Use of a flexible coupling is recommended to accommodate any slight misalignment of the shaft and to dampen vibration. Drives should be arranged so that the shaft is protected from all axial and radial loads. The coupling should allow a minimum of 0.25 mm radial movement and should impose little as no end load.Splines must allow sufficient radial movements.Two couplings are necessary to ensure radial alignment.
The hydraulic pumps may be mounted in any position. The units are supplied with either two or four bolt flanges and with a spigot for location. The fixture that receives the mounting flange spigot should have a 1mm 45-degree chamfer to ensure proper installation. To minimize vibration, which can be transmitted to the pump by rigid pipe runs, it is good practice to use flexible hose immediately connected to the unit ports.
The suction line must be as large as possible and should be free from sharp bends to prevent excessive suction head, which should in no case exceed 190 mm of Mercury (0.24 barbelow) atmospheric pressures. The system should be designed to prevent entry of air, and a positive head of oil should be maintained wherever possible.
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