Great Plains 7552 Operator Manual
Operator’s Manual
Series VII 6326, 6328, 6536, 6542, 7333, 7336, 7548 & 7552
Discovator (Disc & Coulter)
Manufacturing, Inc.
Read the operator’s manual entirely. When you see this symbol, the subsequent
!
instructions and warnings are serious - follow without exception. Your life and the
lives of others depend on it
Cover illustration may show optional equipment not supplied with standard unit.
©Copyright 2004 Printed 8/11/2008 550-221M
Great Plains Mfg., Inc. First Page ► Table of Contents
Table of Contents
Important Safety Information .......................... 1
Safety Rules................................................... 6
Safety Decals ................................................ 7
Introduction ........................................................ 12
Description of Unit........................................ 12
Using this Manual ........................................12
Definitions.............................................. 12
Owner Assistance .......................................... 12
Assembly and Setup Assistance .................... 13
Product Support .....................................13
Pre-Assembly Checklist ........................ 13
Section 1 Assembly ............................................. 14
Center Frame, Torque Tube & Walking
Beam Assembly ....................................... 14
Inside Wing and Wheel Arm Assembly .......15
Brace Bar, Wing Brace & Rocker/Fold
Bracket Assembly .................................... 16
Outside Wing Assembly ............................... 17
Connecting Outside Wing and Wing Brace
Assembly ................................................. 18
Center Gang & Gang Hanger Assembly. ...... 19
Center Truss, Hitch and Strut Assembly ...... 20
Hitch Tongue, Side Plate and Level Bar
Assembly ................................................. 21
Center Lift Cylinder, Rest Pads and
Hydraulic Valves Assembly ................... 22
Fold Cylinders, Rocker Arm and 3” Rollers
Assembly ................................................ 23
Center Wing Stop and Outside Wing Stop
Assembly ................................................ 24
Front Gauge Wheel Assembly .....................25
Hydraulic Gauge Wheel Assembly .............. 26
Completing Setup ......................................... 27
Section 2 Hydraulics .......................................... 28
Hydraulic Layout: 6326, 6328, 7333, 7336... 28
Hydraulic Layout: 6536................................. 30
Hydraulic Layout: 6542, 7548 & 7552 .........32
Hydraulic Gang Layout ................................ 34
Section 3 Replacement Parts .............................36
Magnum Shank Assembly ............................ 36
K-Flex Shank Assembly ............................... 38
Disc Gang Assembly .................................... 40
Disc Gang Identification .............................. 42
Coulter Gang Assembly ...............................44
Coulter Gang Identification .......................... 46
Center Walking Beam 6300DV (All S/N)
& 7300DV (S/N 1226DD-)...................... 48
Center Walking Beam 6500DV
(S/N 1329DD+) ....................................... 50
Center Walking Beam 7333DV
(S/N 1227DD+)........................................ 52
Center Walking Beam 7500DV ................... 54
Wing Walking Beam Assembly ................... 56
6536 & 6542 Outside Wing Transport
(Standard Hub) ........................................ 58
(Optional Heavy Hub) ............................. 60
8 & 6-Bolt Heavy Hub & Spindle Assy.
(S/N 1329DD+) ....................................... 62
6-Bolt Hub & Spindle Assembly ................. 64
Front Gauge Wheel Assembly ..................... 66
Hydraulic Gauge Wheel Assembly .............. 68
Section 4 Machine Layout ................................. 70
6326D Machine Layout, Disc ...................... 70
6326C Machine Layout, Coulter .................. 71
6328D Machine Layout, Disc ...................... 72
6328C Machine Layout, Coulter .................. 73
6536D Machine Layout, Disc
Single Fold (S/N 1329DD+) ................... 74
Double Fold (S/N 1329DD+) .................. 76
6536C Machine Layout, Coulter
Single Fold (S/N 1329DD+) ................... 78
Double Fold (S/N 1329DD+) .................. 80
6542D Machine Layout, Disc
(S/N 1329DD+) ....................................... 82
6542C Machine Layout, Coulter
(S/N 1329DD+) ....................................... 84
7333D Machine Layout, Disc
(S/N 1227DD+) ....................................... 86
7333C Machine Layout, Coulter
(S/N 1227DD+) ....................................... 87
7336D Machine Layout, Disc ...................... 88
7336C Machine Layout, Coulter .................. 89
7548D Machine Layout, Disc ...................... 90
7548C Machine Layout, Coulter .................. 92
7552D Machine Layout, Disc ...................... 94
7552C Machine Layout, Coulter .................. 96
1/19/2006 Series VII 6326-7552 Discovator 550-221M
Table of Contents Table of Contents ► Great Plains Mfg., Inc.
