John Deere 450G Dozer – Crawler Tractor (Fifth-Generation Power & Precision)

Description:

The John Deere 450G Dozer, produced from 1988 to the mid-1990s, marked a major leap in operator comfort, control, and precision for Deere’s mid-size crawler lineup. With a naturally aspirated 4-cylinder diesel engine, hydrostatic transmission (HST), and enhanced visibility from an updated operator station, the 450G became a go-to grading machine for contractors and municipalities.

This model was a major upgrade from the 450E, introducing electronic monitoring systems, integrated hydrostatic drive, and Deere’s signature low-effort, two-lever control system. The 450G is still widely used and supported, with a strong parts market for repairs and restoration.

Key Specifications:

• Engine:
  John Deere 4045D, 4-cylinder, 276 cu in (non-turbo)

• Horsepower:
  ~70 HP

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

• Hydraulics:
  Open-center, 15–16 GPM flow

• Operating Weight:
  ~14,500 – 15,500 lbs

• Blade Options:
  Straight, Angle, or 6-Way (PAT)

• Blade Capacity:
  Up to 1.4 cubic yards

• Undercarriage:
  Sealed and lubricated tracks, 5 bottom rollers, 12" shoes standard

Serial Number Info:

• Production Start: Around 1988

• Starting Serial Number: ~500000

• Location:
  On the left side of the machine frame, behind the track or near the operator’s station. Always confirm model and serial when ordering parts.

Key Features:

• ✅ Hydrostatic Transmission (HST):
  Twin-path hydrostatic drive for smooth, responsive control.

• ✅ Comfortable Cab Design:
  Low-effort joystick steering, improved seat, wide-open visibility.

• ✅ Reliable JD 4045D Engine:
  Simple, non-turbo 4-cylinder diesel with solid torque and fuel efficiency.

• ✅ Multi-Blade Compatibility:
  Handles finish grading, slope work, and clearing with ease.

• ✅ Service-Friendly:
  Modular components and swing-out access panels reduce downtime.

Common Parts & Replacements:

All available from Broken Tractor

• Engine Parts: Pistons, water pumps, injectors, gaskets, rebuild kits

• HST System: Hydrostatic pumps, motors, pressure relief valves

• Hydraulics: Lift cylinders, hoses, seal kits, control valves

• Undercarriage: Track chains, rollers, sprockets, adjusters

• Blade Assembly: Cutting edges, blade pins, bushings, tilt cylinders

• Electronic Monitoring: Sensors, wiring harnesses, hour meters

Maintenance Schedule:

• Engine Oil & Filter: Every 100 hours

• Fuel Filter: Every 200 hours

• Hydraulic Fluid & Filter: Every 250 hours

• HST Fluid Change: Every 500 hours

• Cooling System Flush: Every 1,000 hours

• Grease All Blade & Track Points: Weekly

Common Issues & Solutions:

• Jerky Blade or Poor Hydraulic Response:
  Likely caused by worn pump seals — rebuild with hydraulic seal kits.

• Weak Drive or HST Slip:
  Inspect and replace worn hydrostatic pump or motor — available in HST rebuild kits.

• Faulty Electrical Alerts or Gauges:
  Replace damaged sensors or wiring — check monitoring system components.

• Track Slap or Misalignment:
  Fix with new chains, adjusters, or undercarriage kits.