I was given an old H70 in good shape. I am going through the machine and found it does not like going from Rev or Neutral to 1st-3rd. Once it is in 1st, I can shift fine up to 3rd and back to 1st, but it doesn't like going back into Rev or Neutral. I have to push it pretty hard to get in to switch gears. Is this a common issue? What should I be inspecting?