20-3009 Sunstrand Motor used until 1993.
M46-4102 Sunstrand Motor since.
The Sunstrand circuit driving a T-630 is called a closed loop hydraulic system. Due to the nature of this circuit, changing of only one component in the Sunstrand circuit voids the warranty of that item.
Both motors and the pump must be replaced or overhauled at the same time. A full hydraulic system flush, filter change, hydraulic line flush, and tank cleaning is a must.
Failure to follow the above procedure can cause pre-mature failure of new components. Often failure occurs in days.
Last updated: July 10, 2007
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