Gear Pumps Micro Series Installation and Running Information 9 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 in one working minute. Fluid contamination levels should be monitored by use of correct filter types. Two parameters tell which filter is most suitable: absolute filtering power and b filtering ratio. Low absolute filtering power and high b filtering ratio for small particles help ensuring good filtration. It is then very important to limit not only the size of particulate, 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 becomemore andmore efficient. The filtering system shall always ensure contamination levels not exceeding the values indicated below: Pressure <140 bar 140 to 210 bar >210 bar NAS 1638 Class 10 9 8 ISO4406 Class 19/16 18/15 17/14 Ratio bx = 75 25-40 μm 12-15 μm 6 -12 μm It is recommended to use a filtering systemhaving absolute filtering capability of 5 μmor lower in the systems using sophisticated valve slaves. Hydraulic Fluids Use specific mineral oil based hydraulic fluids of good anti-wear, anti-foaming (rapid deaeration), antioxidant, anti-corrosion and lubricating properties. Fluids should also comply with DIN 51525 and VDMA24317 standards and compliant with 11th stage of FZG test. For the standardmodels, the temperature of the fluid should be between -10°C and +80°C. Fluid kinematic viscosity ranges are of following: allowed value (upon verification) 6 to 500 cSt recommended value 10 to 100 cSt value allowed at startup <2000 cSt If fluids other than the above mentioned type are used, please always indicate type of used fluid and operating conditions so that jbj Techniques technical office can advise of possible problems with compatibility or useful life of systemparts. Inlet Pressure Under standard working conditions, intake pipe pressure is lower than atmospheric pressure. The operating inlet pressure should range between 0.7 and 3 bars (absolute). In case the pump must work with higher pressure in the intake pipe, a special “TR” version is available. Please call jbj Techniques technical office tel: +44 (0)1737 767493 or email: info@jbj.co.uk for values other than those indicated. Min. Rotation Speed Marzocchi 1P pump versatility can be perceived from the wide range of rotation speeds they can be subject to: max. values are indicated in product tables and change according to themodel, whilemin. values are as follows: Group 0.25 0.5 Size 18 24 30 36 48 60 0.5 0.75 1.0 1.3 1.6 2.0 Min. Speed (rpm) 1500 1000 800 www.jbj.co.uk/gear-pumps.html #DriveLineHarmony
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