September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
In ZF6HP21/28/34 (Gen. 2) valve bodies, severe wear of the lubrication control valve bore results in loss of converter pressure, cooler flow and critical lube feed resulting in overheating as well as bushing, bearing and planet failures. Sonnax oversized lubrication control valve kit 95740-71K restores the function of the lube control valve and limits oil loss due to a worn bore.
Kit is NOT compatible with ZF6HP19/26/32 (Gen.1) units. To differentiate between Gen. 1 and Gen. 2 valve bodies, see ZF Identification Guide.
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
September 30, 2005
Gregg Nader
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