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© 2017 ICS®, Blount International Inc. REV072517 P/N 566594
890F4 OPERATOR MANUAL
19
CHECKING & ADJUSTING CHAIN TENSION
Unpacking & Assembly
All chains have a tendency to stretch when used. Diamond chains stretch
more than wood cutting chains because of the abrasive materials they
are cutting.
When a chain stretches to a point where the drive links are hanging
approximately 12 mm (1/2 in) to 18 mm (3/4 in) below the guidebar groove, it is
time to tension the chain.
A tight chain may rob power reducing cutting performance and increasing
chain friction, resulting in chain stretch. If the tension is set too loose the chain
could be thrown off of the bar or allow the sprocket to turn without turning the
chain which will damage the drive links.
IMPORTANT
WARNING
Improper chain tension can lead to breakage of the chain or derailing of the
chain off of the guidebar.
Check chain tension frequently and adjust if drive links of chain hang 18 mm
(3/4 in) or more below the guidebar.
CONNECTING TO HYDRAULIC SUPPLY
Assure hydraulic hoses are connected to power cutter with the proper flow
direction. The chain should travel away from the operator on the top of the bar
and return on the bottom of the bar. If hydraulic motor does not turn when
trigger is depressed, this may be an indication that the hydraulic flow direction
is likely reversed. Refer to diagram on page 13 for more details.
hydraulic flow direction