How to Replace TB123A Washer Spanner Wrench on Whirlpool & Maytag Washers — Step-by-Step

Your Whirlpool washer's agitator won't come off, and you're stuck mid-repair without the right tool. The TB123A spanner wrench isn't something that fails — it's the essential tool that actually lets you fix the real problem: a worn agitator, broken dogs, or a stripped drive block. If you've got a direct-drive Whirlpool, Maytag, or Kenmore washer built after 1990, this specific wrench is what unlocks the agitator nut that hand-strength alone can't touch.

What You Need Before Starting

This isn't a repair — it's acquiring the right tool for washer repairs. Here's what you need:

• TB123A Spanner Wrench (the part you're getting)
• Flathead screwdriver (to pop the agitator cap)
• Rubber mallet (optional, for stubborn agitators)
• Penetrating oil (if the nut hasn't moved in 10+ years)
• Work gloves (those agitator edges are sharp)

Time Required: 5-10 minutes once you have the wrench
Difficulty: Easy

Safety First

Unplug the washer completely before starting — never work on an appliance that's still connected to power. The agitator nut you're accessing sits directly above the transmission shaft, and while there's no electrical danger at that point, sudden movement while the machine has power could cause the basket to spin unexpectedly. Also, agitator caps can pop off with surprising force, so keep your face to the side when prying them loose.

Step 1: Remove the Agitator Cap

Pop the fabric softener dispenser or decorative cap off the top of the agitator using a flathead screwdriver. On most Whirlpool and Kenmore models like the 110.20052991 or MVWX700XL1, this cap either twists counterclockwise or has a small notch where you can pry gently. Some caps are held by a single screw underneath — remove that first if present. You'll now see a 7/16" agitator bolt head staring back at you.

Step 2: Position the TB123A Spanner Wrench

The TB123A has two pins that fit into corresponding holes on the agitator nut — this isn't a standard hex bolt. Align those pins with the holes in the nut (they're usually at 180 degrees apart) and push down firmly so the wrench seats completely. If the holes are clogged with 15 years of detergent residue, use a toothpick or small screwdriver to clear them out first. The wrench only works when it's fully engaged.

Step 3: Break the Nut Loose

Turn the wrench counterclockwise — lefty-loosy still applies here. The first quarter-turn is the hardest because that nut has been torqued down at the factory and hasn't moved since 2008. If it won't budge, spray penetrating oil around the base of the agitator where it meets the tub, wait 10 minutes, then try again. You can tap the wrench handle gently with a rubber mallet to add persuasion, but don't hammer it — you're trying to loosen threads, not shear them off.

Step 4: Remove the Agitator Bolt and Lift the Agitator

Once the nut breaks free, unscrew it by hand the rest of the way and lift it out. The agitator should now pull straight up off the drive shaft. If it doesn't, it's likely stuck from years of detergent buildup or a corroded spline. Rock it gently side-to-side while pulling upward — don't yank or you might crack the plastic base. With the agitator off, you can now replace your worn agitator dogs (often the real culprit when clothes don't agitate), service the drive block, or install a new agitator assembly.

Step 5: Keep the Wrench for Future Repairs

Don't toss the TB123A in a junk drawer and forget about it. Store it with your appliance tools — you'll need it again when you reassemble everything. When reinstalling the agitator, hand-tighten the nut first, then use the spanner wrench to snug it down firmly (not gorilla-tight, just secure). Over-torquing can strip the threads on the drive shaft, which turns a $23 tool purchase into a $300 transmission job.

Why This Specific Wrench Matters

Generic socket sets won't touch this job because the agitator nut isn't a standard hex — it's a spanner-style fastener with two holes instead of flat sides. Whirlpool, Maytag, Kenmore, and GE all use variations of this design on their direct-drive top-load washers. The TB123A replaces older part numbers like TB123B, ERTB123A, AP6832671, and AP4503397, making it compatible with decades of models from the 110.10202000 Kenmore all the way up to modern Maytag Bravos units. One wrench, hundreds of compatible washers.

Frequently Asked Questions

Will the TB123A work on front-load washers?

No — this wrench is specifically for top-load washers with agitators. Front-load washers don't have agitators at all; they use a tumbling drum action instead. If you've got a Whirlpool Duet or Maytag Maxima front-loader, this tool won't apply to your machine. It's designed exclusively for direct-drive top-loaders made by Whirlpool, Kenmore, Maytag, and some GE models.

Can I use pliers instead of buying this wrench?

You can try, but you'll likely strip the holes in the agitator nut or crack the plastic around them. Pliers don't distribute force evenly across those two small holes, and one slip means you've just made the repair ten times harder. The TB123A costs $22.99 — less than a service call to fix a stripped nut you created with the wrong tool. Buy the right tool once, use it for 20 years.

How do I know if my washer needs this specific wrench?

If your washer has a center agitator (the tall post that moves clothes around) and you need to remove it, this is your wrench. Check your model number against the compatibility list — it includes hundreds of Whirlpool, Kenmore, and Maytag models from 1990 onward. If you see model numbers starting with 110. (Kenmore), MVWX (Maytag), or LSQ/WTW (Whirlpool), the TB123A will fit. When you pop the agitator cap and see two holes in the nut instead of hex flats, you've confirmed you need this exact tool.