FRAME MOUNTED
SPRING LOADED
CONSERVATION
MODEL 2991 AND 2999
SET-UP & PARTS CATALOG
YETTER MANUFACTURING CO.
FOUNDED 1930
Colchester, IL 62326-0358
Toll free: 800/447-5777
309/776-3222 (Fax)
Website: www.yetterco.com
E-mail: info@yetterco.com
COULTER
YETTER MODEL 2991 and 2991
FRAME MOUNTED SPRING LOADED COULTER
BASIC COULTER BOX
2999-101 COULTER ASSEMBLY
2991-101 COULTER ASSEMBLY
CLAMPS
2990-154 CLAMP KIT 2-1/2 SQ. BAR
2990-155 CLAMP KIT 2 X 6 BAR
2990-156 CLAMP KIT 4 X 4 BAR
2990-157 CLAMP KIT 5 X 7 BAR
2990-158 CLAMP KIT 7 X 7 BAR
2990-159 CLAMP KIT 3” DIAMOND BAR
2990-160 CLAMP KIT 3-1/2” DIAMOND BAR
2990-161 CLAMP KIT 3 X 7 BAR
2990-162 CLAMP KIT 2-1/2 SQ. BAR, ½” SPACER
2990-163 CLAMP KIT 3” SQ. BAR
SHANKS
2990-310 SHANK 12-5/8”
2990-318 SHANK 16”
3010-303-SHANK 22”
2990-328 SHANK 26”
3011-302-SHANK 22” LONG, 5” OFFSET
2990-208 SHANK 12-5/8 LONG, 3” OFFSET
2990-342 SHANK 18”, ¾ OFFSET
WARRANTY POLICY
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.
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SAFETY PRECAUTIONS
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 those working with you and for you follow them.
Finally, remember this: an accident is usually caused by someone’s carelessness, neglect or oversight.
WARNING
Never clean, lubricate or adjust a machine that is in motion. Always lower or block the implement before
performing service.
If machine must be services 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.
CAUTION
Consult your implement and tractor operator’s manual for correct and safe operating practices.
Beware of towed implement width and allow safe clearance.
FAILURE TO HEED MAY RESULT IN PERSONAL INJURY OR DEATH.
INSTALLATION
1. Assemble3/8 x 2-1/2” roll pin into hole at end of 1-1/2” dia. shank, leaving
approximately equal amount protruding out each side.
2. Insert lock collar into pivot and slide shank up through casting and lock collar. If you
wish to lock the coulter from pivoting, slide roll pin into slots in casting. If you wish to
let coulter pivot, do not align roll pin with casting slots, but slide shank up until roll pin
contacts casting surface. Install and tighten 5/8” setscrew in lock collar to 110 ft. lbs.
torque maximum.
3. Mount 17” coulter blade to hub using (4) ½ x 1-1/2” carriage bolts, lock washers and
hex nuts.
4. Assemble clamp components loosely to tool bar as shown in parts view of appropriate
clamp. The clamp setscrew must mount to the right, away from spring, as shown.
5. Position coulter clamps either toward the inside or outside of the planter openers on
each side of planter to equalize draft. Tighten (4) ½” bolts in clamps.
6. Install coulters on planter by inserting shank up through clamps and tightening 5/8 x
1” setscrews.
7. Install 5/16 x 2-1/2” cotter pins in all vertical 1-1/2” dia. shanks. The roll pin prevents
loss of coulter should the clamp setscrews work loose. Cotter pin can be installed
between clamp castings or on top, above top castings, depending on shank used.
8. Set coulter depth by loosening setscrews in clamp castings.
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OPERATION
GENERAL
Yetter Model 2999 coulter can be set up to swivel or not to swivel as required. It is
preferable to allow the coulters to swivel usually.
When mounting 2999 coulters on 3-point or 2-point hitch planters, the coulters should be
set up to swivel, particularly if a 4-wheel drive tractor is to be used. This reduces the side
load on the coulter during operation.
In hard no-till conditions the desired operating depth may not be possible. Tighten spring
nut to maintain depth if spring is flexing rather than lower coulter to obtain maximum
depth.
Planter weight may limit operating depth in hard conditions, particularly with mounted or
semi-mounted planters. Be sure planter has enough weight to keep drive wheels on the
ground during operation or plant population can be drastically affected.
1. Set coulter blades to run vertical to the ground. Operating depth and blade wear
can be affected if coulter is mounted crooked. If coulters are set-up to not swivel,
be sure they run straight with the direction of travel.
2. After a few hours use, check all bolts and setscrews for tightness.
3. After a few days use, check coulter hubs for loose bearings. There should be no
endplay in the hub bearings to allow it to wobble. If necessary, remove hubcap
and cotter pin, adjust slotted nut to remove wobble, re-insert cotter pin and replace
hubcap.
4. If you have elected to let coulter swivel, set lock collar to allow swivel in one or
both directions as required.
If you have elected to hold coulter rigid, set coulter straight with the direction of
travel.
5. Set front spring tension by adjusting ¾” lock nuts until ¾” of threads are exposed
above the nut. This should provide adequate down-pressure for most conditions.
If additional pressure is required the nut may be tightened down further. NOTE:
This will reduce vertical movement of coulter. Beware of obstacles and allow
adequate movement to clear them.
6. Grease (2) fittings on each coulter before operation and weekly thereafter. The
hub bearings should be greased only a few times each season.
7. NEVER mount coulters under planter drive shaft to allow coulter blade to contact
shaft when obstacle is struck. Coulters must be mounted so blade always can flex
up and clear drive shaft.
