Product Description
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)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L Cummins 12-Valve (P7100) | Ram 2500/3500 |
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.
Compatibility Notes:
- Applies to 1994–1998 5.9L 12-valve. For 1998.5–2002 24-valve trucks, use the later OEM pump (commonly sold as 4919809).
- Reservoir/line routing varies by brake system (vacuum vs. hydroboost). Reuse or replace components as required.
- Always confirm fitment by VIN/ESN when mixing industrial and on-highway parts.
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.
