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Upgrade & Restore Your Tire Changer's Pivot Assemblies

The Special For Fastening Spider To Transmission Washer is a heavy-duty mechanical washer engineered to distribute clamping loads evenly and reduce surface friction on moving pivot points and structural joints of professional tire changers.

Regular maintenance and timely replacement of worn or scored washers are critical to preventing mechanical binding on main hinge pins and keeping assemblies pivoting smoothly.

📋 Factory Service Bulletin Guidance:

Update Date: August 2014
Subject: Table Top Bolt Deviation

Due to delivery issues from the supplier of the 8181742 table top bolt a replacement bolt & washer will be used on Rim Clamp tire changers. The replacement bolt\washer will be used beginning with serial number 1408107665. This should continue for approximately 2 weeks. The 8183159 Bolt & Washer kit will include the deviated bolt & washer until inventory of the original bolt is replenished. ATTENTION: ORIENTATION OF THE WASHER IS CRITICAL The supplied washer is used in addition to, not in place of, the 8182979 washer . This Surface Faces UP (More Ridges) This Surface Faces DOWN (Less Ridges)

Update Date: November 2017
Subject: DT MaXX Spider to Transmission Bolt Locking Pair Washer

Once Bolt (85611050) is tightened to 175 ft. lbs. the Locking Pair Washer (85611049) can separate if the Bolt is removed. If the Bolt (85611050) is removed, ensure that Locking Pair Washer is installed with the small serrations facing outwards. (see images below) Locking Pair Washer (85611049) Washer (8182979) Bolt (85611050) Small serrations Locking Pair Washer correctly installed LARGE SERRATIONS Small Serrations

Machine Location:

This washer is located directly on vertical hinge pins, swing arm pivot joints, or bead breaker arm cylinders.

Key Features & Specifications

  • Hardened Steel Body: Stamped from high-strength steel to resist flattening, warping, or scoring under heavy loads.
  • Optimal Load Distribution: Prevents structural fasteners from wearing into softer castings or aluminum blocks.
  • Rust Resistance: Zinc-plated finish provides defense against shop humidity and compressor condensation.

Complete Machine Compatibility

This universal replacement part is documented and verified to fit the following Coats® equipment models:

  • Coats 50/60/70/80/90 X-Model Series Tire Changer
  • Coats 5030 A/E Tire Changer
  • Coats 5035 A/E Tire Changer
  • Coats 5040 A/E Tire Changer
  • Coats 50Xx Series Tire Changer
  • Coats 6050 A/E/Ax/Ex Tire Changer
  • Coats 6060 Ax/Ex Tire Changer
  • Coats 6065 A/E/Ax/Ex Tire Changer
  • Coats 7Xxx Series Tire Changer (Prior 2010)
  • Coats 85613210 Maxx Model
  • Coats APX Rim Clamp Tire Changer
  • Coats Dt Maxx

Frequently Bought Together / Related Parts

These drawing-adjacent parts connect directly next to this part on your parts breakdown and assembly drawings:

🔧 Pro Installer Tip:

For moving pivot shafts, apply a thin layer of grease to both faces of the washer during installation to eliminate friction.


Alternative / Cross-Reference Part Numbers: SVI BW-1229-79 | Coats 8182979 | Distributor AM8182979

AMMCO and COATS are registered trademarks of The Coats Company. AEPN Inc. is not associated in any way with The Coats Company, Inc. Any names, symbols, numbers, and descriptions are used for reference purposes only. It is not implied that any part listed is the product of these manufacturers.

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