I have a Hyster H180E forklift. Serial #B7P-6794T LPG GMC V6 engine, manual transmission.The clutch booster was leaking and when you would push the clutch petal in it was very hard to engage,if you rev up the engine and then push the clutch petal in it is very easy to do, but the gears grind when you try to engage them forward or reverse. I had the clutch booster resealed put it back in the forklift and now the clutch petal is very hard either way i try it using throttle or no throttle, the gears still grind engaging the shift leaver and the top actuating piston is leaking from the inner seal. The clutch rod attaches to this piston rod. Is there a pressure adjustment for the hydraulic fluid that goes to this unit, two lines go to it. So i can make the petal pressure easier?