AW55-50SN Pump 2000, remanufactured and ready to install. Fits the AW55-50SN. Ships fast from the USA.
A Volvo S60, V70 or XC90, a Saab 9-3 or 9-5, or a Saturn Vue with the Aisin five-speed that is slow to engage, slips once hot, or runs low on lube and cooler flow may need its front pump assembly. This complete pump assembly is for the AW55-50SN family, built from 2000 on, and is listed to cover the AW55-51SN and the AF23 and AF33 versions GM used. It has been disassembled, cleaned, inspected and reassembled, and it comes with a new pump seal, a new pump bushing and a new pump O-ring already installed. The clutch plates that ride in the assembly are the original used plates.
The pump is driven by the converter hub and feeds the primary and secondary regulators that set line, converter and lube pressure for the whole transaxle. This pump uses a gear set, an outer gear with 11 teeth around an inner gear with 9 teeth. The pump bushing matters more here than in many units: Sonnax points out that the AW55 converter relies on several valves together with the rear pump bushing to control modulated converter clutch apply, so a worn bushing can show up as converter clutch complaints as well as a leak.
Most AW55-50SN trouble starts in the valve body, so P0750-P0770 series shift solenoid performance codes are more often a bore wear problem than a pump problem. The pump is the cause when pressure is low everywhere.
Check fluid level first; Sonnax notes that both low fluid and overfill create erratic pressure and poor linear solenoid control. Then test at the pressure taps, which use a 12 mm plug head. Sufficient pressure hot means the filter, pump and both regulators are working. Lube pressure that starts low and stays at zero points to low pump output, a worn regulator bore or bad bushings. Our AW55-50SN service guide covers the valve body wear to rule out, and Aisin slipping under load walks through pressure diagnosis.
This pump is listed for 2000-up AW55-50SN, AW55-51SN, AF23 and AF33 transaxles. These units went into Volvo, Saab, GM (Saturn Vue, Chevrolet Malibu and Opel), Nissan and other brands, and internal details changed over time. Compare the pump, its bolt pattern and stator spline to the one you remove, or send us your year and VIN. Other parts for this family are on the Aisin collection page, along with the AW55-50SN pump listing without a year range.
| Fits | AW55-50SN 2000 |
| Part type | Pump |
| Condition | Remanufactured |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is listed for 2000-up AW55-50SN, AW55-51SN, AF23 and AF33 units. Details varied by brand and year, so compare it with your old pump or send us your VIN before ordering.
A new pump seal, a new pump bushing and a new pump O-ring. The pump has been cleaned, inspected and reassembled, and the clutch plates in the assembly are original used plates.
Gauge test it hot. Good pressure at operating temperature means the pump and regulators are working. Lube pressure that stays at zero points to low pump output, a worn regulator bore or worn bushings.
Yes. The AW55 converter uses several valves along with the pump bushing to control modulated lockup, so a worn bushing can upset converter clutch control.
Match the vehicle label. Volvo and Saab applications call for JWS 3309 or AW-1 type fluid by part number, while GM-branded units take Dexron VI.
