H754 - HARVESTER HEAD 4462 Valves H754 H754 Parts group 4462 Valves H754 H754 4462 Valves H754 H754 . Valve Block Saw Block, Classic (Parker Saw Motor) Saw Block, Classic (Parker and Bucher Saw Motors) FlashCut, Prop. Saw Flange Pressing, Option Feed Motor, Block Valve Block, Including. SC Chain Tightening Valve (Feed Wheel Motors) (1140 - ) Base Block Rotator Block, Standard On-Off, Optional Rotator Block, Proportional, Optional Delimbing Knives Block Valve Block (Feed Wheels Cylinders) Tilt Block Pressure Valve (Gradation) Valve Block, Chain Tightener, Option