Yetter Avenger 30 Coulter User Manual




2565-480_REV_D 07/2013



Colchester, IL 62326-0358 Toll free: 800/447-5777

309/776-3222 (Fax) Website: E-mail:


You’ve just joined an exclusive but rapidly growing club.

For our part, we want to welcome you to the group and thank you for buying a Yetter Avenger Coulter.

This is a unique and revolutionary new product.

We hope your new Avenger coulter will help you achieve both increased productivity and increased efficiency so that you may generate more profit. This operator’s manual has been designed into four major sections.

Foreword, Safety Precautions, Installation and


Throughout the manual references may be made to left side and right side. These terms are used as viewed from the operator’s seat facing the front of the tractor.

This SAFETY ALERT SYMBOL indicates important safety messages in the manual. When you see this symbol, be alert to the

possibility of PERSONAL INJURY and carefully read the message that follows.

The word NOTE is used to convey information that is out of context with the manual text. It contains special information such as specifications, techniques, reference information of a supplementary nature.

The word IMPORTANT is used in the text when immediate damage will occur to the machine due to improper technique or operation. Important will apply to the same information as specified by note only of an immediate and urgent nature.

It is the responsibility of the user to read the operator’s manual and comply with the safe and correct operating procedure and to lubricate and maintain the product according to the maintenance schedule in the operator’s manual.

The user is responsible for inspecting his machine and for having parts repaired or replaced when continued use of the product would cause damage or excessive wear to the other parts.

It is the user’s responsibility to deliver his machine to the Yetter dealer who sold him the product for service or replacement of defective parts which are covered by the warranty policy.

IMPORTANT: When raising 3 pt. Toolbars watch tractor tire clearance. EXAMPLE: In most cases 3 pt. hitches require a cat. 2 or cat. 3 quick hitch coupler to offset toolbar away from tractor tires.


309/776-4111 800/447-5777 309/776-3222 (FAX)


Yetter Manufacturing warrants all products manufactured and sold by it against defects in material. This warranty being expressly limited to replacement at the factory of such parts or products as will appear to be defective after inspection. This warranty does not obligate the Company to bear cost of labor in replacement of parts. It is the policy of the company to make improvements without incurring obligations to add them to any unit already sold. No warranty is made or authorized to be made, other than herein set forth. This warranty is in effect for one year after purchase.

Model Number:_________________________

Dealer :___________________ ____________

Yetter Manufacturing warrants its own products only and cannot be responsible for damage to equipment on which mounted.



A brief description of signal words that may be used in this manual:

CAUTION: Used as a general reminder of good safety practices or to direct attention to unsafe practices.

WARNING: Denotes a specific potential hazard.

DANGER: Denotes the most serious specific potential hazard.


You can make your farm a safer place to live and work if you observe the safety precautions given. Study these precautions carefully and insist that they be followed by those working with you and for you.

Finally, remember this: an accident is usually caused by someone’s carelessness, neglect or oversight.


Never clean, lubricate or adjust a machine that is in motion. Always lower or block the implement before performing service.

If the machine must be serviced in the raised position, jack or block it up to prevent it from accidentally falling and injuring someone.

Do not allow riders on the tractor or implement.

Use speeds and caution dictated by the terrain being traversed. Do not operate on any slope steep enough to cause tipping or loss of control.

Be sure all personnel are clear of the immediate area before operating.

Read and understand the operator’s manual and require all other persons who will operate the equipment to do the same.

Be familiar with all tractor and implement controls and be prepared to stop engine and implements quickly in an emergency.


Consult your implement and tractor operator’s manual for correct and safe operating practices.

Beware of towed implement width and allow safe clearance.




Examine all equipment carefully for damage or shortages.

2986-030 - 30” Avenger Coulter includes QTY

(1) 2986-106 – Arm Assembly

(1) 2986-130 – Parts Box

(1) 2571-205 – 30” Blade

(1) 6000-002 – Close wheel Kit

Optional Equipment: 2986-108 – Skid Shoe Kit.

Lubricate all bearings and moving parts as you assemble and see that they work freely.

NOTE: When you are behind the coulter looking forward, the right hand coulter is assembled with the blade to the right hand of the arm assembly. The left hand coulter is assembled with the blade to the left hand of the arm assembly.



1.Improperly tightened bolts will result in damage, breakage, expense, and down time.

2.Always replace bolts with the specified grade and type.

