Page 1
®
BUSH HOG
Models RTN, RTNR, & RTH
Rotary Tillers
OOppeerraattoorr’’ss MMaannuuaall
ASSEMBLY
207 $4.00
ll
OPERATION
ll
MAINTENANCE
93777
Page 2
CONGRATULATIONS!
You have invested in the best implement of its type on the market today.
The care you give your Bush Hog implement will greatly determine your satisfaction
with its performance and its service life. We urge a careful study of this manual to provide
you with a thorough understanding of your new implement before operating, as well as
suggestions for operation and maintenance.
If your manual should become lost or destroyed, Bush Hog will be glad to provide you with
a new copy. Order from Bush Hog, P. O. Box 1039, Selma, Alabama 36702-1039. Most of
our manuals can also be downloaded from our website at www.bushhog.com.
As an authorized Bush Hog dealer, we stock genuine Bush Hog parts which are
manufactured with the same precision and skill as our original equipment. Our trained
service personnel are well informed on methods required to service Bush Hog equipment,
and are ready and able to help you.
Should you require additional information or assistance, please contact us.
YOUR AUTHORIZED
BUSH HOG DEALER
BECAUSE BUSH HOG MAINTAINS AN ONGOING
PROGRAM OF PRODUCT IMPROVEMENT, WE
RESERVE THE RIGHT TO MAKE IMPROVEMENTS IN
DESIGN OR CHANGES IN SPECIFICATIONS WITHOUT INCURRING ANY OBLIGATION TO INSTALL
THEM ON UNITS PREVIOUSLY SOLD.
BECAUSE OF THE POSSIBILITY THAT SOME
PHOTOGRAPHS IN THIS MANUAL WERE TAKEN OF
PROTOTYPE MODELS, PRODUCTION MODELS MAY
VARY IN SOME DETAIL. IN ADDITION, SOME
PHOTOGRAPHS MAY SHOW SHIELDS REMOVED
FOR PURPOSES OF CLARITY. NEVER OPERATE
THIS IMPLEMENT WITHOUT ALL SHIELDS IN PLACE.
Page 3
Rotary Tillers Operator’s Manual
Models RTN, RTNR & RTH
TABLE OF CONTENTS
SECTION / PARA PAGE
Warranty . . . . . . . . . . . . . . . . . . . . . . . .2
Dealer Preparation Check List . . . . . . .3
Safety Precautions . . . . . . . . . . . . . . . .4
Federal Laws And Regulations . . . . . .5
I INTRODUCTION & DESCRIPTION . . .6
1-1 Introduction . . . . . . . . . . . . . . . . . .6
1-2 Description . . . . . . . . . . . . . . . . . . .6
II PREPARATION FOR USE . . . . . . . . .7
2-1 Attaching To Tractor . . . . . . . . . . .7
2-2 Offsetting Hitch Pins (RTN,RTNR) .8
III OPERATING INSTRUCTIONS . . . . . .9
3-1 General Safety . . . . . . . . . . . . . . . .9
3-2 Adjusting For Work . . . . . . . . . . . .9
RETAIL CUSTOMER’S RESPONSIBILITY
SECTION / PARA PAGE
3-3 Operation . . . . . . . . . . . . . . . . . . . .9
3-4 Transporting . . . . . . . . . . . . . . . . . .9
IV MAINTENANCE . . . . . . . . . . . . . . . . .10
4-1 Maintenance Check List . . . . . . . .10
4-2 Lubrication . . . . . . . . . . . . . . . . . .10
4-3 Blade Replacement . . . . . . . . . . .11
4-4 Slip Clutch Operational Check . . .11
4-5 Slio Clutch Adjustment . . . . . . . . .11
4-6 RTN, RTNR Chain Adjustment . . .11
4-7 Troubleshooting . . . . . . . . . . . . . .12
V DEALER ASSEMBLY . . . . . . . . . . . . .13
Safety Decals . . . . . . . . . . . . . . . . . . .15
Torque Specifications . . . . . . . . . . . . .16
UNDER THE BUSH HOG WARRANTY
It is the Retail Customer and/or Operator’s responsibility to read the Operator’s Manual, to
operate, lubricate, maintain and store the product in accordance with all instructions and
safety procedures. Failure of the operator to read the Operator’s Manual is a misuse of this
equipment.
It is the Retail Customer and/or Operator’s responsibility to inspect the product and to have
any part(s) repaired or replaced when continued operation would cause damage or excessive wear to other parts or cause a safety hazard.
It is the Retail Customer’s responsibility to deliver the product to the authorized Bush Hog
Dealer, from whom he purchased it, for service or replacement of defective parts which are
covered by warranty. Repairs to be submitted for warranty consideration must be made within forty-five (45) days of failure.
It is the Retail Customer’s responsibility for any cost incurred by the Dealer for traveling to or
hauling of the product for the purpose of performing a warranty obligation or inspection.
1
Page 4
LIMITED WARRANTY
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
authorized Bush Hog dealer, that the equipment be free from defects in material and workmanship for a period
of one (1) year for non-commercial, state, and municipalities’ use and ninety (90) days for commercial use from
date of retail sale. The obligation of Bush Hog to the purchaser under this warranty is limited to the repair or
replacement of defective parts.
Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an
for ninety (90) days from the date of purchase of such part or to the expiration of the applicable new equipment warranty period, whichever occurs later. Warranted parts shall be provided at no cost to the user at an
authorized Bush Hog dealer during regular working hours. Bush Hog reserves the right to inspect any equipment or parts which are claimed to have been defective in material or workmanship.
Replacement or repair parts installed in the equipment covered by this limited warranty are warranted
DISCLAIMER OF IMPLIED WARRANTIES & CONSEQUENTIAL DAMAGES
Bush Hog’s obligation under this limited warranty, to the extent allowed by law, is in lieu of all war-
ranties, implied or expressed, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE and any liability for incidental and consequential damages with respect to
the sale or use of the items warranted. Such incidental and consequential damages shall include but not be
limited to: transportation charges other than normal freight charges; cost of installation other than cost
approved by Bush Hog; duty; taxes; charges for normal service or adjustment; loss of crops or any other loss of
income; rental of substitute equipment, expenses due to loss, damage, detention or delay in the delivery of
equipment or parts resulting from acts beyond the control of Bush Hog.
THIS LIMITED WARRANTY SHALL NOT APPLY:
1. To vendor items which carry their own warranties, such as engines, tires, and tubes.
2. If the unit has been subjected to misapplication, abuse, misuse, negligence, fire or other accident.
3. If parts not made or supplied by Bush Hog have been used in connection with the unit, if, in the sole judgement of Bush Hog such use affects its performance, stability or reliability.
4. If the unit has been altered or repaired outside of an authorized Bush Hog dealership in a manner
which, in the sole judgement of Bush Hog, affects its performance, stability or reliability.
5. To normal maintenance service and normal replacement items such as gearbox lubricant, hydraulic fluid,
worn blades, or to normal deterioration of such things as belts and exterior finish due to use or
exposure.
6. To expendable or wear items such as teeth, chains, sprockets, belts, springs and any other items that in the
company’s sole judgement is a wear item.
ITED WARRANTY IN ANY WAY OR GRANT ANY OTHER WARRANTY UNLESS SUCH CHANGE IS MADE
IN WRITING AND SIGNED BY BUSH HOG’S SERVICE MANAGER, POST OFFICE BOX 1039, SELMA,
ALABAMA 36702-1039.
NO EMPLOYEE OR REPRESENTATIVE OF BUSH HOG IS AUTHORIZED TO CHANGE THIS LIM-
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
Record the model number, serial number and date
purchased. This information will be helpful to your
dealer if parts or service are required.
MAKE CERTAIN THE WARRANTY REGISTRATION
CARD HAS BEEN FILED WITH BUSH HOG/
SELMA, ALABAMA
MODEL NUMBER
SERIAL NUMBER
DATE OF RETAIL SALE
2
Page 5
DEALER PREPARATION CHECK LIST
ROTARY TILLERS
BEFORE DELIVERING MACHINE — The following check list should be completed.
Use the Operator’s Manual as a guide.
r 1. Assembly completed.
r 2. Gearboxes filled with oil.
r 3. All fittings lubricated.
r 4. All shields in place and in good condition.
r 5. All fasteners torqued to specifications given in Torque Chart.
r 6. Slip clutch checked for proper operation.
r 7. All decals in place and readable. (See decal page.)
r 8. Overall condition good (i.e. paint, welds)
r 9. Operators manual has been delivered to owner and he has been instructed
on the safe and proper use of the cutter.
Dealer’s Signature
Purchaser’s Signature
THIS CHECKLIST TO REMAIN IN OWNER’S MANUAL
It is the responsibility of the dealer to complete the procedures listed
above before delivery of this implement to the customer.
3
Page 6
IMPORTANT SAFETY PRECAUTIONS
This symbol is used to call attention to safety precautions that should be followed by
the operator to avoid accidents. When you
see this symbol, carefully read the message
that follows and heed its advice. Failure to
comply with safety precautions could result
in serious bodily injury.
In addition to the design and configuration of equipment, hazard control and accident prevention are
dependent upon the awareness, concern, prudence and proper training of personnel in the operation,
transport, maintenance and storage of equipment. Lack of attention to safety can result in accident, per
sonal injury, reduction of efficiency and worst of all—loss of life. Watch for safety hazards and correct defi
ciencies promptly. Use the following safety precautions as a general guide to safe operations when using
this machine. Additional safety precautions are used throughout this manual for specific operating and
maintenance procedures. Read this manual and review the safety precautions often until you know the limitations.
1. Read the Operator’s Manual. Failure to read the Operator’s Manual is considered a misuse of this
equipment.
2. Become familiar with all the machine’s controls and all the caution, warning and danger decals
affixed to the machine before attempting to start or operate.
3. Before starting or operating the machine, make a walk around inspection and check for obvious
defects such as loose mounting bolts and damaged components. Correct any deficiency before
starting.
4. Do not allow children to operate the implement. Do not allow adults to operate it without proper
instruction.
5. Do not carry passengers.
6. Keep the area of operation clear of all persons, particularly small children and pets. The operator
should cease operation whenever anyone comes within the area.
7. Lower implement to ground, stop tractor engine and apply parking brake before leaving the tractor.
8. Keep hands and feet away from implement.
9. Wear personal protective equipment such as, but not limited to, protection for eyes, ears, feet,
hands and head when operating or repairing the equipment. Do not wear loose clothing or jewelry
that may catch on equipment moving parts.
