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Description:F series: 1) Conform to API specification 2) Long stroke length and relatively low strokes per minute 3) Continuous tooth herringbone gear 4) One-piece alloy steel crankshaft 5) Renewable crosshead guides 6) Frame fabricated with steel plate welding 7) Double compartmentalized construction for extension rod packing 8) Power end utilizes the combination lubrication system of forced lubrication and splash lubrication 9) Liner is positioned by screwed pot covers 10) F-1300/1600 mud pumps are equipped with a hoist 11) With a device for easy replacement for liners from the frame top 3NB300: 1) Maximum bore x stroke: 130 x 101mm 2) Type gear: herring bone 3) Gear ratio: 3.045:1 4) Lubrication: pressure and splash 5) Nominal horse power rating: 160kW/215HP 6) Valve of pump: API4# 7) Weight: 5,820kg 3NB500: 1) Maximum bore x stroke: 177.8 x 190.5mm 2) Type gear: herring bone 3) Gear ratio: 4.296:1 4) Lubrication: pressure and splash 5) Nominal horse power rating: 410kW/550HP 6) Valve of pump: API5# 7) Weight: 9,000kg 3NB800: 1) Maximum bore x stroke: 177.8 x 250mm 2) Type gear: herring bone 3) Gear ratio: 4.069:1 4) Lubrication: pressure and splash 5) Nominal horse power rating: kW595/800HP 6) Valve of pump: API6# 7) Weight: 14,600kg 3NB1000: 1) Maximum bore x stroke: 177.8 x 250mm 2) Type gear: herring bone 3) Gear ratio: 4.069:1 4) Lubrication: pressure and splash 5) Nominal horse power rating: kW735/1,000HP 6) Valve of pump: API7# 7) Weight: 16,800kg