PALAZZANI RAGNO TSJ 30.1, Руководство по эксплуатации и безопасности

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Pag. 101 OM5055_US
5.12. CHAIN CHECK
The chains for the extension of the telescopic extensions are of the Fleyer type specially
designed for this job; for safety reasons they are mounted in pairs with separate attachments
and a device that ensures almost the same pull on the two chains. As safety-related elements,
chains require scheduled maintenance and periodic checks on a quarterly basis.
Maintenance
For correct operation of the chains and the coupled sliding elements, adequate lubrication
conditions must always be maintained.
To lubricate the chains, extend the arm completely horizontally, taking care to support it at
the end with an overhead crane or a crane of adequate capacity (see Fig. 5.9). In this way the
extension chains are accessible for maintenance and checks.
Fig. 5.9
The lubricant has two main tasks: Action anti-friction, protective action.
The lubricant is usually applied by brushing on the surface of the plates; it must penetrate
between one plate thickness and the other in order to also reach the wear area between the
pin and plate holes.
If the chain is contaminated by abrasive particles (eg sand), before lubricating it is necessary
to thoroughly clean it by washing with a suitable solvent. Lubricating the dirty chain would
in fact push the abrasive material into the joints, triggering abrasive wear phenomena.
Simple mineral oil with indicative viscosity ISO VG 46 - 460 can be used for lubrication.
It should be borne in mind that more viscous oils are suitable for temperatures lower
environmental levels.
A very fl uid oil penetrates the joints better, but resists less in the joints, than more viscous
lubricants. A very viscous compound, on the other hand, has diffi culty in penetrating the
joints and therefore may not allow the desired lubricating effect.
It is very important, in the case of operation in an aggressive environment (eg saline
atmosphere), to keep the surfaces well protected to limit oxidative phenomena that are
particularly dangerous for the external plates, which may be subject to cracks due to “ stress
corrosion” phenomena. In these cases, to give greater protection to the chain, after having
lubricated with relatively light oil, it is possible to spread over the entire surface highly
adhesive grease with water-repellent characteristics.