ISUZU Clutch Slave Cylinder 8-98040043-0 8980400430 for NMR NLR NPR75 NQR90 4JJ1 4HK1 — OEM Standard 25.4mm Bore MYY6 Transmission Verified Fit
Key Attributes
Product Summary
OEM-standard ISUZU clutch slave cylinder (8-98040043-0) for NMR/NLR/NPR75/NQR90 with 4JJ1/4HK1 engines and MYY6 transmission. Features 25.4mm precision bore, metal body with oil-resistant seals, and verified direct fit. Backed by 3-month warranty, cross-referenced to BLUE PRINT and KAVO PARTS, with neutral or custom packaging and fast in-stock shipping.
Product Details
ISUZU Clutch Slave Cylinder 25.4mm Bore
,OEM 8-98040043-0 Clutch Slave Cylinder
,Clutch Slave Cylinder for NPR75 NQR90
The Clutch Slave Cylinder with OEM numbers 8-98040043-0 / 8980400430 is a verified direct-fit replacement for ISUZU NMR85, NLR85, NPR75, and NQR90 trucks equipped with 4JJ1, 4HK1, and 6HK1 diesel engines. Installed on the side of the transmission, it converts hydraulic pressure from the clutch master cylinder into mechanical force that pushes the clutch release fork, disengaging the clutch pressure plate for smooth gear shifting.
Designed for the MYY6 manual transmission with a bore diameter of 25.4 mm, the internal piston and seals are precision-machined to ensure stable hydraulic transmission and leak-free operation under frequent shifting conditions. Manufactured to OEM standard dimensions, the mounting holes and hydraulic ports precisely match the original, allowing direct replacement without modifying hydraulic lines or transmission brackets.
- Bore diameter: 25.4 mm
- Net weight: 898 g
- Package dimensions: 24.69 × 18.49 × 15.39 cm
- Transmission compatibility: MYY6
- Condition: New
- Origin: China / Japan
- Packaging: Neutral carton or customer brand packaging
- Durability: 3-month warranty (IZUMI brand standard); small batch trial orders accepted with volume discounts
- Lead time: 15–20 days; in-stock items ship within 3–5 days
- Fitment: Standard mounting dimensions with direct replacement design, covering ISUZU NMR85 / NLR85 / NPR75 / NQR90 / ELF models with 4JJ1 / 4HK1 / 6HK1 diesel engines and MYY6 manual transmission
Replaces ISUZU OEM numbers 8-98040043-0 / 8980400430 / 8-98040-043-0 / 98040043.
- Series cross-references: 8-98040043-1 / 8980400431 / 8-98040-043-1, 8-98089676-0 / 8980896760, 8-98089676-1 / 8980896761
- Brand cross-references: ADZ93628 (BLUE PRINT), CCS-9053 (KAVO PARTS, Diameter 25.4), 115-80589 (Seiken), CSC0431 (Zevs), CC0890 (QML)
When the clutch slave cylinder exhibits any of the following conditions, timely inspection and replacement are required:
- Spongy clutch pedal or abnormal travel: Aged internal seals cause hydraulic pressure leakage, resulting in a weak pedal feel and slow pedal return.
- Difficulty shifting or inability to engage gears: Insufficient cylinder thrust prevents full clutch disengagement, causing gear clash or an inability to shift into gear.
- External fluid leakage from the slave cylinder: Brake fluid seepage at the piston seal or dust boot, with visible oil stains on the cylinder exterior and transmission housing.
- Clutch pedal fails to return after depression: Piston seizure or return spring failure prevents normal pedal rebound.
- Continuous brake fluid level drop: Internal seal failure causes hydraulic fluid leakage into the dust boot or exterior, resulting in an abnormal reservoir level drop.
| Part Number | 8-98040043-0 / 8980400430 | Product Name | Clutch Slave Cylinder |
|---|---|---|---|
| Car Model | NMR / NLR / NPR75 / NQR90 | Engine Model | 4JJ1 / 4HK1 |
| Condition | 100% Brand New | Size | Standard |
| Weight | Standard | Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe | Package | Neutral packing or made as requested |
| Material | High-strength aluminum alloy & precision bearings | Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement | Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model | Series | Engine | Note |
|---|---|---|---|---|
| ISUZU | NMR85 | N-Series | 4JJ1 / 4HK1 | Clutch slave cylinder (MYY6 transmission) |
| ISUZU | NLR85 | N-Series | 4JJ1 | Clutch slave cylinder (MYY6 transmission) |
| ISUZU | NPR75 | N-Series | 4HK1 / 6HK1 | Clutch slave cylinder (MYY6 transmission) |
| ISUZU | NQR90 | N-Series | 4HK1 | Clutch slave cylinder (MYY6 transmission) |
| ISUZU | ELF | ELF Series | 4JJ1 / 4HK1 | Series reference |
Data source: Vehicle and engine compatibility per ru-isuzu.ru (NLR85 / NMR85 / NPR75 / NQR90) and zevsparts.ru (ISUZU ELF) product pages.