Section 5 Operating and Maintenance..............98
Prior to Going to the Field ............................ 98
First Time Machine Setup and Adjustments 98
General Operating Instructions and
In-Field Adjustments ............................... 100
Maintenance and Lubrication ....................... 102
Section 6 Specification and Capacities ............. 103
Appendix ............................................................. 104
Torque Values for Common Bolt Sizes ....... 104
Tire Inflation Chart ...................................... 104
Warranty ....................................................... 105
Series VII 6326-7552 Discovator 550-221M 1/19/2006
Great Plains Mfg., Inc. First Page ► Table of Contents
©
Copyright 2004 All rights Reserved
Great Plains Manufacturing, Inc. provides this publication “as is” without warranty of any kind, either expressed or implied. While every precaution has been
taken in the preparation of this manual, Great Plains Manufacturing, Inc. assumes no responsibility for errors or omissions. Neither is any liability assumed for
damages resulting from the use of the information contained herein. Great Plains Manufacturing, Inc. reserves the right to revise and improve its products as it
sees fit. This publication describes the state of this product at the time of its publication, and may not reflect the product in the future.
The following are trademarks of Great Plains Mfg., Inc.: Application Systems, Ausherman, Land Pride, Great Plains
All other brands and product names are trademarks or registered trademarks of their respective holders.
Great Plains Manufacturing, Incorporated Trademarks
Printed in the United States of America.
1/19/2006 Series VII 6326-7552 Discovator 550-221M
Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
R
Important Safety Information
Look for Safety Symbol
The SAFETY ALERT SYMBOL indicates there is
a potential hazard to personal safety involved
and extra safety precaution must be taken.
When you see this symbol, be alert and carefully
read the message that follows it. In addition to
design and configuration of equipment, hazard
control and accident prevention are dependent
upon the awareness, concern, prudence and
proper training of personnel involved in the
operation, transport, maintenance and storage of
equipment.
Be Aware of Signal Words
!
Signal words designate a degree or level of hazard seriousness.
DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death
or serious injury. This signal word is limited to
the most extreme situations, typically for
machine components that, for functional
purposes, cannot be guarded.
WARNING indicates a potentially hazardous
situation, which, if not avoided, could result in
death or serious injury, and includes hazards
that are exposed when guards are removed. It
may also be used to alert against unsafe
practices.
CAUTION indicates a potentially hazardous situation, which, if not avoided, may result in minor
or moderate injury. It may also be used to alert
against unsafe practices.
!
DANGE
!
WARNING
!
CAUTION
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Important Safety Information Table of Contents ► Great Plains Mfg., Inc.
Be Familiar with Safety Decals
• Read and understand “Safety Decals,” page
7, thoroughly.
• Read all instructions noted on the decals.
Keep Riders Off Machinery
• Riders obstruct the operator’s view. Riders
could be struck by foreign objects or thrown
from the machine.
• Never allow children to operate equipment.
• Keep all bystanders away from machine dur-
ing operation.
Shutdown and Storage
• Lower Series VII Discovator, put tractor in
park, turn off engine, and remove the key.
• Secure Series VII Discovator using blocks
and supports provided.
• Detach and store Series VII Discovator in an
area where children normally do not play.
Use Safety Lights and Devices
• Slow-moving tractors and towed implements
can create a hazard when driven on public
roads. They are difficult to see, especially at
night.
• Use flashing warning lights and turn signals
whenever driving on public roads.
• Use lights and devices provided with implement.
OFF
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Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
Transport Machinery Safely
Maximum transport speed for implement is 20
mph. Some rough terrains require a slower
speed. Sudden braking can cause a towed load
to swerve and upset.
• Do not exceed 20 mph. Never travel at a
speed which does not allow adequate
control of steering and stopping. Reduce
speed if towed load is not equipped with
brakes.
• Comply with state and local laws.
• Do not tow an implement that, when fully
loaded, weighs more than 1.5 times the
weight of towing vehicle.
• Carry reflectors or flags to mark tractor and
implement in case of breakdown on the
road.
• Keep clear of overhead power lines and
other obstructions when transporting. Refer
to transport dimensions under
“Specifications and Capacities,” page 103.
• Do not fold or unfold the wings while the
tractor is moving.
Avoid High Pressure Fluids
Escaping fluid under pressure can penetrate the
skin, causing serious injury.
• Avoid the hazard by relieving pressure
before disconnecting hydraulic lines.
• Use a piece of paper or cardboard, NOT
BODY PARTS, to check for suspected
leaks.
• Wear protective gloves and safety glasses
or goggles when working with hydraulic
systems.
• If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be
surgically removed within a few hours or
gangrene may result.
