John Deere 550K Dozer – Hydrostatic Mid-Size Crawler

Description:

The John Deere 550K Dozer, introduced around 2015, is a refined, hydrostatic crawler designed for precise grading, power, and comfort. Equipped with an 85 HP Final Tier 4 turbocharged diesel engine, twin-path hydrostatic transmission, and standard 6-way PAT blade, it excels in slope work, site prep, and finish grading.

Key Specifications:

• Engine:
  John Deere PowerTech™ 4.5L PWS, Final Tier 4

• Horsepower:
  ~85 HP (net)

• Transmission:
  Hydrostatic (HST), twin-path with infinite speed control

• Hydraulics:
  Load-sensing, ~17–18 GPM

• Operating Weight:
  ~17,800 – 19,000 lbs (standard vs. LGP)

• Blade Type:
  6-Way Power-Angle-Tilt (PAT)

• Blade Capacity:
  Up to 2.4 cubic yards

• Undercarriage:
  SALT (Sealed and Lubricated Track), standard or LGP options

Serial Number Information:

• Production Start: ~2015

• Serial Number Location:
  Left side of the main frame or under the cab access step. Always verify serial number before ordering parts.

Key Features:

• ✅ Tier 4 Final PowerTech™ Engine:
  Efficient, emissions-compliant, no DPF, and solid fuel economy.

• ✅ SmartGrade™-Ready:
  Factory-enabled for 2D/3D grade control systems.

• ✅ Hydrostatic Drive:
  Smooth, responsive control with adjustable settings for operator preference.

• ✅ Premium Operator Station:
  Ergonomic seat, wide visibility, joystick control, and optional climate-controlled cab.

• ✅ Easy Maintenance Access:
  Swing-out coolers, grouped service points, and integrated diagnostics.

Common Replacement Parts:

Find them all at Broken Tractor

• Engine Parts: Filters, turbochargers, fuel pumps, gaskets

• HST System: Pumps, motors, control valves, pressure sensors

• Hydraulics: Blade lift cylinders, joystick controls, hoses, seal kits

• Undercarriage: Track chains, sprockets, rollers, adjusters, LGP shoes

• Blade Assembly: Pins, bushings, cutting edges, tilt arms

• Electronics: Grade sensors, display monitors, wiring harnesses

Maintenance Schedule:

• Engine Oil & Filter: Every 250 hours

• Fuel Filter: Every 250 hours

• Hydraulic/HST Fluids: Every 500 hours

• Coolant Flush: Every 1,000 hours

• Track & Blade Greasing: Weekly

• JDLink™ Monitoring Alerts: Daily or as needed

Common Issues & Fixes:

• Blade Lag or Hydraulic Drift:
  Worn seals or valves — fix with hydraulic seal kits

• HST Hesitation or Slipping:
  Indicates possible pump or motor wear — replace with HST components

• Turbo Power Drop:
  Replace failing turbocharger and inspect for air intake blockages

• SmartGrade Calibration Faults:
  Check and replace sensors or wiring — SmartGrade accessories available