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A new one is coming, and the old one has probably been damaged .... also I am still hobbling on crutches ! so have not been near to the lawnmower since breaking my leg!! and Ed is having to do the animals ..... and everything else so dont want to push my luck !

I am no engineer and we have not as yet taken the boss off .... but funnily enough I have also wondered that when I saw the drawing..... I have a degree of sympathy with the shop as they have not had the machine back to look at the issue, and also did not build it in the first place... only put the handle on and made sure it would start,... the amount of running it did probably was not long enough to dislodge blade

YES!! Finally got a result. I gave up with the dealer (who had said Grillo had confirmed that all the parts I had were correct) and in a final last ditch attempt sent the same photos to Grillo in Italy. Almost by return I received a brilliant long email from Paolo who said things were definitely not right. The photo of the flat face of the boss onto which the blade bolts SHOULD look like the attached drawing. As you see, mine is missing the 20mm step that centres the blade and dished washer. How on earth this could be missing from mine after 30 minutes light use, goodness knows. Mine certainly shows no evidence of any remaining lip - manufacturing fault, maybe? I don't know, but maybe the bolt wasn't torqued up to the necessary 40Nm on initial assembly and that allowed it to spin on the bolt. Anyway, they are sending me all the necessary parts: bolt, washers, boss and blade centre section. Full marks to Grillo for sorting it, even though it took me quite some time, many emails and phone calls to get there. Confidence in Grillo definitely restored. And thanks to all on here that helped.

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good practice to have an unbalance ? or not good practice

thanks, thats what we feel, ... Ed has now found an email address for the factory in Italy, so we will try and talk to them direct in the new year,... we feel it is for them to come to the same conclusion, not for us to introduce extra components to a brand new machine,.... but we do appreciate everyones thoughts on this forum... it is encouraging to find that everyone agrees with us!

... we do not think so the hole through the blade is too perfectly cut and indeed the blade is pretty hefty.... and Grillo has confirmed that the 20mm hole is correct. To be honest we were sent a new bolt and washers, but we are not convinced that it is a good engineering design, and the same issue will happen again, but in the mean time we have asked for the torque setting for bolt.

fantastic I will have a good look at that !

(such as ur bolt being fully threaded unlike to one in parts diagram) ooo I missed that....but even so it still would be a smaller diameter to that of the hole (10mm:20mm) the joy of returning the machine is that it would take 2 ferries and a 4 hour journey ....and back ! ... winter timetable might make that a 2 day journey .......

would it be possible to post the exploded diagram of the CL75 blade arrangement? I cannot access it as you need the machine's own serial number to download it .... and I would really like to know if it is different to the 62M thanks H

the machine is brand new, I collected it from the shop, took it home ready assembled. When the rain stopped(!) we started it up and I took it out in the field and it did maybe half an hour ... which was not really difficult terrain, (sheep grazed) did nt hit any protruding rocks,,,,The shop assembled it in so far as putting the handle on, all the rest was done by Grillo, my reason for starting the question was to see if anyone else had had a similar experience, or knew the set up of the blade and could say .... you are missing xyz..... something that I could go back to the shop to go back to Grillo with... I think their (the shop's) own engineers are surprised at the design,... but being able to say to Grillo that there is a definite problem as evidenced by all these other cases ..... would be really good . Pictures of part number the 196066

No there is no flange, and there is no register on part 196066...

I will try and sort out some pictures .... I have slipped and strained my ankle! so have not gone out for a few days ..... but will see if I can set a series of pictures up .....we are dealing with the shop here in Scotland as technically our contract is with them.... I appreciate your comment that the machines are robust and up to mulching through thick vegetation ...that was what I was hoping for .... When I first got it, I felt that co-ordinating the set off walking and engage blades might take a bit of practice so took it on a field well munched by sheep for decades ..... there were no protruding stones rocks etc but were a few clumps of rushes ... but these had been cut earlier in the year by a 1.2 m flail mower (own motor & towed behind a mule) so were not very thick/ tough.... I thought it might do the edges of the field where the bracken grows which I cannot cut with the flail .....it was late in the year so the bracken was not a serious challenge... but the bolt was stripped and the blade rattling long before I could get to test it out!

yes we did, but Grillo are adamant that the design is correct, a 20 mm hole with a 10mm bolt through it, All we can assume is that no-one has used such a machine on anything other than manicured lawns, despite their publicity video showing it being taken through wild verges and up steep hillsides,.... and that the washers have to be tightened up really tight so that they cannot ease off.............

parts lits 1.pdfThere is nothing going through the blade except the bolt item number 52956 of the washers underneath there are, in order from the bottom ie closest to the head of the bolt 2 washers that are 10mm id=1 with striations, (10mm id) a fat washer also 10mm id, then a bigger, dished washer that is 20 mm id ref numbers 50195, 2431, 55754... then the section of blade, and then a big boss that sits ontop of the blade 196066 which is threaded to take the bolt and is then connected to the shaft.

the manual drawing .... page 56 referred to by Paul in the woods is the 62 model that has been replaced by the 62M... I understood that it was mainly a different engine, but in fact the blade is different too,..... and as Paul said ... a 20mm blade hole on a 10mm shaft just won't work, it would be out of balance, vibrate like hell and eventually come apart....is exactly it !

I think my description got lost in the posting! ... what I typed was .....we recently bought a grillo 62M lawnmower to deal with untamed small patch of ground, after less than an hours work it was making knocking noises and onn investigation the blade was rattling on its fixings, we sent off for replacement fixings but what was sent ( in accordance with the exploded parts diagram ) was a 10mm bolt to go through the 20mm hole in the blade ( plus a couple of washers) we cannot see any way that the blade will not rattle around and wonder if anyone else has a grillo 62m and hence if we have had the wrong blade fitted to our machine,.... ? Grillo are saying it is correct, but we wonder (as we did not return the blade) if this is where the issue lies. Alternatively has anyone else experienced this problem? the point being that Grillo are saying that the parts are all correct, and we think that something has gone wrong, whether the wrong blade, a mistake in the size of the hole, a missing part that does noto have at appear on the exploded diagram or ????? !!!!. but whilst we might be able to have some sort of filler made we think that the manufacturer should be saying where they have gone wrong and putting it right! . so we were wondering if anyone else had experienced the same