John Deere 8500 Disk Tiller Operator’s Manual Instant Download (Publication No.OMA32737)

1
8500
DISK TILLER
Y
C
D
OPERATORS MANUAL 8500 DISK TILLER OMA32737
F6 English
F 6
O M A 3 2 7 3 7
OMA32737 F6
LITHO IN THE U.S.A. ENGLISH
2
To the Purchaser
This new disk tiller was carefully designed and
manufactured to give years of dependable service.
To keep it operating efiiciently, read the
instructions in this operator's manual. Each
section is clearly identified so you can easily
find the information you needwhether it is
operation, lubrication, or maintenance. Read
Contents to learn where each section is
located. This safety alert symbol identifies
important safety messages in this manual. When
you see this symbol, be alert to the possibility
of personal injury and carefully read the message
that follows. Because John Deere sells its
products world-wide, U.S. units of measure are
shown with their respective Metric equivalents
throughout this operator's manual. These
equivalents are the SI (International System)
Units of Measure. In addition to the equipment
furnished with your disk tiller, attachments are
available to help you do a better job in special
conditions. These are described
in the attachments section of this manual and
can be purchased from your John Deere
dealer. Right-hand and left-hand sides are
determined by facing in the direction the disk
tiller will travel when in use. Record your disk
tiller serial number in the space provided on
page 20. Your dealer needs this informa- tion to
give you prompt, efficient service when you order
parts or attachments. If your disk tiller
requires replacement parts, go to your John Deere
dealer where you can obtain Genuine John Deere
partsac- cept no substitutes. The warranty on
this disk tiller appears on your copy of the
purchase order which you should have received
from your dealer when you purchased the disk
tiller.
REAR F1RR0W
HYDRAULl L OI L L ITES
FRONT FURROW KNEEL
DRAC B AR
John Deere 8500 20-Foot 6 og6
) Disk TJIIer
3
Contents
2 Safety Suggestions
3-4 Preparing for Use
5-6 Attaching and Detaching
7-8 Transporting
9-13 Operating Adjustments
14Ü5 Attachments
Æ6 Lubrication
17-18 Service
19-20 Specifications
2J Index
4
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Safety Suggestions
GENERAL

• Always lower the disk tiller when not in use.
  Shut off tractor engine and move the selective
  control lever back and forth to relieve pressure
  in cylinder and hoses.
• If spray can paint is used for protecting disks
  to be put in storage, be careful when discarding
  empty can. Do not incinerate or puncture can.
• TRANSPORTING
• While transporting the disk tiller on a public
  road, follow safety suggestions outlined under
  Transport- ing, pages 7 and 8.
• Be sure to lock drawbar in a fixed position when
  transporting the tiller.
• This disk tiller should be transported at a
  maximum speed of 20 mph (30 km/h). Do not exceed.
• Use care when transporting across rough ground.
• HYDRAULIC OIL
• Escaping hydraulic oil under pressure can have
  sufficient force to penetrate the skin, causing
  serious personal injury. Before disconnecting
  lines, be sure to relieve all pressure. Before
  applying pressure to the system, be sure all
  connections are tight and that lines, pipes and
  hoses are not damaged. Hydraulic oil escaping
  from a very small hole can be almost invisi- ble.
  Use a piece of cardboard or wood, rather than
  hands, to search for suspected leaks.
• If injured by escaping hydraulic oil, see a
  doctor at once. Serious infection or reaction can
  develop if proper medical treatment is not
  administered immedi- ately.
• Always relieve pressure in the hydraulic system
  before working with hydraulic system components.

2
The safety of the operator was one of the prime
considerations in the minds of John Deere
engineers when this disk tiller was designed.
You can make your farm a safer place to live and
work if you observe the safety suggestions given.
Study these suggestions carefully and insist that
they be followed by those working with you and
for you. OPERATION To avoid injury, always be
careful while operating a tractor and disk
tiller. Never permit any person other than the
operator on the tractor. Never ride or permit
others to ride on the disk tiller. Do not
grease, oil, or adjust the disk tiller while it
is in motion. When the disk tiIer is in a
raised position, be sure remote cylinder
operating levers are not bumped or touched by
anyone.
6
Preparing For Use
Tire Inflation Check tires on tiller to be sure
they are inflated to 32 psi (2.2 bar) air
pressure.

