Gear Motors GHM Series Installation and Running Information 9 www.jbj.co.uk/gear-motors.html #DriveLineHarmony It is recommended to use a filtering systemhaving absolute filtering capability of 5 μmor lower in the systems using sophisticated valve slaves. Ratiobx = 75 25-40 μm 12-15 μm 6 -12 μm ISO4406 Class 19/16 18/15 17/14 It is then very important to limit not only maximum 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 becomemore andmore efficient. The filtering system shall always ensure contamination levels not exceeding the values indicated below: Fluid contamination level check and correction during operation can be obtained through filters that retain the particles present in the fluid itself. Two parameters tell which filter is most suitable: absolute filtering power andbfiltering ratio. Low absolute filtering power and highbfiltering ratio for small particles help ensuring good filtration. Pressure <140 bar 140 to 210 bar >210 bar NAS 1638 Class 10 9 8 Fluid kinematic viscosity ranges are the following: If fluids other than the above mentioned ones are used, please always indicate type of used fluid and operating conditions so that jbj Techniques technical officecan consider possible problems with compatibility or useful life of systemparts. For the standardmodels, the temperature of the fluid should be between -10°C and +80°C. Size 6 9 10 12 13 16 20 22 25 30 34 37 40 Use specific mineral oil based hydraulic fluids having good anti-wear, anti-foaming (rapid deaeration), antioxidant, anti-corrosion and lubricating properties. Fluids should also comply with DIN 51525 and VDMA24317 standards and get through 11th stage of FZG test. Min. Speed (rpm) 800 700 500 value allowed at startup <2000 cSt Size 33 40 50 60 66 80 94 110 120 135 Hydraulic Fluids The versatility of the GHM series motors can be perceived 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: Group GHM1 Min. Rotation Speed Group GHM2 recommended value 10 to 100 cSt allowed value (uppon verification) 6 to 500 cSt Group GHM3 Size 4 5 6 7 9 11 13 16 Min. Speed (rpm) 700 Min. Speed (rpm) 600 500 400
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