CASE 850 - Transmission Control Valve/Braking/Steering issues

Alex1617 said:

Ok
I have a 750k dozer 04 model I was having problems with it not moving forward or back I got the right track to move but the right side try’s to move but just moves about inch and stops do y’all think it might be the break and the break pedal is real soft

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Hi Alex i hope you solve your problem i won,t be much help all i have is two real old machines 1967 case 750 1957 Cat 955 both totally different brakes.The case has no brakes when i got her the pedals were cut of and most of the inside parts were missing after a lot of research and answers from other members the conclusion was not to fix them because they were too expensive and did not work that well anyway.Thereis some members who still felt brakes were needed for loading but if you have just a blade machine you may be alright but going to job sites loading and unloading my be difficult with no brakes

I live in hill country, would NOT have a machine no brakes as dangerous. Worked in quarries where trucks had no brakes for any length of time, operators accepted that as a norm and injuries did occur, not really smart.

Totally agree with you
I am retired and have a piece of land in the country where i haul about 15 cords of wood home to burn in my garage this also heats my house pipes under ground.
The only reason i have the 750 is to maintain the driveway and putting some wood roads in.
I do not use it commercially
I knew the brakes were gone when i got it.This machine has not had brakes since the early 70s.Every time i find a machine like this (old 850s too) the brakes are a thing of the past because they are a poor design if you try to use them to stop your machine will speed up .I did a lot os research on these machines this was the norm back in the day(not saying its right but if you ever operated one you would know what we are talking about)When you push the brake pedals it releases the transmission and if they are wet dirty wore or a leak or etc.etc.they will not stop the machine.They were to say the least high maintenance hard to work on and lots of downtime if you demanded they work.
Just my two cents but old Case dozer or loader operators will all agree with me.

May be true but following another down a dark path is not always smart, fixing the problems is. Seals, bad bearings allowing leaks, repairing brakes to maintain some level of function is better than none. Riding the sled backward down a hill unable to stop is asking to die.

This is just one of many post about these machines found when doing research
but i agree it does not solve the problem of trying to stop a stalled machine on hilly ground.
i am going to try to set up a braking system that can be used if the machine stalls something like a disc brake setup on a monster truck only putting this on the brake shafts sticking out of the transmission = see picture

Dozerbill63
Well-Known Member Joined: Nov 12, 2012 Messages: 65 Location: Repton , Al. Brakes ?

You don' t even need brake pedals on a 450 or 850 , I removed the pedals completely off both of my 450s , you steer case crawlers with the levers , true enough the pedals are for quick turns , away from trees , basement walls and such . If you do not know much about the brakes ,they can get you killed . Loading case crawlers on trailers is the most dangerous thing you can do using brake pedals . If you push the pedals half way , you will free travel , pedals must be pushed all the way. You are suppose to steer with the levers PEROID !

Last edited: Dec 30, 2013

Brakes are brakes, no brakes is just foolish. Know all too many with these particular crawlers, they still keep brakes functional and Yes am aware steering done by the levers on these. Allis and Cat were opposite, levers were clutches Only and often had to nudge a brake for better response. Deere is a breed unto itself with this in mind too.

frankieavalanche said:

This is just one of many post about these machines found when doing research
but i agree it does not solve the problem of trying to stop a stalled machine on hilly ground.
i am going to try to set up a braking system that can be used if the machine stalls something like a disc brake setup on a monster truck only putting this on the brake shafts sticking out of the transmission = see picture

Dozerbill63
Well-Known Member Joined: Nov 12, 2012 Messages: 65 Location: Repton , Al. Brakes ?

You don' t even need brake pedals on a 450 or 850 , I removed the pedals completely off both of my 450s , you steer case crawlers with the levers , true enough the pedals are for quick turns , away from trees , basement walls and such . If you do not know much about the brakes ,they can get you killed . Loading case crawlers on trailers is the most dangerous thing you can do using brake pedals . If you push the pedals half way , you will free travel , pedals must be pushed all the way. You are suppose to steer with the levers PEROID !

Last edited: Dec 30, 2013

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I totally agree with you Frankieavalanche, if they were not suppose to have brakes they wouldn't have come out with them on the machine. But sometimes the OEM stuff just doesn't work or last as long as they should. I know this is several years since you inquired on this brake stuff, but I just retired and been a service tech for a const company for past 30 years and a service tech for a JD dealer 16 years before that. I was just asked by a farmer that has a Case 850 about brakes not working on one side and that is how I found all this "GREAT" info. I'm trying to decide if I want to run from this job or prove to myself that all mechanical problems can be solved or improved. From all the comments from some owners that have took they brakes off, you should be able to collect enough parts to reassemble your machine. From what I see these brake systems are like several systems used on older Oliver, Case,International, Deere,etc. You have 2 thick round metal plates with 3-5 balls setting in recesses in between the plates. The recesses have ramps on them so the plates can rotate in opposite directions , therefore making the 2 plate assembly thicker when rotated in opposite directions and putting outward pressure on each brake disk with facing , that is spline to shafts extending from transmission. With the 2 plate assembly and both brake disk encapsulated between the wear plate against the transmission case and the outer cover housing, there fore applying a braking force to transmission shaft that is connected to transmission output shaft for each final drive unit. Springs connected to each thick plate pull plates back to collapsed position therefore releasing pressure against brake disk. There is links connected to each thick plate that are connected to a common pull rod, so that when the rod is pulled it pulls the links together , therefore rotating the thick plates in opposite directions. Yes the weakness of this system is the brake disk getting glazed over from heat, wear dust, oil from seal, outside contaminates thru pull rod hole. But if you can put enough pressure on that pull rod, you can stop anything as long as the clearance between all the parts involved do not exceed the travel of the 2 thick plates as they spread apart. The hardest part of connecting an extending cylinder ( for hydraulic enhancement) to this system is engineering a lever system that can with stand the pressures that can be applied. Hope this info helps somebody as much as the info I discovered on here has helped me.