A reaping hook lawn mower is an implement that expend a scissor - corresponding action to cut grandiloquent widow’s weeds or crop , such as hay . Earlier models were pull by horses , but with the invention of mechanised farming , versions were acquire to be attached to the rear of a tractor . Ford is just one of many manufacturers of sickle mower ; their 501 and 515 fashion model have alike features , but a few difference set them apart .
Pitman Arm
The Ford 501 is equipped with a wooden Pittman arm , which acts as a connect perch that converts the rotary gesture of the mower ’s block into the back - and - onward motion that tug the cut bar . The sickle bar on the 501 can tailor only when it is in a horizontal position . It can not cut at an slant , such as 10 level above or below horizontal . Therefore , the social unit can not be used on ditches or hillsides . Because the arm is made of wood , it will degrade if the mower is salt away outdoors . you’re able to prevent this by storing the unit inside , or removing the limb from the mower and stash away it inside .
Wobble Box
The Ford 515 apply a wobble spear drive alternatively of a Pitman arm . It is made of steel , making it durable and longer durable than the Pitman arm . The wobbling action of the box allows the sickle to turn off grass horizontally or at various angles above or below horizontal . line up the bar up to move over rocky terrain , or down to bring down crops that have been beaten down by heavy wind .
Damage Prevention
Rocks and stumps can obscure in tall grasses , causing legal injury to your mower . To prevent this , the 501 is outfit with a safety that releases the reaping hook bar , so it swings backwards when you hit a with child aim . If the cutting knife become jammed , the wooden Pitman branch breaks to prevent damage to the sickle . It ’s much cheaper to supersede the arm than to amend the cutting bar . The 515 has a outpouring - operate breakback that swings back to prevent harm to the cutting barroom and at the same time lifts the bar . The breakback is readjust by backing up the tractor .
PTO
The mogul take off ( PTO ) is what sends force from the run tractor engine to make the sickle legal community cut . The 515 mower is rate to be operated at higher PTO speeds than the 501 . For instance , when a 9 - inch drive sheath is set up on the 515 , the recommended PTO speed is 740 . The same size case on the 501 has a advocate PTO upper of 670 . Both PTO ratings urge a 4 - speed transmission system tractor to be execute in third gear .
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