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Important Safety Information Table of Contents ► Great Plains Mfg., Inc.
Practice Safe Maintenance
• Understand procedure before doing work.
Use proper tools and equipment. Refer to
this manual for additional information.
• Work in a clean, dry area.
• Lower the Series VII Discovator, put tractor
in park, turn off engine, and remove key
before performing maintenance.
• Make sure all moving parts have stopped
and all system pressure is relieved.
• Inspect all parts. Make sure parts are in
good condition and installed properly.
• Remove buildup of grease, oil or debris.
• Remove all tools and unused parts from
Series VII Discovator before operation.
Prepare for Emergencies
• Be prepared if a fire starts.
• Keep a first aid kit and fire extinguisher
handy.
• Keep emergency numbers for doctor, ambulance, hospital and fire department near
phone.
Wear Protective Equipment
• Wear protective clothing and equipment.
• Wear clothing and equipment appropriate for
the job. Avoid loose-fitting clothing.
• Because prolonged exposure to loud noise
can cause hearing impairment or hearing
loss, wear suitable hearing protection such
as earmuffs or earplugs.
• Because operating equipment safely
requires your full attention, avoid wearing
radio headphones while operating
machinery.
911
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Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
Handle Chemicals Properly
• Agricultural chemicals can be dangerous.
Improper use can seriously injure persons,
animals, plants, soil and property.
• Read and follow chemical manufacturer’s
instructions.
• Wear protective clothing.
• Handle all chemicals with care.
• Avoid inhaling smoke from any type of
chemical fire.
• Store or dispose of unused chemicals as
specified by chemical manufacturer.
Use A Safety Chain
• Use a safety chain to help control drawn
machinery should it separate from tractor
drawbar.
• Use a chain with a strength rating equal to or
greater than the gross weight of towed
machinery.
• Attach chain to tractor drawbar support or
other specified anchor location. Allow only
enough slack in chain to permit turning.
• Replace chain if any links or end fittings are
broken, stretched or damaged.
• Do not use safety chain for towing.
Tire Safety
• Tire changing can be dangerous and should
be performed by trained personnel using
correct tools and equipment.
• When inflating tires, use a clip-on chuck and
extension hose long enough to you to stand
to one side–not in front of or over tire
assembly. Use a safety cage if available.
• When removing and installing wheels, use
wheel-handling equipment adequate for
weight involved.
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Important Safety Information Table of Contents ► Great Plains Mfg., Inc.
Safety Rules
• Thoroughly read and understand the
instructions in this manual before operation.
Read all instructions noted on the safety
decals.
• Be familiar with all Series VII Discovator
functions.
• Operate machinery from the driver’s seat
only.
• Do not leave Series VII Discovator unattended with tractor engine running.
• Do not transport Series VII Discovator
the transport pins and all wing locks are
installed.
• Limit transport speed to 20 m.p.h.
• Know the transport height of your unit and be
extremely careful of overhead electrical and
telephone lines when transporting the unit.
• Know the transport width of your machine and
the width of bridges, etc… on the transport
route.
• Make sure that no one is near the machine
during field operation and folding or unfolding
of wing sections.
• Prior to removing any lift cylinders from the
machine, lower implement to the ground, shut
off the tractor and release the pressure in the
lines.
• Do not depend on cylinders to hold the weight
of machine during storage; use the transport
locks.
• Do not walk or stand on any part of the
machine. Never allow anyone to ride on the
Series VII Discovator.
• Use extreme care when hitching or unhitching
the machine from the tractor. In some
situations with a heavy finishing attachment,
the machine may tip backward causing the
hitch to rise rapidly.
• Never stand with feet under any part of the
machine.
until
• Never allow anyone to walk between the
tractor and Series VII Discovator while
machine is in operation.
• Keep hands and feet away from turbo blades.
They are quite sharp.
• Any moving piece of equipment is potentially
dangerous. Do not operate until you are
absolutely sure the area is clear of children,
pets and irresponsible persons.
• Escaping hydraulic fluid under pressure can
have sufficient force to penetrate the skin,
causing serious injury. To prevent injury
when working with hydraulics, follow the
instructions on page 3.
• Before transporting the unit on public roads,
check to make sure the safety reflectors are
clean and visible, and not missing or
damaged. Turn on tractor warning lights
when transporting.
• Make sure all safety signs are clean, readable
and not damaged. Contact Great Plains Mfg.
for free replacements if necessary.
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Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
Safety Decals
Your implement comes equipped with all safety
decals in place. They were designed to help you
safely operate your implement.
• Read and follow decal directions.
• Keep all safety decals clean and legible.
• Replace all damaged or missing decals. Order
new decals from your Great Plains dealer.
