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Effortless clutch actuation and reduced driver fatigue – The OEM WG9719230023GKC110 Clutch Booster Cylinder is a pneumatic‑over‑hydraulic unit designed to multiply the force from the clutch pedal, providing smooth and precise clutch disengagement on SINOTRUK HOWO, SHACMAN, and other heavy commercial vehicles. It significantly reduces pedal effort, especially in stop‑and‑go traffic.
This integrated booster combines an air chamber and a hydraulic master cylinder, converting low‑pressure air into high‑pressure hydraulic output. For guaranteed compatibility and reliable clutch performance, always choose genuine Sinotruk Homan parts.
The WG9719230023GKC110 Clutch Booster Cylinder features a corrosion‑resistant aluminum body, a stainless steel piston rod, and high‑temperature seals. It delivers consistent output pressure proportional to the air input, ensuring smooth clutch engagement and longer clutch life.
The WG9719230023GKC110 Clutch Booster Cylinder operates on the principle of air‑over‑hydraulic amplification. A small clutch pedal stroke opens an air control valve, admitting compressed air (typically 6‑8 bar) into the booster’s air chamber. This air acts on a large piston, which in turn pushes hydraulic fluid at up to 120 bar into the clutch slave cylinder. The result is a light pedal feel with high output force.
The booster includes a built‑in pushrod adjustment mechanism, allowing fine tuning of the clutch release point without special tools. The aluminum housing is anodized and painted, resisting corrosion from road salt and underbody chemicals. All seals are manufactured from high‑grade EPDM or FKM rubber, compatible with DOT 3, DOT 4, and mineral‑based hydraulic fluids.
Fleets using the WG9719230023GKC110 have reported a 50% reduction in clutch pedal effort and a 30% decrease in clutch system failures due to improved actuation consistency. The booster also reduces wear on the clutch release bearing by providing full disengagement on every stroke.
Uses vehicle air supply (7‑8 bar) to generate hydraulic pressure up to 120 bar, reducing pedal force by up to 70%.
Anodized aluminum body plus painted exterior. Zinc‑plated pushrod. Withstands road salt and chemical exposure.
Adjustable pushrod and built‑in return spring. Provides progressive and repeatable clutch feel.
| OEM Number | WG9719230023GKC110 |
| Product Name | Clutch Booster Cylinder (Pneumatic‑Over‑Hydraulic) |
| Brand | SINOTRUK Homan |
| Type | Air assisted, single acting, push‑type |
| Air Supply Pressure Range | 6 – 9 bar (87 – 130 psi) |
| Max Hydraulic Output Pressure | 120 bar (1,740 psi) |
| Hydraulic Displacement | 25 cm³ (0.025 L) per full stroke |
| Air Chamber Diameter (effective) | 90 mm |
| Hydraulic Bore Diameter | 25.4 mm (1 inch) |
| Pushrod Adjustment Thread | M12 x 1.25 (adjustable length ±15 mm) |
| Fluid Type | DOT 3, DOT 4, or mineral clutch fluid |
| Operating Temperature | -40°C to +100°C |
| Seal Material | EPDM (brake fluid) or FKM (mineral oil) depending on fluid spec |
| Housing Material | Die‑cast aluminum (A380) with e‑coat + black powder paint |
| Connections | Air inlet: M12x1.5; Hydraulic outlet: M10x1; Pushrod: M12x1.25 |
| Standards Met | ISO 1702, OEM ZF / WABCO specifications, ECE R13 |
The WG9719230023GKC110 is a precision‑machined assembly consisting of four main parts: an air control valve, a pneumatic piston, a hydraulic master cylinder, and a return spring. When the clutch pedal is depressed, a mechanical linkage opens the air valve, admitting compressed air behind the large‑diameter air piston. The force generated on this piston is transmitted directly to the hydraulic piston, pressurizing the fluid.
The ratio of air piston area to hydraulic piston area is approximately 12:1, meaning that 7 bar of air pressure produces about 84 bar of hydraulic pressure, with further multiplication available from the pedal linkage. This design allows a small, lightweight unit to generate ample force for disengaging even the heaviest diaphragm springs in heavy‑duty clutches.
The aluminum body is pressure‑die‑cast to achieve tight tolerances and then impregnated with a sealing resin to prevent porosity leaks. The air cylinder bore is honed to a 0.4 µm Ra finish, and the hydraulic bore is roller‑burnished for wear resistance. Every booster is tested for air‑side and hydraulic‑side leakage before leaving the factory.
The WG9719230023GKC110 uses a combination of U‑cup and O‑ring seals. The main pneumatic piston seal is a low‑friction PTFE‑filled polyurethane, capable of millions of cycles without wear. The hydraulic piston uses a precision‑molded EPDM cup seal with a stainless steel expander spring, ensuring leak‑free operation even after long periods of inactivity.
A dust boot covers the pushrod entry point, preventing dirt ingress that could score the hydraulic bore. All seals are compatible with glycol‑based brake fluids (DOT 3/4) and mineral oils, but the unit is shipped dry – the installer must flush and fill with the correct fluid.
