1. Fore and aft leveling.
Verify that the cushion leveling assembly is in the correct setting. For machines with harrow attachments, the linkage should be connected to the hole closest to the rockshaft. For machines without harrow attachments, the linkage should be connected to the middle hole on the rockshaft. Next, park the machine on a level area with wings unfolded and the unit in the transport position. Adjust the hydraulic leveling cylinder or turnbuckle until the machine is level.

2. Wing leveling adjustment.
Adjust the wing depth cylinder eyebolt so the wings are level to the mainframe side to side.(To adjust, lower the unit on the ground to remove weight to make adjustment easier.) Due to varying soil conditions, the wing may need additional fine-tuning to obtain wing levelness in the field. Fine-tune as required.

3. Depth adjustment.
Set machine to run no deeper than is required. Because these new models do an excellent job of penetrating ground, excessive depth will cause horsepower requirements to increase. To find the “0” starting point when setting up the machine, lower the disk so the blades just touch the ground. Adjust the crank depth until the slide pushes the valve button in. Now you have a “0” depth starting point from which you can set the depth you want. Four turns of the depth crank changes depth 1 inch (25 mm). (Adjusting the front gang lower fore and aft will also increase depth.)

4. Harrow adjustment.

a. Coil tine harrow
Do these three steps in this order.
1. Set the tine angle. (Upright is most aggressive. A flat tine angle is less aggressive and improves residue flow.)
2. Set the depth with the crank to achieve desired depth and output.
3. Level the harrow front to rear so front and rear tine depth is uniform. The front bolt hole is slotted to allow levelness adjustment. Loosen the rear bolt to make adjustment easier. Retighten both bolts to hold the harrow level. (When the tine angle is changed, the depth must be reset. When the depth is changed, the levelness must be reset.)

b. Three-bar spike-tooth harrow
Shortening the pull chains increases the aggressiveness of the harrow. To stop bunching in front of the harrow, lengthen the pull chain. (Sometimes it helps to shorten the pull chain enough to raise the front bar a little.) To help feather out bunching, shorten the second row of vertical chains one link and the third row two links.

Tandem disk blades will not penetrate ground, trouble cutting residue.

Cause:
1. Ground conditions are hard.
2. Front gang is too shallow.
3. Disk blades are dull.

Solution:
1. Reduce ground speed within operational guidelines.
2. Adjust turnbuckle (or hydraulic leveling cylinder if equipped) to lower the front of the disk.
3. a.) Sharpen or replace the disk blades.
3. b.) Use #11 edge blade (not for rocky conditions) – ST440 only.

The tandem disk leaves a ridge between passes.

Cause:
1. Front gang is set too deep.
2. You are operating the disk too fast.
3. Wings are not running level with mainframe.
4. Wings are digging in or gouging.

Solution:
1. Adjust hitch turnbuckle (or hydraulic leveling cylinder) to decrease front gang penetration.
2. Reduce ground speed within operational guidelines.
3. Adjust wing transport wheels to stabilize wing, leveling disk side to side.
4. a) Adjust wing transport wheel eyebolts to stabilize wing, leveling disk side to side.
4. b) Install and adjust optional gauge wheel attachment on larger units.

The disk gang plugs.

Cause:
1. Disk gang is stalling.

Solution:
1. Adjust scrapers to reduce scraper pressure on blades if blades are running clean.
2. Increase scraper pressure on blades if residue is collecting between scrapers and blades, or move scraper away from blade if soil conditions are dry.
3. Adjust scrapers so the toe touches FIRST. Replace scraper if the scraper blade is worn.

The tandem disk leaves a ridge in the center.

Cause:
1. Disk is tilted too far to the rear.
2. Cushion leveling assembly is set in the wrong hole.
3. You are operating the disk too fast.

Solution:
1. Adjust turnbuckle (or hydraulic leveling hitch cylinder) to lower the front of the disk.
2. For machines with harrows, use the hole closest to rock shaft. For machines with no harrow, use the middle hole.
2. a.) Reduce ground speed within operational guidelines.
2. b.) Use 2 inch (51 mm) smaller taper blades for the two rear center blades.

The tandem disk leaves a valley in the center.

Cause:
1. The disk is tilted too far forward.
2. You are operating the disk too slowly.

Solution:
1. Adjust hitch turnbuckle (or hydraulic leveling cylinder) to increase rear gang penetration.
2. Increase ground speed within operational guidelines.
3. Check cushion leveling assembly length and hole setting position.

The center section penetrates deeper than the wings.

Cause:
1. Wing depth is too shallow.

Solution:
1. Adjust wing wheel eyebolts so all disk gangs operate level.
2. Decrease disk depth. If the main frame is running too deep, the wings may float out.

NOTE: ALL wheels should carry weight.

For more information about setting, adjusting and troubleshooting crop production equipment, see your New Holland dealer.