Should have 900 psi to orbitrol from hyd manifold
I've seen orbitrol a crap out and pumps as well

Hi all I have a heli HFB 15 2004..4 wheel zapi

Problem being the truck will get intermittent tight steering

When operating the steering the pump does change note...when the steering goes tight the pump note sounds the same as when under normal load..it's a very simple system but I must admit this problem is giving me a headache..

Is there any pressure points that the pump pressure or orbital can be checked..iv checked king pins and steering ram and links all fine..

Any advice greatly appreciated

Hello send me your e mail. we will try and find some manuals :)

prenticelift at gmail dot com

Hi! Is the steering stiff even if you use sidesift or tilt to the end, and steer at same time. I had once similar issue and the fault was stuck steerin relief valve. Did you mean drivespeed is slowing down at same time? Then it cant be mechanical broplem in hydraulics.
I didnt hear about cpd205? I guess its cpd20 or 25? Is it basic four wheel counterbalance with AC motors and what is the year? I guess you will find zapi manuals on its website. Heli manuals are poor.