For mineral oil applications (e.g., some European trucks), an FKM seal version is available on request. The standard version is designed for DOT 4 clutch systems.
The WG9719230023GKC110 is a direct replacement for original clutch boosters on SINOTRUK HOWO, SHACMAN, and many ZF‑based transmissions. It mounts on the clutch housing using three M8 bolts. The air supply line connects via a quick‑release coupling with an M12x1.5 thread; the hydraulic line uses a standard M10x1 banjo bolt.
After installation, adjust the pushrod length so that there is 1‑2 mm of free play before the booster engages. Over‑adjustment can cause clutch slip, while under‑adjustment increases pedal stroke. A locknut secures the pushrod setting.
Bleed the hydraulic system using DOT 4 fluid only (unless the system is mineral oil). Do not mix fluid types – flush completely if switching. The booster does not require any separate air bleeding; it self‑bleeds after a few pedal strokes.
Follow these steps for correct installation of the WG9719230023GKC110 Clutch Booster Cylinder: 1) Safely raise the vehicle and support the transmission. Remove the old booster after draining the hydraulic line.
2) Clean the mounting surface on the clutch housing. Install the new booster with new gaskets and lock washers. Torque the three mounting bolts to 25 Nm.
3) Connect the air supply line (use thread sealant on M12x1.5 fitting). Connect the hydraulic line with a new copper sealing washer; torque the banjo bolt to 18 Nm.
4) Adjust the pushrod length. Screw the rod in or out until the free play (distance from pushrod to clutch fork) is 1‑2 mm. Tighten the locknut to 15 Nm.
5) Fill the clutch reservoir with DOT 4 fluid and bleed the system using a vacuum bleeder or by pumping the pedal 20‑30 times while opening the bleeder valve on the slave cylinder.
6) Start the engine, build air pressure, and test the clutch engagement. Pedal should feel light and progressive, with full disengagement when pressed to the floor.
Inspect the WG9719230023GKC110 every 100,000 km. Check for air leak at the top cap (a hissing sound when the pedal is released indicates a leaking air valve diaphragm). Hydraulic leaks will appear as fluid around the pushrod or banjo fitting.
If the clutch pedal feels heavy but the air system pressure is normal, the booster may have internal mechanical binding. If the pedal does not return fully, the return spring or pushrod adjustment may be incorrect.
Do not attempt to disassemble the booster – it contains a strong return spring and precision parts that are not field‑serviceable. Replace the entire unit if a malfunction is detected. Flush the clutch hydraulic system every two years to remove moisture and contaminants.
Each WG9719230023GKC110 is manufactured under IATF 16949 and ISO 9001 certified systems. Tests include: (1) Pneumatic leakage test (0.5 bar differential, no drop over 30 seconds), (2) Hydraulic pressure test (150 bar for 1 minute, no external leakage), (3) Cycle endurance test (2 million cycles on a test fixture), (4) Thermal cycle test (-40°C to +100°C, 50 cycles), (5) Corrosion test (240h salt spray, no red rust on steel parts).
(6) Burst pressure test (hydraulic side to 300 bar, air side to 15 bar), (7) Function test (output vs. input pressure curve measured). Each unit is serialized, and a certificate of conformance is supplied.
The booster meets OEM specifications for ZF, Eaton, and Fuller transmissions and is ECE R13 approved for use in commercial vehicles.
A European parcel delivery fleet with 180 HOWO trucks replaced failing clutch boosters with the WG9719230023GKC110. After two years, only two boosters required replacement due to external damage, compared to 30 failures per year previously. Driver satisfaction improved, with complaints about heavy clutch pedal dropping to zero.
A mining contractor in Peru using SHACMAN dump trucks reported that the new boosters allowed one‑finger clutch operation, reducing driver fatigue in 12‑hour shifts. They also noted that the improved engagement reduced clutch slip, extending clutch life from 6 months to 14 months.
Each WG9719230023GKC110 Clutch Booster Cylinder is packaged in a custom foam‑lined carton with separate compartments for the unit and the fitting kit. A moisture‑absorbing desiccant pouch is included to prevent corrosion.
A tamper‑evident holographic sticker with the SINOTRUK Homan logo is placed on the booster body. The box features a QR code that links to the official authenticity verification portal. Counterfeit boosters often have poor casting quality, missing breather caps, or incorrect thread sizes.
Genuine WG9719230023GKC110 has an engraved serial number and a “SINOTRUK Homan” logo cast into the housing. Purchase only from authorized distributors to ensure genuine seal materials and safety.
Summary: The SINOTRUK Homan Clutch Booster Cylinder (OEM WG9719230023GKC110) delivers effortless clutch actuation, high reliability, and long service life for heavy‑duty trucks. Upgrade your clutch system with this genuine OEM pneumatic booster – the trusted choice for driver comfort and drivetrain protection.
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