Gear Pumps GHP Series Installation and Running Information 9 www.jbj.co.uk/gear-pumps.html #DriveLineHarmony 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 andb filtering ratio. Low absolute filtering power and highbfiltering 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 Ratiobx = 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 Group GHP1 allowed value (upon verification) 6 to 500 cSt Min. Speed (rpm) 800 700 500 recommended value 10 to 100 cSt Size 6 9 10 12 13 16 20 22 25 30 34 37 40 50 For the standardmodels, the temperature of the fluid should be between -10°C and +80°C. Min. Speed (rpm) 600 500 400 The versatility of the GHP series pumps is seen from the wide range of rotation speeds they can be subject to: maximum values are indicated in product tables and change according to themodel, whileminimum values are as follows: Min. Speed (rpm) 700 Group GHP2 Inlet Pressure Group GHP3 Min. Rotation Speed value allowed at startup <2000 cSt Fluid kinematic viscosity ranges are of following: 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. 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). 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. Size 2 3 4 5 6 7 9 11 13 16 20 Size 30 33 40 50 60 66 80 94 110 120 135
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