Hi, have a drive problem with my komatsu pw 75, when you press the travel pedal to move in either direction the machine tries to move but its as if the brake is on for a couple of seconds then all is fine, this happens every time i stop to change direction/ work. Its also impossible to move at very slow speed smoothly especially going down hill, just jerky as hell (imagine trying to pour concrete into shuttering etc whilst moving forward). Am hoping someone on here may have had similar problem and say its an easy(ish) fix. Thanks.
Could it have air in the system?
It may well have air in system. I can hear the machine build up pressure for a couple of seconds then releases and off we go. So was thinking maybe a valve or something out of adjustment. A pressure test might be the best bet to start off. Another thing which may give someone a clue is when going down hill it surges every 5 seconds or so. Very annoying.