CrustBuster 4750 Drill User manual

P.O. Box 526 - Spearville, Kansas 67876 - [phone]
4750 Drill
OWNER'S MANUAL
# 616698 - 2020

Identification
Your CrustBuster® drill is identified by a Serial Number and Model Number.
Record these numbers in the spaces provided in this manual and refer to them
when ordering parts or requesting service.
Serial Number Model Number
Warranty
WARRANTY: In addition to the implied warranties of fitness and of merchantability,
CrustBuster®/Speed King, Inc. warrants new products sold by it to be free from defects in
workmanship and material for a period of 12 months, from the date of delivery to the first user
customer. Warranty on purchased parts (cylinder, blades, bearings, shanks, etc.) will be the same
as that offered by the appropriate manufacturer of these parts.
EXCLUSIONS: No warranty of any kind is made by CrustBuster®/Speed King, Inc. with regard
to new products which have been subject to operation in excess of recommended capacities,
misuse, abuse, negligence, or accident, or have been altered or repaired in any manner not
authorized by CrustBuster®/Speed King, Inc. CrustBuster®/Speed King, Inc. is constantly striving
to improve its products. Changes in design and improvement will be made whenever
CrustBuster®/Speed King, Inc. believes the efficiency of its products will be improved thereby, but
without incurring any obligation to incorporate such improvements in any products which have been
shipped or are in service. No obligation exists for compensation of unauthorized repairs or
modifications without prior approval. And in no event will CrustBuster®/Speed King, Inc. be liable
for consequential damages, such as but not limited to: downtime, delayed or late tillage or
planting, etc.
WARRANTY REGISTRATION: This warranty is not valid unless registered with
CrustBuster®/Speed King, Inc. within 10 days from the date of purchase. It is the sole
responsibility of the selling retail dealer to fill out the registration forms and see that they are
properly filed with CrustBuster®/Speed King, Inc.
WARRANTY PROCEDURE: Should any part fail to conform with this warranty,
CrustBuster®/Speed King, Inc. will repair or replace the part or parts which do not conform. If a
part is defective, take it to your authorized CrustBuster® Farm Equipment Dealer immediately,
along with your warranty registration, and complete the proper forms requesting a warranty
adjustment. Our representative will pick up the part to be returned to the factory for examination.
If the customer (first user) requests that a new part be substituted for the old part, a new part will
be charged to the dealer who will in turn charge the customer. If the part is found by us to be
defective, a credit for the part will be given to the dealer to be passed on to the customer. If the
dealer or customer wishes to repair the part, this will be done only if authorized by
CrustBuster®/Speed King, Inc. This warranty procedure is in addition to all remedies authorized
by law.
CRUSTBUSTER®/SPEED KING, INC.
Box 526
Spearville, KS 67876
Specifications are subject to change without notice. ® is a registered trademark of CrustBuster/Speed King, Inc.

