Range slave air valve kit for Eaton Fuller RTLOF-18718B 18-speeds with 1/8 in NPT ports; replaces Fuller K-2424 when the truck won't shift range.
A replacement range slave valve kit for Eaton Fuller manual transmissions, built to the Fuller K-2424 pattern and listed for the RTLOF-18718B 18-speed. The kit includes the slave valve body, the mounting gasket and four mounting bolts. Air ports are 1/8 in NPT.
The slave valve takes the air signal from the range selector on the shift knob and sends shop air to the range cylinder to shift between low and high range. When it fails, the truck will not shift range, shifts range slowly, gets stuck in low or high, or you hear a steady air leak at the side of the transmission.
On the truck: drain the air system, disconnect and tag the air lines, and unbolt the old valve from the transmission case. Clean the mounting surface, install the new gasket and valve with the supplied bolts, reconnect the lines to the correct ports, then build air pressure and check for leaks and a clean range shift before the truck goes back in service.
Cross references: Fuller K-2424, Navistar 1693-397-C, Volvo 28414-5009, Mack 3088-K-2424, Freightliner FUL K2424, Timken M13K-2424. Check the part number on your existing valve before ordering.
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