JCB 803plus slew / dozer problem

[Russell]

Hello
I have a JCB 803plus which has very slow operation of the slew and dozer functions.
when I attempt to slew and simultaneously crowd the bucket it slews at normal speed.
The same thing happens with the dozer, slow on its own but normal when used in combination with another service.
Any advice would be appreciated
many thanks

[Muz]

Hello & Welcome .. oil is clearly being restricted somehow .. possibly a main relief being faulty or dirt preventing its normal function to the services you describe .. could also be faulty seals in any number of places.. could also be a pressure loss from the pump .. can you give us a pic of the pump ?

[Russell]

[Russell]

It has a triple pump.
pump 1 nearest the engine supplies the dozer,
slew and auxiliary.

[Muz]

It has a triple pump.
pump 1 nearest the engine supplies the dozer,
slew and auxiliary.

Very common for a bank to go down in pressure out of the 3 banks .. you'll need to do a pressure test to be sure .. but thats where to start to try to fix the problem

looks like a zexel