7 - PERIODIC SAFETY INSPECTIONS
7 - 12
INSPECTION OF THE TELESCOPIC BOOM CHAIN STRETCHING WITH SLIDE RULE "R"
It is advisable to perform the following operations every 1,000 operating hours.
This check shall not replace the compulsory inspections of the chain status in compliance with national provisions and
regulations.
Perform the following operations to check chain stretching:
- extend the machine boom completely and rest the carriage on the ground.
- stop the machine engine.
- take slide rule "R" from the pocket behind the driver's seat.
Perform the inspection as described in the example below.
• EXAMPLE
- by using slide rule "R", on the ruler side (R1), measure the pitch of chain link "A" in a point of the chain taken at random. In
this example A=19. (Fig. 1)
- by referring to the table shown on the rule face (R2), trace the real pitch "A" of the chain being inspected. In this example
the value closest to the measured one is A=19.05.
The lower line "B" indicates the number of chain links to be inspected; in this example the number of chain links to be
inspected is B=12 (Fig. 2).
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