Refer to this section for proper placement.
• When ordering new parts or components, also
request corresponding safety decals.
• To install new decals:
1. Clean the area on which the decal is to be
placed.
2. Peel backing from decal. Press firmly on
surface, being careful not to cause air
bubbles under decal.
Slow Moving Vehicle Emblem
Quantity 1
Reflector – Amber
838-615C
Quantity 6: Two on light bracket and two on
center brace bar. Two on rear of finishing
attachment (not shown), visible from side
while folded for transport.
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Important Safety Information Table of Contents ► Great Plains Mfg., Inc.
Reflector – Red
838-614C
Quantity 2:
Reflector – Florescent Orange
838-603C
Quantity 2:
Caution
838-598C
Quantity 1
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Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
Danger Electrocution Hazard
838-599C
Quantity 1
Danger Crushing Hazard
838-600C
Quantity 1
Warning Overhead Wing Hazard
838-602C
Quantity 4: 6326, 6328, 7333 & 7336
Quantity 6: 6536, 6542, 7548 & 7552
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Important Safety Information Table of Contents ► Great Plains Mfg., Inc.
Warning High Pressure Fluid Hazard
838-610C
Quantity 1
Warning Crushing Hazard
838-611C
Quantity 1
Series VII 6326-7552 Discovator 550-221M 3/31/2004
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Great Plains Mfg., Inc. Table of Contents ► Important Safety Information
Warning Wing Falling Hazard
838-612C
Quantity 2
Notice
838-613C
Quantity 1
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Introduction Table of Contents ► Great Plains Mfg., Inc.
Introduction
Great Plains welcomes you to its growing family of
new product owners. This implement has been
designed with care and built by skilled workers
using quality materials. Proper assembly,
maintenance and safe operation will help you get
years of satisfactory machine use from your
machine. To ease the assembly task and produce
a properly working machine, read this entire
manual before assembling or setting up new
equipment.
Description of Unit
The Series VII 6326-7552 Discovator is a three or
five-section field finishing, one-pass tillage tool.
Working width ranges from 26 to 52 feet. The
implement is designed to combine discing/slicing,
cultivating, harrowing and herbicide incorporation
in a single pass. Various finishing attachments
are available to customize your tillage and residue
requirements for your operation.
Using This Manual
This manual will familiarize you with safety,
assembly, operation, adjustment, troubleshooting
and maintenance. Read this manual and follow
the recommendations to help ensure safe and
efficient operation.
The information in this manual is current at printing. Some parts may change to assure top
performance.
Definitions
The following terms are used throughout this
manual.
Right and left as used in this manual are deter-
mined by facing the direction the machine will
travel while in use unless otherwise stated.
IMPORTANT: A crucial point of information
about the preceding topic. For safe and correct
operation, read and follow the directions provided
before continuing.
NOTE: Useful information about the preceding
topic.
Owner Assistance
If customer service or repairs are needed, contact
your Great Plains dealer. They have trained
personnel, parts and service equipment specially
designed for Great Plains products.
Your machine’s parts should only be replaced with
Great Plains parts. Always use the serial and
model number when ordering parts from your
Great Plains dealer. The serial-number plate is
on the center section of the implement on the front
frame tube.
Record your implement model and serial numbers
here for quick reference.
Model Number: __________________________
Serial Number: ___________________________
Your Great Plains dealer wants you to be satisfied
with your new machine. If you do not understand
any part of this manual or are not satisfied with
the service received, please take the following
actions:
1. Discuss the matter with your dealer’s service
manager. Make sure they are aware of any
problems so they can assist you.
2. If you are still not satisfied, seek out the
dealership owner or general manager.
3. For further assistance, write to:
Product Support
Great Plains Mfg. Inc.
Service Department
607 Main Street
Tipton, KS 67485
Series VII 6326-7552 Discovator 550-221M 3/31/2004
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Great Plains Mfg., Inc. Table of Contents ► Introduction
Assembly and Setup Assistance
To order additional copies of operator’s and parts
manuals, write to the following address. Include
model numbers in all correspondence.
If you do not understand any part of this manual
or have other assembly or setup questions, assistance is available. Contact
Product Support
Great Plains Mfg. Inc., Service Department
607 Main Street
Tipton, KS 67485
Phone (800) 255-9215
Pre-Assembly Checklist
• Before assembling, read and understand “Im-
portant Safety Information,” beginning on
page 1.
• Have at least two people on hand while as-
sembling.
• Make sure assembly area is level and free of
obstructions (preferably an open concrete area).
• Have all major components.
• Have all fasteners and pins shipped with
Series VII Discovator.
