E4‑12 Adjusting Pulley 1B Groove Double Bearing Bus AC Belt Tension Pulley

E4‑12 adjusting pulley with 1B groove and double‑bearing structure, complete tension pulley assembly specially designed for bus air‑conditioning belt drive system. Mounted on engine bracket, it can fine‑tune belt tension by adjusting bolt. Proper belt tension avoids slipping, abnormal squeal and excessive vibration, ensures reliable power delivery from engine to air‑conditioning compressor.

Equipped with two built‑in high‑precision bearings, compared with single‑bearing pulleys, it can bear bigger radial load, deliver smoother rotation, resist continuous vibration generated during bus driving. Black anti‑corrosion coating enhances durability against dust, rain splash and road grime. Complete assembly includes pulley body, bearings, adjusting bolt and locking hardware for direct installation.