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Gas engine power outputs must be approximately twice the pump power requirements shown above. We recommend a 1.15 service factor be specified when selecting an electric motor as the power source. To compute specific pump horse power requirements, use the following formula: HP = (GPM X PSI) / 1450 SPECIAL NOTE: The theoretical gallons per revolution (gal/rev) is 0.0089. To find specific outputs at various RPM, use the formula: GPM = 0.0089 x RPM P420A-3100/5100 PUMP PARTS LIST ITEM PART DESCRIPTION QTY. ITEM PART DESCRIPTION QTY. 1 08377 Crankcase 1 16G 07161-0100 Copper Washer 3 2 08378 Oil Fill Plug with Gasket 1 17 07314 Crosshead Pin 3 3 06479 Crankcase cover 1 19 08366 Oil Seal 3 3A 07186 Oil Sight Glass w/ Gasket 1 20 08098 Seal Case 3 4 08380 O-Ring 1 21 06613 O-Ring (P420-3100) 3 5 12137 Oil Drain Plug 1 21 07266 O-Ring (P420-5100) 3 5A 07182 Gasket for Oil Drain Plug 1 22 08059 O-Ring 3 5B 08092 Plug with Gasket 1 23 12254 V-Sleeve 3 6 08093 Screw 4 23A 08099 Spacer Ring 3 6A 08094 Spring Washer 12 23B 12255 Weep Seal 3 7 08471 Bearing Cover, Open 1 24 08376 Pressure Ring 6 8 08472 Bearing Cover, Closed 1 25 06373 Weep Return Ring 3 8A 06245 Shim 1 26 06614 Manifold (P420-3100) 1 9 01016 O-Ring 2 26 06374 Manifold (P420-5100) 1 10 08095 Screw with Washer 8 27A 06615 Valve Assembly (P420A-3100) 6 11 07459 Radial Shaft Seal 1 27A 06375 Valve Assembly (P420A-5100) 6 12 08473 Bearing 1 27 06376 Valve Seat 6 12A 08474 Bearing 1 28 08371 Valve Plate 6 13 08475 Crankshaft 1 29 06377 Valve Spring 6 14 08091 Fitting Key 1 30 08372 Valve Spring Retainer 6 15 08390 Connecting Rod Assembly 3 31 07212-0001 O-Ring, Viton (P420A-3100) 6 15A 07311 Screw with Washer 6 31 07212 O-Ring (P420A-5100) 6 16 06611 Plunger Assy. Items 16A-16G 3 32 06616 Plug (P420A-3100) 6 16A 08096 Plunger Base 3 32 06379 Plug (P420A-5100) 6 16B 08398 Plunger Pipe 3 33 07214-0100 O-Ring, Viton (P420A-3100) 6 16C 07256 Centering Sleeve 3 33 07214 O-Ring (P420-5100) 6 16D 08097 Tensioning Screwing 3 34 06612 Inner Hexagon Screw 8 16E 07023 O-Ring 3 36 13150 Plug, G 3/4" (P420-5100) 1 16F 07203 Backup Ring 3 37 13321-0100 Plug, G 1" (P420-5100) 1 P420A-3100/5100 PUMP TORQUE SPECIFICATIONS Position 15A 16D 32 34 Item# 07311 08097 06616/06379 06612 Description Screw with Washer Tensioning Screw Plug (P420, P422) Inner Hexegon Screw Torque Amount 216 in.-lbs. 240 in.-lbs. 125 ft.-lbs. 35 ft.-lbs. EXPLODED VIEW - P420A-3100/5100 PUMPS Plunger Packing Kits # 09542 (P420-3100) Item Part # Description Qty. 21 0661з O-Ring з 22 08059 O-Ring о з 2з 12254 V-Sleeve 23B 12255 Weep Seal з 24 08з76 Pressure Ring 6 Plunger Packing Kits # 09140 (P420-5100) Item Part # Description Qty. 21 07266 O-Ring з 22 08059 O-Ring з 2з 12254 V-Sleeve 23B 12255 Weep Seal з 24 08з76 Pressure Ring 6 Oil Seal Kit # 09306 Item Part # Description 19 08366 Oil Seal Qty. з Valve Assembly Kit (P420A-3100) # 09522 Item Part # Description Qty. 27A 06615 Valve Assembly, Complete 6 зз 07214-0100 O-Ring, Viton б Valve Assembly Kit (P420A-5100) # 09478 Item Part # Description Qty. 27A 0бз75 Valve Assembly, Complete 6 зз 07214 O-Ring б з з REPAIR INSTRUCTIONS - P420A-3100/5100 PUMPS Note:Always take time to lubricate all metal and nonmetal parts with a light film of oil before reassembly. This step will ensure proper fit, at the same time protecting the pump nonmetal parts (i.e., the elastomers) from cutting and scoring. 1) With a socket wrench, remove the three discharge valve plugs and three inlet valve plugs (32). Inspect the o-ring (33) for wear and replace if damaged. 2) Using needle nose pliers, remove the inlet and discharge valve assemblies (27A). Note: It may become neccesary to remove the valve seat (27) from the valve casing using a slidehammer. 3) By inserting a small screw driver between the valve seat (27) and the valve spring retainer (30), the valve assembly can be separated. Remove the o-ring (31). Inspect all parts for wear and replace as necessary. Apply one drop of loctite 243 to the valve plugs (32) and tighten to 125 ft. lbs. Use a 8mm allen wrench to remove the 8 socket head cap screws (34). Carefully slide the valve casing (26) out over the plungers. Remove the weep return rings (25). 6) Remove each seal case (20) with o-rings and oil seals (21 and 22) from the crankcase (1). 19 22 20 21 24 23(B) 2S 24 23 23A OO® GOO. OO Note: The orientation of oil seal in seal case is: seal lips face crankcase. 7) Remove the pressure rings 8) Inspect all parts for wear and replace as needed. (24). and v-sleeves (23) and spacer ring (23A) from the valve casing (26). Remove the remaining v-sleeves (23B) and pressure rings (24) from the seal case (20). REASSEMBLY INSTRUCTIONS - P420A-3100/5100 PUMPS 9) Check surfaces of plunger pipe (16B). 10) Place each seal case (20) with new o-rings (21 and 22) and new oil seals (19) over plungers (16) with weep hole down. Generously lu...

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