How to Replace the Part AM138497 on a John Deere LT166

Written by yvonne grant
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The John Deere LT166 features a 46-inch mower deck, 16-HP Briggs and Stratton Vanguard engine. The AM138497 is the part number for the starting solenoid; the starting solenoid keeps the starter safe from an electrical surge. If the electrical system gets overcharged, the starting solenoid will burn so that the starter will not malfunction. Changing out the solenoid will take some knowledge of engine theory. You can complete this procedure in about 15 minutes.

Skill level:
Moderately Easy

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Things you need

  • 10mm wrench
  • Note pad
  • Pen
  • 13mm wrench

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Instructions

  1. 1

    Park the lawnmower on a hard, level surface. Set the parking brake and remove the key from the ignition. Raise the bonnet and disconnect the negative battery cable from the negative battery post, using the 10mm wrench.

  2. 2

    Follow the positive battery cable to the solenoid; note the two cables and two connectors position on the solenoid with the note pad and pen. Pull the two connectors off the solenoid coming from the wiring harness.

  3. 3

    Remove the nuts on the two posts on the solenoid , using the 13mm wrench, and slide off the negative and positive cables. Remove the two 13mm bolts at the back of the solenoid that holds it against the tractor frame; remove the old solenoid.

  4. 4

    Slide the new solenoid into place and tighten the two bolts that hold the solenoid against the frame. Slide the cables onto the posts, referring to the diagram drawn in step 2. Tighten the 13mm nuts over the top of the cables; push the connectors onto the tabs on the solenoid. Refer to the diagram from step 2. Reinstall the negative cable onto the battery with the 10mm wrench.

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