Product Description
Cummins 3914707 — Vacuum Pump to P/S Pump Jaw Coupling Hub
MPN: 3914707 | Also Known As: jaw coupling hub, vacuum pump coupling, power steering pump coupler
Why This Part
- ✓ OE coupling hub that transfers drive from the vacuum pump to the power steering pump.
- ✓ Direct-fit for 1994–2002 Ram 5.9L (12V & 24V) — verify by VIN/ESN.
- ✓ Restores assist & reliability if the original hub is worn, noisy, or failed.
- ✓ Durable OE materials and geometry for long service life.
Quick Specs
| Type | Jaw coupling hub (vacuum pump → power steering pump) |
|---|---|
| OE Part # | 3914707 |
| Qty Required | 1 per vacuum/PS pump assembly (sold individually) |
| Usage | Primarily B-Series 5.9L (Tier 2 era); confirm by VIN/ESN |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L Cummins (12-Valve) | Ram 2500/3500 |
| 1998.5–2002 | 5.9L Cummins (24-Valve VP44) | Ram 2500/3500 |
Notes: Many listings show 1989–2002 coverage; some early builds differ. Always confirm by VIN/ESN and component style before ordering.
Often Paired With
- Vacuum pump oil supply line: 3934396 (’94–’02)
- Vacuum pump gasket/seals: 3938655 and related hardware
- Related fittings: 3924346 tee (vacuum/injection pump)
What’s In The Box
- (1) Genuine Cummins Jaw Coupling Hub (3914707)
- Gaskets/lines sold separately (see “Often Paired With”).
Install Tips
- Inspect mating hubs for wear; align components carefully.
- Follow Cummins service procedure and torque guidance.
- After assembly, check for abnormal noise and verify steering assist.
FAQ
WILL THIS FIT MY 1994–2002 5.9L CUMMINS RAM?Yes—this OE hub couples the vacuum pump to the power steering pump on most 1994–2002 Ram 2500/3500 5.9L applications (verify by VIN/ESN).
WHAT ABOUT 1989–1993 TRUCKS?Some sources list 1989–1993 coverage, but early assemblies may differ. Confirm component style by VIN/ESN before ordering.
WHAT SYMPTOMS POINT TO A FAILED HUB?Loss of power-steering assist, vibration/noise from the vacuum/PS pump area, or visible hub damage during service.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3914707 for proper fit and durability.
DO I NEED OTHER PARTS WHEN REPLACING THIS?It’s smart to inspect/replace the vacuum pump gasket, oil supply line, and related fittings if wear or leaks are present.
