Oil Maintenance Procedures for Residential IHT units with External Expansion Tank
Designed to be trouble-free
Normally the Residential IHT (K46), which is featured in many tractor & rider models, does not require any servicing for the life of the vehicle. However, if there is a desire to check or replace oil, it may be necessary to remove the transaxle from the vehicle to access the black cap located under the pulley and fan. Due to the design of our units.
First, remove the transaxle from the vehicle following OEM instructions. After placing the transaxle on a bench surface remove the fan & pulley and pry open the black cap and remove magnet (see Fig #1). Invert transaxle to allow the oil to drain from case through the port under the black cap.
Refill transmission case with oil through same port to near top of the case. Tuff Torq® recommends refilling transmission with Tuff Torq® hydrostatic oil, available from our service and aftermarket department.
Reinstall magnet & cap. While reinstalling the fan & pulley on drive shaft be sure to place all components in the same order as they were removed.
In heavy usage applications, oil changing is recommended after the 1st 50 hours of operation and every 200 hours, thereafter. The filter should never require changing unless the transaxle is removed from the tractor or rider and opened for repairs.
Finally, after purging the transaxle of air, add additional oil through tank opening (under vent valve) to the recommended oil level. (see Figure #2 below for recommended oil level).
For more information, or to order your service parts and accessories, please visit our service website here. For technical support, you can call our service team at (866) 572-3441.
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