Table of Contents
Identification and Warranty . . . . . . . . . . . . . . .
. Inside Front Cover
Specifications . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety............................. 2-8
Transporting Drill . . . . . . . . . . . . . . . . . . . . . . 9
Folding and Unfolding Drill. . . . . . . . . . . . . . 10
Field Operating Checklist. . . . . . . . . . . . 10-11
Field Operation:
All Plant Drill:
Setting Down Pressure . . . . . . . . . . . . 12
Setting Seed Depth . . . . . . . . . . . . 12-13
Minimum Tillage Conditions . . . . . . . . 13
Conventional Field Conditions . . . . . . 13
No-Till Conditions . . . . . . . . . . . . . . . . 13
Lubrication and Service. . . . . . . . . . . . . . 14
Scraper Adjustment. . . . . . . . . . . . . . . . . 14
Blade Gap Adjustment . . . . . . . . . . . . . . 15
Sprocket Box Operation. . . . . . . . . . . . . . . . 16
Seed Cup Adjustment and Service . . . . . . . 17
Sprocket Locations . . . . . . . . . . . . . . . . . . . 18
Sprocket Box Adjustment . . . . . . . . . . . . . . 19
Seed Rate Charts . . . . . . . . . . . . . . . . . 21-28
Illustrations and Repair Parts:
Center Drive . . . . . . . . . . . . . . . . . . . 29-30
Wing Drive. . . . . . . . . . . . . . . . . . . . . 31-34
Gearbox....................... 35-38
Clutch Lever Assembly . . . . . . . . . . . . . . 38
Center Frame Section . . . . . . . . . . . . . . . 39
Drive End Bracket & Bearing. . . . . . . . . . 40
TandemAxle...................... 40
8BoltHub........................ 41
Hitch ............................ 42
2-Point Hitch Option & Pin. . . . . . . . . . . . 43
Wing Carrier Adjustment . . . . . . . . . . . . . 43
Wing Frame Sections . . . . . . . . . . . . . . . 44
Fold and Pull Bar . . . . . . . . . . . . . . . . 45-47
Grain Box . . . . . . . . . . . . . . . . . . . . . 48-49
ToolBars......................... 50
Cylinder Depth Control Lock . . . . . . . . . . 51
All Plant Opener Assembly . . . . . . . . 52-53
All Plant Opener Blades . . . . . . . . . . . . . 54
Presswheel Assemblies . . . . . . . . . . 55-57
Outside Scraper Assy . . . . . . . . . . . . . . . 58
FeedTubes....................... 58
Hydraulics . . . . . . . . . . . . . . . . . . . . . 59-63
Lighting System . . . . . . . . . . . . . . . . . . . . 64
Shaft & Bin Monitor . . . . . . . . . . . . . . . . . 65
Specifications
Size & Number Weight w/
Spacing Openers All Plant Openers Min. HP
50' x 7½" 80 30,062 lbs. 200
50' x 10" 60 27,390 lbs. 200
50' x 15" 40 26,553 lbs. 200
(Opener offset center)
1

BE A SAFE OPERATOR
BY THINKING BEFORE ACTING
AND
BY READING
YOUR OWNER'S MANUAL
Avoid Accidents
Most accidents, whether they occur in indus-
try, on the farm, at home, or on the highway,
are caused by the failure of some individual to
follow simple and fundamental safety rules or
precautions. For this reason most accidents
can be prevented by recognizing the real
cause and doing something about it before the
accident occurs.
———————
Regardless of the care used in the design
and construction of any type of equipment,
there are many conditions that cannot be
completely safeguarded against without inter-
fering with reasonable accessibility and effi-
cient operation.
A CAREFUL OPERATOR
is the Best Insurance Against an Accident.
The complete observance of one simple rule
would prevent many thousands
of serious injuries each year.
That rule is:
Never Attempt to
Clean, Oil, or Adjust
A Machine While It Is In Motion.
To Our Customers
The following pages and illustrations are
printed to help supply you with the knowledge
to better operate and service your new
CrustBuster equipment.
We are proud to have you as a customer and
feel you will be proud to be a CrustBuster
owner.
Any piece of equipment needs, and must
have, a certain amount of service and mainte-
nance to keep it in top running condition. We
have attempted to cover all the adjustments
required to fit most conditions; however, there
may be times when special care must be taken
to fit a condition.
Study this owner's manual carefully and
become acquainted with all the adjustments
and operatingprocedures before attempting to
operate your new equipment. Remember, it is
a machine and has been designed and tested
to do an efficient job in most operating condi-
tions and will perform in relation to the services
it receives.
If special attention is required for some
condition, ask your CrustBuster dealer; he will
be glad to help and answer any questions on
operations and service of your new machine.
TAKE TIME FOR SAFETY
2

Safety
RECOGNIZE SAFETY INFORMATION
UNDERSTAND SIGNAL WORDS
FOLLOW SAFETY INSTRUCTIONS
3

Safety
OPERATE SAFELY
AVOID TIP-OVERS
KEEP RIDERS OFF MACHINE
4

Safety
HANDLE FUEL SAFELY - AVOID FIRES
PREPARE FOR EMERGENCIES
WEAR PROTECTIVE CLOTHING
USE SAFETY LIGHTS AND DEVICES
5

Safety
USE A SAFETY CHAIN
TRANSPORT SAFELY
6

Safety
TOW LOADS SAFELY
PRACTICE SAFE MAINTENANCE
7

Safety
AVOID HIGH-PRESSURE FLUIDS
CHARGE ROW MARKER
HYDRAULIC SYSTEM
DANGER: Indicates an imminently hazardous
situation which, if not avoided, will result in
death or serious injury.
WARNING: Indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION: Indicates a potentially hazardous
situation which, if not avoided, may result in
minor or moderate injury.
NOTICE: Used to address practices not related
to physical injury.
8

