Clutch Slave Cylinder Assembly

The OE part number is WG9725230042. This Clutch Booster (Clutch Slave Cylinder) is the core pneumatic control component of heavy‑duty truck clutch system. It assists clutch separation and combination through air pressure boosting, effectively reducing the stepping force of the clutch pedal and realizing smooth, flexible and accurate clutch control. It effectively solves common clutch system faults caused by aging, internal valve failure and sealing aging of old boosters, such as heavy clutch pedal, unsmooth gear shifting, clutch separation incompleteness, slow clutch response, air leakage and oil leakage. It adopts high‑strength aluminum alloy shell, built‑in precision piston assembly and multi‑layer high‑tightness sealing components. It maintains stable pneumatic boosting performance and sensitive working feedback under long‑term frequent clutch operation and complex road vibration. Factory‑calibrated overall dimensions, air ports and mounting hole positions support direct plug‑and‑play installation, keeping stable working state without jamming or pressure loss during long‑distance heavy‑load transportation.

① Applicable vehicle models Suitable for Sinotruk HOWO A7, T7H series heavy trucks and SITRAK C7H heavy‑duty vehicles, including logistics tractors, bulk cargo transport vehicles and engineering dump trucks. Widely applied for after‑sales maintenance, fleet overhaul and spare parts stocking projects.

② Adaptation System Belongs to HOWO Clutch System, sub‑category of clutch pneumatic control parts. Precisely matches original clutch pedal mechanism, gearbox clutch execution structure and vehicle air circuit system. Fits installation position perfectly without drilling, cutting or any modification to vehicle structure. No extra debugging needed, ready for direct installation after replacement.

③ Original Factory Reference Number Corresponding OE Number: WG9725230042. All products are strictly manufactured according to original factory drawing data and mold standards, achieving full dimensional consistency and 100% accurate interchangeability with genuine OEM clutch booster.

④ Interchangeability Produced fully complying with OEM dimensional and performance criteria. Core parameters including overall installation size, piston stroke, air pressure bearing capacity, sealing tightness and working sensitivity are completely consistent with original spare parts. It can directly replace the factory clutch booster assembly, greatly shortening on‑site maintenance debugging time and cutting labor service costs.

⑤ Additional Services We provide professional compatibility verification based on customers' vehicle model, chassis configuration and actual clutch failure phenomenon. Meanwhile, detailed disassembly & assembly operation guidance and matching clutch system accessory recommendation lists are available. Our technical team offers full‑process installation support to avoid heavy clutch pedal, slow response and air leakage faults triggered by mismatched spare parts or non‑standard installation.

The booster shell adopts high‑strength precision cast aluminum alloy, with light weight, high pressure resistance and impact resistance, adapting to long‑term pneumatic pressure working environment and chassis vibration. The internal piston and push rod are made of high‑precision wear‑resistant alloy materials, with smooth reciprocating movement and no jamming. Multi‑layer sealing rings adopt high‑quality oil‑resistant and aging‑resistant rubber materials, which can effectively resist frequent stretching and friction, maintain stable sealing performance for a long time, and prevent air and oil leakage. The built‑in reset spring is made of high‑carbon spring steel with stable elasticity, ensuring accurate and rapid reset after each clutch operation. The whole unit has excellent adaptability to heavy‑truck harsh working conditions, resisting erosion of dust, muddy water and oil stains.

The aluminum alloy shell surface adopts anti‑oxidation and anti‑corrosion treatment, effectively isolating erosion from external moisture, dust and muddy water to prevent surface oxidation and rusting. The internal air channel and piston working surface are precision polished to ensure smooth air circulation and flexible piston movement. The sealing contact surface is finely processed to improve fitting tightness and avoid slow pressure leakage. The mounting surface is flat and deburred to ensure stable installation and firm fitting. All metal moving parts are coated with anti‑wear lubricating grease to reduce friction loss and improve operation sensitivity.

Aluminum alloy shell casting, internal precision parts processing and sealing assembly are completed by advanced fully automatic CNC production equipment. Core processing procedures are finished in a constant‑temperature dust‑free workshop to eliminate internal casting stress of the workpiece and avoid later deformation and jamming during vehicle operation. Key indicators such as overall dimension tolerance, pneumatic pressure bearing capacity, sealing performance, piston stroke accuracy and working sensitivity are inspected piece by piece with professional precision testing equipment. All finished products pass 100% full inspection before delivery, covering appearance defect detection, static and dynamic air tightness test, high‑frequency reciprocating fatigue test and durability test. Each batch of goods is screened per OEM standards to fully meet frequent clutch operation and long‑service‑life requirements of HOWO and SITRAK heavy truck clutch system.

We are equipped with professional aluminum alloy casting production lines and complete pneumatic parts performance testing equipment, with mature standardized stable production processes. Sufficient monthly output and abundant finished product stock can fully support batch wholesale, spot delivery and global export orders. We also provide customized services including OEM part number marking, neutral export packaging and special surface process treatment, as well as sample trial production. We fully satisfy personalized procurement and matching demands of global auto parts distributors, repair shops and fleet purchasers.

Q: Compared with ordinary aftermarket clutch boosters, what core advantages does this WG9725230042 clutch booster have?​
A: It is manufactured strictly following OEM standards with high‑precision piston matching, pressure‑resistant aluminum alloy shell and multi‑layer anti‑leakage sealing structure. It adapts to frequent clutch stepping and harsh working conditions of HOWO A7/T7H and SITRAK C7H heavy trucks, effectively avoiding clutch heavy pedal, slow response, air leakage and incomplete separation, providing long‑term stable pneumatic assist guarantee for the vehicle clutch system.​
Q: Is the product quality reliable? What is its service life?​
A: All products are produced in accordance with original factory technical specifications and pass multiple rounds of pneumatic pressure and high‑frequency fatigue tests. Under standard normal driving and maintenance conditions, its service life reaches 3–5 years. It is specially customized for heavy trucks, engineering vehicles and long‑distance logistics transportation, with stable quality and outstanding cost performance.​
Q: What practical benefits can replacement with this clutch booster bring?​
A: It completely restores the original sensitive and labor‑saving clutch performance of the vehicle, solves typical faults including heavy clutch pedal, difficult gear shifting, incomplete clutch separation and pneumatic leakage. It ensures smooth clutch combination and separation during daily driving, improves driving operation comfort and transportation safety. It avoids frequent repeated maintenance and high replacement costs caused by clutch system failure, effectively reducing overall vehicle operation and maintenance expenses.

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