Operating instructions Maximum speed: the maximum speeds given in this catalogue are valid for an atmospheric pressure of 1 bar (14.7psi), fluid viscosity between 10 to 65 cSt., and ambient temperature in the range of +30°C to +50°C. Sustained excess speed causes a rapid deterioration of the internal components reducing the lifetime of the cartridge. Minimum speed: In general, the min. speed for all pumps is 400 rpm. However, it is possible to operate at lower speeds with certain pump configurations and with appropriate operating temperatures. Inlet pressure: the inlet pressure, measured at the inlet port, should remain within the prescribed limits. Note that pressures lower than minimum limit cause cavitation and pressures above the maximum limit cause abnormal loads on the shaft and the bearings. In both cases this causes a significant reduction in the lifetime of the cartridge. Maximum outlet pressure: the maximum continuos outlet pressure is different for each type of fluid used as can be seen from the corresponding diagrams. If fluid viscosity, pump speed and contamination level are respected, an intermittent pressure of +15% is permissible for a maximum time of 80% of the duty cycle lasting 15 minutes. For longer duty cycles, please consult our technical office. Mounting and drive connections: consider the following indications when preparing the installation drawings: Pump with keyed shaft: the pump with keyed shaft has to be coupled axially and by means of a flexible coupling to the drive; the clearance between the keyed shaft and the corresponding sleeve coupling has to be between 0.004 and 0.030 mm; avoid axial and radial loads on the shaft; the mounting flange has to be perpendicular to the drive shaft, with a maximum error of 0.18 mm every 100 mm. Pump with splined shaft: the female spline must be hardened (30 to 45 R.C.) and should be free to float to find its own center; the clearance between splines has to be between 0.013 and 0.051 mm on the pitch diameter; the max angular misalignment between the two spline axes must less than ± 0.05 per 25 mm radius. The coupling spline must be lubricated with grease or similar lubricant. Hydraulic circuit: always install a pressure relief valve on the supply line to prevent the pressure from exceeding the allowed maximum. Normally, it is set in accordance with the weakest component in the system. (In the case where it is the pump, set the valve to a pressure 15% higher than the maximum pressure rating of the pump.) Inlet line tubing must have the sections that permits a fluid velocity between 0.5 and 1.9 m/sec. It is advisable to keep the tube connecting the pumpto the reservoir as short possible. Particular care has to be taken with the inlet line which must be hermetically sealed to avoid entraining air into the circuit; this varies the characteristics of the hydraulic fluid causing the operating parts to become damaged. Filtration: the inlet line filter must have a flow rate capacity that is higher than that of the pump at its maximum operating speed. The use of a filter by-pass is recommended for cold starts and should avoid the filter become clogged. Proper maintenance of the filter elements are essential for the correct operation of the entire system. In normal conditions replace the filter element after the first 50 hours of operation. Subsequently, replace it at least every 500 hours. Regarding the filter on the return line, apply the same general conditions as for the inlet line and it should be positioned in an accessible location for ease of maintenance. Tank: if possible, the reservoir should be positioned above the pump. Otherwise, ensure that the minimum level of the fluid contained in it is higher than the pump inlet line opening. It is important to avoid draining the inlet line with the pump at standstill. The opening of the return line into the reservoir must remain below the minimum level of the fluid in the reservoir. It must not be positioned too close to the opening of the inlet line to avoid the possibility of any air bubbles passing into the inlet line. Baffles inside the reservoir may be useful in avoiding the problem. Rapid temperature changes can cause condensation on the underside of the lid of the reservoir with the formation of droplets of water that can fall into the oil. To avoid this problem it is recommended that the lid should have small vents so that the air space in the reservoir is ventilated. The vents have to be screened, though, to prevent the entry of dust or the sudden expulsion of fluid. Start-up: use the following procedure when the pump is started-up for the first time: completely fill the pump and the inlet line with fluid; start the motor at lower speed for approximately one second a number of times at regular intervals of approximately 2 or 3 seconds until the noise level reduces, thereby confirming that it has been primed; with a manometer check to ensure that the outlet pressure increases slightly; once the pump has been primed, maintain low pressure levels activating all parts of the circuit a number of times until air bubbles disappear completely from the return line to the reservoir. This procedure should be carefully applied because any residual air inside the pump can quickly cause the rotor to seize. After long stops (>1 week) the start up procedure must be repeated. Cold starting: when starting the pump, especially with low ambient temperatures, operate with moderate speed and pressure until the average temperature in the entire circuit is within the given limits. Make sure the fluid viscosity is within the limits, by consulting the specific pump model in this catalogue. Vertical installation: The pump cannot work in vertical position (vertical shaft), unless the hydraulic circuit is equipped by devices to fill the pump completely before each starting. The information provided in this catalogue is subject to change without notice. Hydraulic Vane Pumps High Pressure Pump HD Series 16 www.jbj.co.uk/vane-pumps.html #DriveLineHarmony
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