International Harvester TD-7G Crawler Dozer

The International Harvester TD-7G Crawler Dozer is a powerful, compact track-type tractor designed for precision grading and moderate earthmoving. Built under the Dressta brand following IH’s legacy, the TD-7G offers hydrostatic power, enhanced visibility, and simple serviceability. Its rugged frame and smooth control make it a preferred choice in construction, forestry, and utility work.

Engine

• Model: International D239 or Navistar D239

• Type: 4-cylinder, naturally aspirated diesel

• Displacement: 239 cu in (3.9 L)

• Horsepower: 70 HP (net)

Transmission

• Type: Hydrostatic drive

• Control: Dual lever or joystick configuration

• Steering: Independent track control via hydrostatic system

Hydraulic System

• Pump Flow: Approx. 17 GPM

• Relief Pressure: ~2,500 PSI

• Blade Control: 6-way (PAT) or straight blade configurations

Dimensions & Performance

• Operating Weight: ~17,000 – 18,000 lbs

• Blade Width: 8 ft (PAT or straight)

• Track Width: 16–18 inches

• Ground Clearance: ~14 inches

Maintenance Essentials

• Hydraulic and hydrostatic filters: Change every 250 hours

• Final drives and planetary hubs: Inspect and refill every 500 hours

• Track tension and idler alignment are essential to reduce wear

• Frequently replaced parts:

  • TD-7G Hydrostatic Pumps

  • TD-7G Final Drive Parts

  • TD-7G Blade Lift Cylinder Seal Kits

  • TD-7G Undercarriage Components

Common Issues & Quick Fixes

• Weak blade lift or drift: Likely from worn hydraulic seals—seal kits solve the issue

• Sluggish steering or hesitation: Often indicates hydrostatic fluid contamination—flush system and inspect hydro pumps

• Track wear and misalignment: Caused by poor tensioning—adjust and replace worn idler components

Serial Number Info

• Location: Left side of frame or near operator’s platform

• Format: Typically starts with “TDT” or a six-digit numerical series for TD-7G models

Pro Tip: Use only OEM-spec hydrostatic fluid to prevent premature pump wear. Keep radiator fins clean for efficient engine cooling in forestry or dusty conditions.