It would be item number 8 in the Hercules drawing
These engine were used in numerous construction type of applications and also military applications because of its robust construction
This hose goes between the self bleed fitting and the first injector tee
657-34281 Overhaul gasket set for models LPW/S/G
750-41610/050 Piston assembly, used on the LPW and the LPWS Lister Petter series engines. D4800 It would be item number750 41610 050 Piston assembly, used on the LPW Lister Petter engines. This assembly includes the piston, rings, wrist pin and the cir clips, items 1, 2, 3, and 4. Please study the parts page provided here to ensure proper part. This piston is . 050mm oversize (20 thousands). This will be item number 1, 2, 3, and 4 in the Lister Petter drawing. DO NOT USE THIS PISTON FOR AN LPWS ENGINE, LOOK UP PART NUMBER 750 40094