• IMPORTANT: If a pre-assembled part or fas-
tener is temporarily removed, remember
where it goes. Keep the parts separated.
• Have a copy of the parts manual on hand. If
unsure of proper placement or use of any part
or fastener, refer to the parts manual.
• Check that all working parts are moving free-
ly, bolts are tight, and cotter pins are spread.
8/11/2008 Series VII 6326-7552 Discovator 550-221M
13
Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Assembly
This section covers the proper assembly of the implement. The reference numbers on the
figures give you an indication of the order of assembly. For a complete breakdown of any part not
shown in this assembly section, refer to the parts manual for proper location. Refer to the Appendix
for proper bolt torque values.
Center Frame, Torque Tube & Walking Beam Assembly
After uncrating the machine, place the
center frame (1) Figure 1, in the center of your
work area on stands. Pin the torque tube (2) to
the center frame with the 1¼ x 6 pins (3) and
1¼ x 7 pin (4) in center. Secure them with 3/8 x
2¼ GR 8 hex bolts (5) & lock nuts.
Slide the pivot spindle of the walking
beam assembly (6) into the sleeve at the end of
the torque tube wheel arm. It is a good idea to
put some form of anti-seize on the spindle
before you insert it. Line up the hole in the
spindle with the hole in the sleeve and secure
with 5/16 x 4 hex bolt (7) with lock washer and
hex nut.
When both walking beams have been
installed, bolt on the center transport tires (8),
using 1/2” or 5/8” lug nuts (9). See Section 3
Replacement Parts for proper transport parts
and sizes for your machine model.
Figure 1
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Inside Wing and Wheel Arm Assembly
Bolt the inside wing frames (1) Figure
2, to the center frame with three 1 x 6 hex bolts
(2) with nylon lock nuts (3). Draw the nuts
down tight but do not torque
Once the wings are attached, insert the
wheel arm bracket (4) into the wing frame
hangers and secure it just as you did on the
center with 1¼ x 6 pins (5). Secure the pins
with 3/8 x 2¼ GR 8 hex bolts (6) & lock nuts.
Install the wing walking beam assembly
(7) as shown in Figure 2 with the long 14” or
.
heavy hub 14 ½”, spindle toward the front. Use
anti-seize material on spindle. Secure the pivot
spindle in the sleeve with the 5/16 x 3 clevis
pin (8) and 1/8 x 1 cotter.
Bolt the 9.5L x 15, 8-ply tire (9) in
place with the ½ x 1¼ lug bolts (10), or ½” lug
nuts for heavy hub option. On 5-Section
models, bolt the 5” bolt on stub (11) to the
wing frame using 5/8 x 1½ hex bolts (12),
using lock washers and hex nuts.
Figure 2
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Brace Bar, Wing Brace & Rocker/Fold Bracket Assembly
Install the 1 x 7½ or the 1¼ x 9½ eyebolt (1) Figure 3, in the mounting bracket at the
back of the wing with a jam nut on each side of
the bracket. Install the 3¼ x 8 (3 3/4 x 8 for
7548 & 7552) rephasing wing cylinder (2)
between the eyebolt and the lever on the wheel
bracket. Pin the cylinder with 1 x 3 clevis pins,
1” machine washers and 3/16 x 2 cotter pin.
Bolt the center brace bar (3) and wing
brace bar (5) to the front of the center frame
and wing frame with ¾ x 2 hex bolts (4) with
lock washers and hex nuts. Do not tighten
bolts. Use a 1 x 6 hex bolt (6) and nylon lock
nut in the hinge. Draw nut tight but do not
torque. Tighten all other bolts evenly to
prevent bind at hinge.
Bolt the front (and rear on larger
models) center fold bracket(s) (7) to the center
frame with two ¾ x 2½ hex bolts (8) with lock
washer and hex nuts.
rocker/fold bracket(s) (9) to the wing using two
¾ x 2½ hex bolts (10) with lock washers and
hex nuts, along with two 5/8 x 3 x 5½ u-bolts
(11) with lock washer and hex nuts. The front
bracket uses a ¾ x 5 bolt (12) to attach the
outer end. The rear bracket uses four 5/8 x 1½
bolts (13) with lock washers and hex nuts to
attach the outer end. Bolt the inside hinge (14)
to the wing brace using 5/8 x 1½ bolts (15) and
one 5/8 x 3 x 5½ u-bolt (16) with lock washers
and hex nuts. On model 6542, bolt the 4” KFlex stub (17) to the wing frame using 1/2 x 5½
bolts (18) with lock washers and hex nuts.
(19), connecting link (20) and connecting link
bracket (21). Assemble with 1 x 3 hex bolts
(22) with 1” lock nuts, ½ x 3 x 5 u-bolts (23)
with lock washers and hex nuts.
