Disclaimer: All manufacturer names, symbols, part numbers (e.g., Oilwell®, NOV®, A-1700-PT, P/N 1280026), and descriptions are used solely for cross-reference, identification, and technical compatibility purposes. Our parts are independent, high-grade aftermarket replacement components conforming to API Spec 7K and ISO 9001:2015, and are neither manufactured nor officially endorsed by the original equipment manufacturer (OEM).

The Oilwell / NOV A-1700-PT triplex mud pump (1,700 HP) operates under continuous high-torque, severe reciprocating loads, and high-pressure drilling conditions up to 7,500 PSI. The crosshead assembly endures continuous cyclic thrust forces, where inadequate lubrication, particulate abrasion, or misalignment can result in severe crosshead slide galling, wrist pin bore ovality, and costly power frame guide scoring.

Our premium aftermarket crosshead replacement for the Oilwell / NOV A-1700-PT Triplex Mud Pump (Part Number: 1280026 / 1280026-001) offers drilling contractors, overhaul machine shops, and rig supply teams a durable, 100% interchangeable solution backed by strict quality verification and rapid global dispatch.

Technical Specifications & OEM Cross-Reference

Engineering Parameter OEM Specification Aftermarket Replacement Standard Compliance & Tolerance
OEM Cross-Reference P/N 1280026 / 1280026-001 PN-1280026-EQ 100% Direct Interchangeable
Applicable Mud Pump Oilwell / NOV A-1700-PT A-1700-PT Triplex Power End Direct Drop-in Fit
Base Material Grade Ductile Iron / Alloy Cast Steel ASTM A536 Grade 80-55-06 / QT600-3 Tensile Strength ≥ 550 MPa (HB 187–255)
Wrist Pin Bore Tolerance Precision Machined ISO H7 Precision Standard Bore Concentricity & Cylindricity ≤ 0.012 mm
Sliding Guide Surface Precision Ground Cylinder Surface Finish Ra ≤ 0.8 μm Anti-Friction Honed / Wear Resistant
Max Pressure / Load Rating Continuous 7,500 PSI Service Dynamic Load Tested Designed for Heavy SPM Duty
Certification & Norms API Spec 7K API Spec 7K / ISO 9001:2015 Full EN 10204 3.1 Traceability


Manufacturing Standards & Rigorous Quality Control

  • Thermal Destressing: Raw nodular iron castings undergo controlled normalizing and stress-relief thermal cycles to eliminate internal casting stress and prevent structural deformation under continuous high-SPM cyclic load.
  • Coordinate Measuring Machine (CMM) Inspection: Pin bore diameter, extension rod mounting threads, and guide shoe cylindrical radius are 100% verified against OEM engineering drawings on multi-axis CMM equipment.
  • 100% Non-Destructive Flaw Detection: Each component undergoes Ultrasonic Testing (UT) and Magnetic Particle Testing (MT) across all high-stress transition fillets and web sections to ensure zero casting fissures or internal defects.

Maintenance & Refurbishment Installation Guidelines

  • Guide Clearance Measurement: Install the crosshead without connecting rods and verify sliding clearance against upper and lower guides using precision thickness gauges. Maintain running clearance within OEM tolerances (0.018" – 0.028" / 0.45 mm – 0.71 mm).
  • Crosshead Pin Installation: Check the crosshead pin (P/N 1280028) fit and bearing alignment. Ensure pin retainers and locking plates are torqued to specified values with thread locking compound applied.
  • Lube System Flush: Thoroughly flush crankcase oil channels, filters, and crosshead catch basins to remove abrasive grit before commissioning the mud pump under continuous load.

Frequently Asked Questions (FAQ)

Q: Is this crosshead fully compatible with original Oilwell A-1700-PT power end frames?
A: Yes. The unit matches the exact OEM envelope dimensions, pin bore diameters, and slide profiles of Oilwell Part Number 1280026 across both legacy Oilwell and modern NOV A-1700-PT triplex pumps.

Q: How does this aftermarket part lower operating costs without risking rig downtime?
A: By adhering strictly to API Spec 7K manufacturing tolerances and ASTM A536 Grade 80-55-06 ductile iron metallurgical standards, our crossheads deliver OEM-grade operational lifespans at 35–45% lower procurement costs.

Q: What certificates accompany the shipment?
A: Every shipment includes an EN 10204 3.1 Material Test Certificate, CMM dimensional verification report, MPI/UT non-destructive testing reports, and a Certificate of Origin.

Looking for Oilwell A-1700-PT Mud Pump Replacement Parts?

We supply complete power end replacement parts including crossheads, wrist pins (P/N 1280028), guide plates, connecting rods, and crankshaft assemblies with full MTC 3.1 certification.

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