MAHLE Ø 68 mm Single-Groove Pulley for SPZ V-Belts with Mounting Kit for Alternators - Part Number: 37916906308
The genuine MAHLE single-groove alternator drive pulley assembly with mounting kit (part number 37916906308, manufacturer references MGX 674KIT, MGX674KIT) is an OEM-grade precision transmission component designed for heavy-duty belt-driven agricultural and industrial alternators from the MAHLE / Iskra / Letrika range (specifically matching the 14 V / 65 A compact series such as 379IA0499 / MG 604). Manufactured from wear-resistant high-strength steel, it features an outside diameter (B) of 68 mm tailored for SPZ narrow cross-section V-belts (and compatible 9.7 mm profiles). Built with an internal shaft bore (A) of 17 mm, overall width/thickness (C) of 14 mm, and a backset/distance (D) of 20.9 mm, it ensures precise belt tracking, prevents dynamic belt slippage, and eliminates lateral runout across demanding field operations.
Key Features & Engineering Advantages
- MAHLE OEM Precision Balancing: Machined to strict concentricity tolerances to ensure zero radial and axial runout, protecting front alternator ball bearings from harmful vibrational loads.
- SPZ / 9.7 mm Precision V-Groove Profile: Optimized groove depth and taper angle designed for maximum side-wall traction on narrow SPZ V-belts, reducing belt heating, slippage, and power losses under heavy charging demands.
- Complete Installation Hardware Kit Included (KIT Execution): Supplied with dedicated mounting hardware required for positive, slip-free seating onto the 17 mm rotor shaft.
- High-Strength Fatigue-Resistant Steel: Treated against surface wear caused by fine airborne soil, crop dust, and environmental exposure typical of tractors and harvesting machinery.
- Accurate 20.9 mm Offset Spacing: Preserves exact belt centerline alignment relative to the engine crankshaft pulley and auxiliary belt routing.
Technical Specifications & Dimensions
| Commercial Part Number |
37916906308 |
| Manufacturer / Quality Brand |
MAHLE (Iskra / Letrika) |
| OEM / Kit Reference Codes |
MGX 674KIT, MGX674KIT |
| Component Classification |
Alternator single V-belt drive pulley assembly with mounting accessories |
| Dimension A (Shaft Bore Diameter) |
17 mm |
| Dimension B (Pulley Outside Diameter) |
68 mm |
| Dimension C (Overall Pulley Thickness/Width) |
14 mm |
| Dimension D (Pulley Offset / Backset) |
20.9 mm |
| Compatible Belt Profiles |
SPZ profile V-belts (9.7 mm narrow-section / AVX 10) |
| Material Specification |
Precision-machined high-grade steel with anti-corrosive coating |
Alternator Compatibility & Equipment Guide
| Application Category |
Compatible Alternators & Tractor Applications |
| Primary Alternators |
MAHLE / Iskra IA series 14V alternators (notably 379IA0499 / MG 604 / 11.201.499 with 17 mm rotor shaft and 20.9 mm offset) |
| Antonio Carraro Tractors |
Series 300, 352, 400, 452, 500, 552, 600, 652, 700, 9000, 9800 compact and orchard tractors fitted with MAHLE alternators |
| Case IH Tractors |
B-Familie (644, 744, 844, 856 XL), C-Familie (955, 956, 1055, 1056 XL), CS and Compact series running SPZ 9.7 mm V-belts |
| Deutz-Fahr Tractors |
Series D 06, D 07, DX, DX 3, DX 4, AgroPrima, AgroStar, AgroXtra using single-groove 68 mm alternator pulleys |
| John Deere Equipment |
Series 20, 30, 40, 50 (e.g., 1040, 1140, 1640, 2040, 2140) configured with single V-belt alternator drives |
Installation Advice & Workshop Notes: Always disconnect the vehicle battery before servicing the alternator belt drive. Thoroughly clean the 17 mm rotor shaft extension, removing any burrs, rust, or debris. Slide the pulley onto the shaft and verify that the specified 20.9 mm offset dimension is achieved without binding against the alternator front housing. Hold the rotor shaft securely using an internal hex key or specialized rotor lock tool and torque the retaining nut to the MAHLE recommended specification (approximately 50–60 Nm); never grip the pulley flanks with pliers or clamps, as this will score the contact face and damage the belt. Once bolted in place, re-tension the SPZ drive belt to manufacturer specifications.
