64
f. Raise the pressure to 125-140 kg/cm
2
. 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 (0.010-
0.012) mm. Replace the spool with the
spool of bigger diameter and do necessary
lapping.
Hy-tec Hydraulics
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