Isuzu 4LE2TAGV-08 Engine

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• Unit starts but stumbles and dies
  Cause: Low ambient temperature, Intake heat inoperable, Air in fuel lines, High coolant temperature shutdown
  Fix: Verify if ambient temperature is within unit limits., Inspect engine air inlet heater function., Purge air from fuel lines., Allow engine to cool. Check coolant level in radiator. Add coolant level if needed., Inspect radiator shroud and ducting for blockage and remove any foreign matter., Inspect for visible leaks. Check tension of water pump drive belt., Contact a GMASD to replace., Remove load on generator and restart engine. Check coolant temperature and shut engine down immediately if it starts to overheat.
• Unit cranks but does not start
  Cause: Low fuel level, Restricted air filter, Fuel flow obstructed, Air in fuel system, Glow plug(s) inoperable
  Fix: Verify fuel level in tank., Inspect air filter for blockage., Inspect fuel supply hose from tank to fuel filter for cracks and abrasion., Check fuel pump operation., Purge air from fuel system., See the OEM engine manual for more information.
• One or more lights do not turn on
  Cause: Light breaker tripped.
  Fix: Inspect light breakers.
• Mast lights off, checking inside control box
  Cause: Loose lighting connections
  Fix: Inspect the connections inside the control box.
• Loose mast cable connector
  Fix: Verify outside connector is connected properly to inside control box.
• Lights not turned on
  Cause: Inspect electronic control to see if lights are on. Turn lights on.
  Fix: Turn lights on. If problems continue, contact Generac Mobile at 1-800-926-9768 for assistance.
• Generator output incorrect
  Fix: Check the incoming voltage to the ballast driver by checking the available voltage on the GFCI receptacle. Incoming voltage should be 120V ± 5V. If voltage is incorrect, the generator may require service.

Compiled from service & troubleshooting documentation across every generator set that uses the Isuzu 4LE2TAGV-08.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

Parts cataloged across all variants of this engine family — verify the exact part fits your specific variant and serial number before ordering.

• Air filter: Generac OE3557 Generac OE3656 Isuzu 8972319000 Isuzu 5864014350 Isuzu 8972599390 Donaldson P827653 Donaldson P821575 Donaldson P822858
• Fuel filter: Generac 69858 Isuzu 8944015310 Isuzu H132401 Donaldson P502166 Donaldson P550057 Wix 33263 Wix 33386 Ac Delco TP1231
• Oil filter: Generac 670570304 Isuzu 5876100080 Donaldson P550162 Wix 51334 Ac Delco X45

Cross-referenced via Donaldson + OEM/engine-maker interchange — options to verify against your serial number, not confirmed for every exact variant.

• Hitachi ZX40U — Excavator Compact
• Hitachi ZX50U — Excavator Compact
• Kobelco SK80 — Excavator Tracked

Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.