On 5-section models, bolt the
3-Section models have rocker bracket
Figure 3
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Outside Wing Assembly
On 5-section models, assemble the
outside wing (1) by attaching the outside hinges
(2) to the wing with 1 x 6 hex bolt (3) and 5/8 x
3 x 5½ u-bolts (4) as shown in Figure 4. Use a
nylon lock nut on the 1 x 6 hex bolt (3) with
lock washers and hex nuts on the u-bolt.
Attach the 180 degree rocker (5), bulge side
out, with the 1 x 3 3/8 usable headed pin (6), 1”
machine washer and 3/16 x 2 cotter pin.
Attach the outside wheel bracket (7) just
as we did the inside ones, using the 1¼ x 6
pins (8) and 3/8 x 2¼ GR 8 hex bolts & lock
nuts. Slide the walking beam assembly (9) into
the wheel bracket sleeve as shown in Figure 4.
Again, it is recommended to use some form of
anti-seize product on the spindle. Secure with
5/16 x 3 clevis pin (10) and 1/8 x 1” cotter pin.
Note that the longer 14” long spindle assembly
(or 14 ½” with heavy hub option) goes to the
front. Bolt on the 9.5L x 15 tire and wheels
(11) with the ½ x 1¼ lug bolts (12) or ½” lug
nuts with the heavy hubs.
Models 6536 & 6542 use one tire and a
14 1/2” Hub & Spindle assembly (13) as shown
in insert.
Figure 4
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Connecting Outside Wing and Wing Brace Assembly
On 5-section models, bolt the outside
wing assembly (1) to the inside wing frame
with grade 8, 1 x 6 hex bolts, 1¾ thread (2)
Figure 5, securing with 1” nylon lock nuts.
Bolt the outside wing brace (3) to the
plate on the outside wing with ¾ x 2 hex bolts
(4), with lock washers and hex nuts.
Attach the 3 x 8 (3½ x 8 for 7548 &
7552) rephasing hydraulic cylinder (5) between
the lever on the wheel bracket and the 1 x 7½
eye bolt (6) mounted in the bracket in the back
of the wing. Use 1 x 3½ clevis pins (7) with 1”
machine washer and 3/16 x 2 cotter pins and 1”
jam nuts on the eye-bolt.
On model 6542, attach the 4x4 K-Flex
stub (8) as shown with ½ x 5½ hex bolts (9),
lock washers and hex nuts.
Figure 5
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Center Gang & Gang Hanger Assembly
At this time it is best to hang the center
gangs and gang hanger tubes before you install
the hitch and hitch strut assembly, Figure 6.
U-bolt the center right and left gang
hanger tubes (1) & (2) to the center brace bar
with 5/8 x 3 x 5½ u-bolts (3), with lock washers
and hex nuts. Line up the levers on the hanger
tubes with the ratchet jack/cylinder mounts on
the brace bar. Pin the preassembled center
gangs (4) & (5) to the gang hanger tubes (1) &
(2) with the 1 x 5½ pins (6). Secure with 3/8 x
2 clevis pins & 1/8 x 1 cotters. Slide the
spring washer (8) & spring (9) on to the gang
spring bolt (7) as shown and slide it up into the
cast swivel on the gang hanger tubes. Place a
1” flat washer on the spring bolt and thread the
1” hex nut and 1” jam nut onto the spring bolt
(7). Pin the other end to the gang with ¾ x 2½
clevis pins (10), secure with 1/8 x 1½ cotters.
Finally tighten down the nuts on the spring bolt
until the spring has a preload length of 8 3/4”.
Figure 6
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Center Truss, Hitch and Strut Assembly
Bolt the center frame truss (1) Figure 7,
to the top side of the center frame and brace
bar. Use 3/4 x 2 bolts (3) on the front plates
and 5/8 x 1½ bolts (2) on the rear two plates.
Use lock washers and hex nuts on all of these
bolts. On models 6536, 6542, 7333, 7336, 7548
& 7552, bolt the truss cross bar (4) with the
truss legs (5) through the truss frame (1) with
the ¾ x 6 bolt (6), lock washers and hex nuts.
Use two ¾ x 2 hex bolts (7) with lock washers
and hex nuts, at the base of the truss legs.
Slide the back of the hitch (8) between
the plates at the front of the brace bar as shown.
Use two 1¼ x 7 GR 8 bolts (9) and 1¼ lock
washers and hex nuts to secure the hitch.
Mount the tongue jack (10) to the front of the
hitch to support it.
Use 1 x 5½ bolts (12) to attach the hitch
strut (11) between the front of the truss and the
hitch. Use lock washers and hex nuts on these
bolts.
