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Power hop is a condition where the tractor exhibits severe bounce and/or jump at field working speeds under 16 km/h (10 mph), and is associated with tractors pulling towed implements at medium to high draft loads in loose, dry soil on top of a firm base and/or when climbing hills. As a result, the tractor cannot maintain pull due to either loss of traction, rough ride, or both.
Make the following adjustments to inflation pressures,
only
after following the performance guidelines (recommended weight split, correct ballast, and correct inflation pressures):
1.
Increase
front
tire pressure by 41-55 kPa (0.4-0.6 bar) (6-8 psi) over the rated pressure for the axle load. Lower front tire pressure back to rated pressure and raise
rear
tire inflation pressure by the same amount above rated pressure for the axle load, if power hop remains a problem.
NOTE:
Whether raising the front or rear inflation pressure depends on weight splits, operating conditions (steep slopes) or travel speeds. On steep slopes and operating speeds above 8.8 km/h (5.5 mph) raising the rear pressure is best.
Tires on one of the two axles must remain at rated pressure.
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Ballast tractor so no more than 55 percent of the total tractor weight is on the front, for best power hop control.
2.
Remove any liquid ballast and replace with cast weight equivalent, if power hop remains a problem.
3.
Liquid ballast should be avoided since it has a stiffening effect that causes the tractor to ride roughly and generally reduces the ability to control power hop. If liquid ballast is used in the rear tires,
all tires on the axle must be filled to the same level
which should not exceed 40 percent fill.
IMPORTANT:
Absolutely no liquid ballast should be used in the front tires.
4.
If power hop remains a problem, see your John Deere Dealer.
NOTE:
Tire inflation pressures and ballasting may need to be changed when operating conditions change. For example, when tractor is being used with hitch-mounted implements, rear tire inflation may need to be increased from the recommended levels for pull-type implements and decreased when removing hitch-mounted implements.
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