John Deere 450J Dozer – Hydrostatic Mid-Size Crawler

Description:

The John Deere 450J Dozer (2005–mid-2010s) is a compact, hydrostatic crawler built for precision grading and slope work. It features an 80–85 HP turbocharged engine, twin-path hydrostatic drive, and a standard 6-way PAT blade. Designed with modular components, it’s easy to service and offers options like LGP tracks and electronic monitoring.

Key Specifications:

• Engine:
  John Deere 4045T turbocharged 4-cylinder diesel, Tier 3 emissions

• Horsepower:
  ~80–85 HP (net)

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

• Hydraulics:
  Load-sensing, ~16 GPM flow

• Operating Weight:
  16,000 – 18,000 lbs (varies by configuration)

• Blade Type:
  6-Way PAT (standard)

• Blade Capacity:
  Up to 1.6 cubic yards

• Undercarriage:
  Sealed and lubricated track, 5 bottom rollers per side, optional LGP shoes

Serial Number Information:

• Production Start: ~2005

• Starting Serial Number: ~150000 (check operator manual for prefix ranges)

• Location:
  Serial number plate is mounted on the left side of the machine frame, behind the front track or below the cab access ladder. Always verify before ordering parts.

Key Features:

• ✅ Turbocharged 4045T Diesel Engine:
  Delivers powerful torque with fuel efficiency and EPA Tier 3 compliance.

• ✅ Hydrostatic Transmission:
  Twin-path HST system offers precise control with no gear shifting.

• ✅ Comfort-Driven Cab:
  Quiet, sealed ROPS cab available with A/C, ergonomic controls, and low-effort blade operation.

• ✅ Standard PAT Blade:
  Full control over pitch, angle, and tilt — perfect for slope work and fine grading.

• ✅ Modular Component Layout:
  Easier service access to hydraulic pumps, HST motors, and cooling systems.

• ✅ Onboard Monitoring:
  Integrated diagnostics and system alerts reduce downtime.

Common Replacement Parts:

All available at Broken Tractor

• Engine Components: Turbocharger, water pump, injectors, rebuild kits

• HST System: Hydrostatic pumps, drive motors, pressure sensors, valves

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

• Undercarriage: Chains, rollers, sprockets, idlers, recoil springs

• Blade Assembly: Blade pins, cutting edges, tilt cylinders

• Electronics: Display modules, sensors, wiring harnesses

Maintenance Schedule:

• Engine Oil & Filter: Every 250 hours

• Fuel Filter: Every 250 hours

• HST & Hydraulic Fluid: Every 500 hours

• Coolant System Flush: Every 1,000 hours

• Track & Blade Grease Points: Weekly

• Electronic Alerts (if equipped): Check daily for faults

Common Issues & Fixes:

• Sluggish Blade or Drift:
  Usually due to worn blade cylinder seals — fix with hydraulic seal kits

• Hydrostatic Lag or Vibration:
  Could be failing drive motor or pressure imbalance — inspect and replace HST parts

• Turbo Whine or Power Loss:
  Replace damaged turbocharger or clean air intake system

• Track Misalignment or Wear:
  Worn rollers or stretched chains — restore with undercarriage rebuild kits