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PARTS IDENTIFICATION
2990-154 Clamp Kit, 2-1/2” Sq. Bar 2990-155 Clamp Kit, 2 x 6 Bar
Key Qty. Part No. Description Key Qty. Part No. Description
1 4 2502-368 1/2-13 x 5-1/2” HHCS GR. 5 ZP 1 4 2502-362 1/2-13 X 5” HHCS GR. 5 ZP
2 2 2990-313 Clamp Plate, 2-1/2 Square Bar 2 2 2990-322 Clamp Plate, 2 x 6 Bar
3 2 2990-360 Clamp Casting, Drilled 3 2 2990-360 Clamp Casting, Drilled
4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP 4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP
5 4 2520-357 1/2-13 Hex Lock Nut ZP 5 4 2520-357 1/2-13 Hex Lock Nut ZP
6 1 2515-690 5/8 OD Vinyl Tube, Cut 1-1/2”
2990-156 Clamp Kit, 4 x 4 Bar 2990-157 Clamp Kit, 5 x 7 Bar
Key Qty. Part No. Description Key Qty. Part No. Description
1 4 2502-371 1/2-13 x 7” HHCS GR. 5 ZP 1 4 2502-369 1/2-13 X 8” HHCS GR. 5 ZP
2 2 2990-314 Clamp Plate, 4” Sq. & 3” Diamond Bar 2 2 2990-315 Clamp Plate, 5 x 7 or 7x 7 Bar
3 2 2990-360 Clamp Casting, Drilled 3 2 2990-360 Clamp Casting, Drilled
4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP 4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP
5 4 2520-357 1/2-13 Hex Lock Nut ZP 5 4 2520-357 1/2-13 Hex Lock Nut ZP
NOTE: The 5/8” OD vinyl tube provided in 2990-154, 2990-158, 2990-161 and 2990-163 is required on implements using a 5/8” ID hose.
2990-158 Clamp Kit, 7 x 7 Bar 2990-161 Clamp Kit, 3 x 7 Bar
Key Qty. Part No. Description Key Qty. Part No. Description
1 4 2502-376 1/2-13 x 10” HHCS GR. 5 ZP 1 4 2502-373 1/2-13 X 6” HHCS GR. 5 ZP
2 2 2990-315 Clamp Plate, 5 x 7 or 7 x 7 Bar 2 2 2990-315 Clamp Plate, 5 x 7 or 7 x 7 Bar
3 2 2990-360 Clamp Casting, Drilled 3 2 2990-360 Clamp Casting, Drilled
4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP 4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP
5 4 2520-357 1/2-13 Hex Lock Nut ZP 5 4 2520-357 1/2-13 Hex Lock Nut ZP
6 1 2515-690 5/8 OD Vinyl Tube, Cut 1-1/2” 6 1 2515-690 5/8 OD Vinyl Tube, Cut 1-1/2”
2990-163 Clamp Kit, 3 x 3 Bar 2990-171 Clamp Kit, 3 x 4 Bar
Key Qty. Part No. Description Key Qty. Part No. Description
1 4 2502-373 1/2-13 x 6” HHCS GR. 5 ZP 1 4 2502-373 1/2-13 X 6” HHCS GR. 5 ZP
2 2 2990-339 Clamp Plate, 3” Square Bar 2 2 2990-314 Clamp Plate, 4” Sq. & 3” Dmd Bar
3 2 2990-360 Clamp Casting, Drilled 3 2 2990-360 Clamp Casting, Drilled
4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP 4 2 2503-379 5/8-11 x 1 Sq. HCPSS Gr. 5 ZP
5 4 2520-357 1/2-13 Hex Lock Nut ZP 5 4 2520-357 1/2-13 Hex Lock Nut ZP
6 1 2515-690 5/8 OD Vinyl Tube, Cut 1-1/2” 6 1 2515-690 5/8 OD Vinyl Tube, Cut 1-1/2”
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PARTS IDENTIFICATION
2990-159 Clamp Kit, 3” Diamond Bar
Key Qty. Part No. Description
1 4 2502-369 1/2-13 x 8” HHCS Gr. 5 ZP
2 2 2990-314 Clamp Plate, 4” Sq. or 3” Diamond
3 2 2970-326 Adaptor, 3” Sq. Diamond Bar
4 2 2990-360 Clamp Casting, Drilled
5 2 2503-379 5/8-11 x 1” Sq. HCPSS Gr. 5 ZP
6 4 2520-352 1/2-13 Lock Hex Nut ZP
2990-160 Clamp Kit, 3-1/2” Diamond Bar
Key Qty. Part No. Description
1 4 2502-374 1/2-13 x 9” HHCS Gr. 5 ZP
2 2 2990-316 Clamp Plate, 3-1/2” Diamond Bar
3 2 2970-327 Adaptor, 3-1/2” Sq. Diamond Bar
4 2 2990-360 Clamp Casting, Drilled
5 2 2503-379 5/8-11 x 1” Sq. HCPSS Gr. 5 ZP
6 4 2520-352 1/2-13 Lock Hex Nut ZP
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PARTS IDENTIFICATION
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Our name
Is getting known
Just a few years ago, Yetter products were sold primarily to the
Midwest only. Then we embarked on a program of expansion and
moved into the East, the South, the West and now north into
Canada. We’re even getting orders from as far away as Australia
and Africa.
So, when you buy Yetter products . . .you’re buying a name that’s
recognized. A name that’s known and respected. A name that’s
become a part of American agriculture and has become synonymous
with quality and satisfaction in the field of conservation tillage.
Thank you.
YETTER MANUFACTURING CO.
Colchester, IL 62326-0358 309/776-4111
Toll Free 800/447-5777
Fax 309/776-3222
Website: www.yetterco.com
E-mail: info@yetterco.com
2565-579 03/08
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