ISUZU Water Pump Assembly with Gasket OEM Standard for 4JG1 Engine ZX70 ZX80 Excavator
Basic Properties
Place of Origin:
CHINA
Brand Name:
YIMI
Certification:
ISO/TS16949
Model Number:
ZX70 ZX80 4JG1
Trading Properties
Minimum Order Quantity:
20 PCS
Price:
Negotiable
Payment Terms:
T/T
Supply Ability:
10000 pcs/month
Specifications
| Net Weight: | 1.55 Kg | Compatible Engine: | ISUZU 4JG1 |
| Extended Engine Compatibility: | ISUZU 4JA1, 4JB1, 4JG2 | Compatible Models: | ISUZU NHR, NKR, NPR |
| Compatible Equipment: | Hitachi ZX70, ZX80 Excavators | Installation Position: | Engine Front / Belt-driven Via Pulley |
| Includes: | Mounting Gasket | HS Code: | 841330000 |
| High Light: | With Gasket Water Pump,OEM Standard Water Pump Assembly,Compatible with 4JG1 Engine Water Pump |
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Product Description
ISUZU Water Pump 8-97123330-2 8971233302 for ZX70 ZX80 4JG1 — With Gasket OEM Standard
ISUZU Water Pump Assembly 8-97123330-2 8971233302 Compatible with 4JG1 Engine ZX70 ZX80 Excavator — With Gasket OEM Replacement
Product Overview
The ISUZU Water Pump Assembly with OEM numbers 8-97123330-2 / 8971233302 is a precision-engineered replacement designed for ISUZU 4JG1 series diesel engines, widely used in Hitachi ZX70, ZX80 excavators and NHR, NKR, NPR series trucks. This component is a core part of the engine cooling system, responsible for circulating coolant between the engine water jacket and radiator to maintain optimal operating temperature.
Numbering Note: This product number is 8-97123330-2 / 8971233302, also listed as 8-97123-330-2. It is supplied by brands including IZUMI and includes the mounting gasket.
Working Principle
The water pump is the "heart" of the engine's forced circulation cooling system, typically driven by the crankshaft via a belt and pulley. Its working principle includes:
- Coolant Circulation Drive: The pump impeller rotates at high speed inside the housing, creating centrifugal force that draws coolant from the bottom of the radiator into the pump.
- Pressurization: The impeller pressurizes the coolant and discharges it through the pump outlet into the engine cylinder block and cylinder head water jackets.
- Heat Exchange: As coolant flows through the engine water jacket, it absorbs heat from the cylinders and combustion chambers.
- Cooling Cycle: The heated coolant leaves the engine and enters the radiator, where it dissipates heat through the radiator core via ram air, then returns to the water pump to complete the cycle.
- Heater Supply: A portion of the coolant is diverted to the heater core to provide cabin heat.
Failure Symptoms
⚠️ Inspect immediately if any of these occur:
| Symptom | Probable Cause |
|---|---|
| Coolant leak or sweet smell near the water pump area | Worn water pump seal; coolant leaking from pump housing |
| Grinding or whining noise increasing with engine speed | Worn water pump bearing; increased rotational resistance |
| Temperature gauge spikes or overheating warning light | Corroded or damaged impeller; insufficient coolant flow |
| Heater blows cold at idle then warm at higher RPM | Insufficient pump flow at idle; slow coolant circulation |
| Cooling system pressure abnormal or frequent boiling over | Excessive impeller-to-housing clearance; reduced pumping efficiency |
Product Specifications
Includes: Water pump assembly + mounting gasket
Net Weight: 1.55kg
HS Code: 841330000
Compatible Engine: ISUZU 4JG1 diesel engine
Extended Engine Compatibility: ISUZU 4JA1, 4JB1, 4JG2
Compatible Models/Equipment: ISUZU NHR, NKR, NPR trucks; Hitachi ZX70, ZX80 excavators
Condition: Brand New — 100% quality inspected
Warranty: 12 months
| Part Number: | 8-97123330-2 8971233302 | Product Name: | Water Pump Assembly |
|---|---|---|---|
| Car Model: | ZX70 ZX80 | Engine Model: | 4JG1 |
| 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 Make It 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 | ||
Vehicle & Engine Compatibility
Primary Equipment Applications:
| Brand | Equipment Model | Compatible Engine | Notes |
|---|---|---|---|
| Hitachi | ZX70 | 4JG1 | Excavator |
| Hitachi | ZX80 | 4JG1 | Excavator |
| Hitachi | ZX75UR, ZX75URT, ZX75US | 4JG1 | Excavator |
| Hitachi | EX | 4JG1 | Excavator |
Primary Vehicle Applications:
| Brand | Model Series | Compatible Engine | Notes |
|---|---|---|---|
| ISUZU | NHR | 4JG1 | Light-duty truck |
| ISUZU | NKR | 4JG1 | Light-duty truck |
| ISUZU | NPR | 4JG1 | Light/medium-duty truck |
Primary Engine Applications:
| Engine Model | Primary Application |
|---|---|
| ISUZU 4JG1 | ZX70/ZX80 excavators, NHR/NKR/NPR trucks |
| ISUZU 4JA1 / 4JB1 / 4JG2 | Extended compatibility |
Extended Compatibility Note: This product is primarily designed for ISUZU 4JG1 engines. Same-series pumps are also compatible with 4JA1, 4JB1, 4JG2 engines. It also fits Hitachi ZX60, ZX75 series excavators. Please verify the engine model on the equipment nameplate before ordering.
