John Deere Ah139078 Metric Piston Seal Assembly

John Deere Ah139078 Metric Piston Seal Assembly is a Hercules catalog product available from WQC Parts for hydraulic cylinder, seal kit, pump, motor, valve, and heavy-equipment repair applications.

This listing uses Hercules part number JD-AH139078. Catalog description: UPA-STL/PA-80mm.

Product Details

• Hercules part number: JD-AH139078
• Product type: Piston seal or piston component
• Reference brand/application: John Deere
• Approximate weight: 1.77 lb
• Catalog data source: 2026 US Seal Catalog, 2026 US Cylinder Catalog

Catalog Application Data

• Catalog section: Unitized Pistons
• Model or series reference: 29, 08, 79, 86, 80, 00, 24, 56, 40, 01, 051, 50, 25, 288, 71
• Style / kit type: 8 A.M. To 8:00 P.M. Eastern Time; JD-AH139078
• Material / grade reference: STEEL, NYLON, NBR, PTFE
• Temperature range: -40° TO +230° F
• Pressure range: 0 TO 5,000 PSI
• Speed reference: 3 FT/SEC
• Catalog page reference: 632, 91

Use this product when your parts book, service manual, cylinder repair list, pump/motor breakdown, or existing component calls for JD-AH139078. It is intended to help restore sealing performance, reduce leakage, and support reliable equipment repair when correctly matched to the application.

Fitment Verification

Before ordering, confirm the JD-AH139078 reference against your OEM reference number, machine model, cylinder location, bore and rod size, pump/motor series, and serial-number range. Manufacturer names and part numbers are used for identification and fitment reference only. If you are unsure, compare the old parts, measurements, and parts-book callout before installation.