jcb 320s Priority valve tapping/surging

[Nav man]

JCB 2014 TM320S- In need of some more suggestions. Tapping/surging sound occurs once machine warmed up. its coming from priority valve and appears to pressuring one of the hoses on and off with noise. I have fitted new brake accumulator and new pressure transducer sensor in priority valve. Changing the accumulator sorted brakes when engine turned off but didn't fix the noise.

any suggestions would be most welcome before i give up and let dealer have a costly look

thanks.

 

[Chris W]

Checked the emergency steer accumulator ?

 

[Nav man]

Checked the emergency steer accumulator ?

is that the one on the same block is brake accumulator. (the smaller one)?

 

[Nav man]

UPDATE: It was the steering accumulator in the end. All sorted now. Thanks again for the suggestions.

 

[Nav man]

UPDATE: It was the steering accumulator in the end. All sorted now. Thanks again for the suggestions.

Update 2, I spoke to soon. Still not fixed . So new brake accumulator fitted, new steering accumulator fitted and still pulsating when warm.
Any other thoughts ?

 

[Nav man]

I have attached video of problem. both accumulators replaced with new genuine jcb parts but still appears to be continually pressurising brake circuit as shown by pipe in video which goes to trailer brakes flexing.