Before Unfolding and Operating This Equipment ---
Read and understand this owner's manual.
Transport & Safety Instructions
FWhen transporting drill, be aware you are towing a 30,000 lb. load with up to 8,187 lb. empty
hitch weight.
Tow width - 16' Tow length - 34'
Take appropriate precautions in stopping, turning, etc. DO NOT EXCEED 20 MPH.
Grain boxes are to be empty in transport to avoid exceeding the capacity of the
4750 drill center towing tires.
Follow tire manufacturer's recommendations regarding inflation for towing.
(Goodyear farm implement tire for highway and agriculture usage)
Mfg stated capacity @ 46 PSI = 8900 lb.
4750 Drill load per tow tire empty boxes = 5453 lb.
4750 Drill load per tow tire full boxes = 6341 lb.
FUse a minimum hitch pin of 1" with lock nut to towing vehicle. DO NOT use a hairpin or wire
to secure hitch pin. Make sure adequate safety chains are in place.
FNEVER use an unsecured pin in draw bar.
FBefore transporting, make sure transport locks are in place on the wing carrier arms located
under the hitch and on tool bar lift cylinders.
FLug bolts should be checked prior to towing, after 1 mile of transport, within the next 20 miles
and periodically thereafter. Check hubs for excess heating.
FMake sure center section drive wheel throw-out pin is disengaged when transporting
FMake sure 3-point linkages are raised completely to clear hitch.
FIf your tractor does not already have a lighting receptacle, install one. Always plug in the drill
lighting system to a correctly wired tractor and USE for transport safety. Wiring should be
extended into tow tractor for turn and stop light.
FConnect the 7 pin lighting plug to the tractor receptacle and use at all times. Confirm the
correct lights are operating if your tractor is not wired by industry standard code. Standard 7
pin receptacles are available through your dealer, local truck supply stores, and auto parts
facilities.
FBefore operating hydraulics, remove all transport locks or damage to drill will result.
FNever have more than 391 lbs. per section on the walkboards without drill securely attached
to tractor or towing vehicle.
CAUTION: Your drill weighs more than the towing vehicle. The drill is NOT
equipped with brakes. EXERCISE EXTREME CAUTION ! Maximum
allowable speed - 15 mph. NEVER ALLOW ANYONE TO RIDE
THE DRILL!
9

Fold and Unfold Instructions
FFolding or unfolding of drill should be done on nearly level ground with the tractor transmission
in neutral.
FWhen drill is plumbed with markers, the manual selector valve located at rear and top of hitch
will have to be shifted from marker to fold system.
FDuring the fold and unfold operation, be sure to stay clear of pull bar slides located at front top
of hitch.
FCheck that all wing carrier cylinder locks are removed.
FLower wings by rotating wing carrier arms down out of hooks on front of wing frames. Be sure
wing carrier arms are clear of wing frames before unfolding. Unfolding is complete when pull
bar slides are pulled back against stop, and locked in place by automatic locks located at front
top of hitch. When folding, automatic locks will release pull bar slides.
FBe sure wing carrier arms are lowered to clear wing frames when folding.
FWhen pull bars come together against bumpers, and rollers on wing carrier arms are centered
under guides on wing frames, drill is completely folded. Wings can now be raised.
FBe sure rollers are securely in hooks on wing frames.
FInstall cylinder locks on wing carrier lift cylinders.
FDrill is now ready for transport. USE GOOD JUDGEMENT AND SAFE OPERATING
PROCEDURES WHEN TRANSPORTING.
Field Operating Checklist
____ Remove ALL transport locks.
____ Inflate tires to recommended air pressure.
____ Lubrication as required.
____ Seed shafts turned manually to check for obstructions and improper chain alignment on drive
sprockets.
____ Correct sprocket selection and slot width for seed type and size.
____ Calibration as required for accuracy.
____ Drill adjusted at hitch for level field operation.
____ Cylinder stop set for proper toolbar rotation (Initial setting recommended - 1").
Both cylinders for each bar are set equally to avoid twisting tool bar.
____ Down pressure set for soil conditions.
____ Acre meter reset.
____ Lower drill while moving forward to avoid plugging openers.
____ Check seed depth and adjust accordingly.
____ Allow no riders.
____ After approximately 10 hours, check tool bar bolts, wheel bolts, presswheel swivel bolts, etc..
Make sure they are tight.
10