Important:
Model & Transmission Confirmation: This slave cylinder primarily fits NMR85, NLR85, NPR75, and NQR90 models with MYY6 manual transmission and 4JJ1 / 4HK1 / 6HK1 engines. Variations may exist across model years or transmission configurations. Verify the original slave cylinder number and transmission model before ordering.
LHD / RHD Distinction: Some listings indicate this cylinder is for LHD (Left-Hand Drive) models (NLR / NMR 55/85 LHD). Confirm drive configuration before ordering.
Pre-Installation Verification: Please provide the VIN, original slave cylinder number, or transmission model for precise fitment confirmation.
| Feature | Benefit & Verification Signal |
|---|---|
| 25.4 mm Bore Precision Match | Bore diameter matches the original clutch hydraulic system design, ensuring balanced pedal effort and release travel with original shift feel — verified against KAVO PARTS CCS-9053 specification (Diameter 25.4). |
| MYY6 Transmission Specific Fitment | Designed specifically for ISUZU MYY6 manual transmission with a precise mounting interface and push rod travel; no adjustment required — per ru-isuzu.ru transmission compatibility information. |
| Metal Cylinder Body + Oil-Resistant Seals | Metal body withstands hydraulic pressure; rubber seals resist brake fluid corrosion for long-term leak-free operation — per general product construction and industry standards. |
| Direct Replacement Design | Mounting holes and hydraulic line ports precisely match the original; no modification to hydraulic lines or transmission brackets required — verified against OEM standard dimensions. |
| Multiple Brand Availability | IZUMI, QML, JMC, SKV, Zevs and other brand options are available to meet different budget and procurement channel requirements — per supplier cross-reference listings. |
| 3-Month Warranty | Provides reliable after-sales protection and reduces procurement risk — per IZUMI brand warranty terms. |
| QC Item | Verification Method |
|---|---|
| Bore Diameter Accuracy Inspection | Inside micrometer / CMM measurement — ensures the 25.4 mm bore meets OEM standards. |
| Sealing Performance Test | Air / hydraulic pressure test — verifies no internal or external leakage under rated pressure. |
| Piston Movement Smoothness Test | Reciprocating motion test — verifies smooth piston movement without binding. |
| Push Rod Travel Inspection | Travel measurement — verifies push rod extension and stroke meet original release fork operating requirements. |
| Appearance & Packaging Inspection | 100% visual inspection — no cracks, blowholes, or rust; packaging meets transport requirements. |
Important: Clutch slave cylinder installation involves hydraulic system disassembly and bleeding. Professional installation by a qualified technician is recommended. Clean the cylinder mounting surface and hydraulic line fittings before installation. Never allow brake fluid to contact painted surfaces (brake fluid is corrosive). After installation, the hydraulic system must be thoroughly bled until the clutch pedal feels firm and shifting is smooth.
- Disconnect power: Disconnect the negative battery terminal to prevent electrical short circuits.
- Drain brake fluid: Extract a small amount of brake fluid from the reservoir to prevent overflow during removal.
- Remove old cylinder: Disconnect the hydraulic inlet line fitting (use a flare nut wrench to prevent fitting damage) and remove the mounting bolts; extract the old cylinder.
- Install new cylinder: Position the new cylinder, hand-thread the mounting bolts first, confirm alignment, then tighten to the specified torque. Connect the hydraulic inlet line and tighten the fitting to the specified torque.
- Fill and bleed: Fill with the specified new brake fluid. Bleed air from the hydraulic system per the workshop manual method (typically a two-person procedure: one depresses the pedal, one operates the bleeder valve) until the pedal is firm.
- Function test: Start the engine and repeatedly depress the clutch pedal to test clutch disengagement and engagement. Check the cylinder and line fittings for leakage.
- Road test: Perform a short road test to confirm smooth shifting in all gears without gear clash or abnormal noise.
- Every 20,000 km or 12 months: Check the clutch slave cylinder for leakage; check brake fluid level and quality.
- Every 50,000 km: Replace the clutch hydraulic system brake fluid; inspect piston and seal condition.
- When a spongy pedal, difficult shifting, or cylinder leakage is detected: Inspect the cylinder seal condition promptly and replace if necessary.
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