JLG® telehandler models equipped with the ZF TSC transmission are also equipped with a thermal bypass valve in the cooling circuit to facilitate faster warm-up of the transmission. When the transmission cooling circuit is below operating temperature, this valve may be fully or partially closed, affecting the amount of fluid in the transmission. It is necessary to check the fluid level with the valve fully open to ensure the proper amount of fluid is present in the system. Improper fluid levels can contribute to premature failure of the transmission.
Download the ZF Transmission Fluid Level Check PDF (163KB PDF) for step-by-step instructions.
Please contact your Regional Service Manager or a JLG® service representative if further information is required.