What is function of solid spacer & is it used in 3dx backhoe loader of jcb?

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What is function of solid spacer & is it used in 3dx backhoe loader of jcb?

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jus tell me what is the function of solid spacer & is it used in jcb 3dx backhoe loader………. i hve to submit my final report by tuesday , so pls help me………….