TOOL BAR LIFT CYLINDER SET
AT RECOMMENDED SETTING.
CYLINDER RETRACTED WITH
DEPTH SCREW STOP
TURNED OUT 1". THIS
MAKES CYLINDER LENGTH
FROM PIN HOLE TO PIN
HOLE 21¼” AS SHOWN.
NOTE: SET BOTH
CYLINDERS PER TOOL
BAR THE SAME TO
PREVENT TWISTING OF
TOOL BAR.
Field Operation
Recommended Operating Speed
Operating speeds of 4-7 mph will provide
optimum results from your Min-Till and All Plant
drill. Conventional field conditions can warrant
speeds in the upper end of the range. High levels
of "tough" residue due to morning dew or recent
moisture, rough field conditions, rocky fields, or
hard ground may require lower speeds for
adequate performance.
Recommended Adjustment
Procedure
Setting your drill requires adjustments be made in
a particular order to ensure the opener will work
properly. You will find it much easier to set the
drill if adjustments are made in the following
order:
1. Level the drill
2. Set toolbar rotation
3. Set down pressure
4. Set seed depth
Leveling the Drill
It is important to level the drill from front to back
first. The tongue and box should be as close to
level as you can get it by changing the drawbar
height on the tractor (on offset drawbars), or by
repositioning the clevis or mono hitch mounting.
Any time a different tractor is hooked to the drill you
should recheck level.
Clevis
Positions
All Plant Drill
Opener and Tool Bar
Adjustments
The All Plant units are attached to a 4x4 bar that
is rotated by two cylinders on each section of
the drill. Each cylinder uses a screw adjustable
depth stop on the cylinder rod. The adjustable
depth stop should be set to rotate the 4x4 bar
square to the 7x7 frame in all conditions.
After the drill is leveled, rotation of the toolbar
must be set. Using the screw adjustable stop
on the lift cylinder, adjust rotation of the toolbar
with the screw adjustment turned out 1" for an
initial recommended setting. Adjustment range
of the presswheel depth quadrant will be
affected if the toolbar does not rotate far enough
or goes beyond perpendicular. If the toolbar is
not set correctly, the opener travel range
will not allow for penetration into low
areas or provide clearance when
meeting obstructions.
Check that both tool bar lift cylinders
on each section are set the same.
DAMAGE TO TOOL BAR WILL
RESULT IF THEY ARE NOT SET THE
SAME.
11

