Yetter 2996 Fertilizer Coulter - Manual (Page 8)

8
OPERATION
Yetter Model 2995 fertilizer coulters are designed to apply fertilizer 3” to 5” deep. See your fertilizer dealer
for recommended depth and distance away from row for your particular fertilizer. A popular placement
setting is 2” below and 2” away from the seed. High deposit rates require the fertilizer to be placed farther
away from the row to avoid crop “burn”.
Yetter Model 2995 fertilizer coulter can be set up to swivel or not swivel as required. By not allowing the
coulter to swivel, the distance between seed and fertilizer varies less when planting on contour.
When mounting Model 2995 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 used. This reduces the side load on the coulter during
operation. It is preferable to allow the coulter to swivel.
IMPORTANT: For proper operation, the planter frame must operate level and at the correct height,
usually 20” – 22” while in 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
populations can be drastically affected.
1. Set coulter blades to run vertical to ground. Operation 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 end play in the hub
bearings to allow it to wobble. If necessary, remove hub cap and cotter pin, adjust slotted nut to
remove wobble, re-insert cotter pin and replace hub cap.
4. KNIFE ADJUSTMENT IS CRITICAL. Adjust knife-blade clearance regularly, see page 7. An optional
knife scraper, Part #2970-133, is available to reduce the frequency of adjustment on the fertilizer coulter
knife. In addition this allows better operation in tough conditions such as freshly disked soils with
abundant trash in the top four inches of loose soil. NOTE: A ‘bump’ will appear behind knife scraper,
on blade where protected, this must be ground off periodically to maintain correct knife-blade clearance.
5. BLADE WEAR can affect operation in loose trash conditions. If knife adjustment does not stop
plugging problems, it may be necessary to replace blade.
MAINTENANCE
LUBRICATION
Each coulter is equipped with three grease zerks. To ensure longevity and reliability of the
coulter, the following lubrication schedule should be followed:
1 Lower parallel arm zerk daily
1 Pivot casting zerk daily
1 Hub bearings zerk each season
KNIFE WEAR
The lower portion of the knife and tube are subject to wear during operation. The rate of wear will
depend on a variety of factors and in abrasive soil conditions the wear will be more rapid.
On the dry fertilizer knives with cast tip, if the tube is worn, it is possible to weld on a new tube
(2975-360) to further extend the life of the dry fertilizer knife or weld on new wear plates (2975-
387) on each side.