Some general considerations should be made on the hydraulic sys-tem, in which the motor must be fitted. Special attention shall be devoted to hydraulic system design and assembly, especially to intake, delivery and return pipes and position of system parts (valves, filters, tanks, heat exchangers and accumulators). Proper safety devices and reliable instruments to avoid fluid turbulence, especially in return pipe to the tank, and prevent air, water and foreign bodies from entering into the system are of major importance. It is also very important to equip the hydraulic system with a proper filtering unit. Before starting the system on a continuous basis, we suggest to adopt some simple precautions: » Check for the direction of rotation of the motor to be consistent with the drive shaft of the prime mover. » Check for the proper alignment of pump shaft and motor shaft: it is necessary that the connection does not induce axial or radial loads. » Protect drive shaft seal during motor painting. Check if contact area between seal ring and shaft is clean: dust could provoke quicker wear and leakage. » Remove all dirt, chips and all foreign bodies from flanges connect-ing inlet and delivery ports. Ensure that intake and return pipes are always below fluid level and as far from each other as possible. » Install the motor below head, if possible. » Fill the motor with fluid, and turn it by hand. » At first startup, set pressure limiting valves at min. value possible. » Avoid lower rotation speed than min. allowed with pressure higher than P1. » Do not start the system at low temperatures under load conditions or after long stops (always avoid or limit load starting for motor longer life. Start the system for a few minutes and turn on all components; bleed air off the circuit its proper filling. » Check fluid level in the tank after loading all components. » Finally, gradually increase pressure, continuously check fluid and moving parts temperature, check rotation speed until you reach set operating values that shall be within the limits indicated in this catalogue. Cleaning and filtering the system It is widely known that most motors early failures are due to contaminated fluids. The extreme reduction of the tolerances required in the design of the motors and therefore their operation with minimum clearances, are heavily influenced by a fluid that is not perfectly clean. It is proved that particles circulating in the fluid act as abrasive agents, damaging the surfaces they touch and increasing the quantity of contaminant. For this reason, ensure that system is perfectly clean during startup and keep it clean for the whole operating life. Necessary interventions to check and limit contamination should be performed in a preventive and corrective way. Preventive actions include: proper cleaning of the system during assembly, deburring, eliminating the welding scum and fluid filtering before filling up. Starting contamination level of system fluid should not exceed ISO class 20/18/15 (ref. ISO 4406). Even fresh fluids might exceed this contamination level; therefore always pre-filter the fluid when filling up or topping up the system. Fit a proper tank; its capacity should be proportional to the volume displaced by the pump in one working minute. Fluid contamination level check and correction during operation can be obtained through filters that retain the particles in the fluid. Two parameters tell which filter is most suitable: absolute filtering power and β filtering ratio. Low absolute filtering power and high β filtering ratio for small particles help ensuring good filtration. It is then very important to limit not only max dimensions, but also the number of smaller particles that pass through the filter. It goes without saying that with an operating pressure increase and according to the system sophistication degree, filtering should Low Noise, Low Pulsation Gear Motor Installation Notes #DriveLineHarmony 18 PRESSURE Nas 1638 Class ISO 4406 Class Ratio βx = 75 < 140 BAR 10 21/19/16 25 - 40 μm 140 - 210 BAR 9 20/18/15 12 - 15 μm > 210 BAR 8 19/17/14 6 - 12 μm www.jbj.co.uk/gear-motors.html
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