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5.12. CHAIN CHECK
The chain for the boom extension are Fleyer type and for safety factor are fi tted in couple
with separate link and a device that assure the approximately equal tension on the chains.
The chains need of periodical maintenance; every 3 month.
Maintenance
For proper operation of the chains and moving parts must always be maintain appropriate
lubrication conditions.
To lubricate chains, extend the arm horizontally, making sure to support end with a crane
with adequate capacity (see Fig. 5.9). In this way the chains extension are available for
maintenance and inspections.
Fig. 5.9
The lubricant has two main tasks: Action anti-friction, protective action.
The lubricant is usually applied brushstrokes on the surface of the plates, it must penetrate
inside the plates to reach the area of wear between the pin and hole plates.
If on the chain there are abrasive particles (e.g. sand), before oiling must be carefully cleaned
by washing with appropriate solvent. Oiling dirty the chains means pushing the abrasive
material in the joints, triggering phenomena of abrasive wear.
The type of lubricant to use is a normal mineral oil with viscosity about ISO VG 46 – 460.
Keep in mind that more viscous oils are suitable for low ambient temperatures.
An oil very fl uid, penetrates in the joints better, but resists less, compared with more viscous
lubricants. A compound with very viscous contrast has diffi culties to penetrate the joints and
thus may not allow the lubricant effect desired.
Perform lubrication every 200 hours or every 12 weeks
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