1 Genuine or spurious? - The Parts Conundrum

Warranties may be invalidated if non genuine parts are usedAs a Product Trainer with Cutting Edge Training, Nigel Church has fulfilled many roles in the turfcare industry over the past forty years. He began his career as an apprentice at Ransomes, Sims and Jefferies in 1970 and has worked in the UK and Europe. In this article, he discusses the importance of selecting genuine spare parts to keep your equipment in pristine condition

Why Genuine Parts?

There's nothing new about this statement. It has been a contentious issue for years, in many industries, as well as our own turf care sector. We all know the arguments for and against; price, warranty, correct fit first time or not, longer lasting or not etc. etc.

Products within the Ransomes portfolio are, more often than not, used in the harsh commercial mowing sector and are being used on roadside verges, housing areas, parks and open spaces. These sometimes hostile environments create high wear on cylinders, bottom blades, lift arms, pivot shafts and other associated components.

So, what of the issue of price over quality?

The bottom blade takes considerable abuse in the municipal sectorLet's look at the bottom blade; the main component that, together with the cutting cylinder, takes considerable abuse in the municipal sector, coping not only with grass, weeds and stones but drinks cans and other sometimes hidden debris. For all that, it is a relatively inexpensive, but high volume item and hence price sensitive.

The usual discussion of genuine versus non genuine goes along the lines of; "the non genuine costs less"; reply, "does it last as long?" The response; "no, but it costs less".

What is not taken into account at the time of purchase is that the user will almost certainly face a bottom blade change part way into the season with the non genuine blade, requiring the A relatively inexpensive, but high volume itemmachine to be off road, grass not being cut and incurring additional workshop costs. There are many experienced machinery operators and drivers out there who can tell the difference between the blades used.

Of course, the cutting cylinder is the other crucial part to the cutting unit and also becomes part of this debate. What is often overlooked is that the manufacture of these two items, and the materials used, has been developed and refined over 182 years of manufacturing cylinders and blades here in Ipswich. This ensures that they function together for maximum cutting efficiency, durability and longevity.

Induction heat treatment to the cutting edge of the bladeWhat makes a genuine bottom blade?

Let's look at the 30" bottom blade and its manufacture at Ipswich. Flat steel plate is loaded into an oven and brought to the relevant temperature. One at a time, the flat plates are removed, placed in a 250 tonne press and the lip is formed that will become the cutting edge of the blade.

The newly formed blade is returned to the oven in order to relieve stress, and allowed to cool naturally before being shot blasted. Excess material is then machined from the top of the blade lip.

Bottom blades are stamped with the Genuine Parts ‘R’Next, an induction heating operation, combined with the application of a special cooling process, causes a structural reaction to the metal content of the blade. This gives the blade its characteristics of cutting performance and durability.

The remaining processes are blade straightening, jig drilling (on a multi spindle drill to ensure hole positioning accuracy), grinding of the cutting edge surface, stamping with the Genuine Parts 'R' and then coating with oil before sending to parts inventory.

That's only the bottom blade, so what of the cutting cylinder?

Cylinder manufacture

The first process is feed it through a rolling mill to create the necessary curvatureA cutting cylinder is made up of a number of parts, the spiral blades, collars (or web), spindle (or shaft) and bearing housing cups. The spiral blade material is supplied flat and straight, so it is fed through a rolling mill to create the necessary curvature required. A 10" diameter cylinder may have 4, 6 or 8 blades, so there would be differences in the finished curved shape.

The next operation is to build up a cylinder on a dummy spindle. The relevant collars are positioned on the spindle with removable spacers in between. Spiral blades are the fitted into the slots in the collars and held tightly in place by steel banding wrapped around the cylinder assembly. Skilled welders spot weld at every point where the spiral blades fit into the collars.

Laser cutting for the collars, lathe turning and grinding of the bearing surfacesThe welded assembly now has the steel banding removed, the dummy spindle and spacers are withdrawn, leaving a cylinder 'cage' assembly, which is then cut to length. The cage is heated until red hot and quenched in oil to give the hardness and wear characteristics to the spiral blades, before another heat treatment process relieves stress created during the welding phase. It is then shot blasted to clean it.

Next, the relevant spindle and bearing cups are welded in place, weld spatter removed and the cylinder assembly checked for concentricity. Powder paint is electro-statically applied to the cylinder following a chemical wash and drying process to remove all contamination. The powder melts when passing through the paint oven and, once cool, the cylinders are spun ground to provide their cutting edge.

Heat treatment is the next important processThe 8" and 10" cylinders are then balanced with relevant weights. A final washing process cleans any debris from the unit before it is packed in heavy duty cardboard boxes for dispatch to the Customer Care Parts Dept.

During all these processes of both bottom blade and cylinder manufacture, there are constant checks to ensure that the high quality built into the manufacturing of the items is maintained.

Damage prevention

Yes, they may be a slightly more expensive to purchase in the short term? However, superior performance and longevity reduces costs in the long term.

The completed cylinder is chemically washed and powdered paint is electrostatically appliedRemaining with the cutting unit, perhaps the most non-technical replacement item is the pivot shaft. This is a piece of round bar, clamped onto a cutting unit lift arm on which the cutting unit pivots. Contact a tree root, kerb stone or lamppost with the cutting unit and it may well bend - and that's exactly what it's supposed to do!

This protects other components on the mower from being damaged. A pivot shaft that is too hard can snap causing the unit to fall off the machine; if too strong, then the impact damage is transferred elsewhere to a more expensive lift arm perhaps or pivot bracket assembly on top of the cutting unit.

The larger cylinders are balanced, given a final wash and packedQuite often non-genuine parts are 'beefed up' and sold as 'stronger and more, heavy duty'. So, using the example of contacting a tree root, where does the impact damage get transferred to? It will probably be the lift arm chassis mounting points or the chassis itself; you'll almost certainly be faced with an expensive repair if this happens! And, warranty would be invalid if a machine suffered such issues and non genuine parts were found to be used.


The same 'genuine' argument applies to rollers; a zinc coating helps with salt resistance, the swaged, rounded ends help minimise turf damage when turning and they are covered by a one year warranty for manufacturing or material defects. They are specifically manufactured to match the performance of product.

Quite often, non genuine parts are beefed up and sold as strongerWarranty

What about warranty on genuine parts? Yes, at Ransomes Jacobsen we offer one year, subject to fair wear and tear.

There are other parts associated with machinery, such as filters, tyres and wear skids, all of which need looking at carefully before buying the cheapest.

Final thought

And, one final thought. The ever increasing pressure on employers to control and measure Hand and Arm Vibration (HAV) levels, beyond the supply of machines when new, presents some difficult questions moving forward.

For example, let us look at a hypothetical ride-on mower which is three years old and has measurements being taken for HAVs. The findings are higher than the manufacturer's original statement, so the first remedial action is to contact the manufacturer and ask what can be done.

Without doubt, the first and most obvious question will be; is the machine to the manufacturer's original specification and fitted with genuine parts?

Genuine versus non-genuine will always be a contentious issue but, is a short-term gain preferable to increased costs further down the line. That's the call you have to make but, remember, non-genuine parts may not reduce your maintenance costs in the long term.


At the beginning of this article we asked "Why genuine parts?" and, hopefully, we have provided valid reasoning why they should be used.

Genuine parts will keep your machine working to the same high standards as new; their longer lasting performance should equate to cost savings in the long-term and they are British manufactured to the strict quality standard BSEN836.

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