All Plant Drill
Setting Down Pressure
The parallel linkage opener design assures the
operator the opener blades and presswheel
operate on the same level throughout the range
of up and down travel. Due to the location of the
down pressure spring, the pressure applied to
the opener remains relatively constant in the
entire range of travel. Changing the spring
position from the first (top) notch to the last
(bottom) notch provides 5 different levels of
force. Each notch represents approximately
these amounts of down pressure:
1 2
Spring Springs
Notch 1 (top) . . . . . . . 120# 200#
Notch 2 . . . . . . . . . . . 160# 260#
Notch 3 . . . . . . . . . . . 200# 330#
Notch 4 . . . . . . . . . . . 240# 400#
Notch 5 . . . . . . . . . . . 260# 500#
It may be necessary to add ballast to the drill in
the third or fourth notch. In order that all the
opener springs are able to achieve the down
pressure selected, the total weight of the drill
must equal that amount of pressure times the
number of row units on the drill. The parallel
linkage arms should have a "live working action"
during field operation. Setting the drill for too
much down pressure without adequate weight
will reduce the ability of the opener to flex and
give good performance.
To determine the correct amount of down
pressure, begin with the unit set in the lightest
setting and the presswheel adjusted all the way
up (or deepest setting). Put the openers in the
ground and pull forward 50-100 feet. Stop and
check opener penetration. If the opener is not
penetrating to the depth you wish to plant, rotate
toolbar upwards until clear of the ground, and
add one more notch of down pressure. Repeat
the process until the opener will penetrate to at
least the depth you wish to plant.
Additional Weighting
When operating the All Plant drill in hard ground
conditions, it will be necessary to add weight to
the frame. Optional weight bars are available to
place into 7x7 main frame. Simply remove the
bolted end caps and slide weight bars into the
frame.
.WEIGHT BARS
Setting Seed Depth
Depth settings are achieved by moving the
depth quadrant to affect the presswheel
relationship to the opener. Changes are made
by releasing the spring-loaded lock handle and
moving the quadrant up or down with the hand
slot. LOWERING the quadrant will set seed
depth shallow --RAISING the quadrant will set
seed depth deeper. Irregular seed placement
can be caused by excessive field speed,
residue hairpinning, rocky conditions, and
cloddy or wet soil conditions.
12

All Plant Drill
Setting Seed Depth - (cont.)
Minimum Tillage Conditions
The most challenging condition is often presented
when a high level of residue is present in a "loose"
soil environment. The opener blades will not cut
residue cleanly and can often have a tendency to
push or "bulldoze" residue ahead of the opener
discs.
For minimum tillage operations, the lightest spring
(top notch) is recommended. Firming the ground
using a culti-packer or similar tool can aid in
packing the residue for better cutting and blade
penetration with less hairpinning.
The All Plant drill will work well in minimum tillage
conditions if a "stale seedbed" is created. Soil
worked at an earlier date, and allowed to firm and
crust over can give the opener more resistance,
allow for better cutting action, and create a firmer
seed furrow. The first or second notch will
usually provide enough down pressure to
penetrate the soil.
Conventional Field Conditions
For tilled field conditions, the lightest spring
setting (top notch) is recommended. More weight
will be transferred to the carrying wheels of the
drill when the toolbar is rotated. Behind tractor
and drill tires it may be necessary to adjust
individual row units for extra down pressure or
different depth setting. Setting the drill in
conventional tillage will be easier if the tillage
trips are kept shallow (2" - 4").
If the first notch presents too much down
pressure, the down pressure spring can be
removed. With the spring removed, the effective
down pressure of the opener is approximately
60#.
To remove spring, rotate tool bar until openers are
clear of ground. This will release tension on
spring allowing the removal of ½" x 6" bolt at the
top of the spring. Unhook spring from rod at
bottom of opener mount. When replacing spring,
make sure the long hook end of spring is down.
No-Till Conditions
No-till presents many different conditions.
Residue level and condition, previous tillage strips
(ridges, plow dead furrows), soil type, soil
moisture and rocky conditions all increase the
demands on the no-till drill. Many variables and
conditions not removed by tillage trips require
greater attention to settings and speed. In some
circumstances, it may be desirable to drill at a
slight angle to existing rows. This will also
randomize the opener disc wear and extend the
maintenance interval for new blades.
As a general rule, less than ideal conditions will
require slower speeds, to reduce hairpinning,
improve opener penetration and residue cutting,
reduce rock damage, and maintain good furrow
formation and seed placement.
It is recommended you set the drill beginning with
light down pressures and work your way up to
heavier settings. If the presswheel presses firmly
on the seed slot and control depth evenly, it is
unnecessary to add more pressure. When
increased down pressure does not improve
penetration, or carrying wheels lose ground
contact (and seed drive shaft stops), begin adding
ballast with weight bars.
13

