NPK M20C, Instruction Manual, Page: 140 / 152

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140
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TROUBLESHOOTING
TEST PROCEDURE
SLOW CYLINDER SPEED
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.
Booster sequence
valve cartridge.
Observe sequence
valve operation. (See
"PRESSURE
INTENSIFIER
SEQUENCE AND
RELIEF VALVE
ACTUATION" )
Replace the
sequence valve
cartridge. ( NOTE:
The sequence valve
cartridge is not
adjustable. )
Check the o-rings
and backup rings of
the sequence valve
cartridge.
Replace the o-rings
and backup rings of
the sequence valve
cartridge.