Howo Clutch Booster

Premium-quality Howo Clutch Booster engineered for extreme durability. Trusted by fleets worldwide — experience zero compromise with certified Sinotruk HOWO components. Your journey to unmatched performance starts here.

Sinotruk Howo Clutch Booster

For heavy-duty trucks, clutch fatigue is a real issue. The Howo Clutch Booster significantly reduces pedal effort while providing precise clutch disengagement. Engineered for 12/16‑speed manual and AMT gearboxes, our booster ensures smooth gear changes and extends clutch life. As part of our premium Howo truck parts lineup, each Howo Clutch Booster is factory calibrated to match your transmission’s hydraulic and pneumatic requirements.

Whether you operate a Howo A7, T7H, TX, or Sitrak C7H, the correct Howo Clutch Booster eliminates clutch drag, reduces driver fatigue, and prevents premature throwout bearing failure. Choose from standard Φ102mm, lightweight Φ90mm, or AMT‑specific models with integrated position sensors.

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Essential Functions of the Howo Clutch Booster

Pneumatic Assist

Uses vehicle air system (0.7–1.0 MPa) to multiply driver input, reducing pedal force by up to 30% for fatigue‑free operation.

Precise Clutch Engagement

Hydraulic + pneumatic combined action ensures smooth modulation, preventing jerky starts and reducing driveline shock.

Integrated Position Sensor (AMT)

AMT‑specific boosters feature a built‑in linear sensor for TCU to read clutch travel, enabling automated shifting.

Adjustable Pushrod

Standard boosters come with an adjustable pushrod (230–260mm) for fine‑tuning free play and clutch stroke.

Specification Comparison – Howo Clutch Booster Types

ParameterStandard Heavy (Φ102)Lightweight (Φ90)AMT Dedicated
Part NumberWG9725230041WG9525230062WG9700240035
Booster Bore (mm)Φ102Φ90Φ102
Working Hydraulic Bore (mm)Φ25Φ22Φ25
Operating Pressure (MPa)0.7–1.00.7–0.90.7–1.0
Gearbox Compatibility12/16‑speed manual8/10‑speed manualAMT auto
Weight (kg)6.55.27.0 (with sensor)

Mainstream Howo Clutch Booster Models

WG9525230062 Clutch Booster WG9525230062 (Lightweight)

Φ90/Φ22, 0.7–0.9 MPa, 5.2kg. For T5G/TX 8/10‑speed manual boxes.

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WG9700240035 AMT Clutch Booster WG9700240035 (AMT)

Φ102/Φ25 with integrated position sensor for T7H/TH7/Sitrak AMT transmissions.

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WG9725230041 Clutch Booster WG9725230041 (Standard MT)

Φ102/Φ25, 0.7–1.0 MPa, stroke 38‑42mm. For 12/16‑speed A7/T7H/TH7 6×4/8×4.

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WG9725230051 Clutch Booster WG9725230051 (Enhanced)

Φ102/Φ25, strengthened seals for Euro 5/6 engines. Fits T7H/Sitrak C7H.

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Compatible Sinotruk Howo Models

Howo A7 / T7H / TH7 / TX (6×4/8×4)

Heavy‑duty 12/16‑speed manual trucks use WG9725230041. AMT versions use WG9700240035. All with Φ102 booster.

Howo T5G / TX lightweight series

Models with 8/10‑speed manual boxes use lightweight Φ90 booster WG9525230062. Also fits some Sitrak C7H Euro5.

Why Choose Our Howo Clutch Booster

OEM Quality Assurance
Direct from Sinotruk authorized foundry – 100% pressure‑tested before shipment.
Durable Seals
High‑temperature HNBR rubber lasts over 1 million cycles without leakage.
Global Warehouses
Stock in China, Dubai, Houston – express delivery to 80+ countries.
24/7 Technical Help
Our team assists with identification, adjustment, and troubleshooting.
Fleet & Bulk Pricing
Discounts for 5+ units – ask for a quote based on your order.
12‑Month Warranty
Free replacement for any manufacturing defect (excluding wear parts).

