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The Clutch Booster Assembly (BOOSTER ASM; CLU) with OEM numbers 1-31800516-1 (also listed as 1318005161), 1-31800344-0 (also listed as 1318003440), 1-87610089-0 (also listed as 1876100890) is a verified direct-fit replacement for ISUZU FVR34 heavy-duty trucks equipped with the 6HK1 7.8L diesel engine.
As a critical component of the hydraulic clutch system, this clutch booster (also known as a clutch servo or hydraulic-pneumatic clutch assist) combines hydraulic and pneumatic assistance to multiply the force applied to the clutch pedal. It significantly reduces pedal effort, enabling smooth gear changes and precise clutch control, which is essential for the safe and efficient operation of heavy-duty commercial vehicles.
This clutch booster is manufactured to ISUZU's stringent OEM specifications, ensuring reliable performance and long service life. It is suitable for both Right-Hand Drive (RHD) and Left-Hand Drive (LHD) configurations, depending on the vehicle's specific setup.
Real Shop Test Data: Precision-engineered 90mm bore booster delivers consistent hydraulic-pneumatic assistance — verified against ISUZU OEM specifications
Proven Durability: Built with high-grade cast housing and premium internal seals — rated for 500,000+ km under normal operation based on OEM-grade manufacturing standards
Installation Success Rate:99% direct bolt-on fitment — confirmed across thousands of repair orders for ISUZU FVR34 6HK1 vehicles
If your clutch booster is failing, you may experience one or more of the following symptoms:
Excessive Clutch Pedal Effort: Pedal feels unusually heavy or stiff — indicates loss of pneumatic or hydraulic assistance
Difficulty Shifting Gears: Hard to engage or disengage gears, accompanied by grinding noises — the clutch is not fully disengaging
Reduced Clutch Responsiveness: Noticeable delay or inconsistency in clutch engagement
Air or Fluid Leakage: Visible air or hydraulic fluid seepage from the booster assembly — indicates worn internal seals
Unusual Noises: Hissing or squealing sounds when depressing the clutch pedal
⚠️ A failing clutch booster can lead to incomplete clutch disengagement, gear grinding, and potential transmission damage — prompt replacement is essential to maintain safe and reliable vehicle operation.
Part Number
1-31800516-1 1318005161 1-31800344-0 1318003440
Product Name
Clutch Booster Assembly
Car Model
ISUZU FVR34/FVZ34
Engine Model
ISUZU 6HK1
Condition
100% Brand New
Origin
China Mainland
Main Market
Middle East, Asia, Africa, South America, North America & Europe
Vehicle & Engine Compatibility
Primary Applications:
Brand
Model
Chassis / Series
Engine
Years / Notes
ISUZU
FVR34
FORWARD 18.0
6HK1 7.8L Diesel
Primary application
ISUZU
FVZ34
Heavy-Duty Truck
6HK1 7.8L Diesel
Compatible
ISUZU
FVR
FORWARD Series
6HK1-TC
Compatible
ISUZU
FTR
FORWARD
6HK1
Compatible
ISUZU
FSR
FORWARD
6HK1
Compatible
Important Compatibility Notes
This clutch booster is designed specifically for ISUZU 6HK1 diesel engines
Compatible with ISUZU FVR34, FVZ34, FTR, and FSR series trucks
The 90mm bore specification is critical — verify your vehicle's requirement before ordering
This assembly is compatible with both Right-Hand Drive (RHD) and Left-Hand Drive (LHD) configurations
Please verify your vehicle's chassis code, production year, and engine code before ordering
Features & Benefits
OEM Specification — ISUZU Genuine Equivalent Guarantees factory-fit quality and performance — verified by OEM part numbers 1-31800516-1, 1318005161, 1-31800344-0, and 1318003440
90mm Precision Bore Delivers optimal hydraulic-pneumatic assistance for consistent clutch actuation — verified by dimensional specifications
High-Grade Cast Construction Withstands high-pressure hydraulic and pneumatic operation for long service life — verified by material specifications
Premium Internal Seals Ensures leak-free operation and consistent performance under extreme conditions — verified by OEM-grade material standards
Heavy-Duty Commercial Application Engineered to withstand the demanding conditions of FVR34/FVZ34 truck operation — verified by ISUZU heavy-duty standards
Significantly Reduces Pedal Effort Minimizes driver fatigue and ensures smooth, precise gear changes — verified by hydraulic-pneumatic assist design
Direct Bolt-On Fitment No modifications required — verified by 99% installation success rate
100% New — No Core Charge Guarantees zero wear, immediate clutch performance, and full service life — no core deposit required
Quality Control & Verification
Our manufacturing and inspection processes ensure every clutch booster meets or exceeds ISUZU OEM standards.
QC Item
Verification Method
Dimensional Accuracy
Precision inspection to verify 90mm bore diameter, mounting bolt pattern, and hydraulic port threads match OE blueprint specifications
Hydraulic Pressure Test
100% pressure testing to guarantee zero fluid leakage under operating conditions
Pneumatic Function Test
Full actuation testing to verify pneumatic assistance meets OEM specifications
Seal Integrity Test
100% seal testing to ensure leak-free operation under extreme conditions
Durability Cycle Test
500+ hour fatigue testing to verify 500,000+ km service life
Final Assembly Inspection
100% visual and functional inspection before packaging
Installation & Maintenance Recommendations
⚠️ IMPORTANT: Professional Installation Recommended
Pre-Installation Checklist:
Safely raise the vehicle and support it on jack stands
CRITICAL: This is a combination hydraulic and pneumatic component — ensure both systems are depressurized before removal
Clean the area around the booster to prevent contamination
Inspect the hydraulic line and air supply line for damage — replace if necessary
Check the clutch fork and release bearing for wear while the booster is removed
Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ... Yimi (Guangzhou) Automotive Parts Co., Ltd.
Located in Guangzhou—the economic and transportation hub of Southern China—we are a specialized supplier and exporter with over 20 years of experience in the automotive parts industry. We focus on the production and sales of high-quality ...
