The valves A and B are same type, over center valves.
Valve C is a sequence valve.
1. Free wheel the winch.
2. Pull the lever as the winch should pull, (drum will not turn as it is in free-
    wheel position.)
3. The gauge should read approx. 40-50 bars.
4. Push lever as the winch should back out cable. The gauge should read 40 -50
    bar higher than previous reading.
5. If not, turn one of the A or B valves set screws. If as example setting A would
    not make any difference in pressure reading try B. Make sure you know how
    many turns you did and turn it back to start position.
6. When done with A&B settings engage the winch again for test.
7. Pull winch lever and the winch cable starts to pull. Now turn valve C until the
    winch gear down to low speed. Turn the set screw back slowly until winch
    gear up to high speed and leave it there. Your winch should now work without
    problems.