Description:8-10 & 12 TON. MODEL WR. 2-4 & 6 TON. This Service Manual applicable to all WR presses after Serial No. 23101 and WS presses after Serial No. MULTIPRESS ws Series|21|10:034|10| 20 59|23|| 7 18 a 22;. --130HC-28 .. Lower the bottom stop collar far enough to allow ram to exert full pressure