Case 9370, 9380, 9390 Quadtrac Tractor Repair Manual

Table of Content (Service Manual)

General
Engine
Fuel System
Electrical
Steering
Power Train
Brakes
Hydraulics
Chassis
Manual Extract: Tractor Ballast
Loads Matched to Tractor

1. The best traction occurs when wheel slip for tractors equipped with bias tires is between 8 to 12 percent and 5 to 8 percent for tractors equipped with radial tires. Operating within this range will provide the best fuel economy, performance and tire life.

Proper ballasting procedures will provide the most efficient use of the tractor available horsepower. It will not make up for implements that are too large for the tractor. If engine speed falls off below the rated operating RPM range and wheel slip is not above the recommended operating range, adding weight WILL NOT improve tractor performance.

2. Before adding ballast, the tractor static weight distribution must be determined. Correct static weight ratio for the work application must be obtained and maintained so that equal (50-50) front and rear axle tractive effort is obtained when the tractor is under load.

3. Remove the weight when not needed for lighter loads.
4. Pull lighter loads at a little faster speed to do more work and increase efficiency. DO NOT over weight the tractor to pull very heavy loads.

The most important item in field operations is the amount of horsepower available at the hitch or drawbar. Power needed to move a tractor that has too much weight will decrease the power that is available to pull the implement.

IMPORTANT: The total tractor weight with all equipment and ballast weight must never be more than the maximum recommended operating weight.