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Grain-cart load cells may show different weights when the cart is parked, turning or crossing uneven ground. That difference does not automatically indicate a failed sensor. Acceleration, slope and movement at the hitch can alter the forces transmitted through the weighing supports, while the display may also apply filtering.
Establish a repeatable parked reading first
Compare readings on a suitable level surface, with the cart stationary and the same support arrangement each time. Keep the hitch, jack and attached equipment in the intended weighing condition. A jack or rigid connection that carries part of the cart weight outside the measured supports changes what the scale sees.
Use an approved reference weighing method for the loaded cart. Record the reference and cart indication close enough in time that unloading, spillage or other material changes do not invalidate the comparison. Never work beneath a raised or loaded cart without the required isolation and mechanical support.
Grain-cart load cells need separate static and mobile acceptance tests
| State | Compare | Meaning |
|---|---|---|
| Parked | Repeated readings with unchanged material and support positions | Baseline repeatability under the agreed static condition |
| Repositioned | Return to the same weighing location after moving | Whether the original indication returns after settling |
| Travelling | Speed, terrain and indication recorded together | Dynamic behaviour, not an independent calibration weight |
| Unloading | Before and after readings taken in equivalent conditions | Whether the difference represents transferred grain consistently |
If the parked readings agree but moving values fluctuate, investigate the mobile measurement method before replacing hardware. If the reading fails to return after repositioning, inspect support seating, restraint, loose mounting parts and cable strain. Keep observed behaviour distinct from a diagnosis until the mechanical and electrical checks support it.
Do not infer vehicle suitability from capacity alone
The METRAVON MV-LC0150 page lists a single-ended shear-beam design, 250 kg-10 t capacities, a nominal 2 mV/V signal and 4-12 V excitation. It describes weighing assemblies, not a qualified dynamic grain-cart system. Its catalogue load range is therefore only a starting point for a mechanical review, not permission to fit it beneath a mobile cart.
The cart designer must assess impact loads, lateral restraint, fatigue duty, support geometry and the complete installation. The weighing electronics also need a defined method for deciding when a reading is valid. A slow display filter can make a moving value look calm without making it an accurate stationary-equivalent weight.
Field questions
Q1. Can I tare on a slope and unload on level ground?
Those readings do not share the same mechanical condition. Unless the complete system has a verified compensation method for that duty, compare tare and gross readings in the agreed parked configuration.
Q2. Is a heavier-capacity cell always more reliable?
A higher rating does not resolve side loading, poor support geometry or unsuitable electronics. It can also reduce the signal change for a given small load. Select the rating from assessed support forces, then verify the usable weighing performance.
Summary
Separate repeatable parked weighing from any requirement to weigh in motion. Request a grain-cart application review with the support drawing, old sensor identification and parked-versus-moving records; do not order a generic beam cell on total cart capacity alone.
