FMTTI Testing for Power Weeders
Both center-rotary and back-rotary power weeders are tested under FMTTI's self-propelled, walk-behind category — there's no separate fee line or test regime for the two configurations. AgPro guides the process; Regional FMTTIs (self-propelled, walk-behind category) conducts the test.
What the test evaluates
- Engine performance on a dynamometer — power, torque and fuel consumption across speeds and loads
- Mechanical vibration at the steering handle and controls
- Noise level at the operator's ear and at a bystander's position
- Turning ability — minimum turning and clearance diameter
- Rotary blade hardness and chemical composition
- Field performance — depth and width of cut, field efficiency and weeding efficiency
- Post-test teardown and wear inspection of the engine, blades and bearings
FMTTI test reference & related standards
| Body / Standard | What it covers |
|---|---|
| IS 9935 / IS 9980 | Power tiller test code and field-performance guidelines — there's no dedicated IS test code for power weeders, so institutes test against the closest available standards. |
| IS 6690 | Rotavator blade specification, used to check rotor blade hardness and material. |
| Ministry critical technical specifications circular | A pass/fail checklist specific to power weeders — working width, blade thickness/hardness minimums and required safety provisions. |
Center-rotary and back-rotary power weeders — how FMTTI testing actually works
"Power weeder" covers two common configurations sold in India: a center-rotary design, with the rotary blade unit mounted centrally under the machine between the engine and the operator, and a back-rotary design, with the rotary unit mounted at the rear. Both are self-propelled, walk-behind machines built around a small petrol or diesel engine, and — this is the detail worth knowing before you budget or plan a schedule — both are tested under the same FMTTI category. Blade position is a design and marketing choice, not a separate test regime, fee line, or validity rule.
What FMTTI testing costs
Power weeders share a fee line with power tiller-drawn/self-propelled reapers in the official testing-charge schedule, currently ₹1,21,961 for FY 2025-26, exclusive of GST. That figure is revised periodically — confirm the live rate with your target institute before committing to a budget.
There's no dedicated test standard — here's what fills the gap
No IS test code exists specifically for a self-propelled power weeder, regardless of whether it's a center-rotary or back-rotary design. Institutes fill that gap with the closest available standards: the Power Tiller test code (IS 9935) and its field-performance guidelines (IS 9980), the manually-operated rotary paddy weeder spec (IS 1976), and the rotavator blade spec (IS 6690) for checking rotor blade hardness and material. On top of those, a separate Ministry circular sets out power-weeder-specific critical technical specifications — a pass/fail checklist covering working width, blade thickness and hardness minimums, and required safety provisions like an emergency stop, a rotor shield, and a depth control mechanism.
What actually gets tested
Both configurations go through the same physical battery of tests: engine performance on a dynamometer, mechanical vibration at the handle and controls, noise at the operator's ear, turning ability, rotary blade hardness and chemical composition, full field performance (depth and width of cut, field efficiency, weeding efficiency), and a post-test teardown to inspect wear on the engine, blades and bearings against permissible limits. In real, published test reports we've reviewed, weeding efficiency and field efficiency have both landed anywhere from the high-60s to low-90s percent, depending on the specific machine and soil conditions — testing has also caught genuine issues in real cases, including blade thickness under the required minimum and blade material outside the specified composition.
Sample size and report validity
In practice, manufacturers generally submit 5 units for a power weeder test — the regulations describe submitting a test sample rather than fixing one number for every case, so confirm the exact count with your target institute before shipping.
Report validity isn't fixed either: real Initial Commercial Test reports we've reviewed have carried validity periods of both 5 years and 7 years, depending on which Ministry circular was in force at the time of testing. Check the validity date printed on your own report rather than assuming a number.
Where AgPro fits in
Whichever configuration you build — center-rotary or back-rotary — AgPro Consulting confirms the applicable fee, prepares documentation, and provides guidance, consultation and information on the relevant regional FMTTI's process. The physical test itself is always conducted by FMTTI's own Test Engineers, at the institute — AgPro's role is guidance, not testing.
Frequently asked questions
- No. Both configurations — rotary blades mounted centrally under the machine, or mounted at the rear — fall under the same self-propelled, walk-behind power weeder category for testing and fees. The blade position is a design choice, not a separate FMTTI test category.
- In practice, manufacturers generally submit 5 units. The regulations describe submitting a test sample rather than fixing one number for every case, so confirm the exact count with your target institute before shipping.
- Real Initial Commercial Test reports we've reviewed show validity anywhere from 5 to 7 years, depending on which Ministry circular was in force at the time of testing — check the validity date printed on your own report rather than assuming a fixed figure.