Driver & Fleet Feedback

“Replaced my old clutch booster with WG9725230041. Now the clutch feels like a sedan – so light! Shifting is precise even in city traffic.”

– Carlos, Driver, Brazil

“We installed 20 AMT boosters (WG9700240035) on our T7H fleet. The position sensor works flawlessly with the transmission control unit.”

– Li Wei, Fleet Supervisor, China

“Needed a lightweight booster for our T5G. WG9525230062 was a perfect fit, and the reduced weight saved a few kilos. Very happy.”

– Ahmed, Truck Workshop, UAE

“Fast shipping to Russia. The booster came with adjustment instructions. My drivers no longer complain about heavy clutch.”

– Dmitry, Fleet Owner, Russia

FAQs – Howo Clutch Booster

1. How do I know if my clutch booster is failing?
Signs: unusually heavy pedal, clutch not fully disengaging (hard to shift), or air/hydraulic leaks around the booster.
2. Can I replace just the rubber seal kit?
Yes, but only for minor leaks. For worn bore or damaged piston, replace the complete booster. We supply seal kits separately.
3. What is the correct air pressure for Howo Clutch Booster?
0.7–1.0 MPa (7–10 bar). Ensure vehicle air system is properly maintained – low pressure will reduce assist.
4. How to adjust the pushrod length?
Loosen the lock nut, rotate the pushrod to achieve 2–3mm free play at the clutch fork. Over‑adjustment can damage clutch.
5. My AMT booster shows error code – what to do?
Check the position sensor wiring and connector. Sensor output should be linear (0.5–4.5V). Replace if erratic.
6. Does the booster require special fluid?
Use DOT4 brake fluid. Do not use mineral oil. Bleed the system after installation.
7. Can I use a heavy‑duty booster on a lightweight truck?
Yes, but it may deliver higher force than needed. Use the correct Φ90 or Φ102 based on original specification.

Troubleshooting & Solutions

Clutch pedal extremely heavy
→ Check air supply line pressure (should be >0.7 MPa). Also inspect booster pneumatic piston for jamming.
Clutch does not fully disengage (gear grinding)
→ Short pushrod stroke or internal hydraulic bypass. Adjust pushrod or replace booster.
Oil leaking from breather hole
→ Worn secondary hydraulic seal. Replace booster immediately – oil can contaminate clutch disc.
AMT shows “clutch position sensor fault”
→ Sensor wiring open or sensor failed. Measure sensor output; replace WG9700240035 if defective.

Quick Resource Hub

Catalog PDF

Install Video

Adjustment Guide

Genuine Check

Maximize Clutch Life & Driver Comfort with a Genuine Howo Clutch Booster – The clutch booster is a critical component that often gets overlooked until failure occurs. A properly functioning Howo Clutch Booster not only reduces physical strain on drivers but also protects the clutch release bearing and flywheel from heat damage. Our boosters are manufactured using high‑grade cast iron for the housing and corrosion‑resistant alloy for the hydraulic cylinder.

All units are honed to mirror‑finish surface (Ra ≤0.2μm) to ensure seal longevity. For workshop owners, we stock complete rebuild kits, including diaphragms, o‑rings, and pushrod boots. Heavy‑duty applications (mining, logging) benefit from the reinforced WG9725230060 with upgraded dust boots and high‑temperature grease. For AMT trucks, the integral position sensor in WG9700240035 provides real‑time clutch position feedback to the TCU, enabling faster and smoother gear shifts. We also supply the necessary mounting brackets and air line fittings for retrofitting older trucks. All Howo Clutch Booster units come with a 12‑month unlimited‑mileage warranty. Keep your Howo shifting like new – choose genuine Sinotruk parts.

Need assistance identifying the correct booster for your VIN? Contact our support team with a photo of your old unit and gearbox model. We respond within 2 hours. Genuine Howo Clutch Booster – the muscle behind every smooth gear change.

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