10. When performing adjustments or maintenance on the implement, first lower it to the ground or block
it securely at a workable height.
11. Never stand between tractor and implement while tractor is being backed to the hitch.
12. Reduce speed when transporting implement to avoid bouncing and momentary loss of steering.
13. Use tractor flashing warning lights, day or night, when transporting implement on road or highways
unless prohibited by law.
14. It is recommended that tractor be equipped with Rollover Protective System (ROPS) and seat belt
be used in all implement operations.
4
Page 7
IMPORTANT FEDERAL LAWS AND REGULATIONS* CONCERNING
EMPLOYERS, EMPLOYEES AND OPERATIONS.
*(This section is intended to explain in broad terms the concept and effect of the following federal laws and
regulations. It is not intended as a legal interpretation of the laws and should not be considered as such).
U.S. Public Law 91-596 (The Williams-Steiger Occupational and Health Act of 1970) OSHA
This Act Seeks:
“...to assure so far as possible every working man and woman in the nation safe and healthful working
conditions and to preserve our human resources...”
DUTIES
Sec. 5 (a) Each employer—
(1) shall furnish to each of his employees employment and a place of employment
which are free from recognized hazards that are causing or are likely to cause
death or serious physical harm to his employees;
(2) shall comply with occupational safety and health standards promulgated under
this Act.
(b) Each employee shall comply with occupational safety and health standards
and all rules, regulations and orders issued pursuant to this Act which are
applicable to his own actions and conduct.
OSHA Regulations
Current OSHA regulations state in part: “At the time of initial assignment and at least annually thereafter, the
employer shall instruct every employee in the safe operation and servicing of all equipment with which the
employee is, or will be involved.” These will include (but are not limited to) instructions to:
Keep all guards in place when the machine is in operation;
Permit no riders on equipment;
Stop engine, disconnect the power source, and wait for all machine movement to stop before
servicing, adjusting, cleaning or unclogging the equipment, except where the machine must be
running to be properly serviced or maintained, in which case the employer shall instruct employees
as to all steps and procedures which are necessary to safely service or maintain the equipment.
Make sure everyone is clear of machinery before starting the engine, engaging power, or operating
the machine.
EMPLOYEE TRACTOR OPERATING INSTRUCTIONS:
1. Securely fasten your seat belt if the tractor has a
ROPS.
2. Where possible, avoid operating the tractor near
ditches, embankments, and holes.
3. Reduce speed when turning, crossing slopes, and
on rough, slick, or muddy surfaces.
4. Stay off slopes too steep for safe operation.
5. Watch where you are going, especially at row
ends, on roads, and around trees.
6. Do not permit others to ride.
7. Operate the tractor smoothly - no jerky turns,
starts, or stops.
8. Hitch only to the drawbar and hitch points recom-
mended by tractor manufacturers.
9. When tractor is stopped, set brakes securely and
use park lock if available.
Child Labor Under 16 Years Old
Some regulations specify that no one under the age of 16 may operate power machinery. It is your
responsibility to know what these regulations are in your own area or situation. (Refer to U.S. Dept. of
Labor, Employment Standard Administration, Wage & Home Division, Child Labor Bulletin #102.)
5
Page 8
SECTION l
INTRODUCTION AND DESCRIPTION
1-1 INTRODUCTION
We are pleased to have you as a Bush Hog customer.
Your Bush Hog Rotary Tiller has been carefully
designed to give maximum service with minimum
down time. This manual is provided to give you the
necessary operating and maintenance instructions
for keeping your rotary tiller in top operating conditio n. P lea se r ead this man ual tho rou ghl y.
Understand what each control is for and how to use
it. Observe all safety precautions decaled on the
machine and noted throughout the manual for safe
operation of the implement. If any assistance or additional information is needed, contact your authorized
Bush Hog dealer.
NOTE
All references made in this manual to right, left, front,
rear, top and bottom is as viewed facing the direction
of forward travel with implement properly attached to
tractor.
Figure 1-1 Major Components
(Model RTN 60 Shown)
A-Frame
Adjustable, Spring Loaded
Shock Absorber
For Rear Deflector
1-2 DESCRIPTION
The RTN, RTNR medium duty series of rotary tillers
is designed for use in a wide range of tilling requirements. The RTH heavy duty series of rotary tillers is
designed for tougher operating conditions. Each of
the tillers has adjustable skid shoes for setting
desired tilth of the soil. Center gearboxes tranfer
power from the tractor PTO to the end drive system.
The RTN, RTNR series uses a heavy duty chain
drive to the rotor shaft whereas the RTH series uses
a gear train type of end drive system. Slip clutches
protect the tillers from overload damage.
NOTE: The RTNR series of rotary tillers utilizes a
reverse rotation design which turns the rotor/blade
assembly in the opposite direction of forward travel.
Chain Drive Cover
Input Gearbox
(Behind Slip Clutch)
Rear
Deflector
Adjustable Skid Shoe
Parking Stand
Adjustable Lower
Hitch Pin
Rotor/Blade Assembly
Driveline With Slip Clutch
6
Page 9
SPECIFICATIONS
RTNR60 RTNR72 RTNR80
Model No. RTN60 RTN72 RTN80 RTH60 RTH72 RTH80 RTH88
Tillage Width 60” 72” 80’ 60” 72” 80” 88”
Number of Blades 28 36 40 28 36 40 44
Type Blades C-Type C-Type C-Type C-Type C-Type C-Type C-Type
Weight 664 lbs. 726 lbs. 777 lbs. 810 lbs. 884 lbs. 924 lbs. 964 lbs.
