Product Description
CUMMINS 3914707 OEM VACUUM PUMP TO POWER STEERING PUMP JAW COUPLING HUB – RAM 5.9L (1994–2002)
The CUMMINS 3914707 OEM jaw coupling hub is the factory-correct connector that mates the vacuum pump to the power steering pump on 1994–2002 Dodge Ram trucks equipped with the 5.9L Cummins engine. This hub is a critical component of the front engine accessory drive system, ensuring proper alignment, smooth rotation, and reliable transfer of mechanical drive between the two pumps.
Over time, the original hub can wear, crack, or develop excessive play—leading to power steering loss, vacuum system failure, noise, or pump damage. Replacing it with a genuine Cummins coupling hub guarantees the correct metallurgy, spline engagement, and jaw alignment for long-term durability and smooth operation.
Key Features
- Genuine Cummins OEM hub – correct spline geometry and coupling dimensions.
- Connects the vacuum pump to the power steering pump on 5.9L Cummins engines.
- Prevents misalignment and vibration that damage pumps.
- Heat-treated construction for maximum durability.
- Direct bolt-in replacement for worn or damaged coupling hubs.
Fitment Details
- Engine: 5.9L Cummins (12-Valve & 24-Valve)
- Years: 1994–2002
- Vehicles: Dodge Ram 2500 / 3500
- Function: Mechanical jaw coupling from vacuum pump to power steering pump
- Notes: Failure of this hub can cause sudden loss of power steering assist or vacuum for HVAC and brakes.
Cross-Reference & Companion Cummins Parts
CPP Diesel carries matching OEM components commonly replaced during vacuum/power steering pump service:
- CUMMINS 3931593 VACUUM PUMP GASKET – 5.9L
- CUMMINS 3933978 POWER STEERING PUMP GASKET – 5.9L
- CUMMINS 3937121 POWER STEERING PUMP MOUNTING SEAL – 5.9L
- VIEW ALL GENUINE CUMMINS PARTS
Common Cummins cross references: 3914707, 3906697, 3935851 (verify by VIN/ESN).
Installation Notes
- Inspect both the vacuum pump and power steering pump jaws for wear.
- Ensure both pumps are aligned before tightening fasteners.
- A failing coupler may mimic pump failure—inspect before replacing pumps.
- Replace gaskets and O-rings during pump servicing for best results.
Specifications for cummins 3914707
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3914707 |
| Alternate / Cross Reference | 3906697, 3935851 (verify by VIN/ESN) |
| Function | Jaw coupling hub between vacuum pump and power steering pump |
| Engine Compatibility | 5.9L Cummins 12-Valve & 24-Valve (1994–2002) |
| Vehicle Fitment | 1994–2002 Dodge Ram 2500 / 3500 |
| UPC | 190910244917 |
| GTIN | 190910244917 |
| Shipping Weight | Approx. 0.75 lbs |
| Shipping Method | Standard ground; expedited available |
| E-Codes / Emissions | Not emissions-related |
| Prop 65 Warning | WARNING: This product may expose you to chemicals known to the State of California to cause cancer and reproductive harm. Visit www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
WHAT DOES THIS COUPLING HUB DO?
It mechanically links the vacuum pump to the power steering pump, allowing both to operate off the same drive source.
WHAT ARE THE SYMPTOMS OF A FAILING COUPLER?
Common symptoms include vibration, noise, intermittent power steering assist, vacuum loss, or metal debris inside the coupling.
CAN THIS CAUSE POWER STEERING FAILURE?
Yes. A worn or broken coupling hub can cause sudden loss of power steering assist and/or vacuum function.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel supplies only authentic Cummins OEM components for maximum reliability.
