John Deere 550 Dozer – Mid-Size Crawler Tractor (Original Model, No Letter)

Description:

The John Deere 550 Dozer, introduced in the early 1970s, is a rugged, gear-driven crawler built for clearing, backfilling, and slope work. Powered by a naturally aspirated 4-cylinder diesel engine with 65–70 HP, it combines a tough undercarriage with simple, mechanical controls — perfect for operators who value reliability over complexity.

Key Specifications:

• Engine:
  John Deere 219 cu in, 4-cylinder naturally aspirated diesel

• Horsepower:
  ~65–70 HP

• Transmission:
  8-speed manual (4 forward, 4 reverse)

• Hydraulics:
  Open-center system, approx. 13 GPM

• Operating Weight:
  ~14,000 – 15,000 lbs

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

• Blade Capacity:
  Up to 1.3 cubic yards

• Undercarriage:
  5 bottom rollers, 12" shoes, optional SALT track system

Serial Number Information:

• Production Start: ~1971

• Location:
  Serial number plate is mounted on the left side of the mainframe, near the front track or clutch housing. Verify before ordering parts.

Key Features:

• ✅ Simple, Proven Power:
  The non-turbo 219 engine is easy to rebuild and long-lasting.

• ✅ Mechanical Transmission:
  Manual 8-speed system offers full torque control and easy servicing.

• ✅ Blade Versatility:
  Straight, angle, and 6-way options handle finish grading, clearing, and slope work.

• ✅ Minimal Electronics:
  No computer diagnostics — just straightforward mechanics.

• ✅ Tough Undercarriage:
  Built for years of service in muddy, rocky, and abrasive terrain.

Common Replacement Parts:

Available at Broken Tractor

• Engine: Pistons, sleeves, gaskets, water pump, fuel injectors

• Clutch & Transmission: Pressure plates, clutch discs, bearings, gear shafts

• Hydraulics: Blade cylinders, hoses, valve bodies, seal kits

• Undercarriage: Track chains, rollers, sprockets, recoil springs, idlers

• Blade Components: Pins, bushings, tilt cylinders, cutting edges

Maintenance Schedule:

• Engine Oil & Filter: Every 100 hours

• Fuel Filter: Every 200 hours

• Transmission Fluid: Every 250 hours

• Hydraulic System Service: Every 250 hours

• Cooling System Flush: Every 1,000 hours

• Track Adjustment & Greasing: Weekly

Common Issues & Solutions:

• Stiff Steering or Poor Turn Response:
  Worn clutch discs or linkage — rebuild with steering clutch kits.

• Blade Sag or Drift:
  Caused by leaky lift cylinders — fix with hydraulic seal kits.

• Track Slap or Undercarriage Wear:
  Replace worn rollers or adjusters with undercarriage components.

• Hard Starting or Loss of Power:
  Inspect injectors and replace filters — fuel system parts available.