SINOTRUK HOWO T7H T5G SITRAK WG9731470070 Clutch Booster Cylinder Assembly Φ70 Heavy Truck Spare Part Factory Direct Supply for Export
No.:
Vehicle Type: Sinotruk Truck Parts
Brand Name: SINOTRUK
Person in charge: William Du
Cel: 8619050562894
Whatsapp: 8619050562894
E-mail: sales22@chinatruck.cc
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Details
Product Overview
WG9731470070 is a Φ70 clutch booster cylinder assembly used in heavy-duty pneumatic clutch control systems.
Main functions:
Reduce clutch pedal force under heavy load
Improve clutch disengagement stability
Stabilize pneumatic boost pressure
Improve shift engagement response
Reduce diaphragm fatigue and air leakage failure
Improve long-haul driving comfort
Compared with low-grade booster cylinders, correct Φ70 bore sizing directly affects clutch release force balance, return speed, and clutch engagement consistency.
Technical Specification
| Parameter | Specification |
|---|---|
| OEM Number | WG9731470070 |
| Product Name | Clutch Booster Cylinder Assembly |
| Vehicle Platform | SINOTRUK Heavy Truck |
| Bore Size | Φ70 |
| System Type | Pneumatic Clutch Assist System |
| Material | Cast aluminum housing + steel piston rod + reinforced diaphragm |
| Pressure Type | Air-assisted |
| Installation Position | Clutch control side assembly |
| Core Function | Clutch boost / disengagement assist |
| Common Failure | Air leakage / weak boost / delayed clutch return / unstable pedal force |
Fitment Application
| Brand | Model Series | Fitment |
|---|---|---|
| SINOTRUK HOWO | T7H | Direct Fit |
| SINOTRUK HOWO | T5G | Direct Fit |
| SINOTRUK SITRAK | C7H / related platform | Cross verification required |
| SINOTRUK | Heavy-duty air clutch systems | OEM match required |
Fitment Verification
Before order confirmation, verify:
OEM number WG9731470070
Cylinder bore Φ70
Air inlet thread specification
Mounting bracket spacing
Push rod stroke length
Clutch assist platform type
Vehicle VIN confirmation
Old cylinder casting number
Supplier quality grade
Low-grade aftermarket booster cylinders often create unstable air pressure, weak assist, and early diaphragm cracking.
Common Failure Case
A common fleet issue in mining and overloaded transport trucks:
About 35%–45% of repeated clutch assist complaints are caused by air leakage or diaphragm fatigue rather than transmission failure.
Typical case:
Truck model: HOWO T7H tractor head
Mileage: 280,000–420,000 km
Issue:
Heavy clutch pedal
Delayed clutch separation
Hard shifting into 1st and reverse
Driver suspects gearbox issue
Repeated clutch adjustment ineffective
Inspection result:
Air-assisted clutch booster diaphragm internal leakage caused unstable release pressure.
Solution:
Replacing WG9731470070 restored clutch separation consistency, reduced pedal load, and avoided unnecessary gearbox teardown cost.
Wrong Part Risk Control
| Risk | Customer Concern | Solution |
|---|---|---|
| Wrong bore size | Weak or over-assisted clutch response | Verify Φ70 |
| Wrong rod stroke | Incomplete disengagement | Match original stroke |
| Wrong air fitting | Installation impossible | Check air port spec |
| Low-grade diaphragm | Early air leakage | Pressure-tested diaphragm batch |
| Shipping deformation | Mounting failure | Reinforced export packing |
| Fake casting | Short life cycle | OEM-grade traceability |
Supplier Stability & Procurement Value
Customers buying clutch booster assemblies care about repeat life, sealing quality, and stable installation.
How quality is controlled:
Pressure leakage inspection
Diaphragm fatigue batch test
Push rod tolerance inspection
Casting cavity inspection
Pneumatic response consistency test
Export lot tracking
OEM dimension matching
Customer benefit:
Lower repeat replacement risk
Stable fleet maintenance planning
Reduced downtime
Better clutch system reliability
Lower hidden repair cost
Related SINOTRUK Truck Parts
Clutch Control System
| Part Name | OEM Number |
|---|---|
| Clutch Booster Cylinder Assembly Φ70 | WG9731470070 |
| Clutch Master Cylinder | WG9719230023 |
| Clutch Slave Cylinder | WG9725230042 |
| Clutch Release Bearing | AZ9725160100 |
Air Assist / Pneumatic System
| Part Name | OEM Number |
|---|---|
| Air Dryer Assembly | WG9000360524 |
| Brake Valve | WG9000360180 |
| Air Compressor Line | WG9719530111 |
| Pneumatic Hose Connector | WG Series |
High-Failure Linked Maintenance Parts
| Part Name | OEM Number |
|---|---|
| Clutch Disc | AZ9725160100 |
| Pressure Plate | AZ9725160102 |
| Clutch Fork | WG9725230011 |
| Air Pipe Repair Kit | WG900036 series |
Contact
William Du
Heavy Truck Aftermarket Fitment & Supply Chain Specialist
WhatsApp / WeChat: +86 19050562894
Email: Sales22@chinatruck.cc
Truck Coverage: SINOTRUK HOWO / SITRAK / SHACMAN / FAW / Weichai Platforms
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