Slide the hose support (13) rod into the
tube at the front of the hitch and secure it with a
1/8 x 1½ cotter pin. Attach the rebound valve
mounting bracket (14) and valve mounting
bracket plate (15) with four ½ x 4½ bolts (16)
using lock washers and hex nuts.
Figure 7
Series VII 6326-7552 Discovator 550-221M 3/31/2004
8/11/2008
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Hitch Tongue, Side Plate and Level Bar Assembly
Slide the H-bracket (1) down over the
hitch pole as shown in Figure 8. Bolt in place
with a ¾ x 8 bolt (2) and ¾” lock nut. Draw
this nut up but do not torque
pivot.
Insert the level bars (3) and (4) through
the previously assembled truss and connect to
the torque tube using two 1 x 3 3/8 usable
clevis pins (5), 1” flat washers, one 1” machine
washer and 3/16 x 2 cotter pins. Install the 1 ¼
x 13½ GR 8 bolt (6) through the level bars and
H-bracket. Draw up snug with a 1¼ top lock
nut (do not torque).
Connect the level bar cross brace (7)
between the level bars and bolt in place with ¾
x 2 hex bolts (8) using hex nuts and lock
washers. Slide the side plate weldment (9) over
the end of the hitch and bolt in place as shown
, as this part must
with the 1½ x 12 safety chain hitch bolt (10).
Secure with 1½ slotted hex nut and ¼ x 3 cotter
pin. Use the 1½ machine washers as needed
for proper fit. Connect the turnbuckle (11)
between the side plate assembly and the Hbracket (1). Use a 1 x 3 3/8 usable clevis pin
(12) with machine washer and 3/16 x 2 cotter
pin at the back end of turnbuckle. Use a 1 x 9
GR 8 bolt (13) with a nylon lock nut at the tee
end of the turnbuckle. Snug, but do not torque
nylon lock nut.
Insert the hitch clevis (14) into the front
of the side plate weldment (9) and bolt in place
with a 1½ x 9 3/8 hitch bolt (15). Secure with
slotted hex nut, machine washers and ¼ x 3
cotter pin, using the 1½ machine washers again
as needed for proper fit.
Figure 8
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11/22/2004
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Center Lift Cylinder, Rest Pads and Hydraulic Valves Assembly
Connect the two 3½ x 8 (4 x 8 for 7548
& 7552) rephasing main lift cylinders (1) to
the center hitch pole as in Figure 9. Connect
the rod ends to the lugs on the H-bracket.
Place a 1” flat washer on each side of the lug
on the H-bracket to keep the hardened
bushings from coming out.
Secure the cylinders with 1 x 3½”
clevis pins (2), 1” machine washers and 3/16 x
2 cotter pins. Mount the rebound valve (3) as
shown with the V1 port to the front and top
using two 5/16 x 4 hex bolts (4) with lock
washers and hex nuts.
Install the depth stop mounting bracket
(5) to the center brace bar using two 5/8 x 3 x
5½, (Disc) or 5/8 x 4 x 5 ½ (Coulter) u-bolts
(6), lock washers and hex nuts. Bolt the depth
stop valve (7) on top of the bracket using the
5/16 x 2 hex bolts with lock washers. Insert
the depth stop tube (8) into the mounting
bracket (5) and attach to the level bar with ½
flat washer and 1/8 x 1 cotter pin. Bolt the
depth stop assembly (9) onto depth stop tube
(8) with two ½ x 2½ hex bolts (10) using ½”
lock washers and hex nuts.
U-bolt the 3 1/2” cylinder rest pads
(11) on the center bar as shown, using a ½ x 3
x 5 u-bolts (12) with lock washers and hex
nuts (see shank layout drawing for exact
placement). On double fold models, u-bolt the
3½” cylinder rest pads (11) on the back bar
using a ½ x 3 x 5 u-bolts (12) with lock
washers and hex nuts.
Figure 9
Series VII 6326-7552 Discovator 550-221M 3/31/2004
2/07/2005
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Fold Cylinders, Rocker Arm and 3” Rollers Assembly
Connect the center fold 4 x 24
cylinders (1) to the center fold bracket as
shown in Figure 10. Use the 1” x 3½ clevis
pin (2) with 1” machine washer and 3/16 x 2
cotter pin. Attach the rocker (3) to rocker
bracket with 1 x 3 Headed Pin (4) using 1”
machine washer and 3/16 x 2 cotter. Do Not
Connect Rod End Of Cylinders To Rockers
Before They Are Charged With Oil.
the cylinders, as shown, so they clear the
rockers in the extended position. You are now
ready to connect the hydraulic hoses to the
cylinders and charge the fold system (see
hydraulic layout).
