Idle Gear Shaft 8-97312315-2 8973123152 For ISUZU UC 4JJ1 4JK1 Hitachi JCB

Features & Advantages 

• OE Quality: Manufactured to strict ISUZU dimensional and material specifications for perfect fit and function.

• High-Strength Forged Steel: Durable alloy steel withstands high radial loads and continuous rotation.

• Hardened Bearing Surface: Heat-treated and precision-ground shaft surface ensures smooth idle gear rotation and exceptional wear resistance.

• Precision-Machined: Exact dimensions and tolerances ensure proper alignment and correct gear backlash.

• Restores Engine Timing: Eliminates timing gear noise and performance issues caused by a worn or damaged shaft.

• Direct Replacement: Matches OE shaft dimensions and mounting configuration for simple installation.

• Long Service Life: Engineered for heavy-duty commercial diesel engine applications.

• Essential Engine Component: Critical for maintaining proper idle gear support and engine timing.

• Wide Compatibility: Suitable for ISUZU trucks and a wide range of construction and industrial equipment using 4JJ1 and 4JK1 engines.

• Cost-Effective Repair: Affordable replacement that prevents costly timing gear and engine damage. 

  

Vehicle & Engine Compatibility

This idle gear shaft is specifically designed for ISUZU vehicles and equipment using the 4JJ1 and 4JK1 engine family. Common applications include:

ISUZU Applications:

• ISUZU UC Series (Light-Duty Trucks and Commercial Vehicles)

• ISUZU ELF, N-Series (with 4JJ1/4JK1 engine)

• ISUZU D-MAX, MU-X (with 4JJ1/4JK1 engine)

Construction & Industrial Equipment:

• Hitachi Excavators: ZX110-3, ZX120-3, ZX130-3, ZX135US-3, ZX140W-3, ZX160LC-3, ZX180LC-3

• JCB Excavators: JS130, JS145, JS160, JS180, JZ140

• Case Excavators: CX130B, CX135C, CX145C, CX160C, CX180

• Kobelco Excavators: SK55, SK60, SK70

• Sumitomo Excavators: SH120-5, SH160-5

• Takeuchi Excavators: TB070, TB1140

• Denyo Generators: DCA-45, DCA-70

• Hidromek: HMK140, HMK140W

• IHI: IC50

• LBX: 130, 135, 160

• Airman: AX55, AX60, SDG60

• Nippon Sharyo: DGS70

Engine Specifications:

• ISUZU 4JJ1 — 3.0L Inline-4 Turbo Diesel

• ISUZU 4JK1 — 2.5L Inline-4 Turbo Diesel

Installation Notes

Professional engine builder or mechanic installation is strongly recommended:

1. Ensure engine is cool – Allow the engine to cool completely before disassembly.

2. Disconnect battery – Always disconnect the negative terminal before working.

3. Drain engine oil – Drain the engine oil into a suitable container.

4. Remove timing gear cover – Remove the timing gear cover to access the idle gear and shaft.

5. Remove the idle gear – Remove the retaining clip, washer, or bolt securing the idle gear to the shaft; withdraw the idle gear.

6. Remove the old idle gear shaft – Using a proper puller or press, carefully remove the old shaft from the engine block; note the orientation and any shims or spacers.

7. Clean and inspect – Clean the shaft bore, idle gear bushing, and related components; inspect for wear, scoring, or damage; replace if necessary.

8. Install the new idle gear shaft – Press or drive the new shaft into the engine block using a proper driver; ensure it is fully seated and properly aligned.

9. Install the idle gear – Install the idle gear over the shaft with the correct orientation; install the retaining clip, washer, or bolt.

10. Check gear backlash – Verify proper backlash between the idle gear and its mating gears (crankshaft, camshaft, or injection pump gear) using a dial indicator or feeler gauge.

11. Reinstall timing gear cover – Install a new gasket and reinstall the timing gear cover; torque bolts to specification.

12. Refill with engine oil – Fill with the correct grade and quantity of engine oil.

13. Start and test – Start the engine; listen for abnormal timing gear noise and verify proper engine operation.

14. Road test / Operational test – Test the vehicle or equipment to verify proper engine performance and no abnormal noise or vibration.

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