Calculating Ballast (Tractors Without Hitch)

Add enough weight to rear axle to achieve desired weight split. Then, to increase total weight per engine horsepower add equal amounts of weight to each axle. Chart below illustrates how weight splits between the front and rear axles are affected as weight is added to the rear axle only.

ADD	9370R	9420R	9470R	9520R	9570R	9620R
1000 lb.	56/44%	57/43%	57/43%	56/44%	56/44%	55/45%
2000 lb.	—	56/44%	56/44%	55/45%	55/45%	55/45%
3000 lb.	—	56/44%	56/44%	53/47%	53/47%	53/47%
4000 lb.	—	53/47%	53/47%	52/48%	52/48%	52/48%
5000 lb.	—	53/47%	53/47%	51/49%	51/49%	51/49%

Factory Recommendation for Overall Best Performance
Model	Front Ballast	Rear Ballast	Weight Split
9370R*	0	2130 lb.	56/44
9420R	0	4000 lb.	54/46
9470R	0	3920 lb.	54/46
9470R	1250 kg (2756 lb.)	7080	53/47
9520R	1250 kg (2756 lb.)	7080	53/47
9570R	1250 kg (2756 lb.)	7080	53/47
9620R	1250 kg (2756 lb.)	7080	53/47
* May not require additional ballast if power hop is not a concern. Up to 4000 lb. can be required on rear axle to achieve desirable weight split if power hop is a concern.

Cast Weights Required for Ballast Recommendation
2126 lb. — 1 72 kg (159 lb.) plus 2 205 kg (452 lb.) weights on each dual wheel
2756 lb. — 1 625 kg (1378 lb.) weight each inner wheel
3950 lb. — 1 205 kg (452 lb.) installed on each inside/inner and 1 72 kg (159 lb.) plus 3 205 kg (452 lb.) weights on each rear
7080 lb. — 1 set of 20 rear frame weights and 1 625 kg (1378 lb.) installed on each rear inside/inner wheel and 1 72 kg (159 lb.) plus 2 205 kg (452 lb.) weights on each dual