Upper Fanshaft Belt 78-603 for Thermo-King SB190 SB200 SB210 SB230 SB310

Upper Fanshaft Belt for Thermo-King

This upper fanshaft belt, OEM cross-reference 78-603, drives the fan assembly on Thermo-King refrigeration units for reliable cooling performance.

Overview

This upper fanshaft belt for Thermo-King replaces worn or stretched belts that cause fan speed loss and reduced cooling. Designed specifically for Thermo-King SB-series units, this upper fanshaft belt ensures proper tension and long service life.

Built For Performance

• Precision-cut to match OEM specifications for the upper fanshaft belt
• Constructed from durable rubber compound with tensile cord reinforcement
• Resists heat, oil, and ozone for extended life in harsh environments
• Easy to install with standard hand tools

Fits These Machines

• for Thermo-King SB190
• for Thermo-King SB200
• for Thermo-King SB210
• for Thermo-King SB230
• for Thermo-King SB310

Specs At A Glance

Good To Know

Q: How often should I replace the upper fanshaft belt on my Thermo-King unit? A: Replace it at the first sign of cracking, glazing, or squealing; regular inspection every 500 hours is recommended.

Q: Does this belt fit both left and right fan positions? A: Yes, this upper fanshaft belt is used on the upper fan drive regardless of side; confirm belt routing in your unit's manual.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.