Lubrication and Service
Proper maintenance will extend the life of your drill. Refer to the list and drawings below and drawings
in the repair parts section for lubrication requirements. Use a high quality grease in bearings and pivot
points. On greaseable sealed bearings, be careful not to over grease and destroy the dirt seal. Oil
chains with a chain lube. A light penetrating oil or liquid graphite should be used on seed cups initially
and at the end of each season.
1 Front pull bar slides as needed
2 Wing carrier rollers and wing carrier
arms as needed
3 Fold hinges as needed
4 Fold flex arms as needed
5 Center drive engage and disengage
sprocket once per season
6 Drive line bearings (See drive line
assembly) once per season
7 Clutch halves (See drive line
assembly) every day
8 Sprocket box bearings (See gearbox
assembly) once per season
9 Wing wheel bearings once per
season
10 Tool bar pivots every day
11 Presswheel pivots every day
12 Marker mount and swivel every day
13 3-Point Hitch as needed
Scraper Adjustment
Opener blade inside scrapers are spring loaded
and require no adjustment. To replace the
scraper blades, remove the rear lock nut and
slide both blades from the stem. Assemble with
new blades and replace onto stem being careful
not to over tighten lock nut.
SPRING LOADED SCRAPER
NOTE: Do not over tighten lock nut. Be
sure scrapers move freely. Failure
to do so will result in damage to
scrapers and proper operation of
scrapers.
14

Blade Gap Adjustment
Offset blade designs form better seed furrows
and penetrate and cut in tougher planting condi-
tions. If using the ALL PLANT opener, as the
blades wear the gap between blades will
increase. Removing each blade from the opener
bracket allows the operator to take shim washers
from behind the bearing and re-adjust the blade
gap for better performance. Shim washers that
are removed must then be placed on outside of
blade to maintain length of bolt. Maintain a 1/8" to
3/16" clearance between blades, measuring at
the pinch point. Inadequate clearance will in-
crease wear on the inside of the lead blade and
mean quicker replacement. The lead blade
changes sides on the opener on each half of the
drill. The right blade on ALL PLANT openers is
installed with a right hand threaded bolt. The left
blade is installed with a left hand threaded bolt.
If the MIN-TILL opener is used, the offset design
is achieved by using a 15" leading blade and a 13"
trailing blade. One bolt and lock nut secures both
blades in the proper angle by tightening the bear-
ing races against the opener bracket. Be sure to
hold the bolt as the nut is removed or replaced.
The bolt is bent to the proper angle for the blades
to meet at the front pinch point. Since it is mount-
ed with one bolt, the MIN-TILL opener blades
require no gap at the pinch point. Shim washers
may be needed to achieve this. When tightening
blades, rotate the bent bolt until bearing races are
flat and flush against beveled surface of opener
blade bracket.
ALL PLANT opener shown
Tandem Wheel Drive Clutch
The tandem wheel on the center section that
drives a seed shaft is manufactured with a man-
ual throw-out type clutch.
IMPORTANT: This will need to be disengaged
before road transport.
On the wing sections, tandem wheels that drive a
seed shaft are manufactured with a friction disc
type clutch. If the drive wheel encounters a hole,
ridge, or other situation that may cause a delay in
adequate ground contact, the other wheel will "take
over" driving the seed shaft. During turns, or in the
folding operation, it is necessary the non-drive
wheel can free wheel.
The tire is bolted to the hub using three tap bolts
with tapered wheel nuts and three wheel bolts.
The three tap bolts also bolt on the clutch drive
plate to the backside of the hub. If the wheel must
be removed for service, remove ONLY the three
tapered wheel nuts and three wheel bolts. Pres-
sure on the two friction discs has been factory set.
As drill is used, this may have to be adjusted. This
is done by tightening the four nylock lock nuts and
compressing the four rubber springs to the desired
pressure for wheel slippage. This must be done
with equal pressure on all four springs. DO NOT
over tighten the four rubber spring bolts, as this will
cause damage to the tire and wheel assembly, and
the clutch housing.
CAUTION!
At the start of a new drilling season, or anytime the
drill is going to be used, especially if the drill has
been stored out in the weather all winter long,
make sure the clutch drive is not frozen up.
Failure to do this will result in damage to the clutch
assembly.
To make sure the clutch is not frozen up, loosen
up the clutch bolts. This should free the disc
torque limiter. If not, use a knife to free the torque
limiter from one or the other. Reset clutch back to
where it was. Do Not use any oil or penetrating oil
of any kind.
ENGAGED DISENGAGED
CENTER DRIVE CLUTCH
WING DRIVE CLUTCH
15

