A334203 Transmission Temp Switch for Doosan D15/18S5

Overview

The A334203 Switch – Transmission Temp is a Doosan replacement component that monitors the operating temperature of the transmission on selected Doosan diesel and engine-powered forklifts. A dependable transmission temperature switch warns the operator when fluid temperatures climb above normal limits, helping to protect clutches, seals, and torque converter parts from heat-related damage. If the temperature warning on your truck has stopped working or behaves erratically, replacing the faulty switch is a small investment compared with a major transmission repair. This A334203 for D15/18S5 and the other listed models restores reliable temperature monitoring and helps keep your forklift productive.

Compatibility

This transmission temp switch fits a range of Doosan counterbalance forklifts. The fitment can be grouped into the following series:

• Diesel models: D15/18S5 series and D20SC-5 (SB1089)
• Engine models: G15/18G (SB1124)
• Engine models: G15/18S5 and G20SC5 (SB1090)

OEM cross-reference numbers are not provided for this listing, so we recommend verifying fitment with the Doosan part number A334203 together with your forklift’s model and serial number. If you are unsure which switch your truck uses, share the truck data with our support team before ordering.

Quality and Reliability

Doosan designs its forklifts around carefully matched components, and the A334203 transmission temp switch is intended to meet the same expectations. Accurate temperature readings depend on a switch that responds consistently to changing fluid conditions, even under the heat, vibration, and long duty cycles common in warehouses, yards, and loading docks. Fitting the correct Doosan-specified part helps ensure that dashboard warnings and transmission protection functions behave as the manufacturer intended, reducing the risk of unnoticed overheating and unplanned downtime.

Installation and Maintenance Tips

• Park the forklift on level ground, lower the forks, and disconnect the battery before starting work.
• Allow the transmission and fluid to cool completely, then clean around the switch port to keep debris out of the system.
• Remove the old switch, install the A334203 with the appropriate sealing method, and tighten it to the specified torque.
• Inspect the connector and wiring for corrosion or damage, and confirm a secure connection.
• Refill and check the transmission fluid level, then run the truck and verify the temperature reading or warning function.
• Record the replacement in your maintenance log and inspect the switch during routine services.

Why Order from Us

for forkliftpartssearch.com specializes in forklift spare parts, including a wide range of Doosan components for diesel and engine-powered trucks. Every listing is written with clear part numbers and model fitment so you can order with confidence, and our team is available to answer fitment questions before you buy. When you need the A334203 Switch – Transmission Temp or any other Doosan replacement, we make it easy to find the right part and get your equipment back to work.