| | | Mounting Information Mounting Bolts It is recommended that mounting bolts with a strength to ISO 898/1 grade 12.9 should be used for fixing cylinders to the machine or base. Mounting bolts should be torque loaded to their manufacturer's recommended figures. All spherical bearings should be re-packed with grease periodically. In unusual or severe working conditions, consult the factory regarding the suitability of the bearing chosen. Trunnions On the 320mm bore cylinder the trunnion is welded to the cylinder body. On all other bore sizes the trunnion assembly is threaded to the cylinder body and secured with a locking ring. In both cases, the trunnion pins are machined from solid. If a different requirement is needed to suit a particular application, please consult the factory. Trunnions require lubricated pillow blocks with minimum bearing clearances. Blocks should be mounted and aligned to eliminate bending moments on the trunnion pins. Cylinder Masses The following table shows the masses of MMA cylinders for each mounting style at zero stroke; a stroke adder for each 10mm of stroke can then be calculated. Where applicable, accessory masses can be added to give a gross mass for the complete assembly - see page 13. | | Servicing Features All cylinders will, at some time, need maintenance or repairs. The MMA series has been designed to make these tasks as easy as possible, by incorporating the following design features: Removable Gland - Rod bearing and rod seals can be replaced without completely dismantling the cylinder. For chevron glands, a thread is machined on the outside diameter of the seal housing to assist extraction. Chamfers at both ends of the cylinder body ease assembly of the head and cap and insertion of the piston seals. Retaining flanges are removable, allowing separate replacement of the cylinder body. High tensile bolts are used for ease of maintenance and replacement. Flanges are spaced from the head and cap to allow the bolts to be sawn through in the event of severe damage or corrosion. | | |
| | | Repairs Although MMA cylinders are designed to make on site maintenance or repairs as easy as possible, some operations should only be carried out in our factory. It is standard policy to fit a cylinder returned to the factory for repair with those replacement parts which are necessary to return it to 'as good as new' condition. Should the condition of the returned cylinder be such that the expense would exceed the cost of a new one, you will be notified. | | |