Description

Overview

Thermo King Threaded Oil Level Switch fits Thermo King engine protection systems that monitor low oil level on compatible refrigeration units. It uses a threaded installation style and suits Isuzu D201 and 2.2DI as well as Yanmar 3TNE72, 4TNE84 and 4TNE88 engine families used across SB, SLX, Advancer and T-Series applications.

When the unit loses its oil level input or reports a low oil level fault, this part restores the switch position that helps protect the engine during operation. Because Thermo King uses several different engine safety inputs across older and later units, matching the engine family and switch type matters before you order.

Features

• Threaded oil level switch for Thermo King engine protection circuits
• Suits Isuzu D201 and 2.2DI plus Yanmar 3TNE72, 4TNE84 and 4TNE88 engine families
• Used where the control system monitors low engine oil level
• Fits service work across SB, SLX, Advancer and T-Series applications

Specifications and Materials

Thermo King Threaded Oil Level Switch is a threaded oil level switch for compatible Thermo King engine applications. Match the engine family and switch style before ordering, because Thermo King also uses oil pressure switches and related harness parts on other layouts.

Part number: TK-41-4470-AM.

See the official Thermo King alarm code guide

Compatibility and Fitment

Match the engine family first, then confirm you need the threaded oil level switch rather than the oil pressure switch or a harness assembly. This part suits Isuzu D201 and 2.2DI as well as Yanmar 374, 395, 482, 486, 486E and 486V engine applications used in Thermo King service.

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. 41-4470, 414470, 20-41-4470, 20414470

Compliance and Safety

Check the actual engine oil level and the switch circuit before replacement, because a genuine low-oil condition can trigger the same protection input. Also inspect the sealing area and connector during installation so the new switch seats cleanly and the circuit stays stable in service.

Trailer Applications

Thermo King Threaded Oil Level Switch suits trailer refrigeration service where Yanmar or Isuzu-powered units rely on an oil level safety input. It appears across older SB families and later SLX or T-Series work, so technicians commonly replace it during shutdown fault tracing and engine-side electrical repairs.

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 engine and electrical service parts for older reefer fleets, so this switch sits alongside the other engine-side items commonly replaced during the same repair.

Browse Electrical parts at ICS Trailers