No. of Flanges 7910 7910 11
Rotor Speed 238 RPM @ 540 RPM 213 RPM @ 540 RPM
Depth of Cut 7” Adjustable with 5-Position Skid 7” Adjustable
Power to Rotor Chain Drive (#100) Single Speed Gear Drive
SECTION II
PREPARATION FOR USE
2-1 ATTACHING TO TRACTOR
WARNING
TO AVOID SERIOUS INJURY OR DEATH:
NEVER S TAND BE TWEEN T RACTOR
AND TILLER WHILE TRACTOR IS BEING
BACKED TO HITCH.
approximately 3 inches (76mm) short of reaching
universal joint shield on opposite section. If too long,
measure 3 inches back from universal joint shield
and mark on opposite section. (Figure 2-1). Do this
for both sections.
Figure 2-1
WARNING
TO AVOID SERIOUS INJURY OR DEATH:
ADDITIONA L TRACTOR FRON T BALLAST MAY BE NEEDED FOR STABLE
OPERATION AND TRANSPORT OF THE
TILLER. SEE TRACTOR OPERATOR’S
MANUAL FOR RECOMMENDED WEIGHTS.
NOTE
The RTN series tiller may be offset to either side if
so desired. Instructions for offsetting are given in
paragraph 2-3.
A. Attach tiller to tractor 3-point hitch per tractor
operator’s manual. Do not attach driveline at this
time.
NOTE
Due to the many variations in tractor/implement hitch
points and corresponding differences in distances
between tractor PTO shafts and implement input
shafts, drivelines may need to be shortened as
described in the following steps:
B. Raise and lower tiller to determine position
with shortest distance between the tractor PTO shaft
and gearbox input shaft. Shut down tractor, leaving
tiller in position of shortest distance. Securely block
tiller in position.
C. Pull driveline apart. Attach outer (female) section to tractor PTO shaft. Pull on driveline section to
be sure that yoke locks into place.
D. Hold driveline sections parallel to each other
to determine if it is too long. Each section should end
E. Raise and lower tiller to determine position
with greatest distance between PTO shaft and gearbox input shaft. Shut down tractor leaving tiller in
position of greatest distance. Securely block tiller
in position.
F. Hold driveline sections parallel to each other
and check for minimum 6 inches (15cm) overlap.
(Figure 2-2) If driveline has been marked for cutting,
overlap will be the distance between two marks. If
driveline has less than minimum overlap, do not use.
Contact authorized Bush Hog dealer.
Figure 2-2
Minimum Overlap
7
Page 10
NOTE
If driveline is the correct length, omit the following
steps “G” through “J” and proceed to step “K”.
G. Clamp driveline in a well padded vice to prevent damage to the shield. Cut off shield where
marked. (Figure 2-3)
Figure 2-3
H. Using cut off section of shield as a guide, cut
shaft the same amount. (Figure 2-4)
Figure 2-4
Figure 2-5
L. Adjust lower lift arm to level tiller right to left.
Refer to tractor operator’s manual for instructions.
M. Adjust top link of tractor 3-point hitch to level
tiller front to rear.
N. Set up tractor stabilizer bars, sway blocks, or
equivalent to prevent implement side sway. (Figure 2-6)
Figure 2-6
Stabilizer Bars
I. Repeat steps “G” and “H” to other driveline
section.
J. Deburr ends of driveline sections and clean
away all chips and fillings. (Figure 2-5)
K. Apply multi-purpose grease to inside of outer
(female) driveline section. Assemble driveline and
install on tractor and tiller. Pull on each driveline section to be sure yokes lock into place. Make certaqin
driveline shielding is in place and in good condition.
Stabilizer
Lift Arms
Stabilizer
2-2 OFFSETTING 3-POINT HITCH
(RTN Series)
The lower hitch pins on the RTN series can be offset
up to 6 inches to either side as follows:
A. Loosen clamp bolts on hitch pin that will move
outward and slide to desired position.
B. Remove opposite hitch pin bracket and replace it
between clutch shield and “A” frame. A distance of 267/8” , measured as shown in Figure 2-7, must be maintained between pins.
C. Tighten clamp bolts.
Figure 2-7 Lower Hitch Pins - May Be Relocated
DANGER
MAK E CERTAIN DRIVELINE YOKES AR E
SECURELY FASTENED. FAILURE TO DO SO
MAY RESULT IN SERIOUS INJURY.
26-7/8”
8
Page 11
SECTION III
OPERATING INSTRUCTIONS
3-1 GENERAL SAFETY
Only qualified people familiar with this operator’s
manual should operate this machine. Operator should
wear hard hat, safety glasses, and safety shoes. It is
recommended that tractor be equipped with Rollover
Protective System (ROPS) and a seat belt be used.
Before beginning operation, clear wo rk ar ea of
objects that may be picked up and thrown or wrapped
in tiller blades. Check for ditches, stumps, holes, or
other obstacles that could upset tractor or damage
tiller. Always turn off tractor engine, set parking brake,
and allow rotor to come to a complete stop before dismounting tractor.
