Description

Overview

Optibelt Water Pump Belt Thermo King T-Series drives the water pump on matched Thermo King refrigeration units using Yanmar TK370 or TK376 engines. It matters because coolant flow depends on steady belt drive, so a worn belt can slip, squeal, or leave the engine running hotter than it should during refrigeration service.

Features

• Fits matched T-1080R, T-1200R, and Spectrum water pump applications shown for this belt.
• Matches TK370 and TK376 engine families used across supported T-Series units.
• Works as the Optibelt version of this application, which suits buyers who want the branded replacement rather than a generic option.
• Also worth checking the other drive belts at the same time, especially if the removed belt shows glazing, cracking, or edge wear.

Specifications and Materials

Optibelt Water Pump Belt Thermo King T-Series suits the engine water pump drive on matched T-Series units, so buyers should keep it with the cooling-side belt path rather than the standby or compressor positions. Part number: TK-78-1736-OP.

For T-Series operating context, see the manufacturer technical guide

Compatibility and Fitment

Check the unit model, engine family, and belt position before ordering, because T-Series units can use different belts across the water pump, engine-to-motor, and compressor drives. This cross-reference listing means this part is a suitable replacement for the part numbers and applications shown. Some changes in installation may be required. 78-1736, 781736, 781-736, 13-0403, 130403, 13-403, 13403, CP10532, 10532, 2020B40H09, 2045B55H30, 242025B30, 78-0336, 780336, 78-336, 78336, 78-1340, 781340, 25132003000

Compliance and Safety

Shut the unit down before service, because hands and tools sit close to moving pulleys, fans, and engine hardware in this belt area. After fitting the belt, check alignment and tension, then recheck it after the initial run period if the old belt left dust, noise, or polished sidewalls.

Trailer Applications

Optibelt Water Pump Belt Thermo King T-Series supports front-mounted T-Series refrigeration units on truck bodies that use TK370 or TK376 engines, including T-1080R, T-1200R, and Spectrum variants. It belongs in water pump belt service work, so it fits jobs where the cooling-side drive belt has worn out but the pulleys and water pump still turn freely.

Cross-reference and Suitability

This part cross-references to or suits the following equivalent part numbers and compatible alternatives:

Why Choose ICS Trailers

ICS Trailers carries Thermo King service parts used in refrigeration repairs, so buyers can pick up this water pump belt alongside the other drive belts often checked in the same job. Browse Thermo King parts at ICS Trailers