Unitized Piston, 80mm Bore for John Deere Backhoe Loaders – AH173410

Part # AH173410

Fits Models At A Glance:

• John Deere Backhoe Loaders — Stabilizer/Outrigger & Backhoe Bucket Cylinders:
  • 310E (Stabilizer Cylinder # AH176122, AH173202, AH219499, AH219500; Bucket Cylinder # AH209080)
  • 310G — After Serial Number 902499 (Stabilizer Cylinder # AH219499, AH219500, AH176122, AH211196, AH211198)
  • 310J, 310K, 310K EP, 310L, 310SE, 310SG, 310SL, 310 P-Tier
  • 315SE, 315SK, 315SL
  • 320 P-Tier
  • 325SK, 325SL
  • 410K, 410L, 410 P-Tier
  • 710J, 710K, 710L, 710 P-Tier

Key Notes:

• Part Number: AH173410
• Weight: 2.00 lbs (0.91 kg)
• Bore Diameter: 80 mm
• Piston Dimensions: Installed width 40.74 mm, hole diameter 30.58 mm, counterbore 50 mm diameter × 15 mm deep
• Pressure Rating: Up to 5,000 PSI
• Type: Unitized piston — one-piece piston-and-seal assembly (steel body, non-metallic bearing, rubber loading ring, filled PTFE seal ring)
• Origin: Made in USA
• Cylinder Application: Backhoe stabilizer/outrigger cylinders and backhoe bucket cylinders with an 80 mm bore across the 310–710 series
• Fitment Note: This piston is sized to the bore listed above. Before ordering, match your cylinder's bore and existing piston dimensions against the specs — the same machine uses different pistons in different cylinders — note this 80 mm piston (50 mm counterbore × 30.58 mm hole) is NOT interchangeable with the 80 mm RE34085 piston (40 mm counterbore × 27.58 mm hole)

Common Use Case or Symptoms: Use when a cylinder is bypassing internally, drifting under load, or leaking past the piston — the unitized piston restores the internal seal without replacing the whole cylinder.

Why Choose Broken Tractor:

• ✅ Made in USA by PVE Products – precision-machined steel piston with the seal pre-installed
• ✅ Serves Stabilizer and Bucket Cylinders Alike – one 80 mm piston covers both applications across the 310–710 backhoe range
• ✅ Fast Shipping from a U.S.-Based Team – ready to ship from our U.S. warehouses