3-2 ADJUSTING FOR WORK
Depth of till is regulated by adjusting skids up or
down. (Figure 3-1) Average soil with reasonable
moisture will allow maximum depth in one pass with
a tractor forward speed up to 2 mph. Hard soil may
require two passes to reach maximum depth.
Tractor forward speed and rear shield adjustment
(Figure 3-1) will regulate the finished results or tilth of
soil. Traveling at the slowest forward speed with rear
shield fully lowered will give finest possible finish.
This shield adjustment is good for mulching, mixing,
and burying weeds, fertilizer, etc. The more you
increase forward speed and shield height, the coarser the finished results will be. To leave the ground
surface rough with larger clods and residue exposed,
work with shield fully raised. When working in rocky
soil, always have shield in raised position.
Figure 3-1 Adjustments
Adjustable, Spring-Loaded
Shock Absorber
3-3 OPERATION
A. Perform BEFORE EACH USE maintenance
listed in paragraph 4-1.
B. Adjust for work per paragraph 3-2.
C. Start tractor. Raise tiller off the ground.
D. With tractor at idle speed, engage PTO drive.
DANGER
STAY CLEAR OF ROTATING DRIVELINES.
DO NOT OPERATE WITHOUT DRIVELINE
SHIELDS IN PLACE AND IN GOOD CONDITION. FAILURE TO HEED THESE WARNINGS MAY RESULT IN PERSONAL INJURY
OR DEATH.
DANGER
KEEP HANDS AND FEET FR OM UNDER
MACHINE AT ALL TIMES. MAKE CERTAIN
EVE RYO NE I S C LEA R O F M ACH INE
BEFORE OPERATING. FAILURE TO HEED
THESE WARNINGS MAY RESULT IN PERSONAL INJURY OR DEATH.
E. Place tractor in gear and proceed forward.
Increase speed to 3/4 throttle. Lower tiller into soil.
Increase speed to 540 PTO rpm. Average soil with
reasonable moisture will allow travel speeds up to 2
mph. Hard soil will require low travel speed, less
than 1 mph to ensure smooth operation and maximum possible depth. Shallow weed cultivation will
allow speeds up to 3 mph. At the end of a pass lift
tiller clear of ground before making a turn. After turning, proceed back across field, slowly lowering the
tiller into the soil. Do not turn with tiller in the
ground as this can damage tiller and tractor linkage. Never use reverse gear while tiller is lowered into ground. Avoid operating tiller in the
raised position.
3-4 TRANSPORTING
Do not engage PTO drive while transporting tiller.
Obey all state and local laws when transporting on
public roads. Always use flashing warning lights
unless prohibited by law.
Rear Shield Height Adjuster Skid Parking Stand
9
Page 12
SECTION IV
MAINTENANCE
4-1 MAINTENANCE CHECK LIST
Perform scheduled maintenance as outlined below.
Lower machine to ground, turn off tractor and set
parking brake before doing maintenance inspections
or work. Some checks may require raising machine
off ground and supporting with blocks. All bolts
should be torqued as recommended in TORQUE
SPECIFICATIONS, unless otherwise indicated.
BEFORE EACH USE
1. Check tractor tire air pressure. Refer to tractor
operator’s manual.
WARNING
THE TILLER CAN FALL FROM HYDRAULIC
SYSTEM FAILURE. TO AVOID SERIOUS
INJURY OR DEATH, SECURELY SUPPORT
TILLER BEFORE WORKING UNDERNEATH.
2. Check blades and rotor to be sure that no foreign
objects such as wire or steel strapping bands are
wrapped around them.
3. Check blade bo lt s for t ightness. Tighten to
118 ft./lbs.
4. Inspect blades for wear. Replace if necessary.
5. Make certain driveline shields are in place and in
good repair.
6. Perform BEFORE EACH USE lubrication per
paragraph 4-2.
7. During operation, listen for abnormal sounds
Figure 4-1
(1) Before Each Use
Lubrication
To remove yoke shield,
de press the three tab s
wi th a screw driver an d
slide cover back.
which might indicate loose parts, damaged bearings, or other damage.
AFTER EACH USE
1. Clean all debris from machine especially underside.
2. Store in dry place.
4-2 LUBRICATION (Figure 4-1)
NOTE
The multi-purpose grease referenced in this sec-
tion is an NLGI Grade 2 type grease.
BEFORE EACH USE
1. Driveline Universal Joints - Apply multi-purpose
grease with grease gun.
2. Driveline Guard - Apply 2 -3 shots of multipurpose grease with grease gun to plastic fitting.
3. Driveline - Disconnect PTO driveline, pull the two
sections apart, apply thin coat of multi-purpose
greas e to inside of outer (fema le) se ction .
Reassemble sections and install. Pull each sec
tion to be sure driveline and shields are securely
connected. Make certain PTO shielding is in
good condition.
4. Input Gear bo x - Add EP80W-90 gea r oil, if
necessary, to bring oil level to check plug.
5. Lateral Gearbox - RTH Models (Gear Drive) - Add
EP80W-90 gear oil, if necessary, to bring oil level
to check plug located on side of gearbox.
6. Chain Drive - RTN,RTNR Models - Add EP80W-90
gearoil, if necessary, to bring oil level to check
plug located on side of cover.
