Posted by Steelart99 on October 17, 2017 at 18:49:10 from (72.19.159.55):
I've been working on getting an old marginally running Erickson 4058 skid steer working. This is the same as a Ford CL40 skid steer. I've done quite a bit of structural straightening, welding, repacking two hyd cylinders, rebuilt the lift/tilt hydraulic control valve, and lots more. I finally got the engine running ... someone had put in a 4 cylinder Nissan truck engine to replace the original. When I took it out to drive, it runs fairly smoothly when I only use minimal forward/reverse input. However, when I try to increase the speed of the drive input, I get what I'd call "bucking" of the entire skid steer. The engine remains running smoothly, but the wheel drives are jerky. The engine runs a 3 tier hydraulic pump system; two for L/R drive motors and a smaller pump for the lift/tilt cylinders.
Any thoughts on what might be causing this in the hydraulic system? Is there something I could do to troubleshoot this? Thanks
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