The first step in controlling power hop is to follow performance guidelines that are listed in the Operator's Manual. The guidelines consist of:
- Correct ballast
- Front/rear weight split
- Correct tire inflation pressures
Reference the Operator's Manual to be certain these guidelines are correct for the application.
If the properly-configured MFWD tractor hops:
- Increase the front tire pressures in 2 psi increments (to a maximum of 30 psi for two-star radial tires; 36 psi for three-star radial tires) until the hop stops.
- Remove any liquid ballast from the rear tires; replace with cast weights.
- If the tractor still hops, add 75 percent liquid ballast to the front tires; remove front suitcase weights to maintain proper weight split.
Articulated 4WD Tractors
If power hop continues to be a problem, follow the steps below.
- Tire Pressure: Increase front tire pressure by 6-8 psi above the rated pressure for axle load (found in Operator's Manual or tire manufacturer's handbook). Follow steps 2 and 3 below.
If power hop remains, reduce front tire pressure to the rated tire pressure. Raise the rear tire pressure 6-8 psi above rated pressure for the axle load. Follow steps 2, 3 and 4 below.
- Remove any liquid ballast and replace with cast weights.
- Liquid ballast has a stiffening effect that causes a rough ride. If liquid ballast is used in the rear tires, all tires on the axle must be filled to the same level. Do not exceed 40% fill.
- If power hop continues after following these steps, see your local John Deere dealer and reference Dealer Technical Assistance Center (DTAC) Solution #21495.
Important: Do not use liquid ballast in the front tires.
Note: Field conditions from one field to another can have an effect on power hop. It may be necessary to vary tire air pressure as conditions change.