MAHLE Original Ø 68 mm Single Pulley for SPZ V-Belts (Ø 17 mm Shaft) - Part Number: 37916906120
The MAHLE Original alternator drive pulley (part number 37916906120, OEM references MGX 63KIT, MGX63KIT) is an OEM-grade solid steel single-groove pulley engineered to provide positive, balanced torque transfer on alternators installed in agricultural tractors, combines, and industrial equipment. Specifically calibrated for SPZ narrow cross-section V-belts (nominal top width 9.7 mm), it features an outside diameter (Dimension B) of 68 mm, an internal shaft bore (Dimension A) of 17 mm, a belt groove width (Dimension C) of 14 mm, and an overall height/depth (Dimension D) of 21 mm. Precision-machined to original equipment tolerances, it prevents belt slippage, lowers operational harmonic vibration, and protects alternator front bearings from premature wear.
Key Features & Engineering Advantages
- OEM MAHLE / Letrika Precision Quality: Turned to strict original equipment tolerances, ensuring true concentricity, smooth groove walls, and zero rotational runout across all engine RPMs.
- Optimized for SPZ V-Belts (9.7 mm): The groove angle and sidewall profile are calibrated for SPZ narrow V-belts, providing maximum wedging grip without bottoming out or slipping under heavy electrical alternator loads.
- High-Strength Solid Steel Construction: Machined from solid bar stock with anti-corrosive surface treatment to withstand abrasive agricultural dirt, dust, and moisture.
- Standardized Fitment (17 x 68 x 14 x 21 mm): Standard 17 mm bore with internal keyway slots directly onto rotor shafts across the MAHLE / Letrika / Iskra alternator range (IA, AAG, AAK series).
- Direct OEM Interchange: Exactly matches original Iskra/Letrika references MGX 63KIT / MGX63KIT commonly fitted on compact agricultural machinery.
Technical Specifications & Dimensions
| Commercial Part Number |
37916906120 |
| Brand / Manufacturer |
MAHLE (Letrika / Iskra range) |
| Original Equipment References (OEM) |
MGX 63KIT, MGX63KIT, 11.690.612 |
| Component Classification |
Single-groove V-belt alternator drive pulley |
| Dimension A (Rotor Shaft Bore) |
17.00 mm |
| Dimension B (Outside Diameter) |
68.00 mm |
| Dimension C (Groove Width) |
14.00 mm |
| Dimension D (Overall Depth / Thickness) |
21.00 mm |
| Drive Belt Profile Compatibility |
SPZ narrow V-belts (9.7 mm width) |
| Material |
Precision-turned high-grade solid steel |
| Primary Alternator Application |
MAHLE / Letrika / Iskra IA series alternators (e.g., 379IA0096, 37699600) and similar units with 17 mm shaft |
OEM Cross Reference Table & Applications
| Manufacturer / Brand |
Interchangeable Reference Numbers |
| MAHLE / ISKRA / LETRIKA |
MGX 63KIT, MGX63KIT, 11.690.612, 11690612 |
| Machinery Applications |
John Deere, Deutz-Fahr, Case IH, Antonio Carraro, and Fendt tractors and farm equipment fitted with Iskra/Mahle 14V 33A/35A alternators driving SPZ single V-belts |
Installation Advice & Workshop Notes: Inspect the 17 mm rotor shaft extension and Woodruff key for burrs, corrosion, or play before sliding the pulley into place. Slide the pulley fully against the inner shoulder or spacer, checking axial alignment with the crankshaft and water pump pulleys (nominal 21.0 mm depth offset). Torque the rotor shaft retaining nut to the manufacturer's specified setting using the appropriate spring washer. Re-check tension on the SPZ V-belt to avoid placing excessive radial load on the alternator front bearing.
