Mitsubishi S4L2-W461ML Engine Engine

This engine also powers 10 machine(s) on Power Equipment Info.

• Mast lights off but ballast indicators on control panel are on
  Fix: 1. Mast light is too hot. Allow light to cool 10-15 minutes before restarting. 2. Faulty bulb connection. Check that the bulb is tight in the socket. 3. Bulb broken. Check for broken arc tube or outer bulb jacket, broken or loose components in bulb envelope or blackening/deposits inside tube. 4. Check the connections inside the mast junction box and each mast light housing/socket. 5. Check the mast electrical cord for damage and check the cord connections inside the control box.
• Mast lights on but the light output is low
  Fix: 1. Fixture or lens are dirty. Clean reflective surface inside fixture and both inside and outside surface of glass lens. Use mild soap and water to clean lens. Other chemicals may have an adverse effect on the glass. 2. Bulb worn due to normal use. Replace bulb. 3. Check the mast coil cord, mast junction box and mast light connections. 4. Generator output incorrect. Check the incoming voltage to the ballast. Incoming voltage should be 120V +/- 5V. If voltage is incorrect, engine speed may need to be adjusted or generator may require service. 5. Low transformer output. The voltage from the transformer should read approximately 400 VAC as the light “strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240-260 VAC. On quick disconnect models, measure across the junction box terminals when the light is unplugged. On hard wired models, remove the mast junction box cover and insert the wire probes into the connector blocks for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs to be replaced.
• Mast lights off and ballast indicators on control panel are off
  Fix: 1. Check the connections inside the control box and inside each ballast box. 2. Generator output incorrect. Check the incoming voltage to the ballast by checking the available voltage on the duplex receptacle. Incoming voltage should be 120V +/- 5V. If voltage is incorrect, the engine speed may need to be adjusted or generator may require service. 3. Low transformer output. The voltage from the transformer should read approximately 400 VAC as the light “strikes” (induces an arc), then drop and slowly rise back up to stabilize at 240-260 VAC. On quick disconnect models, measure across the junction box terminals when the light is unplugged. On hard wired models, remove the mast junction box cover and insert the wire probes into the connector blocks for the light and ground. If proper voltage is not achieved, perform capacitor check to determine if the capacitor or coil needs to be replaced.
• Mast light is too hot
  Fix: Allow light to cool 10-15 minutes before restarting.
• Faulty bulb connection
  Fix: Check that the bulb is tight in the socket.
• Bulb broken
  Fix: Check for broken arc tube or outer bulb jacket, broken or loose components in bulb envelope or blackening/deposits inside tube.

Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi S4L2-W461ML.

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: Isuzu 5864014350 Isuzu 8972599390 Mitsubishi MD623028 Mitsubishi 91B6100800 Donaldson P821575 Donaldson P822858 Wix 46438NP Wix 42985
• Fuel filter: Donaldson P550345 Ac Delco XD32
• Oil filter: Isuzu 8943687270 Mitsubishi 30A4000103 Donaldson P502007 Wix 51356 Ac Delco AC028

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

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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.