I have looked for a any possible short cuts! You could remove the side frame but you will have as much or more labor in doing that as you will in pulling the reverser. However, you can't pull the valve body without pulling the reverser. These are things that can be checked without pulling the reverser. There is also a pressure relief valve that can get stuck or break a spring and cause your issue. You could also have either the engagement valve or the lube oil valve stuck or may have broken springs as well. This can cause the clutch valve to not operate properly. There are pieces to it that can get worn both inside and outside of the valve body. The other possibilities would be the clutch valve itself. Given the information you have given us, I would suspect you have either a accumulator spring broken or the adjustment bolt has come out of the piston. You really need to check the pressures first.
