February 22, 1982
PRESSURE CONTROL RANGE CHART
FOR HCJ, HCS & HCF HYDRAULIC CONTROLLER
Attached is a chart showing the number and thickness of shims to use with the various springs when adjusting the
pressure control range in the hydraulic controllers. This chart can be used to change the hydraulic controllers for use with
Gresen control valves or any other directional control valves where the pressure control range is known.
EXAMPLE: Use the following procedure to re-adjust the pressure control range to 25-225 PSI:
Remove the spool assembly from the controller housing, (See attached drawing).
Remove retaining ring, (Item #2) on end of spool.
Remove spring retainer (Item #5),spring ('Item #4), and shims (Items 3,6 & 7).
Using the chart, select spring #8845-001 (0-200 PSI) which would be the nearest to the 25-225 PSI range.
Since a 25 PSI start pressure is not shown on the chart, select the number and thickness of shims to equal
.180" which is the same for both the 20 PSI and 30 PSI adjustments. (Adjustment accuracy is limited to ±
Place the proper amount of shims on the spool stem.
Slide the 8845-001 (Red) spring over the spool stem and compress the spring with the spring retainer,