• IMPORTANCE OF PROPER ADJUSTMENT
• Your new tiller, when properly adjusted, will do
  ex- cellent work on all types of tillage
  jobspreparing seedbeds, mulching stubble, and
  working summer- fallow.
• While adjustments on this tiller are simple, read
  all instructions carefully so you will be able to
  make ad- justments properly. A properly adjusted
  tiller pulls lighter and results in lower
  maintenance cost.
• PREPARING THE TILLER
• Disks
• The surfaces of the tiller disks have been
  painted with protective black paint.
• In most cases, it is not necessary to remove the
  black paint because it will wear off quickly upon
  contact with the soil. In soils where the black
  paint will not wear off, remove with diesel fuel.
• If the tiller is not to be used immediately,
  protect the surface of the disks by applying a
  light coat of gun grease. If tiller is to be put
  in storage for a considerable length of time,
  remove dirt and trash and apply a good rust
  preventative. See page 17.
• Bolts, Set Screws, And Cotter Pins
• Before starting to work with a new tiller or one
  which has been stored, check to see that all
  nuts, bolts, and set screws are tight and all
  cotter pins spread to keep them from falling cut.
  Check to see that the gang shaft nuts are drawn
  up tight. See page 18.
• A good practice is to check for loose nuts,
  bolts, screws, or parts when lubricating the
  tiller. Loose bolts are easily lost and cause
  excessive wear on parts, resulting in possible
  serious damage to the tiller.

Lubrication Be sure tiller has been properly
lubricated. See lubrication chart on page 16.
3-4
PREPARING THE TRACTOR For complete tractor
operating instructions, refer to your tractor
operator's manual. Rockshaft Selector
Lever Before attaching tiller to the tractor, set
the rockshaft selector lever in the D, zero,
or min position. Keep the selector lever in
this position while operating. Tractor
Drawbar Set the drawbar in the long high
position. When operating tiller, the tractor
drawbar should be free to swing. When
transporting, pin the drawbar to the center of
the support. CAUTION Be sure to lock the
tractor drawbar in a fixed position when
trans- porting the tiller.
7
4 Preparing For Use
PREPARING THE TRACTORContinued Rear Wheel
Weighting
Rear Wheel Setting
Set tractor wheels so the swinging drawbar runs
as close to center ot tractor as possible.
In average conditions, tractor rear wheel weights
are not necessary. In those conditions where it
becomes necessary to add weight to the rear
wheels, see your tractor operator's manual for
weighting instructions.
Operate wheel-type tractors with the right-hand
wheels in the furrow or with all wheels on the
land, and crazier-type tractors with both tracks
on the land.
Power can be lost and tire life cut drastically
by wheel slippage. Adding weight also serves to
stabilize the tractor when working in rough or
hillside fields.
During normal operation, all turns should be made
to the left. When turning to the right, be
careful so the front wheel of tiller does not run
into rear wheel of tractor.
3 4
The ideal amount of added weight can be deter-
mined by observing the tracks of the rear wheels.
When the tractor is pulling its rated load, the
soil between the tire lugs should be broken or
shifted. If too much weight has been added, the
tread marks will be clear and distinct. If too
little weight has been added, the tread marks
will be entirely obliterated.
Front Wheel Setting To get proper field
maneuverability, set the front wheels to conform
to rear-wheel setting, center-to- center of tread.
Tire Inflation Inflate the tractor tires as
recommended in the trac- tor operator's manual.
When operating tiller with the right-hand tractor
tires in the furrow, add 4 psi (0.3 bar) more air
in right rear tire than in left rear tire.
8
Attaching and Detaching
5
Attaching Hydraulic Cylinders and Hoses Before
attaching hoses to tractor, relieve pressure in
the tractor hydraulic system. To relieve
pressure, stop tractor engine and move remote
cylinder operating levers back and forth several
times.
ATTACHING TILLER TO TRACTOR
IMPORTANT Wipe hose ends to remove any dirt
before inserting in the breakaway couplers.
Install hoses in breakaway couplers so that
cylinder will extend or retract as indicated by
symbols on tractor console. Move the operating
lever back and forth a few times to pressurize
the cylinder.
