Hey guys, I am looking for a little advice on what to check next in regard to troubleshooting a weak hydraulic issue on my 2016 M62. The swing function on my backhoe is weak, in both directions. I bought a hydraulic test kit and a few extra fittings to allow connection to the output ports on both the right swing and left swing, at the control valve. I measure 2500 psi when swinging to the right limit on the right output and the same 2500 psi on the left output when swinging to the left limit. This is with the engine RPMs set high. This 2500 psi measurement is within the factory specification for the relief valve setting pressure (2460 to 2560 psi). There are no leaks anywhere. The machine is clean. I would not think that the swing cylinders need rebuild already. It does not appear that the backhoe was heavily used by the previous owner. The machine only has 600 hours on it.
The symptoms include inability to push bucket-deep piles of excavated dirt sideways with the bucket (using swing function). And a momentary loss in swing cylinder pressure when going from movement in one direction to movement in the other direction. For instance, if the machine is on a slope, swing the backhoe to the left, stop, then attempt to swing the backhoe to the right. The backhoe will momentarily swing left, before it takes off to the right.
Could there be an issue with the swing valve spools or maybe the load check valves in the control valve body? But, wouldn't problems with these components show up as low pressure readings?
Any help would be greatly appreciated! I tried calling Messicks Tech Support; and the guy I spoke with was worthless. I spent a good 5 minutes arguing with him whether or not their was a dedicated pump for the swing function on this machine. He claimed there is not a seperate pump for the swing function. He believed that all backhoe functions run through one pump. That's about as far as I got with that guy.