jensen tracked chipper creeping.

[carlos]

we have a tracked jensen 530 chipper, we were using it on a steepish tarmac drive and noticed it had crept forwards right up against the landrover, it also crept the other way when we tried it, very slowly. any ideas, iam guessing leaking valve or something ?

thanks carl

[dumper]

Almost certainly a valve in spool block ,seal maybe, how old is chipper ? Question is why has seal gone is something else about to let go and metal splinters contaminated oil ? Or are your seals old and worn 

[PeteB]

The drive motors have an internal brake. Ordinarily, you would need flow to unlock the brake. I would suggest that an internal seal has broken and the brakes are gradually getting pressurised by the leak and effectively getting took off. Quite dangerous, would suggest that you put a block in front of each track to prevent a run away.

[Jase hutch]

Easy enough to test , park on a slope and stop the engine , waggle the tracking levers to relieve any pressure and see what happens  ? If it moves then it can only be the internal brakes as Pete has mentioned. 

They are held on by spring pressure and released by hydraulic pressure..

Edited August 27, 2020 by Jase hutch

[carlos]

thanks for all the replies, we found out that it did still creep when switched off, very slowly as in hard to tell if its moving at all.

would one of the drive brakes not hold it?

could they both be worn?

can you service the drive motor brakes?

its not too bad at the moment but i guess it will only get worse with time, so hope to get it fixed before we find it wedged against the clients range rover!!

thanks again carl

[swinny]

I'll try to follow this as mine walks off when on a banking Lol....  Usually just put a choc in front of it

[GJT]

Just as an addition to Carls post the wood chipper is creeping when the engine is off, how exactly do you fix that problem? 

Also do you need to do both sides?

Just wondering if it's a complicated job or something we could do ourselves?

Thanks. 

[Stubby]

On 03/09/2020 at 09:31, GJT said:

Just as an addition to Carls post the wood chipper is creeping when the engine is off, how exactly do you fix that problem? 

Also do you need to do both sides?

Just wondering if it's a complicated job or something we could do ourselves?

Thanks. 

Just think of all the fuel you are saving ?