Cummins 3930277 — Genuine Hydraulic Pump (Power Steering) for 5.9L

MPN: 3930277  |  Also Known As: power steering pump, hydraulic pump  |  Type: OEM steering assist pump

Restore confident steering feel with a genuine Cummins hydraulic pump for 2nd-gen Ram trucks. This OE pump delivers consistent steering assist, quiet operation, and long service life when paired with clean fluid and healthy hoses/gear.

Features & Benefits

• OE-calibrated flow & pressure for factory steering effort and assist.
• Direct-fit replacement built to Cummins specifications for durability.
• Reduced noise & vibration vs. worn or low-quality reman pumps.
• Compatible with hydroboost/vacuum brake systems used on 2nd-gen applications (verify by VIN/ESN).
• Genuine Cummins quality for fit, function, and long service life.

Verified Fitment (Automotive)

Industrial/Off-Highway: Listed by Cummins as a hydraulic pump used on certain B-series Euro II and other industrial applications — verify by Engine Serial Number (ESN) before ordering.

Specifications

• Function: Engine-driven hydraulic (power steering) pump
• OE Part Number: 3930277
• Quantity Required: 1 per vehicle (sold individually)
• Shipping weight (approx.): 9–10 lb

Often Paired With

• Fresh power steering fluid (complete flush recommended)
• Pressure & return hoses (replace if aged or leaking)
• Steering gearbox (inspect for play/leaks; replace if needed)

What’s In The Box

• (1) Genuine Cummins Hydraulic Pump (3930277)
• Reservoir/hoses not included unless noted (reuse or purchase separately).

Installation Tips

• Flush the system thoroughly to remove debris/contaminants before installing the new pump.
• Use new sealing washers/O-rings as applicable; torque fasteners to spec.
• Bleed the system per service manual to prevent aeration/whine.
• Inspect the steering gearbox and hoses; a failing box can damage a new pump.

FAQ

WILL THIS FIT MY 1994–1998 5.9L 12-VALVE RAM?

Yes—3930277 is the OEM hydraulic (power steering) pump for 1994–1998 Ram 2500/3500 with the 5.9L 12-valve. Confirm by VIN/ESN if your truck has non-standard components.

IS THIS THE SAME AS A “POWER STEERING PUMP”?

Yes. Cummins catalogs it as a hydraulic pump, which is the OE power steering pump on these applications.

WHAT ABOUT 1998.5–2002 24-VALVE TRUCKS?

Those typically use a different OEM pump (commonly sold as 4919809). Order the correct pump for your model year.

DOES IT INCLUDE THE RESERVOIR?

This listing is for the pump assembly. Reservoirs/lines are reused or replaced separately depending on configuration.

HOW CAN I PREVENT PUMP NOISE OR PREMATURE FAILURE?

Flush the system, use correct fluid, bleed air thoroughly, and replace worn hoses/gearbox to keep inlet pressure stable.