Hydraulic control issues

[Bounce]

Been a while since I’ve been on here but hope someone might point me in the right direction with some issues on my Dextas hydraulics.

Symptoms are:
When in position control and the control lever is raised slowly, the linkage jumps up quickly a few inches at a time rather than a nice steady lift. I can move the control lever up a couple of inches, nothing will happen, then move it a tiny bit more and the linkage rapidly lifts 4-5 inches.
The flow control makes no difference to the rate the linkage lifts.
When in qualitrol it won’t lift the linkage, but I can lift in position control, flick it back to qualitrol and it holds the linkage in that position.
When using an attachment that puts pressure on the draft control spring (eg plough) it rapidly lifts the attachment out of the ground in both position control and qualitrol before slowly dropping it back into the ground.

Hope that makes sense. Thanks in advance.

[Hair Bear]

Assuming the oil level is correct then I'd go for the oil pickup/strainer blocked.

[Billy26F5]

Here's the manual: http://www.smallholderservices.co.uk/si ... hydraulics Page 25 shows what Ford considered, but definitely check the oil and filter first. Try lifting something and pulling out the external service valve to isolate the cylinder and see how quickly it drops if at all. If it holds well don't disturb the cylinder or asociated parts of the circuit. If it doesn't replace all seals in the cylinder and asociated parts of the circuit while the top cover is off. I would do a full overhaul of the hydraulics but see what you consider as this is a job that will take a while to finish. There should be no effect from the top link in position control.
Sandy

[Bounce]

Thanks for that. The hydraulics were resealed and cleaned out last year, and plenty oil in it. Looks like I’ll be having to strip the top cover again over the winter…

[dewaltdisney]

Hi Bounce, I have a used Dexta hydraulic pump if you find you need one. Here is a link to my advert https://www.preloved.co.uk/adverts/show ... 2019950337

Thought I would put it to you in case.

Cheers

DWD