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INSTRUCTIONS AND PARTS LIST FOR
DESCRIPTION
This unit is a five-piston axial type piston pump designed for heavy-duty industrial application up
to 6000 psi continuous and 8000 psi intermittent. The pump should be coupled directly to the
driving source and can be rotated in either direction.
TYPICAL VARIABLE VOLUME CONTROLS
A) Stem Control – with control stem out (return spring), output delivery is zero gpm –
pushing in on the control stem increases pump delivery from zero to the maximum gpm.
B) Knob Control – with the control knob adjusted out (counterclockwise rotation), output
delivery is zero gpm – turning the control knob clockwise increases pump delivery from
zero to the maximum gpm.
C) Pressure Compensated – circuit operating pressure is controlled by setting the
compensator valve mounted on the pump. Turning the knob clockwise increases circuit
pressure, counterclockwise decreases circuit pressure. Output delivery of the pump at
zero circuit pressure is maximum gpm – when circuit pressure reaches the setting of the
compensator valve pump output automatically decreases to supply the exact flow rate
required by the system.
INSTALLATION
1) Rotation – Pump shaft rotation can be in either direction.
2) Shaft Alignment & Pump Mounting – The alignment of the pump and motor is critical,
having a direct relation to pump bearing, shaft seal and coupling life.
3) Fluid Connections – Pressure and intake line piping should correspond to port size to
keep fluid velocities in an acceptable range. Do not bush down to a smaller size.
4) Safety Valves – The high-pressure line must have a relief valve close to the high-
pressure outlet to prevent damage to the pump. In a circuit using the pressure
compensated pump, the relief valve should be set several hundred psi above the
compensator pressure to minimize transient pressures due to compensator overtravel.
5) Filtration – Cleanliness of fluid and components is of extreme importance in high-
pressure hydraulic circuits. A suction strainer of 140 microns or less and a twice pump
capacity should be used in the pump inlet line.
905050
MODEL 50-101
3/4 GPM Hydraulic Pump
Variable Volume – Step Control
27
Dake Corporation
724 Robbins Road
Grand Haven, MI 49417
www.dakecorp.com
REV112019
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