Perkins 1104D-E44TG1 Engine

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Shared across brands: Perkins, Terex

How to read your Perkins engine serial & model number →

• Voltage does not come up to the rated voltage
  Cause: Internal problem with the generator end
  Fix: Check for even reading across the lines, if they are not this would mean you probably have a problem with the wiring of the switch or generator. If the generator voltage reads correctly, contact the TEREX service department.
• Uneven reading between the legs when applying 24 volts to the field wires
  Fix: Recheck your wiring connections. After you have the field wire connected start the unit again and check your output voltage. It may still be necessary to flash the fields to restore residual voltage.
• TROUBLE LIGHT on CONTROL PANEL is illuminated
  Cause: Broken fan belt
  Fix: Inspect fan belt and replace as needed
• No generator output voltage
  Cause: Circuit breaker tripped
  Fix: Reset circuit breaker
• Malfunction discovered
  Fix: Identify symptoms, troubleshoot, perform repair, return to service
• Low generator output voltage
  Cause: Voltage adjustment set too low
  Fix: Adjust voltage potentiometer
• Low engine speed
  Fix: Call TEREX Service
• High generator output voltage
  Cause: Voltage adjustment potentiometer set too high
  Fix: Adjust potentiometer
• High engine speed
  Fix: Call TEREX Service
• Fluctuating or surging generator output voltage
  Fix: Check engine fuel, oil, and air filters
• Fluctuating generator output voltage stability
  Cause: Load may be the cause
  Fix: Redistribute load if possible
• Engine won't crank
  Cause: Loose battery cable
  Fix: Check cables and battery electrolyte level. Recharge as necessary
• Engine shuts down
  Cause: Oil Pressure Switch not opening automatically and TROUBLE LIGHT on
  Fix: Improper coolant use a 50/50 on
• Engine runs, but loses power under load
  Cause: Clogged fuel system
  Fix: Check fuel system

Compiled from service & troubleshooting documentation across every generator set that uses the Perkins 1104D-E44TG1.

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: Donaldson P635903 Donaldson P635979 Wix WA11994

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.