Place a support block of wood under
Figure 10
On 5-section models, connect the base
of the 4 x 16 DB fold cylinders (7) to the
Rocker/Fold bracket with 1 x 3½ clevis pin
(2), 1” machine washer and cotter (see Figure
10). Do Not Connect Rod End Of Cylinders
To Rockers. Bolt the hose holders (5) to the
center frame with a ½ x 4½ hex bolt (6), using
a lock washer and hex nut.
Figure 11
Once the fold cylinders are fully
charged and free of air, connect them to the
rockers. Use a 1 x 5½ bolt (8) to bolt two 3”
rollers (9), one on each side, to the 180 degree
rocker as shown in Figure 11. Secure with 1”
nylon lock nut. Rollers must turn freely!
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Center Wing Stop and Outside Wing Stop Assembly
U-bolt the center wing stop (1) to the
second bar from the rear on the center frame as
shown in Figure 12. Use 1/2 x 3 x 5 u-bolts
(2) with lock washers and hex nuts. Center the
wing stop from side to side. Insert the ½ x 4½
transport lock quick pins (3) in the holders on
the wing stop.
On models 7548 & 7552, u-bolt the
front center wing stop (4) to the bottom of the
center frame truss using 5/8 x 3 x 4½ u-bolts
(5), lock washers and hex nuts. Bolt the wing
rest (6) to the rocker/fold bracket with 4-hole
clamp plate and ½ x 4½ hex bolts (7), lock
washers and hex nuts (See layout for
placement).
lock mount (8) on the inside wing with ½ x 3 x
5 u-bolts (9). U-bolt the wing lock “T”
bracket (10) on the outside wing with the same
½ x 3 x 5 u-bolt (9). Refer to the shank layout
for your particular model for the exact location
of the wing lock mount and lock “T” bracket.
Use lock washers and hex nuts on these ubolts. Bolt the wing latch (11) to the wing lock
mount (8) with a ¾ x 4½ bolt (12). Slide a ¾
flat washer (13) between the latch and the
mount on each side to take out the slop. Use a
¾” lock nut but do not torque
latch must move freely.
On 5-section models, u-bolt the wing
down. The
Figure 12
Series VII 6326-7552 Discovator 550-221M 3/31/2004
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Great Plains Mfg., Inc. Table of Contents ► Section 1: Assembly
Front Gauge Wheel Assembly
On model 6536 and 7336, bolt the
gauge wheel bracket (1) to the front plate of
wing brace as shown in Figure 13 using the 5/8
x 1½ hex bolts (2), lock washers and hex nuts.
Slide the gauge wheel arm/hub assembly (3)
up into the gauge wheel bracket (1) and pin
with the ¾ x 5¼ usable pin (4). Use four ½ x
1 hex bolts (5) to secure the arm and make it
rigid. Bolt on the 4-bolt rim and tire (6) with
four ½ x 1 lug bolts (7). For directions on the
proper setting for the gauge wheel during
operation, refer to section 5.
Figure 13
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Section 1: Assembly Table of Contents ► Great Plains Mfg., Inc.
Hydraulic Gauge Wheel Assembly
On model 6542, 7548 & 7552, bolt the
gauge wheel arm mount clevis (1) to the front
bar of wing brace as shown in Figure 14 using
the 5/8 x 1½ hex bolts (2), lock washers and
hex nuts. Insert the linkage arms (3) and (4)
and hydraulic gauge wheel arms (5) into the
arm clevis (1). Assemble with 1 x 6 hex bolt
(6) and nylon lock nut. Do not torque down.
Bolt the pivot bracket (7) to the arms as shown
with 1 x 7 hex bolt (8) and nylon lock nut,
again do not torque. Insert the appropriate left
or right gauge wheel arm (9) into the pivot
bracket (7) and install the friction cap (10),
spring (11), spring cover (12), ¾” hex nut (13)
and ¾” jam nut (14) to secure the assembly.
Insert the hub and spindle assembly (15) into
the gauge wheel arm (9), using anti-seize
material on the spindle. Secure with 5/16 x 3
clevis pin (16) and 1/8 x 1 cotter. Bolt on the
rim and tire assembly (17) with six ½ x 1¼
lug bolts (18). Install the gauge wheel
hydraulic cylinders (or ratchet jacks) as per
hydraulic layout for your machine, section 2.
Use 1 x 8½ eye-bolts with 1” jam nuts at the
base of the cylinders. For directions on the
proper setting for the hydraulic gauge wheel
during operation, refer to section 5.
Figure 14
Series VII 6326-7552 Discovator 550-221M 3/31/2004
11/22/2004
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