3.Torque properly before first use of the machine and every 2-4 hours of use until you are sure bolts are staying tight.

4.The chart below is a guide for proper torque. Use it unless a specified torque is called out elsewhere in the manual.

5.Torque is the force you apply to the wrench handle or the cheater bar, times the length of the handle or bar.

6.Use a torque wrench whenever possible.

The following table shows torque in ft. lbs.



WARNING: Never work under the toolbar while in a raised position without using safety lockups.

WARNING: Use extreme caution, the blade is sharp and may cause bodily injury.

The 30” coulter that are mounted on 12” spacing will need to be completely assembled before mounting to the toolbar.

NOTE: To aid the assembly of the opener, it is recommended that a stand be constructed to temporarily attach the opener and hold it in an upright position.

CAUTION: The coulter and its components are very heavy. Extra attention to lifting techniques while handling and or maneuvering the coulter during assembly is very important. Failure to do so may lead to personal injury or death.

STEP 1. Attach the 2986-111 hub assembly and 2986-318 hub cap retainer to the 2986-106 main arm assembly using (4) ½” x 1-1/2” hex head bolts. This step will determine right hand or left hand coulter assembly.




STEP 2. Attach the 2986-211 Rear Knife Arm to the 2986-111 hub assembly using (4) ½” x 1-1/2” hex head bolts. Make sure that the mount for the knife is on the same side of the arm as the spindle/blade.

STEP 3. Attach the 2986-213 Closing System Mount to the 2986-211 Knife Arm using (2) ½” x 3” hex head bolts and (1) ½” x 1 ½” hex head bolt and ½” hex lock nuts.

STEP 4. Attach the 2986-212 Closing System Adjustment to the 2986-213 Closing System Mount Bracket using (2) ½” x 1 ½” hex head bolts and ½” hex lock nuts.



STEP 5. Attach the 30” blade 2571-205 to the 2986-111 hub assembly using (6) ½” x 1 ½” plow bolts and ½” hex lock nuts.

NOTE: The blade must be centered on the spindle. Bolts are to be just slightly tightened. At STEP 7 they are to be tightened securely and torqued to 90-96 FT/LBS.

STEP 6. Attach the Avenger Knife 2986-214 to the Knife Arm 2986-211 using shims as needed to align the knife point with blade and using (2) ½” x 2” hex head bolts, hardened flat washers and ½” NIF-LOK nuts.

STEP 7. Center the blade on the spindle, check by rotating blade and watching clearance between knife and blade. Move the blade on the spindle as required until the blade runs concentric. Tighten (6) ½” lock nuts, torque to 90-96 ft/lbs. THE BLADE MUST RUN CONCENTRIC.

STEP 8. Adjust knife clearance to blade as close as possible. The high point of the blade should clear the knife no more than 1/64” max. as the blade is rotated. The blade should rotate freely. Tighten (2) ½” x 2” hex bolts to 120 ft/lbs. Re-check clearances by rotating blade one full revolution after all bolts are tight. Lock the knife in place by using the 5/8” x 2 ½” setscrew and 5/8” hex jam nut to prevent the knife from moving rearward.



The adjustment of knife clearance to the blade is critical to trouble free operation of the coulter, in certain conditions the coulter can “plug” in just a few feet if not correctly adjusted.

1.The disc blade must run concentric. Adjust by loosening six hub nuts and centering the blade.

2.Set knife to rub slightly on blade, especially at bottom of knife. See illustrations above. Tighten NIFLOK nuts to 120 ft/lbs. by using the wrench on both the bolt head and the nut.

3.Adjust the 5/8” x 2 ½” bolt down against the stop of the knife to lock the knife in place, tighten the jam nut to secure bolt.



STEP 9. Attach the 6200-201 Closing Wheel Bracket to the 2986-212 adjustment bracket using (2) ½” x 1-½” hex head bolts and lock nuts. NOTE: Securely tightening the bolts at this step is not necessary because the infield height adjustment will be done later for proper operation of the closing system.

STEP 10. Assemble the 6000-002 Close Wheel Kit as shown in illustration below.

STEP 11. Attach the 6000-002 Close Wheel Assembly to the 6200-201 Close Wheel Mount Bracket by first inserting the hook of the spring through the hole of the mount bracket then use (1) ½” x 6 ½” hex head bolt, eccentric bushings and ½” lock nut.


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