all wheels, but if you got the pressure there, it has to be in the wheel.
Ok. I have 120 psi in tank, new booster, pedal sounds good and feels like a good air pedal, got fluid at all four tires,,is there anything im missing? I just find it hard to believe all four wheel cylinders would go all at once,,,, Is there any other bleeders? Or a hyrovac? And if so where is that? I had a trojan they didnt have that... Thanks
Maybe they all didn't go at once.? One wheel cylinder working good could possibly give you the false feeling of all brakes working. If you have good pressure at the wheel bleeders and the brake shoe's are set up to spec's, it has to be disfunctional wheel brake cylinders.
What type of fluid have you been using in the system. Some of those used brake fluid and some used hydraulic fluid. Put the wrong type in and you will end up with big problems, all at once.
The master cylinder could have gone bad. If the seals are leaking internally, you would have fluid at the wheel cyl. but no pressure to force them out.
Worked on a Terex 71-42 wheel loader that lost brakes and it turned out to be a Bendix TR-3 Inversion Valve was leaking air. The terex has 2 master cylinders,1 for the front wheels and 1 for the rear wheels and one res. that fed both master cylinders. Each has an indicator on the master cylinder. One of the bolts holding the master cylinder to the air chamber has a pin that extends when the brakes are applied. Never worked on a hough so i'm just tossing some info.