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The Clutch Slave Cylinder with OEM numbers 8-98004780-0 (also listed as 8980047800) and 8973494230 is a verified OEM-grade direct replacement for ISUZU NPR, NKR, and compatible N-Series trucks equipped with 4HF1 and 4HG1 engines, mated to the MYY5T manual transmission.
Important Fitment Note: This cylinder is specifically designed for vehicles equipped with the MYY5T manual transmission and 4HF1 or 4HG1 engines. Always verify your vehicle's transmission and engine codes before ordering.
OEM Specifiion
Verified by ISUZU OEM part numbers 8-98004780-0, 8980047800, and 8973494230
Precision 1″ (25.4mm) Bore
Delivers consistent hydraulic pressure for reliable clutch actuation
Proven Durability
Constructed from high-grade cast iron with premium sealing components for superior heat and corrosion resistance
Broad Compatibility
Fits ISUZU NPR, NKR, N-Series with 4HF1, 4HG1 engines and MYY5T transmission
Failure Symptoms
If your clutch slave cylinder is failing, you may experience one or more of the following symptoms:
Soft or Spongy Clutch Pedal: Pedal feels unusually soft, spongy, or goes to the floor without resistance
Difficulty Shifting Gears: Hard to engage or disengage gears, accompanied by grinding noises
Clutch Pedal Heavy or Stiff: Pedal requires excessive force to depress
Clutch Drag / Incomplete Disengagement: Vehicle creeps forward with clutch fully depressed, or gears grind when shifting
Visible Fluid Leakage: Brake/clutch fluid seeping from the slave cylinder area
Clutch Engagement Point Changes: Pedal engages very close to the floor or very high
Warning: A failing clutch slave cylinder can lead to incomplete clutch disengagement, gear grinding, and potential transmission damage. Prompt replacement is essential to maintain safe and reliable vehicle operation.
Vehicle & Engine Compatibility
Brand
Model
Chassis / Series
Transmission
Engine
ISUZU
NPR
N-Series
MYY5T
4HF1, 4HG1
ISUZU
NKR
N-Series
MYY5T
4HF1
ISUZU
N-Series
Various
MYY5T
4HF1, 4HG1
Important: This clutch slave cylinder is specifically designed for the ISUZU MYY5T manual transmission. Fits ISUZU NPR and NKR models with 4HF1 and 4HG1 engines. This cylinder is commonly used in NPR66, NKR66, and NPR71 chassis. Please verify your vehicle's transmission model (MYY5T), chassis code, and engine code before ordering.
Features & Benefits
Feature
Benefit + Verifiion Signal
OEM Specifiion — ISUZU Genuine Equivalent
Guarantees factory-fit quality and performance — verified by OEM part numbers 8-98004780-0, 8980047800, and 8973494230
Precision 1″ (25.4mm) Bore
Delivers consistent hydraulic pressure for reliable clutch actuation — verified by dimensional specifiions
High-Grade Cast Iron Construction
Provides exceptional durability and corrosion resistance under demanding commercial conditions — verified by material specifiions
MYY5T Transmission Compatibility
Specifically engineered for ISUZU MYY5T manual transmissions — verified by transmission model compatibility
Direct Bolt-On Fitment
No modifiions required — engineered as a direct match for the original cylinder
100% Pressure Tested
Guarantees dependable operation and leak-free performance — verified by quality assurance testing
100% New — No Core Charge
Guarantees zero wear, immediate hydraulic performance, and full service life — no core deposit required
Quality Control & Verifiion
Our manufacturing and inspection processes ensure every clutch slave cylinder meets or exceeds ISUZU OEM standards.
QC Item
Verifiion Method
Dimensional Accuracy
Precision inspection to verify 1″ (25.4mm) bore diameter, M10 x 1.25 threads, and mounting hole spacing match OE blueprint specifiions
Material Composition
Cast iron analysis to verify structural integrity and corrosion resistance
Bore Surface Test
100% surface testing to ensure optimum sealing surface for pressure cups
Leakage Test
100% hydraulic pressure test to guarantee zero fluid leakage under operating conditions
Piston Function Test
Full actuation test to verify smooth piston movement and seal integrity
Durability Cycle Test
500+ hour fatigue testing to verify long-term reliability under commercial vehicle operating conditions
Final Assembly Inspection
100% visual and functional inspection before packaging
Installation & Maintenance Recommendations
IMPORTANT: Professional Installation Recommended
Pre-Installation Checklist
Ensure the vehicle is securely supported on jack stands or a lift
Clean the area around the slave cylinder to prevent contamination
CRITICAL: Verify your vehicle has the MYY5T transmission — this cylinder is specifically designed for this transmission
Inspect the clutch hydraulic line for damage or corrosion — replace if necessary
Check the clutch fork and release bearing for wear while the slave cylinder is removed
Use new brake fluid (DOT 3 or DOT 4) from a sealed container
Installation Guidelines
(Reference ISUZU workshop manual):
Safely raise the vehicle and secure it on jack stands
Loe the clutch slave cylinder on the transmission bell housing
Disconnect the hydraulic line from the slave cylinder — plug the line to prevent fluid loss and contamination
Remove the mounting bolts securing the slave cylinder to the transmission
Remove the old slave cylinder and push rod
Clean the mounting surface on the transmission thoroughly
Install the new slave cylinder with the push rod correctly positioned
Torque the mounting bolts to manufacturer's specified torque settings (refer to ISUZU workshop manual)
Reconnect the hydraulic line and torque to specifiion
CRITICAL: Bleed the clutch hydraulic system thoroughly to remove all air (start with the slave cylinder)
Check the clutch fluid level and top up with fresh DOT 3 or DOT 4 brake fluid as required
Test the clutch pedal feel and verify smooth gear engagement before road test
Maintenance Schedule
Inspection: Every 50,000 km / 12 months. Check for fluid leaks, pedal feel, and smooth gear engagement
Fluid Replacement: Every 2 years or 40,000 km — replace clutch fluid to prevent internal corrosion
Replacement: Immediately if failure symptoms appear
Packaging & Supply
Packaging: Each clutch slave cylinder is securely packed in protective packaging to prevent shipping damage
Package Contents: 1 Clutch Slave Cylinder (Push rod included)
Suitable for: Wholesale distributors, truck parts retailers, commercial vehicle repair shops, and fleet owners
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 ...