40 HOURS
7. Rotor Shaft Bearing - Apply 2-3 shots of multipurpose grease with hand pump grease gun
every 40 hrs. of operation and before storage.
(Figure 4-2)
RT H Gear Dr iv e Oil
Filler Plug
(5) Before Each Use
RTH Check Plug
(2) Before Each Use
(7) 40 Hours
(3) Before Each Use
RTN Oil Check Plug
10
RTN Chain Drive
Oil Filler Plug
(6) Before Each Use
(4) 4Before Each Use
Check Plug
Page 13
4-3 BLADE REPLACEMENT
WARNING
THE TI LLE R CAN FALL FROM
HYD RAU LIC SY STE M F AIL URE . T O
AVOID SERIOUS INJURY OR DEATH,
SECURELY SUPPORT TILLER BEFORE
WORKING UNDERNEATH.
Tiller blades should be replaced when they have
app rox ima tel y 1/4 ” of wea r lef t o n tip of
blade.(Figure 4-2) To replace blades, remove bolts
securing blade. Install new blade in its place. Blade
must be a right or left corresponding to the blade
removed. Tighten blade bolts to 118 ft. lbs. Use
only genuine Bush Hog replacement parts.
The RTN, RTNR and RTH are designed to accomodate up to 6 blades per flange if desired.
4-4 SLIP CLUT CH OPER ATIONAL
CHECK
(IMPORTANT: Also refer to page 17)
After tiller has been stored for 30 days or more,
perform the following operational check:
A. Loosen eight nuts retaining clutch springs
exactly one full turn.
B. With tiller blades firmly on ground and tractor
at idle speed, engage tractor PTO drive for 2-3 seconds. Clutch should slip without turning blades. If
clutch does not slip, contact your authorized Bush
Hog dealer.
C. Retighten nuts to within 1/64” of original position.
Initial spring length is 1-3/32” (27.6mm). (Figure 4-3)
CAUTION
FAILURE TO RETIGHTEN SPRING NUTS
TO ORIGINAL POSITION MAY CAU SE
DAMAGE TO TILLER AND/OR TRACTOR
DUE T O I MPR OPE R SLIP C LUT CH
TORQUE SETTING.
4-5 SLIP CLUTCH ADJUSTMENT
(IMPORTANT: Also refer to page 17)
The slip clutch is factory preset to the correct torque
fo r protecting implement and tr ac to r. Periodic
adjustment is recommended; refer to Section 4-4.
Should adjustment be needed, first check to be sure
all spring lengths are within 1/64” of being the same.
Initial spring length is 1-3/32” (27.6mm) shown in
Figure 4-3. If necessary, loosen nut on any spring
that is unequal. Adjust all eight spring retaining nuts
2/3 of a turn (2 flats on a nut) and check clutch slippage. If further adjustment is necessary, do so in 1/3
turn increments or consult your Bush Hog dealer.
Adjust only to provide sufficient torque to prevent slippage under normal conditions. When rocks, roots,
etc. are present, occasional slippage is normal for dri-
vetrain protection.
Figure 4-2 Blade Wear
Figure 4-3
Clutch Spring Length
1-3/32”
(27.6mm)
1/4”
4-6 RTN CHAIN ADJUSTMENT (Figure 4-4)
A. Turn tractor off and set parking brake before
making chain adjustment.
B. Block up tiller by placing wooded block under-
neath the skids.
WARNING
THE TIL LER CAN F ALL FRO M
HYDRAULIC SYSTEM FAILURE. TO AVOID
SERIOUS INJURY OR DEATH, SECURELY
SU PPORT TILLER BEFORE WOR KING
UNDERNEATH
C. The drive chain on the Model RTN, RTNR tiller is
preset with the correct chain tension when it leaves
the factory. After an extended period of use the
chain will wear and it will be necessary to make
adjustment to the chain through the chain adjusting
bolt located on the outside of the chain case.
D. Measure the initial length of the chain tension
fastener before beginning. Rotate the bolt clockwise
to tighten the chain tension bolt to remove excess
motion of the chain. Only small increments of bolt
turns should be made, then listen for the amount of
lost motion in the chain. To much chain tension and
the rotor will be difficult to rotate.
DO NOT OVERTIGHTEN THE CHAIN TENSIONER.
PR EMATURE FAILURE CAN OCCUR TO TH E
CHAIN OR BEARING IF OVERTIGHTENED.
Figure 4-4
Chain Adjustment
Adjusting Bolt
Bears On This Pad
NOTE:
RT NR Te ns io ner Bar
And Adjusting Bolt Are
Lo cated On Opposit e
Side Of Chain Case
11
RTN Chain Tensioner Bar
Page 14
4-7 TROUBLESHOOTING
Troubleshooting procedures are listed in Table 4-1
below. If the problem cannot be solved or replace-
Table 4-1 Troubleshooting
PROBLEM PROBABLE CAUSE REMEDY
Uneven Till Tiller not level right to left Adjust skids for same depth
Noisy Loose components Check all bolts for tightness. Refer to Torque Specs
Low oil in gearbox Check for proper oil level. Refer to Lubrication Section
Knocking or Tiller is tilted towards the rear Adjust 3-point hitch top link to level tiller
Chattering
Bogging Tractor engine speed too slow Increase engine speed to 540 PTO rpm
Ground speed too fast Use lower tractor gear
Vines wrapped around rotor Remove vines
Loose Chain Chain worn Adjust chain idler or replace chain
(RTN, RTNR Models)
ment parts are necessary, contact your authorized
Bush Hog dealer. Please have ready your machine
name, model number, serial number, purchase date,
and exact cause or description of problem.
