MAHLE Clockwise Alternator Cooling Fan / Flywheel (Ø 135 mm) for Agricultural Machinery - Part Number: 37915900726
The genuine MAHLE centrifugal alternator cooling fan / flywheel (part number 37915900726, manufacturer and OEM references 133875, MGX 398, MGX398) is an OEM-grade precision metal component engineered to deliver positive forced cooling across agricultural and industrial electrical generator sets. Configured for clockwise rotation (CW / ↻), its radial vanes are aerodynamically contoured to draw air through the alternator, dissipating heat from the internal diode bridge, stator coils, and electronic voltage regulator. Built from stamped high-tensile sheet steel resistant to centrifugal deflection, it features an internal shaft bore (A) of 17 mm, an overall outside diameter (B) of 135 mm, and an axial height/thickness (C) of 14 mm. It ensures dependable thermal stability on heavy-duty MAHLE / Iskra / Letrika alternators operating under sustained high-load field conditions.
Key Features & Engineering Advantages
- Calibrated Clockwise Aerodynamic Blade Profile: Vane geometry is designed specifically for clockwise rotation to optimize CFM airflow delivery through the housing, significantly lowering internal operating temperatures.
- Precision Ø 17 mm Shaft Center Bore: 17 mm center hole with 14 mm axial depth seats flat and concentric against the rotor shoulder and drive pulley without mechanical runout.
- OEM-Level Rotational Balancing: Dynamically balanced during production to prevent harmonic vibrations and premature fatigue on the alternator drive-end ball bearings at elevated engine speeds.
- High-Strength Stamped Steel Construction: Rigid single-piece design provides high fatigue resistance against airborne field dust, crop chaff, and harsh vibration.
- Full MAHLE / Iskra Alternator Compatibility: Matches factory specifications MGX398 / 133875 for seamless rebuilding and servicing of heavy-duty charging equipment.
Technical Specifications & Dimensions
| Commercial Part Number |
37915900726 |
| Manufacturer / Quality Brand |
MAHLE (Iskra / Letrika) |
| OEM / Manufacturer References |
133875, MGX 398, MGX398 |
| Component Classification |
External alternator cooling fan / flywheel |
| Direction of Rotation |
Clockwise (↻ / CW) |
| Dimension A (Shaft Bore Diameter) |
17 mm |
| Dimension B (Outside Diameter) |
135 mm |
| Dimension C (Axial Height / Thickness) |
14 mm |
| Material Specification |
Precision-stamped sheet steel with anti-corrosive coating |
| Primary Function |
Forced-air thermal management for agricultural and industrial alternators |
Alternator Compatibility & Equipment Guide
| Application Category |
Compatible Alternators & Tractor Series |
| Primary Alternators |
MAHLE / Iskra / Letrika 14V clockwise alternators with 17 mm shaft (including 379IA0499, MG 604, 3760010056, and related IA series) |
| Antonio Carraro Tractors |
Series 300, 400, 500, 600, 700, 9000, 9800 tractors fitted with clockwise MAHLE charging alternators |
| Case IH Tractors |
B-Familie (644, 744, 844, 856 XL), C-Familie (955, 1056 XL), CS and Compact series with clockwise alternators |
| Deutz-Fahr Tractors |
Series D 06, D 07, DX, DX 3, DX 4, AgroPrima, AgroStar, AgroXtra using IA series alternators with 135 mm fan |
| John Deere Equipment |
Series 20, 30, 40, 50 and combine harvesters specifying MAHLE/Iskra external clockwise cooling fans |
Installation Advice & Workshop Notes: Always disconnect the battery ground cable before beginning work. Remove the drive belt and unbolt the pulley nut. Thoroughly clean the 17 mm rotor shaft to ensure the fan seats squarely against the rotor shaft shoulder. Slide the new fan into position with the vane curvature orientated toward the alternator housing, verifying that the 14 mm axial thickness rests flat without touching the front bearing retainer. Install the pulley and torque the center nut to factory specifications while holding the rotor shaft steady. Manually spin the alternator to verify that the 135 mm outer diameter has full clearance with engine brackets or belt guards before reinstalling and tensioning the drive belt.
