Cummins K38 K50 Diesel Engine Parts 3069776 Crankshaft Adapter Stock Manufacturing Plants Retail Industries

The Cummins Crankshaft Adapter 3069776 is an OEM-grade component engineered for K38 (38L, 1,300–2,100 hp) and K50 (50L, 2,200–3,500 hp) diesel engines in mining, marine, and power generation applications. As the mechanical bridge between the crankshaft and accessory drive systems-including alternators, water pumps, and hydraulic pumps-it ensures 100% power transmission efficiency under extreme conditions, including 1,800 N·m torque and operating temperatures up to 120°C. Constructed from heat-treated ductile iron (ASTM A536-84) with a plasma-sprayed molybdenum disulfide (MoS₂) coating, it withstands 10 million fatigue cycles (ISO 6336) and 1,000 hours of salt spray (ASTM B117), tripling the service life of aftermarket adapters.

Material Science Breakthroughs

- Base Material: Ductile iron (HRC 20–25) with 550 MPa tensile strength, resisting 99.7% of abrasive wear in mining environments.

- Surface Treatment: Plasma-sprayed MoS₂ coating reduces friction to μ ≤ 0.08 under 800 MPa contact stress, ensuring smooth power transfer.

*Tested Performance*: <0.02 mm material loss after 1,000-hour sand abrasion testing.

Precision-Machined Geometry

- Laser-cut splines ensure 99.9% alignment accuracy with K38/K50 crankshafts.

- 3D-printed indexing tabs enable 0.01 mm installation precision.

- 25 mm radial hub thickness resists 1,800 N·m torsional stress.

OE-Level Integration

- Direct fit for K38 (2017+) and K50 (2018+) engines-no modifications required.

- Tool-free replacement enables 30-minute service time.

Part Number : 3069776 (Rev P, 2025 formulation)

Compatibility : Cummins K38/K50 engines

Operating Torque : 1,500–1,800 N·m (continuous) / 2,200 N·m (peak)

Thermal Range : -40°C to 120°C (-40°F to 248°F)

Dimensions : φ280 mm OD × φ85 mm ID × 60 mm thickness

Weight : 12.5 kg (27.55 lbs)

Certified Service Life : 20,000-hour bench test (equivalent to 40,000 operational hours)

Cleanliness : ISO 4406 16/14/12 (pre-installation)

Installation (Critical Steps):

1. Surface Preparation: Use Cummins cleaner P/N 4922469 to achieve a 0.8 µm Ra finish on the crankshaft hub.

2. Torque Sequence: Apply 220 ± 5 N·m (162 ft-lb) in three incremental steps using Cummins tool JH42879.

3. Alignment Verification: Confirm 0.02 mm radial runout using a dial indicator.

Maintenance Schedule:

- Every 1,000 Hours: Inspect for spline wear (replace if depth loss exceeds 1.5 mm).

- Every 5,000 Hours: Perform ultrasonic thickness testing (minimum acceptable thickness: 58 mm).

- Lubrication: Use Cummins TITAN 15W-40 (P/N 4922385) for optimal seating.

*Pro Tip*: Pair with Cummins Belt Set 3024614 for optimal power transmission.