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Functional description
19
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When the feed line (P) is pressurised from the saw
function, a reduced pressure (2.0-2.5 MPa/290-360 PSI )
from the pressure regulating valve (3) acts on the pistons
(1) and (2). The piston (1) keeps the chain tight while the
pistons (2) hold the bar holder to the tensioning device
when sawing is in process. The spring (4) delivers
auxiliary tension during the first sawing operation after
replacing the chain. The check valve (5) prevents the chain
from becoming slack from external obstructions e.g.
undergrowth
Fig. 12
Saw activated tensioning
1
Piston
2
Piston
3
Pressure regulating valve
4
Spring
5
Check valve
2.0 - 2.5MPa
290 - 362 PSI
P
T
2
1
3 4
5
