4586 hydraulic lessons learned

changed hy filter (left side motor & hy pump). cleaned o-ring carefully on cannister, tightened clamp & bubble tested for air leaks. added hy fluid until front axle sight glass full. put hy end with 3000 psi gauge in aux remotes. showed 2000 psi. cleaned pilot system relief valve (by valve stack -- behind right shoulder) check end of relief valve for dirt & check o-ring for good seat. when i opened valve cap was an air build up. was pre-venting full pressure to lift cylinder on disk. works aok now.
 

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