Mercedes 722.6 NAG1 Oil Pump Body With Gears Cast 0320 W5A580 5-Speed Used

Mercedes 722.6 NAG1 Oil Pump Body With Gears Cast 0320 W5A580 5-Speed Used

Used OEM unit pulled from an inspected donor transmission, cleaned and visually inspected before listing. Photos show a representative unit of this exact part and variant — see the fitment and casting notes below to confirm your match.

• SKU: MB-722-PM-U-02
• Includes: You receive the 722.6 front oil pump body casting with the internal pump gears (drive gear and driven gear) installed, exactly as the supplier describes it: "PUMP BODY WITH GEARS, PUMP CAST: 0320." NOT INCLUDED: the converter/pump cover plate, the front pump seal, the pump body bushing or bearing (whatever is in the bore is the original used one), the pump-to-case O-ring/gasket, the stator support, and any bolts. This is a checked good used core, not a remanufactured or factory-tested unit - the supplier explicitly states internal components are not guaranteed to be all present or assembled correctly.
• Warranty: 30-day return-or-replace after delivery
• Shipping: UPS Ground from our Tennessee warehouse, 2 business day handling

OEM / interchange references (verify against your casting/tag):

• 2202770320
• A2202770320
• 78510AA

Fits (engine/year matters — read carefully): Front (input) oil pump body with gears out of a Mercedes-Benz 722.6 five-speed automatic, casting suffix 0320 (Mercedes A 220 277 03 20). The 722.6 was fitted to Mercedes-Benz rear-drive cars and SUVs from roughly 1996 through 2014 - C-Class (W202/W203), E-Class (W210/W211), S-Class (W140/W220/W221), CLK, CLS, SL and SLK, ML (W163/W164), GL, R-Class and G-Class - behind M112 3.2L/3.7L V6, M113 4.3L/5.0L/5.5L V8, M272 3.0L/3.5L V6, M273 4.6L/5.5L V8, and OM647 2.7L I5, OM648 3.2L I6 and OM642 3.0L V6 CDI diesels.

Important: Four things to check on your own pump before you order. (1) THE CASTING SUFFIX - this is the big one. Buffalo/BEC stocks three 722.6 pump bodies that are the same diameter, same bolt pattern and look identical in photos: cast 0120, cast 0220 (Mercedes 140 277 02 20) and cast 0320 (Mercedes 220 277 03 20). This one is 0320. Pull your pump and read the raised/stamped number on the body - only the last four digits matter. Ordering by year and model instead of by casting is how buyers end up with the wrong one. (2) BUSHING VS BEARING - the 722.6/722.9 pump body was built with a plain bushing in the center converter-hub bore, and later with a caged needle bearing after Mercedes had bushing spin-out problems. Look straight into the center bore: a smooth bronze/brass sleeve is bushing style, visible caged rollers is bearing style. Match what came out of your unit.

Before you order: confirm your transmission code and casting/part numbers. Not sure? Message us through eBay with your VIN or transmission tag and we will confirm fitment the same business day. Rebuilder shops — ask about volume pricing. We stock transmission hard parts by family and can hold inventory for scheduled builds.