Front oil pump for the Mercedes 722.6 five-speed, also sold as the NAG1 and W5A580 in Jeep, Dodge and Chrysler applications.
This front oil pump is for the Mercedes-Benz 722.6 five-speed automatic and the same transmission Chrysler, Dodge and Jeep call the NAG1 or W5A580. If your C-Class, E-Class, ML, Grand Cherokee, Charger, 300 or Sprinter is slow to go into gear, slips when hot, or drips ATF at the bellhousing, a worn pump is one of the first things to check. It is listed as a replacement for part numbers 2202770320, 1402770220, 1402700197 and 7222700197, comes as a complete cast aluminum assembly with a painted finish, and ships at 4.62 lb.
The 722.6 was the first fully electronic Mercedes automatic, and its valve body and solenoids rely on a steady supply of oil from this pump. The pump sits at the front of the case behind the torque converter, and the converter hub turns it whenever the engine runs. It feeds working pressure to the shift valves, charges the converter and lockup clutch, and pushes fluid through the cooler. The pump body also carries the bushing the converter hub rides in, so bushing wear lets the hub move off center, which wears the front seal and starves the converter circuit. When the gears and bushing wear, pressure falls off as the fluid heats and thins, which is why a tired 722.6 often drives fine cold and misbehaves after twenty minutes.
Several of these overlap with valve body and conductor plate faults, which are common on this transmission. A solenoid or speed sensor code points at the conductor plate rather than the pump.
Set the fluid level correctly first: car level, engine running and the fluid at operating temperature, using the dipstick tool on Mercedes units. Scan for codes so electrical faults are not blamed on the pump. Then look for the hot-only pattern above, metal in the pan and wear at the converter hub. Our 722.6 pump failure symptoms guide covers the pressure and noise checks, and the 722.6 common problems guide explains the valve body wear that causes flared shifts with a healthy pump.
The listing covers the Mercedes-Benz 722.6 five-speed from 1997 on, Chrysler, Dodge and Jeep vehicles with the NAG1 or W5A580, and also lists the 722.9 seven-speed from 2004 on. Mercedes changed pump designs over the years, so compare the number on your old pump with the four part numbers above before ordering, or send us your year, model and VIN. For a 722.9 that needs the 221 277 01 20 pump, see our remanufactured 722.9 pump. Everything else for this family is on the 722 transmission parts page.
Since the pan comes off for the job, replace the filter and pan seals with the 722.6 conductor plate and filter kit, and if the clutches are burnt the 722.6 overhaul kit covers the soft parts.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for vehicles with the NAG1 / W5A580 five-speed, which is the Chrysler name for the Mercedes 722.6. Confirm by matching the number on your old pump to 2202770320, 1402770220, 1402700197 or 7222700197, or send us your year and VIN.
The listing names the 722.9 from 2004 on, and 7222700197 is one of the numbers it replaces. Mercedes used more than one pump design in the 722.9, so match your pump number first. We also stock a remanufactured 722.9 pump, part number 221 277 01 20.
Always fit a new front seal and pump O-ring, and inspect the converter hub. Most people also replace the filter and pan gasket, and the conductor plate if it has stored sensor or solenoid codes.
A worn pump loses volume as the fluid thins with heat, so pressure drops off once the transmission warms up. Worn valve body bores can cause similar hot flares, so check codes and fluid level before blaming the pump.
Mercedes 722.6 units take fluid to specification sheet 236.14, and Mercedes says it must not be mixed with other transmission oils. On Chrysler-built NAG1 vehicles, follow the fluid listed in that vehicle's service information.
