Hy-tec Hydraulics f.
Raise the pressure to 125-140 kg/cm2. Do not raise the pressure sufficiently to blow the relief valve. Wait for 2-3 minutes and observe plugs and ports for leakage. If any of these plugs are leaky tighten it or replace if required.
g. IF oil is coming out from coupling pressure pipe, or port (9-3) ‘check valve’ is leaky, remove check valve and observe sear for any damage, observe ‘O’ ring for any cut and deformation etc. Before reassembling, change ‘O’ ring on seat. h. After reassembling, observe the pressure guage, if the pressure is coming down, and if oil is leaking from clearance between main spool and sleeve is more than (0.0100.012) mm. Replace the spool with the spool of bigger diameter and do necessary lapping.
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