Description

Overview

Optibelt Alternator Water Pump Belt suits selected Thermo King SB refrigeration units that use the alternator to water pump drive layout. It covers SB-III applications and also suits SB-110, SB-200, SB-300 and SB-400 units with Yanmar 482, 486 and Tier 2 engines. Because this belt drives key front-end accessories, belt condition matters when you want steady charging and coolant circulation without slip or belt noise.

Features

• Fits the alternator to water pump belt path on selected Thermo King SB units
• Covers Yanmar 482, 486 and Tier 2 engine applications across the listed SB models
• Supports replacement when the existing belt shows cracking, glazing or edge wear
• Helps buyers match the correct front drive belt before ordering

Specifications and Materials

Optibelt Alternator Water Pump Belt fits the front accessory drive position between the alternator and water pump on the listed Thermo King applications. It suits belt replacement work where the drive layout matches this SB configuration, so checking the belt path first matters. Part number: TK-78-1341-OP.

Thermo King belts guide

Compatibility and Fitment

Check the unit family, engine and belt position before ordering, because these systems use more than one front drive belt across the range. 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. 78-1341, 781341, 781-341, 78-1109, 781109, 781-109, CP10703, 10703, CP 10703

Compliance and Safety

Inspect pulley alignment and belt tension during installation, because a misaligned pulley can shorten belt life quickly. After fitting, make sure the belt sits properly in the pulley grooves, then recheck tension after initial run time if the service procedure calls for it.

Trailer Applications

This belt suits reefer servicing on trailer units that run the alternator and water pump from the same front drive arrangement. It also makes sense when workshops replace worn SB belts during cooling system or charging system work, because access often overlaps and belt wear usually shows up before failure.

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 stocks Thermo King service parts for transport refrigeration work, so this belt sits alongside the drive components commonly replaced on SB units. Browse Thermo King parts at ICS Trailers