Cut­ting Edge

Ital­ian-de­signed, In­dian-built Cosmo Bully BPF mulcher

Farms & Farm Machinery - - Contents -

Am­ulcher can be one of the most widely-used pieces of ma­chin­ery on a farm so long as it is strong and ver­sa­tile enough to cope with cut­ting grass and tidy­ing up prun­ings – and ev­ery­thing in be­tween. The Ital­ian-de­signed Cosmo Bully range, built in In­dia, has proven up to the job since it was launched in Australia some three years ago.

Hitch­ing it up to a John Deere 6140M (def­i­nitely a bit of overkill for a 1.8-me­tre mulcher, but the most con­ve­nient trac­tor avail­able), Farms & Farm Ma­chin­ery wanted to see how the Cosmo Bully BPF 180 per­formed out in the field. Our test patch was some waste veg­etable crop need­ing to be mulched and some rough grass around the edge of the field that needed top­ping.


The Cosmo BPF range of heavy-duty mulchers of­fers three mod­els, from 1.8 me­tres to 2.25 me­tres wide. As with other Cosmo ma­chin­ery I’ve seen, first im­pres­sions are of how well the ma­chine is built, with plenty of thick folded steel plate used in the con­struc­tion and tidy weld­ing and fin­ish­ing with shiny pow­der-coated Cosmo or­ange paint.

The unit hitches to the trac­tor with a sturdy head­stock that uses CAT I or II link­age pins. There is a choice of ei­ther a fixed hole for the top link pin or a slot­ted hole to al­low ground con­tour fol­low­ing.

Also built in where the mulcher mounts to the head­stock are a hy­draulic ram and slides. This al­lows the range to side shift up to

467mm, off­set­ting it to the side of the trac­tor for hard-to-reach spots.

Along the side of the ma­chine are heavy-duty side skids to pre­vent the mulcher dig­ging into the ground. Although th­ese can be eas­ily ad­justed to set the height of the ma­chine, there are only two po­si­tions, which might not be enough for some re­quire­ments.

Hinged steel plates along the front of the mulcher cre­ate a shroud, pre­vent­ing ob­jects from fly­ing out and hit­ting the trac­tor.


Power from the trac­tor comes through a heavy-duty drive shaft to the main cen­tre gear­box. This is rated up to 100hp and the PTO in­put speed is 540rpm.

In­side the main gear­box is an in­ter­nal free­wheel clutch that pre­vents dam­age by al­low­ing the ro­tor to free­wheel when the power is dis­en­gaged.

Drive down the side of the ma­chine to the ro­tor is through four XPB sec­tion belts, pro­vid­ing a safety mech­a­nism to pre­vent dam­age to the gear­box and trac­tor if a solid ob­ject is struck.

It is great to see that although the belts are en­closed in a steel guard for safety, a slot in the cen­tre makes it easy to check belt ten­sion with a screw­driver, and it can be ad­justed, if re­quired, with­out re­mov­ing the guard.


The ro­tor is the busi­ness end of the ma­chine and uses a bal­anced steel 170mm di­am­e­ter drum. The 16 large cast-iron in­verted T-shaped flails are mounted to this. Bear­ings on each end of the ro­tor are en­closed in­side the drum, which al­lows for the max­i­mum cut­ting width and pro­tects the bear­ings from any ma­te­rial that wraps around the drum.

The de­sign of the flails lifts and then cuts the grass to en­sure an even tidy fin­ish. Ro­tor di­am­e­ter from flail tip to tip is 410mm, which gives am­ple room for ma­te­rial to move through the ma­chine.


Be­hind the flails is a row of ad­justable steel rake tines used to hold the ma­te­rial in the ma­chine un­til it is chopped to the de­sired size. The length of the rakes is eas­ily ad­justed with a sim­ple R clip and a se­ries of holes on each one in place.

The rear hood, which holds the rake tines and en­closes the ro­tor and flails, can be opened for easy ac­cess to clear block­ages or safely re­place flails. A large steel rear roller comes as stan­dard on the ma­chine. This helps to keep it fol­low­ing the ground and leaves a smooth tidy fin­ish. It is also ad­justable with two height set­tings. I’m happy to see that it has a scraper to keep it clean.


Over­all, the Cosmo Bully BPF mulcher is a rel­a­tively sim­ple but well-built ma­chine. I’m the first to ad­mit I was a lit­tle scep­ti­cal, as I’ve seen some in­fe­rior im­ported prod­uct, but to give credit where credit is due, my fears were need­less. There is plenty of steel where it is re­quired and the level of fin­ish is tidy.

It’s great to see that the drive belts on the side can eas­ily be checked and ten­sioned with the safety cover still in place, as I’ve seen plenty of mulchers where it gets re­moved once and never put back on.

The Cosmo Bully BPF mulcher is a rel­a­tively sim­ple but well-built ma­chine.


A rear roller leaves a tidy fin­ish and helps control the height of the ma­chine

5. Side skids have two height set­tings to setthe mulching level6. With four belts on the left-hand side, ten­sion can be checked and ad­justed with­out re­mov­ing the guard

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