Drive Belt 78603 78-603 for Thermo-King SB190 SB200 SB210 SB230 SB310

Drive Belt 78603 78-603 for Thermo-King

This drive belt replaces OEM cross-reference numbers 78603 and 78-603 for Thermo-King SB series refrigeration units, transferring power from the engine to the compressor and fan components.

Overview

The drive belt 78603/78-603 is a high-tensile, multi-ribbed belt engineered specifically for Thermo-King SB190, SB200, SB210, SB230, and SB310 transport refrigeration systems. It ensures reliable power transmission under continuous heavy-load operation, making it a direct replacement for worn or failed belts in these units.

Built For Performance

• Constructed with aramid-reinforced tensile cords for exceptional strength and stretch resistance
• Wrapped edges reduce edge cord fraying and extend belt life
• Heat- and oil-resistant rubber compound withstands under-hood temperatures and exposure
• Precise length and rib profile match original Thermo-King dimensions for proper tensioning
• Runs quietly with minimal vibration, reducing strain on pulleys and bearings

Fits These Machines

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

On-The-Job Use

• Used in reefer trailer and truck refrigeration units for perishable cargo transport
• Installed during scheduled maintenance of Thermo-King SB series belt drives
• Commonly replaced when belt shows cracks, glazing, or chirping noise during operation
• Suitable for both roadside service bay and fleet depot replacement

Specs At A Glance

Good To Know

Q: Does this belt fit any non-Thermo-King models? A: This drive belt is designed for Thermo-King SB series units only; consult your equipment manual for OEM part cross-reference before use.

Q: How often should the drive belt be inspected? A: Check belt tension and condition every 500 hours of operation or during routine service intervals to avoid unexpected downtime.

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