Important Fitment Warnings
- Number Confirmation: This product number is 8-97123330-2 / 8971233302. Same series includes 8-97123330-0, 8-97123330-1 and 8971050125. Verify the specific number on the original part before ordering.
- Gasket Included: This product includes the mounting gasket — be sure to use it during installation.
- Installation Torque: Refer to ISUZU 4JG1 engine factory workshop manual for water pump mounting bolt torque specifications.
- Coolant Replacement: Replace coolant simultaneously and flush the cooling system when replacing the water pump.
- Belt Inspection: Inspect the water pump pulley and drive belt for wear — replace if necessary.
- Professional Installation: The water pump is a critical engine cooling system component — improper installation may cause engine overheating and severe damage. Professional installation is recommended.
Features & Benefits
With Gasket Included
Gasket included for convenient, reliable installation — eliminates separate gasket procurement; saves installation time.
IZUMI Brand Professional Supply
Mature production systems and extensive industry experience — provides global customers with reliable automotive parts solutions.
Precision Casting & Machining
Ensures precise impeller-to-housing fitment — provides stable, efficient coolant flow; effectively prevents engine overheating.
12-Month Warranty
Reliable after-sales protection — 12-month quality guarantee.
Broad OEM Cross-Compatibility
Replaces OEM numbers 8-97123330-2 / 8971233302; compatible with 8-97105012-5, 8971050125, 8-97028-590-0 and other cross-reference numbers — simplifies sourcing for repair shops.
Broad Equipment Compatibility
Fits Hitachi ZX70, ZX80 excavators and ISUZU NHR, NKR, NPR trucks — reduces inventory SKU count.
Quality Control & Verification
| QC Item | Inspection Method | Acceptance Criterion | Frequency |
|---|---|---|---|
| Pump housing dimensional accuracy | CMM | OEM standard size ± tolerance | Batch sampling |
| Impeller dynamic balance | Dynamic balancing machine | ISO 1940 G6.3 grade | Batch sampling |
| Mechanical seal integrity | Air/Water pressure test bench | No leakage; stable pressure retention | 100% |
| Bearing rotation smoothness | Rotation test bench | Smooth rotation; no binding; no noise | 100% |
| Material composition | Spectrometer | Per metal standard | Batch sampling |
| Visual inspection | Visual | No casting defects, burrs, or rust | 100% |
Installation & Maintenance Recommendations
IMPORTANT SAFETY NOTICE:
The water pump involves the engine cooling system. Allow the engine to cool completely (at least 30 minutes) before proceeding to prevent burns. Improper installation may cause engine overheating and severe damage. Professional installation is recommended.
The water pump involves the engine cooling system. Allow the engine to cool completely (at least 30 minutes) before proceeding to prevent burns. Improper installation may cause engine overheating and severe damage. Professional installation is recommended.
Installation Guidelines (Reference Workshop Manual):
Preparation:
- Confirm installation position and part number (8-97123330-2)
- Prepare tools: Socket wrench, torque wrench, sealant, coolant collection container
- Gasket is included — no separate purchase needed
Removing Old Water Pump (Reference Steps):
- Allow engine to cool completely.
- Disconnect battery negative cable.
- Drain coolant into a clean container (can be reused or properly disposed).
- Remove drive belt and water pump pulley.
- Remove water pump mounting bolts.
- Carefully remove the old water pump, check for old gasket residue.
Installing New Water Pump (Installation Sequence):
- Clean mounting surface: Thoroughly clean the water pump mounting surface — ensure no old gasket residue, oil, or debris.
- Install gasket: Use the included water pump gasket and apply sealant between the gasket and pump contact surface.
- Install new pump: Position the new water pump correctly and install mounting bolts.
- Pre-tighten bolts: Snug all bolts, then torque to specification (refer to ISUZU 4JG1 workshop manual).
- Install pulley & belt: Install water pump pulley and drive belt; adjust belt tension to specification.
- Fill coolant: Fill with properly mixed coolant to the correct level.
- Start test: Start engine, check for leaks, bleed air after thermostat opens, and top up coolant to correct level.
Post-Installation Checks (Mandatory):
- Leak check: Start engine and warm to operating temperature — check water pump and hose connections for coolant leaks.
- Temperature check: Confirm temperature gauge reads normal; radiator upper and lower hoses show normal temperature differential.
- Noise check: Confirm water pump operates without abnormal noise or vibration.
Maintenance Schedule
| Item | Interval | Notes |
|---|---|---|
| Coolant inspection | Every 10,000 km / each service | Check level and color; coolant should be clear and free of contaminants |
| Water pump & hose leak check | Every 20,000 km | Check pump and hose connections for coolant seepage |
| Drive belt inspection | Every 20,000 km | Check for cracks, wear, or insufficient tension |
| Coolant replacement | Every 2 years / 40,000 km | Coolant degrades over time; affects cooling performance |
| Water pump replacement | Upon symptom occurrence | — |
Packaging & Supply
| Item | Detail |
|---|---|
| Packaging | Neutral packaging or customized per customer request |
| Quantity per package | 1 pc/box (standard shipment packaging) |
| Product Net Weight | 1.55 kg |
| Brand | IZUMI |
| Place of Origin | China |
| Customization Options | OEM custom packaging / neutral packaging / private labeling |
| Minimum Order Quantity | 1 piece |
| Delivery Time | 3–7 working days |
| Warranty | 12 months |
| HS Code | 841330000 |
| Target Customers | Construction equipment parts suppliers, truck parts wholesalers, engine repair shops, fleet purchasers, export traders |
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