Husqvarna K7000 Ring Workshop Manual

Also see for K 7000: Operator's manual Operator's manual Workshop manual Operator's manual Operator's manual

BASIC FUNCTION2The blade’s drive and guiding systemEccentric driveThe unique concept behind the K7000 Ring is itseccentric drive (outside the centre) and guiding of thecutter blade (A).FunctionThe drive wheel (B) which is powered by a belt drivenoff the engine, has a groove into which the blade slots.The two engagement rollers (C) exert pressure againstthe blade (from the engagement roller springs, when theknob is tightened), causing the blade to press againstthe drive wheel. The lower picture shows how the enga-gement roller flanges grip in the cutter blade’s groove.The only function of the support roller (D) is to exertcounter-pressure so that the blade is located properlyagainst the rollers without any play or clearance.With this design, the cutter blade can be guided inboth the radial and axial directions (rotating and lateralmovements). Three points (at the two engagement andsupport rollers and at the drive wheel) guide the bladeat the same time as the pressure against the drive wheelgenerates sufficient friction to drive the blade.Important for good functionThe description of the function indicates that it is parti-cularly important that the engagement rollers can moveaxially without interference from the spring force (thedirection of the arrows), so as to provide the correctpressure against the drive wheel. Corrosion or dirt thatblocks movement will cause the blade to slip against thedrive wheel. A properly greased bearing housing willreduce the risk of operational disruption.There must be zero clearance in the adjustment of theengagement and support rollers against the sides of theblade. The adjustment is to be changed when the bladeis replaced and must be checked at least once during thelife of the blade. Because the adjustment is mechanicallylocked, there is no movement once the locknuts havebeen set and tightened.WearIn comparison with a traditional centre-driven machine,the blade’s drive and engagement systems are subjectedto harder wear since the mechanical parts work con-stantly in an environment of water and slurry.Parts subject to wearThe wear-prone parts are the drive wheel, engagementrollers and support rollers (B, C and D in the figure).These parts can be quickly and easily replaced and thisjob is normally carried out by the user.IMPORTANTIn all control and adjustment work on the engagement andsupport rollers, the knobs that tensions the blade againstthe drive wheel must be screwed out to its end position.NB: The knobs must not be fully screwed to the endposition as this restricts engagement roller rotation.4ABBCC DCAABDC