Cummins engine spare parts Belt tensioning wheel C5287020

Equipped with a high-torque spiral torsion spring (rated at 15 N·m) and a precision-machined pivot arm, the tensioning wheel provides automatic, constant tension to the accessory belt—maintaining optimal tension (250–300 N for Cummins ISB6.7 engines) even as the belt stretches over time or experiences temperature-induced expansion. The torsion spring’s torque is calibrated to compensate for belt wear (up to 5% elongation), preventing slack that causes belt slippage (a major source of reduced alternator output and water pump efficiency). The pivot arm features a low-friction bushing (PTFE-lined, wear resistance ≥5,000 hours) that allows smooth rotation during tension adjustments, ensuring the tensioner responds instantly to belt load changes (e.g., sudden alternator demand during heavy electrical use). Compared to manual-adjust tensioners, this automatic design reduces belt replacement frequency by 40% and maintains accessory drive efficiency at ≥95%

Engineered to withstand the harsh conditions of engine accessory drives—constant rotation (up to 3,000 RPM), vibration, and temperature fluctuations (from -40°C to 120°C)—the tensioning wheel features a robust, long-lasting design:

Pulley: Die-cast aluminum alloy pulley (ADC12 grade) with a hard-anodized surface (thickness 15μm) that resists wear and corrosion, ensuring a smooth belt contact surface (Ra ≤0.8μm) for over 150,000 km.

Bearing: Sealed double-row ball bearing (SKF 6203 model) with a rated life of 50,000 hours—resisting oil contamination and vibration (tested to 20g acceleration at 10–2000Hz) and requiring no maintenance.

Spring: Chrome-silicon alloy steel spring (heat-treated to 45–50 HRC) that retains 95% of its torque after 10,000 tension cycles, preventing spring fatigue-induced tension loss.

These components work together to extend the tensioner’s service life to 200,000 km, matching the maintenance intervals of Cummins engines

The tensioning wheel is designed to minimize noise and vibration in the accessory drive system—critical for driver comfort and component longevity:

Pulley Groove Design: The pulley’s 30° V-groove (machined to ISO 4183 standards) ensures full contact with the belt’s ribs, reducing belt chatter and noise to ≤65 dB (measured at the engine front cover).

Vibration Absorption: The pivot arm’s PTFE bushing acts as a vibration damper, absorbing high-frequency vibrations (above 1,000 Hz) that could cause belt resonance or bearing damage.

Balanced Rotation: The pulley is dynamically balanced to G2.5 accuracy (per ISO 1940), ensuring smooth rotation at high speeds (3,000 RPM) with minimal wobble—reducing bearing stress and noise.

This low-noise design makes the tensioner suitable for applications where noise levels are regulated, such as urban delivery trucks and school buses

Designed for efficient replacement by fleet technicians, the tensioning wheel simplifies installation and reduces downtime with user-friendly details:

Pre-Assembled Components: The tensioner comes fully assembled (pulley, bearing, spring, pivot arm) with pre-installed mounting bolts (M10×25mm, zinc-plated for rust resistance)—no separate part assembly required.

Clear Tension Indicators: A laser-etched tension mark on the pivot arm aligns with a reference line on the mounting flange, allowing technicians to verify correct initial tension in seconds (no specialized tools needed).

Standard Tools Compatibility: Uses common 13mm and 15mm sockets for mounting and tension adjustment, eliminating the need for proprietary tools (torque specification: 35 N·m for mounting bolts).

Installation takes 20–25 minutes: loosen the accessory belt, remove the old tensioner’s mounting bolts, position the new tensioner (aligning the tension mark), torque the bolts, and retighten the belt. Each unit undergoes dimensional inspection via CMM (Coordinate Measuring Machine), bearing rotation testing, and tension calibration, backed by a 24-month OEM warranty against defects (e.g., bearing failure, spring fatigue, pulley wear)