Step 1: Start with your power unit

The first check for any power tiller mounted reaper is which machine will carry it and how much horsepower that machine has.

If your machine is a micro-cultivator in the 4 to 9 HP range, the GW100C2 is the match. If you run a walking tractor between 8 and 18 HP, look at the GS120C2. The two ranges overlap around 8 to 9 HP, but each head is described for a different type of power unit. Choose by machine type first, then check horsepower.

When this guide does not apply: the materials do not document fit for four-wheel mini tractors, riding tractors, or power units outside the stated horsepower ranges. Buyers searching for a mini tractor mounted reaper should ask the supplier to confirm compatibility before ordering. Neither head should be assumed to fit.

Step 2: Compare working width and stated output

The GS120C2 is the wider of the two and has a higher stated output range. These output figures are the manufacturer's stated ranges. Actual results depend on the crop, field conditions and operator, and the materials do not describe the test conditions. Treat them as reference values, not guarantees.

Step 3: Check crop suitability

• GW100C2: pepper, rice, wheat, prunella, mint and other crops
• GS120C2: oats, pepper, millet, prunella, mint and other crops; also described as suitable for traditional crops and Chinese herbal medicine harvesting

Both heads list pepper, prunella and mint. If your main crop isn't named, send the supplier the crop type, stalk height and field conditions and ask for confirmation.

Step 4: Review discharge form and stubble setting

The two heads work the same way here:

• Discharge: after cutting, crops are laid out on the right side so they can be collected and processed afterwards.
• Stubble height: the source says stubble height "can be adjusted up to 3 cm." If your crop or soil conservation practice needs a specific stubble height, confirm the full adjustment range with the supplier.

Because both heads lay crops to one side, plan for separate collection or binding. The materials do not describe a binding function for either head.

Step 5: Plan logistics with packing data

The GS120C2 description gives two different weights (71.8 kg and a 90 kg net weight). Ask the supplier to clarify which figure applies before you calculate freight or handling needs.

Step 6: Installation and maintenance expectations

Both descriptions say installation means mounting the head on the power unit and then adjusting working height and angle. Daily upkeep is described as simple maintenance and cleaning. The materials do not include an operating manual, a maintenance schedule or safety instructions. Ask for these documents before you take delivery.

Quick selection summary

• Choose the GW100C2 if you operate a 4 to 9 HP micro-cultivator, need a 100 cm working width, and harvest crops such as pepper, rice, wheat, prunella or mint.
• Choose the GS120C2 if you operate an 8 to 18 HP walking tractor, want a 120 cm working width, and harvest crops such as oats, pepper, millet, prunella or mint.
• Confirm with the supplier first if your power unit is a mini tractor or falls outside these ranges, if your crop isn't listed, or if you need pricing, lead time, certification or warranty details.