International Harvester TD-8 Crawler Dozer (Original Model)

The International Harvester TD-8 (Original Model) is a mid-size crawler dozer first introduced in the late 1960s, built for light to moderate earthmoving, grading, and site prep. Known for its mechanical reliability, the original TD-8 features straightforward engineering, making it a favorite for owner-operators and easy field repairs. The early TD-8 model laid the groundwork for later versions like the TD-8C and TD-8E.

Engine

• Model: International D-239 or D-282 (varied by year)

• Type: 4-cylinder, naturally aspirated diesel

• Displacement: 239–282 cu in (3.9–4.6 L)

• Horsepower: 62–68 HP (depending on engine version)

Transmission

• Type: Powershift or gear drive (varied by configuration)

• Speeds: 3 forward, 3 reverse

• Steering: Mechanical steering clutches with brake levers

Hydraulic System

• Pump Flow: ~13–15 GPM

• Relief Pressure: ~2,000 PSI

• Blade Control: Straight or angle blade, 2 or 3-lever setup

Dimensions & Performance

• Operating Weight: ~14,000 – 15,500 lbs

• Blade Width: 6.5 to 7.5 ft depending on blade style

• Track Width: 14–16 inches

• Ground Clearance: ~13 inches

Maintenance Essentials

• Oil & fuel filters: Change every 100–150 hours

• Steering clutches: Adjust regularly to maintain consistent performance

• Track chain wear and idler alignment should be checked monthly

• Commonly replaced parts:

  • TD-8 Steering Clutch Discs

  • TD-8 Final Drive Seals

  • TD-8 Hydraulic Cylinder Kits

  • TD-8 Undercarriage Parts

Common Issues & Quick Fixes

• Hard steering or lack of response: Likely worn or glazed clutch discs—steering clutch kits restore full control

• Blade drop or drift: Caused by aging hydraulic seals—install a new seal kit

• Track sag or binding: Tension and replace worn bushings/pins as needed for proper alignment

Serial Number Info

• Location: Left rear corner of the main frame or clutch housing

• Format: May begin with “TD8” or numerical prefix based on production year