5-6
NOTE. If the hoses have been disconnected from
the hydraulic cylinder or if the cylinder has not
been used before, all trapped air must be removed
from the cylinder. To remove trapped air, remove
cylinder attaching pins and lay the cylinder
across the disk tiller frame with the oil outlets
up to allow the trapped air to escape. Start the
engine and operate the remote cylinder operating
lever back and forth seven or eight times,
allowing the full stroke each time. Attach the
front hydraulic cylinder to the disk tiller
as fOIlOWS With transport pin in transport
position (A), install the front cylinder on the
tiller as shown below. Extend the cylinder and
move transport pin to operating position (C).
ADrawbar BDrawbar Connecting Loop
W8teering Bar DHitch Brece
The 8500 Disk Tiller requires a clevis type
tractor drawbar. Back tractor up to tiller. Lift
hitch to tractor drawbar and secure with pin
supplied with tractor clevis. Hose Length To
provide ample hose, the length of the remote
cylinder hoses may have io be increased. The
minimum hose length from the tractor drawbar
hitch point to the hose end of the cylinder or
oil line connectors is 152 inches (3 860 mm). To
determine if additional hose is required, attach
the remote cylinder hoses to the tractor
breakaway couplers. Lay the cylinder on the
ground directly be- hind the drawbar with hoses
stretched out full length. Pull hoses down to the
tractor drawbar. Measure the distance from the
end of the drawbar to the hose end of the
cylinder. If this distance is less than 152
inches (3 860 mm), additional hose is required.
See your John Deere dealer.
ATransport Pin in Transport Position BAttaching
Pins COperating Position for Transport Pin
9
6 Attaching and Detaching
Checking Hydraulic System After attaching the
tiller to tractor for the first time, check all
hydraulic connections and hoses for leaks.
Attaching Hydraulic Cylinders and
HosesContinued
CAUTION Escaping hydraulic oil under pressure
can have sufficient force to pen- etrate the
skin, causing serious personal injury. Before
disconnecting hoses, be sure to relieve all
pressure. Before applying pressure to the system,
be sure all connections are tight and that hoses
are not damaged.
Hydraulic oil escaping from a very small hole can
be almost invisible. Use a piece of cardboard or
wood, rather than hands, to search for suspect-
ed leaks.
5-6
If injured by escaping hydraulic oil, see a
doctor at once. Serious infection or reaction can
develop if proper medical treatment is not
administered immediately.
ATransp'ort Pin in Transport Position
BAttaching Holes COperating Position for
Transport Pin
DETACHING TILLER FROM TRACTOR
CAUTION Before removing hydraulic
Attach rear hydraulic cylinder to disk tiller as
follows
hoses from tractor, be sure to relieve the
hydraulic pressure. To do this, shut off the
tractor
With transport pin in transport position (A),
install the rear cylinder on the tiller as shown
above. Extend the cylinder and move transport
pin to operating position (C).
and move the remote cylinder operating lever back
and forth several times.
1. If in field working position, be sure tiller
is lowered to the ground. Disconnect hoses and
drawbar.
Place hoses through hose support.
2. If in field transport position, move transport
pins to transport position. Disconnect hoses and
drawbar.
3. If in road transport position, be sure
transport pins are in transport position.
Disconnect hoses and drawbar.
10
Transporting
7
7-8
ATransport Pin in Transport Position BRemote
Hydraulic Cylinder CTransport Brackets Hitch in
Transport Position
DTransport Position EFront Furrow Axle Lug
FSteering Bar
CAUTION Be sure to lock the tractor drawbar
in a fixed position before trans- porting the
tiller.
Remove hitch brace and turn hitch brace back
along drawbar, and lay on drawbar transport
bracket. Then swing front end of drawbar in and
lay on main frame transport bracket as shown
above.
To transport the tiller, the front furrow wheel
must be straightened vertically, the front and
rear furrow wheels turned for transport lead, and
the hitch members changed. HITCH Remove Quik-Lock
pins from studs on drawbars.
NOTE if tandem hitch is used, before holding it
for transport, lengthen chain one link. See
Tandem Hiich on page 14.
FRONT FURROW WHEEL Retract the front furrow axle
remote hydraulic cylin- der raising the front
furrow wheel until it clears the ground. Then
straighten wheel by changing bolt to lower hole
in axle bracket as indicated in illustration
above.
Lift steering bar off the drawbar stud and pivot
the bar over the front furrow axle lug as shown
in above illustration.
