To adjust the pressure relief valve, remove the pump case cover and proceed in the following manner: (See Figure 21)
(1)
Loosen Lock Nut "C".
(2)
Turn Adjusting Screw "B" clockwise to increase pressure, counterclockwise to decrease pressure.
(3)
Tighten Lock Nut "C'"
Limit Collar (A) pre-set to maximum pressure to which valve should be adjusted.
Figure 21. Pressure Relief Valve
Figure 22. High Pressure Relief Valve Adjustment
for 0800 and 1000 Series Shears
CAUTION - Remember that when you reduce the holddown pressure, you cannot cut capacity without danger of the
material creeping. This will result in inaccurate shearing. As soon as you are finished using the holddown
system at reduced pressure, readjust to recommended pressure.
Drain plugs in the pump cases are the magnetic type to retain any little bits of metal that may be in the hydraulic oil;
therefore, when the hydraulic oil is drained, these plugs should be cleaned before being replaced.
23