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MAYCO ST-45HRM PUMP — OPERATION & PARTS MANUAL — REV. #4 (07/16/04) — PAGE 49
ST-45 PUMP — MAINTENANCE (PUMP)
Figure 49. Accumulator Circuit Pressure Test Gauge
3000 PSI
PRESSURE TEST GAUGE
P/N: 98016
UNLOADING
VALVE CARTRIDGE
LOCK NUT
ADJUSTMENT
SCREW
Figure 50. Unloading Valve Cartridge Adjustment
SETTING PRESSURE IN THE ACCUMULATOR CIRCUIT
1. Attach a
3000 PSI test gauge
(Mayco P/N 98016) to port
G2
of the main manifold block (Figure 49).
2. Loosen the lock nut on the
unloading valve cartridge
(Figure 50) and using an allen wrench, turn the adjusting
screw
clockwise
until it is completely closed.
3. Turn the
pump control switch
(Figure 22) to the “ON”
position and run engine at 2550 RPM.
4. Loosen the lock nut for the the accumulator circuit
pilot
relief valve cartridge
(Figure 51), located at port
G4
. Using
an allen wrench, turn the adjusting screw until pressure
gauge reads 1950 PSI and tighten lock nut. Turn the engine
off and on several times to make the pressure continues to
read 1950 PSI.
5. Turn the
unloading valve cartridge
adjusting screw
counter-clockwise
until the pressure reaches
1750 PSI
on the accumulator pressure gauge (Figure 29). Start and
stop the pump several times to make sure the accumulator
circuit pressure is holding at 1750 PSI.
6. Tighten the lock nut on the unloading valve cartridge. Your
accumulator circuit pressure should now be properly
adjusted.
Figure 51. Pilot Relief Valve Cartridge Adjustment
PILOT RELIEF
VALVE CARTRIDGE
LOCK NUT
ADJUSTMENT
SCREW