slow moving rams?

[cosworth34677]

ok my converted bruder excavator has developed a problem the rams all move slow, the power is there and the pump is spinning fast to fast but the movement seems to be slow and in time with the pump.

im using the magome hrc kit and and a flysky radio. in the thing. been working really good for a while now starting to be a problem any help? or idea what can be causing this? and i'm still in search for something other than anti freeze to run as hydraulic fluid.