Adjust tractor lower lift arms
12
Page 15
SECTION V
DEALER ASSEMBLY
WARNING
THE FOLLOWING SAFETY PRECAUTIONS SHOULD
BE THOROUGHLY UNDERSTOOD BEFORE
ATTEMPTING MACHINE ASSEMBLY
1. Wear personal protective equipment such as, but not limited to, protection for eyes, ears, feet, hands and
head when operating or repairing the equipment. Do not wear loose clothing or jewelry that may catch on
equipment moving parts.
2. Do not lift heavy parts or assemblies. Use crane, jack, tackle, fork trucks or other mechanical devices.
3. Select an area for assembly that is clean and free of any debris which ;might cause persons working on the
assembly to trip.
4. Arrange parts to be assembled neatly in the work area and have tools or other mechanical assisting
devices in easy reach.
5. Inspect all parts and assemblies thoroughly and remove any sharp edges, grease, oil, or dirt which might
cause pieces to slip when handling.
6. Preview the assembly instructions in your operator’s manual before proceeding further.
7. If the assembly instructions call for parts or assemblies to be blocked up, use only blocking material that is
in good condition and is capable of handling the weight of the assembly to be blocked. Also insure that the
blocking material is on a clean, dry surface.
8. Never put hands or any other part of body under blocked up assemblies if at all possible.
9. Always wear goggles or safety glasses when hammering, grinding or drilling metal parts.
10. If the assembly calls for welding or cutting, be sure that there are no flammable materials close at hand and
that bystanders have taken necessary precautions.
AFTER COMPLETING ANY ASSEMBLY STEP, THOROUGHLY READ THE NEXT STEP IN THE ASSEMBLY
INSTRUCTIONS BEFORE PROCEEDING WITH THAT STEP.
11. Af ter c omp let ing a sse mbl y, thoroughly in spe ct the ma chi ne to b e sur e tha t all nuts, bolts,
or any other fastened assemblies have been thoroughly tightened.
12. After completing assembly, be sure that all safety locking devices or guards are in place.
13. Before operating the machine, thoroughly read the operation section of this manual.
14. Before operating, read the maintenance section of this manual to be sure that any parts requiring lubrication
such as gearboxes are full to avoid any possible damage.
BEFORE OPERATING THE EQUIPMENT, IF YOU HAVE ANY QUESTIONS REGARDING THE PROPER
ASSEMBLY OR OPERATION, CONTACT YOUR AUTHORIZED BUSH HOG DEALER OR REPRESENTATIVE.
Refer to Figures 5-1 and 5-2 on next page.
A. Insert parking stand into mounting bracket and
fasten with “L” pin and presto pin.
B. Attach slip clutch end of driveline onto input gear
box shaft. Make certain driveline yoke is securely
locked into position.
C. Fasten “A” frame masts to strongbacks with
fasteners provided.
D. Place clutch shield over slip clutch and fasten
into place using fasteners provided. The clutch
shi eld wil l at tac h to a lug on th e ge arb ox.
E. Attach shock absorber mounting brackets to the
strongbacks as shown. Two sets of holes in the
bracket s wi ll ali gn with ho les in the stron g
backs.
F. M oun t the sh ock a bsorber a sse mbl ies a s
shown.The appropriate top mounting holes will
be determined during operation.
G. Check input gearbox and chain or gear end
drive boxes for lubricant. (See Maintenance
Section)
H. Tighten all fasteners to specifications given in
“Torque Chart”.
IMPORTANT
Before delivery to customer, perform
slip clutch operation check as described
in Section 4-4.
13
Page 16
Figure 5-1
RTN Series Tiller
Parking Stand
Gear Drive End Box
“A” Frame Mast
Strongback
Cluch Shield
Mounting Tab
Slip Clutch
Clutch Shield
Chain Drive
End Box
Shock Absorber Assembly
Shock Absorber Mounting Brackets
Figure 5-2
RTH Series Tiller
14
Page 17
SAFETY DECALS
To promote safe operation, Bush Hog supplies safety decals on all products manufactured. Because damage
can occur to safety decals either through shipment, use or reconditioning, Bush Hog will, upon request, provide
safety decals for any of our products in the field at no charge. Contact your authorized Bush Hog dealer for
more information.
Part No. 78413
Part No. 78608
Part No. 60873
Part No. 78786
Part No. 81067
15
Page 18
Wrench
Size “A”
AMERICAN
Bolt Head Markings
SAE Grade 2
(No Dashes)
SAE Grade 5
(3 Dashes)
SAE Grade 8
(6 Dashes)
TORQUE SPECIFICATIONS
Proper toque for American fasteners used on Bush Hog equipment.
