How interchangable are disc parts?

[BoneDigger]

I realize tiller parts would be specific to a manufacturer. How specific are parts for a disc? For instance, if I bought a 5.5ft heavy duty disc made by KK with 18" discs, would I need to buy replacement parts from KK or will any other manufacturer's 18" disc, bearings, etc. work?

Also, do you think a 35HP tractor would be fine with a heavy duty 5.5ft disc with 18" discs in sandy soil? Specifically, I'm looking at the King Kutter with tube steel.

 

[Lineman North Florida]

I don't know inter-changeable KK is with other manufacture's, but I do know Agri-Supply stocks about any disc parts that you would ever need and I haven't ever seen a bearing that can't be cross referenced to other makers. I have a 6' Bush Hog harrow that I use with my little tractor which is about the size you are asking about and I have to use 4WD if I cut dirt several times and gang the harrow aggressive with it bogged to the axles, you should be just fine.

 

[jeff9366]

I concur with LINEMAN that Agri Supply is the best source for Disc Harrow parts in the Southeast USA.

Your tractor brand and model should be part of your T-B-N profile, as should your location. Tractor model tells us tractor weight, width and wheel size. Freight is a large part of total Disc parts cost.

A Box Frame, Tandem Disc Harrow with 18" diameter pans is the lightest Disc Harrow which is effective at Secondary Tillage. Meaning a Disc Harrow with 18" pans will smooth previously plowed land with several passes over the field. Early passes are a rough ride. With each additional pass ground is softer and tractor/disc unit is more likely to bog down.

Disc Harrows with 18" diameter pans have around 35 pounds implement weight bearing on each pan. It takes around 50 pounds implement weight bearing on each pan to be effective, meaning reducing furrows in one or two passes over the field. Generally, this is Discs with 20" diameter pans and larger.

The weight of your tractor, not horsepower, is the primary consideration on whether you can draw a ground contact implement. How aggressively Disc gang angles are set by operator partially determines Disc Harrow draft force resisting tractor.

A Disc Harrow with 18" diameter pans is useless for Primary Tillage, in my opinion. Some, however, may be willing to expend fuel and time to cut a small area six to ten times in different directions to get top four to five inches cultivated. Not I.

With each additional pass ground is softer and tractor/disc unit is more likely to bog down.

Consider a PTO powered roto-tiller. Roto-tillers and Disc Harrows are both soil mixing and field leveling implements. Suitable width Roto-tillers perform well behind tractors with as little as 1,700 pounds tractor weight and 20-horsepower

 

[scdeerslayer]

To buy discs (and bearings also) typically you'd buy by the diameter and the size/shape of the shaft.

 

[Gary Fowler]

Disk blades at made to fit a certain diameter of axle like 7/8" or 1" and they will fit that size whether it is square or round. So check your axle dimension closely and then order your blades for that size axle and it will work.

Note that when you install the hubs one end is concave and the other is convex so put then on right when reinstalling against the new disk. It is best to lay them out in a line when you take them off so then you can put them back on easily.