PAGE 84 — ST-70 — PARTS & OPERATION MANUAL — REV. #4 (05/29/07)
ST-70 — SERVICE INFORMATION
ST70 Pressure Setting Sequence
(Setting maximum pump pressure)
Step 1: Remove acorn nut from pressure compensator (located
on the top front of the Rexroth pump. The compensator
is the lower of the two valves) loosen the jam nut and
turn the allen screw clockwise until it seats.
Step 2: Loosen the jam nut located on the end of the
compensator valve.
Step 3: Turn the compensator adjustment nut (large) clockwise
until tight.
Step 4: Start the engine, loosen the jam nut located on the
maximum relief valve cartridge, small manifold port
3C. Run engine at maximum Rpm (2350), turn volume
control knob counter clockwise to maximum volume
position. Locate the electrical control panel, turn the
pump switch to the on position, next turn the test switch
on. Using an allen wrench adjust the main relief (port
3C) valve to 3500 PSI. The reading can be taken from
pump pressure gauge. Hold the allen adjusting bolt
with wrench and tighten jam nut. Using the test switch
double check the pressure reading to make sure the
setting has not changed.
Step 5: Cycle the pump at maximum Rpm’s (2350) at full
volume. Turn maximum pressure test switch on. With
an allen wrench adjust compensator allen bolt counter
clockwise until (3300) PSI is reached. Lock jam nut
and turn maximum pressure test switch off. Let pump
cycle 10 or 20 times and turn pressure test switch on to
make sure the pump is at maximum pressure. Lock the
jam nut.
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