Slow Cycle Speed; Test Procedure - NPK M20S Instruction Manual

TROUBLESHOOTING

SLOW CYCLE SPEED

The specified cycle times of the Material Processor are controlled by the flow provided
by the hydraulic circuit of the carrier.
Processor are a direct result of the maximum published oil flow; see the "MODEL
SPECIFICATIONS" section of this instruction manual.
NOTE: If the jaws will not open or close, be sure the open and close shut-off valves
are in the "ON" position.
Tools and equipment required:
(For carriers with an NPK hydraulic installation kit installed.)
Pressure gauge (g8f): 5000 psi (350 bar).
Test port adapter (g20): to fit #4 SAE female port in NPK shut-off valve (k4).
Test hose (t81): 5000 psi (350 bar) rated.
Loading type hydraulic flow meter (t36): 100 gpm (380 l/m) hydraulic flow capacity.

TEST PROCEDURE

Install a pressure gauge into the test port of the jaw close circuit (left shut-off valve as
seen from the operator's position).
Measure the attachment operating pressure.
PROBLEM
Slow cylinder
speed. Operating
pressure is at 3,625
psi (250 bar), but
the intensifier does
not click.
Fully stroke the Material Processor cylinders.
SLOW CYLINDER SPEED
CAUSE
Carrier flow setting
is set too low.
Material Processor
cylinders
The published cycle times of the Material
CHECK
Check flow output of
Material Processor
hydraulic circuit at
1000 psi (69 bar).
Check piston rings in
Material Processor
cylinders
- -
139
REMEDY
Adjust carrier flow
output to meet NPK
specifications.
Repair or replace the
carrier's pump.
Replace if damaged
or worn.