11
8
HYDRAULIC CYLINDER Raise the disks to the highest
position by using the tractor remote cylinder
operating levers. Insert pins in transport
position in both the front furrow axle bails and
the rear frame bails. Hydraulic cylinders can
then be removed from tiller, if
desired. IMPORTANT It is not necessary to remove
cyl- inders when transporting. However, always
place pin in transport position to take the load
off the hydraulic system. Disconnect hydraulic
hoses from tractor breakaway couplers. Loop hoses
back through hose supports as shown in
illustration at top of page 7.
TRANSPORTINGContinued REAR FURROW WHEEL AND
STEERING ROD
TRANSPORT PINS Transport pins are provided for
both the front furrow axle and the rear
frame. When operating in the field, make sure
pins are in operating position. See pages 5 and
6. When transporting, raise the tiller to highest
position by use of the remote cylinders and
insert pins in transport position. IMPORTANT Do
not operate cylinders with pins in transport
position.
Remove Quik-Lock pin from steering pipe and lift
steering pipe from front hole in rear axle angle.
Insert steering pipe in rear hole in rear axle
angle. Secure with Quik-Lock pin.
TRANSPORT SPEED CAUTION This disk tiller has
been de signed to be transported at a
maximum speed of 20 mph (30 km/h). DO NOT
EXCEED. Never travel at any speed which does not
permit adequate control of steering and
stopping. CAUTION When transporting the tiller
on a road or highway at night or during the day,
use accessory lights and devices for adequate
warning to the operators of other vehicles. In
this regard, check local governmental regulations
for proper use. Various safety lights and devices
are available from your John Deere dealer. NOTE
Use of a salety chain is recommended when towing
this implement on public roads. Tensile strength
of the safely chain should be at least equal to
the gross weight of the towed load. A safety
chain is available through your John Deera dealer.
If additional adjustment of the steering pipe is
nec- essary for transporting, adjust by
shortening or length- ening the steering pipe. A
slignt lead to the right gives best results when
transporting.
Place the tiller keel in transport position. Move
lever to the front for transporting.
12
C.i,i.rii,.ai
9
Operating Adjustments
FRONT FURROW WHEEL
REAR FURROW WHEEL
9-13
The rear furrow wheel is also adjustable for
working and transporting positions. The two holes
in the rear axle angle, and the threaded steering
pipe provide for these adjustments.
Cheering Plete
For working position, pin the steering pipe in
the front hole in the rear axle angle.
NOTE The initial setting for the front furrow
wheel
is l2-inches (305 mm) from ihe bottom of the
low'er
clamp collar to the steering plaie. Final
adjustments
The rear steering pipe is adjustable so the lead
in the rear wheel may be set for various ground
condi- tions. When in working position, the rear
furrow wheel should run parallel to the line of
travel or with a slight lead to the right of the
line of travel.
should be made in ihe (ield.
Two holes in the front furrow wheel axle support
provide adjustment for working and transporting
posi- tions. Tilt wheel and place bolt in top
hole for working position. Straighten wheel and
place bolt in lower hole for transporting
position. When in working position the front
furrow wheel should run with a slight lead to the
right of line of travel. Lead is controlled by
the front steering bar. See page 11. NOTE. To
make the first round of the lield, shorten the
hydraulic cylinder to permit the from of ihe
tiller to till the soil while the rear is
establishing the furrow. Final field adjustments
of the front wheel must be done with the wheel in
the furrow.
To adjust, remove Quik-Lock pin and lift steering
pipe from rear axle angle. Shorten or lengthen
the steering pipe as needed and replace steering
pipe in rear axle angle secure with Quik-Lock
pin.
13
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10 Operating Adjustments
TILLER KEEL
LAND WHEEL
The tiller keel assists in maintaining Straight
trailing of the tiller in all working
conditions. The tiller keel should run 1-1/2 to
2 inches (38 to 50 mm) deep. Add the minimum
amount of weights nec- essary to acnieve this
condition.
The land wheel is adjustable vertically to
compen- sate for various working depths of the
tiller, Collars on the axle permit adjustment up
or down. AdiSt the land wheel to make the rear
frame level when operating.
Working depth may be adjusted by turnin assembly.
g the yoke
To adjust yoke, remove drilled pin, raise
adjusting pipe, and turn yoke until desired
setting is obtained. Lower pipe back into
position and replace pin. When the Never is
placed to the front, the tiller keel is in
transport position. When the lever is moved rear-
ward, the tiller keel is placed in operating
position.
15
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the link into your browser. The full manual is
available for immediate download. https//www.ebo
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