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undo the knurled nut on the outside of the dump cartridge, it should only be finger tight (remember this when you rebuild it).
Slide the black cartridge off the valve to reveal a big hex nut done up against the block, undo this (make sure the truck is 'dumped' all around before you start any of this mind) and slide the dump valve out of the block, take the 'o' rings off and then replace them.
it really is that simple !
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