Hands-on Training Syllabus - QUEST Lower Unit

Click here to download the QUEST Lower Unit Hands-On Worksheet.

Description

In this session you will:

  • Access, remove, and reinstall the Motor Invertor Board
  • Access, remove and reinstall the Sonar End (both DSC and MSI should be viewed)
  • Properly Install and remove a Shaft Assembly.

Hands-on Tasks:

  • Remove the 4 bolts retaining the Sonar/Plain End of the motor assembly to access the Transducer and Invertor Board.
  • Remove and reinstall the inverter board, note that this is possible to service without removing the
    motor shaft.
  • Note that Transducer Replacement does require shaft removal.
  • Install the Shaft on the Motor, then remove the shaft from the motor.
    • Apply Proper Torque to the bolts using a torque Wrench
    • Simulate Loctite use.

Key Concepts:

  • Access to the invertor is relatively easy
  • Direct testing of the Lower Unit is not possible, it must be connected to a functioning control board supplying power to the invertor and an invertor com signal.
    • Invertor replacement based on error code
  • Transducer replacement does require removing the shaft to unroute the wire
  • Even torque on the screws securing the locking collar is critical to maintaining a seal.
  • Ulterra/Instinct gets a different locking collar than Terrova and Ultrex.
  • Shaft can be shipped separate of the lower unit.
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