Calibration, Seed Rates and Sprocket Box
Calibration/Drilling Rates
Planting the right rate can be frustrating. Some-
times the end result is not what the rate chart
indicates. Seeding rate is affected by seed size,
seed treatments, foreign material, test weight,
and tire air pressure.
1. Always plant clean seed.
2. Check tire air pressure.
3. Seed treatments vary by type and time of
application.
Some seeds are treated at the processor. Drill
box treatments are common methods of applica-
tion. Each of these can "gum" up the wobble’ slot
cup halves and reduce final seeding rate. Treated
seed often flows differently than non-treated seed.
A general method for checking quantities drilled is
as follows:
1. Set drill for desired seeding rate.
2. Fill the box level; then pull drill for a short
distance to settle seed. Refill box exactly
level full.
3. Drill a calculated one acre.
4. Carefully weigh the seed required to refill the
box level full. Box capacity:
4750 62 bushels per wing
4750 53 bushels center box
5. Compare the amount used versus that stated
on the rate chart.
6. Adjust seeding rate by changing the sprocket
combination or wobble slot width.
One method involves catching seed from one or
more seed cups and utilizing a density scale to
determine actual rates. These scales are com-
mercially available, inexpensive and very easy to
use. Information can be obtained from
CrustBuster®/Speed King, Inc.
Sprocket Box Operation
The sprocket box design will enable the operator
to set a wobble slot width once for a given seed
size and change rates by changing the speed of
the seed shaft. Choose a range of seeding rates
that you wish to operate in, set the slot width as
indicated by the chart and simply change knob
position with the slide handle to effect seed rate.
A narrow slot width will produce more even
distribution and spacing in the row.
When changing derailleur, be sure openers
are rotated out of ground.
To change position, move throw-out lever toward
the rear to disengage the chain from the lower
sprocket. Pull the spring loaded collar outward
with two fingers and slide side to side to the
desired gear position. Pull throw-out lever for-
ward to re-engage the chain.
16

Wobble Slot Seed Cup Adjustments and Service
The wobble slot seed cups should be checked
against the slot gauge initially and anytime ser-
vice has been performed on the seed shaft or
individual seed cups. Refer to the drawing below
for proper adjustment if repairs have been made.
To verify that all seed cups are set the same on
the shaft, start with all cups fully closed. A slight
crack between the cup halves would be consid-
ered normal tolerance. If any individual cup is not
"zeroed out," open the slot width using the adjust-
ing handle, loosen allen set screws and adjust to
equal others on shaft.
To determine if the gauge is reflecting the correct
seed cup slot width, open the seed cups using
the adjusting handle. Notice that wobble slot
halves are positioned differently on the hex shaft.
Identify a cup that will accept a piece of ½"
keystock or other measuring device comfortably
and give solid
contact against each half. It may be necessary to
turn the hex shaft slightly to position the particular
seed cup correctly. Close the slot width firmly
against the measuring device. At the cup next to
the wobble slot adjusting handle, position the
gauge to equal the slot width you have just mea-
sured with the keystock by loosening with a
screwdriver and sliding in or out.
Small changes in rate can be made by opening or
closing slot width. To close the slot width with
grain in the box, close the slot down a maximum
of 1/8" and then rotate the shaft one turn to clear
the slot. Repeat this process until the desired
slot width is selected.
Seeding rate is affected by seed size, seed
treatments, foreign material, and test weight.
Refer to seed rate charts as guidelines for
desired seeding rates.
Chain Tension on Drive Shaft
When making sprocket changes to the seed
shaft, tighten chain to leave approximately 1/2"
of flex. The final sprocket must allow the hex
shaft to slide within the sprocket when the
adjusting lever is moved. If the chain is too
tight, bowing and binding of box end will occur
making seed cup adjustment difficult. Lightly
lubricate the shaft where the sprocket will
slide. DO NOT OVERTIGHTEN CHAIN.
17

Sprocket Locations
4750 Center Section
18