NPK M20C, Instruction Manual, Page: 129 / 152

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129
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TROUBLESHOOTING
TROUBLESHOOTING GUIDE FOR LOW POWER
RELIEF VALVE CHECKS
PROBLEM CAUSE CHECK REMEDY
Operating Pressure
is less than 3,625
psi ( 250 bar ).
Carrier hydraulic
circuit relief valve.
Measure the carrier
circuit relief valve with
the pressure to close
shut-off valve in the
"OFF" position.
Adjust or replace the
carrier circuit relief
valve. The setting for
the relief valve must
be 200 psi ( 14 bar ),
minimum, above the
Material Processor
operating pressure.
Material Processor
relief valves
Measure the relief
valves with the shut-
off valves on the
carrier in the
"ON"
position. Check
pressure with the
jaws fully open and
fully closed.
Setting should be
3,625 psi (250 bar).
Check relief
cartridges for
tightness.
Tighten the relief
valve cartridges.
Check relief
cartridges for mis-
adjustment.
Reset to 3,625 psi
( 250 bar ). If unable to
adjust, replace the
cartridge.
Check the o-rings
and backup rings of
the relief valve
cartridges.
Replace the o-rings
and backup rings of
both relief valve
cartridges.
Pilot check valve
assemblies.
Inspect the booster
inlet pilot check
valves for damage.
Replace the inlet pilot
check valve
assemblies if
necessary.
Swivel manifold
assembly
Check the seals
between the open
and close passages
in the swivel manifold
assembly.
Replace the seals in
the swivel manifold
assembly.
Check the land areas
for the seals in the
swivel manifold
assembly.
Repair the land area
or replace the
spindle.