Hydraulic's not working /no return pipe

mosshog · Post by **mosshog** » Sat May 31, 2008 11:23 pm

I bought a Dexta late last year and the Hydraulic's have not lifted when the tractor was first started, but worked after 2/3 mins of playing with the control lever, and then they where fine for the rest of the day.

Now they have stop completely

I have taken the top cover off and found there is no return pipe . I there-fore think I will get no where with out the pipe and its back pressure valve , am I right ?, and its only by chance they have worked.

Please can someone with some no how point me down the right road.

Many thanks Andy

Post by **Brian** » Mon Jun 02, 2008 7:39 am

No return pipe and back pressure valve means the lift cannot work propertly.
The system needs a back pressure of 12 to15 psi for the unload valve to work properly. This is set and maintained by the valve in the return pipe and filter.
The unload valve is the most important valve in the system if things are to work correctly.

mosshog · Post by **mosshog** » Mon Jun 02, 2008 7:41 pm

Hi,
Thanks for your reply, now i just need to find a pipe, why it has ever been taken out , i will never no ,

Thanks again Andy

mosshog · Post by **mosshog** » Tue Jun 24, 2008 8:57 pm

Hi,
I have got my self a return pipe and valve , but its was rusty , and could not find a hole in the pipe to let oil into the filter. I have cleaned the pipe up in de-rust remove and there is a small hole about 1mm appeared . Is this the right size of hole ?, or do i need to drill it bigger.

Many Thanks Andy

Post by **Oscar** » Wed Jun 25, 2008 5:57 am

You'll have to be a bit patient, I'm afraid. Brian will be gone until Monday or so

.

Tubal Cain · Post by **Tubal Cain** » Fri Jun 27, 2008 6:40 am

I can confirm that a single 1mm hole is correct.

Gerald

mosshog · Post by **mosshog** » Tue Jul 01, 2008 12:29 am

Thanks all.

BarryT · Post by **BarryT** » Tue Jul 01, 2008 1:51 pm

Brian,

On this subject of hydraulics, a colleague of mine has got himself a Super Dexta but cannot for the life of him get the arms to lift?? he's had the top off and checked all the bits known to him but cannot find the problem. What are the areas to check and what is the correct position of both levers to operate the lift arms on the Super Dexta.

Regards,

Barry

Post by **Brian** » Tue Jul 01, 2008 2:03 pm

Barry,

Its the same lift as the Dexta so as longas the main control lever is at the top of the quadrant it should lift.

Try pulling the aux Service out and seeing if you can here the pump load with the lift lever up. See if oil comes from the aux service point.

Try another aux service chest.

Try pushing on the Qualitrol/Position control lever whilst trying to lift. If the lift comes up, the linkage is worn/out of adjustment.

Book me a holiday cottage and I'll come up and sort it

BarryT · Post by **BarryT** » Thu Jul 03, 2008 12:30 pm

Hi Brian,

Thanks for those tips which I will pass on to my colleague at our vintage club. What a shame all the local cottages are taken this time of year, but if you ever decide to visit this little corner of Wales I could set you up in a very nice static caravan which my Mother-in-Law lets out on the farm.

Regards,

Barry

P.S. And plenty of tractors to see to keep you amused.

Post by **Brian** » Thu Jul 03, 2008 1:21 pm

I could always bring my caravan!