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John Deere TF4045285 Engine

The John Deere TF4045285 is a 4.5 L turbo engine, producing up to 67 kW. It powers generator sets from John Deere, including the QAS 70. It holds 21 L (5.5 gal) of oil and 16 L (4.2 gal) of coolant.

Also known as: John Deere TF4045285

4.5 L
Displacement
67 kW
Gross power
21.0 L
Oil capacity
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Engine specifications

Oil capacity21.0 L
Coolant capacity16.0 L
Displacement4.5 L
Aspirationturbo
Gross power67 kW

Common problems

15
  • Winding failure
    Fix: Check windings.
  • Unstable voltage
    Cause: Speed variation in engine.
    Fix: Check regularity of rotation.
  • Rotating bridge failure
    Fix: Check diodes, disconnect cables.
  • Regulator out of setting
    Fix: Regulate stability of regulator by acting on STABILITY potentiometer.
  • No residual voltage
    Fix: Excite the alternator by applying a 12V battery voltage with a 30 W resistor in series on the + and - terminals of the electronic regulator, respecting the polarities.
  • Lower than rated voltage at load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage potentiometer.
  • Low voltage at no load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage.
  • Intervention of protection
    Fix: Check frequency/voltage regulator.
  • Intervention by protection
    Fix: Check frequency/voltage regulator.
  • Higher than rated voltage at load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage potentiometer.
  • High voltage at no load
    Cause: Voltage potentiometer out of setting.
    Fix: Reset voltage.
  • Failed regulator
    Fix: Substitute regulator.
  • Current too high, power factor lower than 0.8; speed lower than 10% of rated speed
    Cause: Failed regulator.
    Fix: Substitute regulator.
  • Alternator gives 0 Volt
    Cause: Blown fuse.
    Fix: Replace fuse.
  • After being excited the alternator still gives 0 Volt
    Cause: Connections are interrupted.
    Fix: Check connection cables, measure winding resistances and compare with values mentioned in the alternator manual.

Compiled from service & troubleshooting documentation across every generator set that uses the John Deere TF4045285.

Maintenance schedule

ItemSpecCapacityPart #Interval
Air filter—250 hr
Fuel filter—500 hr
Oil filter—2000 hr
Battery—1000 hr
Belt—2000 hr
Coolant—30 hr
Coolant filter—250 hr
OilHigh-quality, mineral, hydraulic or synthesized hydrocarbon oil with rust and oxidation inhibitors, anti-foam and anti-wear properties is recommended.—2000 hr
Spark plug—2000 hr

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

Common questions

What is the oil capacity of the John Deere TF4045285?

The John Deere TF4045285 engine has an oil capacity of 21.0 liters.

What is the displacement of the John Deere TF4045285?

The John Deere TF4045285 has a displacement of 4.5 liters.

Which generators use the John Deere TF4045285 engine?

The John Deere TF4045285 powers 1 generator set(s), including John Deere QAS 70.

How often should you change the oil in the John Deere TF4045285?

The John Deere TF4045285 oil change interval is every 2000 hours.

What is a common problem with the John Deere TF4045285 engine?

A commonly reported issue on generators using the John Deere TF4045285 is: Winding failure. Fix: Check windings..