1969 jd400 tlb no brakes

[jd400 1969]

started my 1969 jd 400 tlb up today brakes went to floor bled them and same thing pluged both lines going out and same thing took off brake valve cleaned and replaced both check valves put back on had to fabricate mounting gasket cant buy one any where started tractor and it filled with oil still no brake presure so with engine off took off fill cap and evrytime i pushed pedals down fluid went back into reverser valve dont know what to do

 

[Tx Jim]

Sounds as if one or more check valves in brake valve housing has failed. Common check valve to give problems is part # AT184434. Which brake valve mounting gasket in photo below do you need?

 

[MARK ROBKE]

I am unfamiliar with this model, but I lean towards a faulty check valve. Mark.

 

[jd400 1969]

i replaced both check valves in brake valve put back on tractor pluged both lines coming out of brake valve filled with oil push down both pedals still no preasure but when i take fill cap off valve i see when i push down pedals oil goes back into reverser valve everytime i push pedals until resevour is empty but no pedal presure

 

[Tx Jim]

Sounds as if rear axle brake piston seals have failed. Did you bleed brakes with engine operating?

 

[jd400 1969]

has nothing to do with brakes on rear axle i cap the lines coming out of thebrake valve itself and evry time i push brake pedals fluid goes back into the reverser valve and no brake pedal presure i take filler cap off and watch the fluid go away evry time i pump the pedals why would fluid be pumped back to reverser and not build up presure on outgoing brake lines thank you for helping me i just cant figure this one out

 

[Tx Jim]

Sorry I overlooked you plugged off lines leading to rear brake pistons. Does fluid return to reverser control valve if both pedals are depressed simultaneously?

 

[MARK ROBKE]

has nothing to do with brakes on rear axle i cap the lines coming out of thebrake valve itself and evry time i push brake pedals fluid goes back into the reverser valve and no brake pedal presure i take filler cap off and watch the fluid go away evry time i pump the pedals why would fluid be pumped back to reverser and not build up presure on outgoing brake lines thank you for helping me i just cant figure this one out

I meant to hit reply, not like. oops. Anyway, can the check valves be installed backwards? Mark.

 

[jtgaff]

I had an issue with a JD 300 a few years back the following was the solution, I tapped and plugged the hole

[td]Re: JD 2020 Brake Problems in reply to David Ingle, 07-17-2006 17:05:21 [/td]

Just finished getting the brakes working on a JD 400 (same as a 2020). If you remove the brake assembly off of the side of the transmission you will find a ball bearing that is used to block the hole during manufacturing of the proportioning valve. We had this ball bearing come out and it allowed the fluid to drain back into the transmission. We taped this hole 5/16-18 and inserted a set screw with loc- tite. If you have a problem with the pedel going down slowly and the level of the fluid rising in the resivour check the condition of the popet valve and make sure that it is flat on the bottom.

 

[jd400 1969]

Sorry I overlooked you plugged off lines leading to rear brake pistons. Does fluid return to reverser control valve if both pedals are depressed simultaneously?

fluid returns to reverser valve when individual pedals are depressed and when both are depressed together

 

[jd400 1969]

the hole where iam pretty sure the ball goes is at top of the valve thats where i put it back is this the hole i should plug thank you

 

[jd400 1969]

does anybody know whitch hole on brake valve that the steel ball goes in the top or the bottom when mounting valve

 

[jd400 1969]

does anybody know whitch hole on brake valve that the steel ball goes in the top or the bottom when mounting valve

 

[jd400 1969]

I had an issue with a JD 300 a few years back the following was the solution, I tapped and plugged the hole


[td]Re: JD 2020 Brake Problems in reply to David Ingle, 07-17-2006 17:05:21 [/td]

Just finished getting the brakes working on a JD 400 (same as a 2020). If you remove the brake assembly off of the side of the transmission you will find a ball bearing that is used to block the hole during manufacturing of the proportioning valve. We had this ball bearing come out and it allowed the fluid to drain back into the transmission. We taped this hole 5/16-18 and inserted a set screw with loc- tite. If you have a problem with the pedel going down slowly and the level of the fluid rising in the resivour check the condition of the popet valve and make sure that it is flat on the bottom.

would you know what hole you plugged on top or bottom of brake valve or reverser valve

 

[jtgaff]

would you know what hole you plugged on top or bottom of brake valve or reverser valve

I do not remember, I do remember the edge of the hole was a very tight fit as if it was 'Peened" or closed off some, after the ball was installed. With the assemble removed, is it possible to fill the reservoir from the top, then hand push the foot peddle to see where the fluid exits through a hole that would enter an opening where the the casting face where it bolts on. You are looking to keep the fluid between the piston/ spool and where it enters the Brake line. I think this bore is in line with the piston. I do not know how to find an example on the parts site, I will try to find my repair manual to see what it shows.

 

[jd400 1969]

thank you so much for your help with brake valve pulled away from tractor bout an inch when i push pedals down fluid comes out of bottom hole on brake valve maybe put the steel ball there and it will stop fluid from going back into reverser valve or plug it like you did

 

[jtgaff]

thank you so much for your help with brake valve pulled away from tractor bout an inch when i push pedals down fluid comes out of bottom hole on brake valve maybe put the steel ball there and it will stop fluid from going back into reverser valve or plug it like you did

My first go around was to put the ball in and Peen the hole smaller with a center point punch to hold the ball in. That lasted about 9 months, I then tapped and plugged the hole, no issue since.