FILM-STRIPE 1142497 - Caterpillar

Illustration 1 g00955898
M318D, M318D MH, M322D, and M322D MH Main Control Valve (1) Plug (bucket shock reducing valve) (2) Plug (travel shock reducing valve) (3) Plug (stick shock reducing valve) (4) Plug (stabilizer/dozer shock reducing valve) (5) Plug (Boom shock reducing valve)
Illustration 2 g00923953
M316D Main Control Valve (1) Plug (bucket shock reducing valve) (2) Plug (travel shock reducing valve) (3) Plug (stick shock reducing valve) (4) Plug (stabilizer/dozer shock reducing valve) (5) Plug (Boom shock reducing valve) (6) Plug (VA boom shock reducing valve)
Illustration 3 g02422138
Shock Reducing Valve (7) Passage to control valve (8) Orifice check valve (9) Passage to pilot control valveThe shock reducing valves are located in the main control valve in the pilot line supply passage for the following positions: boom raise, boom lower, bucket close, bucket open, forward travel, stick in, stick out, blade/stabilizer up, blade/stabilizer down, VA boom raise and VA boom lower.When the pilot control valve lever is moved, pilot oil is sent from the pilot control valve to passage (9) of the shock reducing valve. Pilot pressure acts against the surface of orifice check valve (8) in order to unseat the valve. This action will permit oil flow to the control valve spool through passage (7). Full pilot oil is now allowed to flow to the main control valve to move the control valve spool. When the pilot control valve is placed in the NEUTRAL position, the pilot oil is restricted from returning to the hydraulic tank by closed orifice check valve (8). Closed orifice check valve (8) reduces the speed of the main control valve spool as the spool returns to the center position. Slowing the flow of the pilot oil causes the hydraulic control valve spool to return to neutral gradually in order to help to reduce shock loads at the end of the spool travel.