Case 4240 Brakes

[Bloders]

Right!
A friend has a case 4240.
We have bled the brakes and it works fine. However, if it is left parked up for a few weeks, the brakes no longer work and need bleeding again.
I have cleaned the little header tank out, cleaned the two pipes feeding and empting the tank and the restrictor valve.
The tubes in the tank are positioned correctly as far as i can see, so it is holding the correct level of oil.
Can anybody help please, as to why the brakes need bleeding after the machine has been stood for a few weeks.
thank you

 

[john432]

Think them tractors use transmission oil for the brake fluid, problem is probably the piston seals in the brake units in the back axle slowly leaking when parked up.

 

[Bloders]

Think them tractors use transmission oil for the brake fluid, problem is probably the piston seals in the brake units in the back axle slowly leaking when parked up.

thanks. that souns like a big job.
trumpets off job i assume?
thank ewe

 

[john432]

Yes trumpets off, probably worth changing the brake discs while its appart, and changing the back end oil and filters, then at least youve done some good for all the work. Old Massey I had suffered from the same symptoms if left parked for a month, new brake piston seals cured it.

 

[Zebbedee]

Is the reservoir emptying when it is left for a long period? More than likely is which would indeed point to leaking piston seals in the trumpet housings

 

[Bloders]

Yes trumpets off, probably worth changing the brake discs while its appart, and changing the back end oil and filters, then at least youve done some good for all the work. Old Massey I had suffered from the same symptoms if left parked for a month, new brake piston seals cured it.

thank you.
Anyone got a workshop manual for it?

 

[Bloders]

Is the reservoir emptying when it is left for a long period? More than likely is which would indeed point to leaking piston seals in the trumpet housings

ill try and look. its dificult to see. thank you

 

[Zebbedee]

Just pull one of the hoses that go to the cylinders, not the two with the metal stack pipes in them

 

[spin cycle]

if oil leaks past the piston seals....where does it go

 

[Zebbedee]

if oil leaks past the piston seals....where does it go

Just goes in to diff casing/transmission

 

[Tractor_dealer]

Most probably just needs bleeding
Oil leaks down from the master cylinder reservoir when idle
Common fault
Sometimes the metal pipe slips down from inside the tank
Causing the resovoir to store less oil.

 

[Bloders]

Just pull one of the hoses that go to the cylinders, not the two with the metal stack pipes in them

sorry - after disconnecting the two hoses (or one of them) then what?

 

[Bloders]

Most probably just needs bleeding
Oil leaks down from the master cylinder reservoir when idle
Common fault
Sometimes the metal pipe slips down from inside the tank
Causing the resovoir to store less oil.

Have checked this, but thank you.
Have bled it several times now. Brakes come up fine. park machine up and when you go back to it, brake pedal straight to the floor.

 

[Zebbedee]

That was remove the hose after tractor sitting for a while to check if there was still oil in reservoir, as if it drains out empty it points to leakage at brake pistons,( or possibly master cylinders but they are external so would be visually leaking and uncommon anyway)

 

[Bloders]

That was remove the hose after tractor sitting for a while to check if there was still oil in reservoir, as if it drains out empty it points to leakage at brake pistons,( or possibly master cylinders but they are external so would be visually leaking and uncommon anyway)

got it. thank you