Have 853 bobcat , rebuilt the valve body hoping to restore hydraulic system,after rebuild the machine would still not move forward or back so I took it do a authorized dealer and had a remain hydrostatic pump installed . When it was delivered I have the issue I am currently having ,before pump was installed arms worked great . Dealer is saying that my machine came in with lift arm problems so no help with dealer . Any help would be appreciated it's been down way too long.Thank you.