AZ9231320031 Howo Medium Speed Reducer

AZ9231320031 is a medium-speed reducer for Sinotruk HOWO A7/T7H/TH7 trucks. As a core power transmission component, it adjusts speed, amplifies torque, and distributes engine power to the drive axle, ensuring strong traction for starting, climbing, and heavy-duty loading.

We have supplied this part to more than 30 repair shops and fleets over the past five years. Users report stable performance: no abnormal noise, no oil leakage, no gear wear, and no torque loss.

It features precision gears made of 20CrMnTi alloy steel (carburized and quenched) and a ductile iron housing (QT500-7). The internal bearings are high-temperature resistant, and the sealing rings are made of nitrile rubber. It performs reliably under heavy loads, operating temperatures from -30℃ to 140℃, high-speed rotation, and vibration without failure.

With a transmission ratio of 3.73 that fully matches original equipment specifications, it improves fuel economy by up to 15%. It fits HOWO's original drive axle and bracket perfectly: simply remove the old reducer and install directly with no modifications required. Each unit is tested for transmission efficiency, torque capacity, and service life to ensure consistent reliability.

① Precision transmission: High-precision gears + 3.73 ratio = sufficient traction for heavy loading and climbing.

② Durable: Ductile iron housing + wear-resistant gears = ≥8 years service life.

③ Efficient & energy-saving: ≥96% transmission efficiency, saves fuel.

④ Fits HOWO fast: Mounting and transmission parameters match original, easy to install, saves time.

Only Sinotruk HOWO A7/T7H/TH7 (power transmission system). No old HOWO A3, FAW J6, SHACMAN-different specs cause safety risks.

Product Model: AZ9231320031

Fits vehicles: Sinotruk HOWO A7, T7H, TH7 trucks

Function: Adjusts speed; increases torque; distributes power to drive axle

Material: Gears (20CrMnTi alloy steel); housing (ductile iron); bearing (high-temperature resistant); sealing ring (nitrile rubber)

Installation: Direct replacement-fits original HOWO drive axle and bracket

Working conditions: -30℃ to 140℃; ≤2800N·m torque; ≤2800r/min input speed

Key specs: Transmission ratio 3.73; efficiency ≥96%; gear precision grade 6; 380×320×260mm dimensions

Q1: Fits old HOWO A3, FAW J6, or SHACMAN?

A1: No, only A7/T7H/TH7.

Q2: Abnormal noise, oil leakage, or insufficient power?

A2: Check bolt torque first, then sealing ring or gear oil. 

Q3: How to maintain?

A3: Inspect every 50,000km; replace gear oil every 100,000km; replace reducer every 8 years.

Q4: Tools for install?

A4: Torque wrench + hoisting tool. Pro maintenance needed; takes 2-3 hours.

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