Recommended Torque in Foot Pounds (Newton Meters).*
W R ENC H (I N .) “B ” A ND S AE SAE S A E
S IZ E (IN. ) “A ” T HR E A D S IZ E GRA D E 2 G RA D E 5 G RA D E 8
/16 1/4 - 2O UNC 6 (7) 8 (11) 12 (16)
7
7/16 1/4 - 28 UNF 6 (8) 10 (13) 14 (18)
1/2 5/16 - 18 UNC 11 (15) 17 (23) 25 (33)
1/2 5/16 - 24 UNF 13 (17) 19 (26) 27 (37)
9/16 3/8 - 16 UNC 20 (27) 31 (42) 44 (60)
9/16 3/8 - 24 UNF 23 (31) 35 (47) 49 (66)
/8 7/16 - 14 UNC 32 (43) 49 (66) 70 (95)
5
5/8 7/16 - 20 UNF 36 (49) 55 (75) 78 (106)
3/4 1/2 - 13 UNC 49 (66) 76 (103) 106 (144)
3/4 1/2 - 20 UNF 55 (75) 85 (115) 120 (163)
7/8 9/16 - 12 UNC 70 (95) 109 (148) 153 (207)
7/8 9/16 - 18 UNF 79 (107) 122 (165) 172 (233)
15/16 5/8 - 11 UNC 97 (131) 150 (203) 212 (287)
5/16 5/8 - 18 UNF 110 (149) 170 (230) 240 (325)
1
1-1/8 3/4 - 10 UNC 144 (195) 266 (360) 376 (509)
1-1/8 3/4 - 16 UNF 192 (260) 297 (402) 420 (569)
t
ol
B
eter
am
Di
1-5/16 7/8 - 9 UNC 166 (225) 430 (583) 606 (821)
B”
“
1-5/16 7/8 - 14 UNF 184 (249) 474 (642) 668 (905)
1-1/2 1 - 8 UNC 250 (339) 644 (873) 909 (1232)
1-1/2 1 - 12 UNF 274 (371) 705 (955) 995 (1348)
1-1/2 1 - 14 UNF 280 (379) 721 (977) 1019 (1381)
1-11/16 1-1/8 - 7 UNC 354 (480) 795 (1077) 1288(1745)
1-11/16 1-1/8 - 12 UNF 397 (538) 890 (1206) 1444 (1957)
1-7/8 1-1/4 - 7 UNC 500 (678) 1120 (1518) 1817 (2462)
1-7/8 1-1/4 - 12 UNF 553 (749) 1241 (1682) 2013 (2728)
2-1/16 1-3/8 - 6 UNC 655 (887) 1470 (1992) 2382 (3228)
2-1/16 1-3/8 - 12 UNF 746 (1011) 1672 (2266) 2712 (3675)
2-1/4 1-1/2 - 6 UNC 870 (1179) 1950 (2642) 3161 (4283)
2-1/4 1-1/2 - 12 UNF 979 (1327) 2194 (2973) 3557 (4820)
B OL T D IA M E TE R
METRIC
Wrench
Size “A”
Diamet
8.8
Bo
lt
”
er “B
Numbers appearing on bolt heads
indicate ASTM class.
*Use 7 5 % of th e s p e cified to rq ue v a lu e f or
p la ted fa st ener s . U se 8 5 % o f the s p eci -
fied to rq ue val ues fo r lu b rica ted fa s te n e rs .
Proper torque for metric fasteners used on Bush Hog equipment.
Recommended torque in foot pounds (newton Meters).*
—WRENCH BOLT
SIZE DIA. ASTM ASTM ASTM ASTM
(mm) “A” (mm) “B” 4.6 8.8 9.8 10.9
851.8 (2.4) 5.1 (6.9) 6.5 (8.8)
10 6 3 (4) 8.7 (12) 11.1 (15)
13 8 7.3 (10) 21.1 (29) 27 (37)
16 10 14.5 (20) 42 (57) 53 (72)
18 12 25 (34) 74 (100) 73 (99) 93 (126)
21 14 40 (54) 118 (160) 116 (157) 148 (201)
24 16 62 (84) 167 (226) 181 (245) 230 (312)
30 20 122 (165) 325 (440) 449 (608)
33 22 443 (600) 611 (828)
36 24 211 (286) 563 (763) 778 (1054)
41 27 821 (1112) 1138 (1542)
46 30 418 (566) 1119 (1516) 1547 (2096)
16
Page 19
Supplemental Slip Clutch Instructions for the
RTH, RTN & RTNR Tillers
Bush Hog RTH, RTN and RTNR tillers may have either of two different types of slip clutches.
The drivelines equipped with Belleville spring plates require a more precise measurement
than the clutches equipped with external coil springs.
The compression of the Belleville spring many need to be adjusted if the clutch slips with the
original settings. Clutch slippage may occur from excessive tractor horsepower or ground
speed. If clutch slips, stop the tractor and tighten the adjusting nuts one flat at each of the
clutch bolts. Continue this process until the clutch stops slipping. Be sure to adjust the eight
nuts equally. Find the proper settings for your model in the chart below.
CAUTION:
Failure to compress the Belleville spring plate to the correct measurement may cause damage to the implement and / or the tractor due to
improper slip clutch torque settings
Clutch Machines Settings Belleville Spring
FV32
NM IN Part h
LBS NUMBER MM IN
RTN, RTNR 640 5664 367009860 17.2 .68”
RTH 900 7965 367006860 18.2 .72”
17
Page 20
P.O. Box 1039llSelma, AL 36702-1039
Telephone (334) 874-2700
ll
www.bushhog.com
Loading...