Relief Valve (Flow Control Valve) and Its Spring

• Check fluid passage of relief valve and orifice of connector for obstruction (clogged).
• Check sliding surface of relief valve for wear and damage.

Fig 1: Checking Sliding Surface Of Relief Valve

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• Check free length of relief valve spring (1).

Fig 2: Checking Free Length Of Relief Valve Spring

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Free length 

Standard: 22.0 mm (0.866 in.) 

Limit: 19.0 mm (0.748 in.) 

Replace if any defective is found.