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EVT Fire Apparatus

F6 Allison Automatic Transmissions — practice test

Studying for F6 (Allison Automatic Transmissions)? Overhaul Prep has 239 verified F6 questions written to the current task list — in the same formats the real exam uses (direct, Technician A/B, EXCEPT and most-likely-cause). Every answer comes with a written explanation, so you learn why instead of memorising a letter.

239F6 questions
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Sample F6 questions

Straight from the bank — answers highlighted, with the explanation underneath.

In an Allison electronically controlled automatic transmission, what is the primary purpose of the torque converter lockup clutch (TCC)?

  1. Provide a direct mechanical connection between the engine and transmission input, eliminating converter slip
  2. Multiply engine torque during initial vehicle acceleration
  3. Circulate transmission fluid through the external cooler
  4. Apply the integral output retarder during downhill braking
WhyThe lockup clutch mechanically couples the converter pump and turbine for a 1:1 drive with no slip, improving efficiency and reducing heat. Torque multiplication is done by the converter and stator when the clutch is released, so that is not the lockup clutch's job.

Two technicians discuss the integral output retarder on an Allison transmission. Technician A says the retarder is a hydrodynamic device that uses transmission fluid to absorb vehicle energy and slow the truck. Technician B says because the retarder adds a large heat load, the apparatus must be equipped with an adequately sized transmission cooler. Who is correct?

  1. Technician A only
  2. Technician B only
  3. Both Technicians A and B
  4. Neither Technician
WhyThe Allison output retarder is a hydrodynamic (fluid) device that converts vehicle kinetic energy into heat in the transmission fluid, so it demands increased cooling capacity to dissipate that heat. Both statements are correct.

A midship split-shaft pumper with an Allison automatic will not complete a pump shift and the "OK TO PUMP" indicator will not illuminate. Which unmet requirement is the MOST likely cause?

  1. The transmission is not in Neutral and/or the parking brake is not set when the pump shift is attempted
  2. The output retarder is disabled
  3. The fluid level is one quart high
  4. The J1587 diagnostic datalink is disconnected
WhySplit-shaft pump engagement per NFPA 1901/1900 uses a defined interlock sequence—typically parking brake set and transmission in Neutral before the pump shift, after which the TCM commands the designated pump range. A slightly high fluid level or a diagnostic-datalink issue would not, by itself, block that interlock.

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