Bush Hog EFM 480/600 User manual

OPERATION ll MAINTENANCE
04/09 Rev.1 $4.00 50024642
EFM 480/600
Economy Finishing Mower
Operator’s Manual
BUSH HOG®

CONGRATULAT ONS!
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.
f your manual should become lost or destroyed, Bush Hog will be glad to provide you with
a new copy. Order from Bush Hog, 2501 Griffin Ave., Selma, Alabama 36703. 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 manufac-
tured with the same precision and skill as our original equipment. Our trained service per-
sonnel 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 AUTHOR ZED
BUSH HOG DEALER
BECAUSE BUSH HOG MA NTA NS AN ONGO NG
PROGRAM OF PRODUCT MPROVEMENT, WE
RESERVE THE R GHT TO MAKE MPROVEMENTS N
DES GN OR CHANGES N SPEC F CAT ONS W TH-
OUT NCURR NG ANY OBL GAT ON TO NSTALL
THEM ON UN TS PREV OUSLY SOLD.
BECAUSE OF THE POSS B L TY THAT SOME
PHOTOGRAPHS N TH S MANUAL WERE TAKEN OF
PROTOTYPE MODELS, PRODUCT ON MODELS MAY
VARY N SOME DETA L. N ADD T ON, SOME
PHOTOGRAPHS MAY SHOW SH ELDS REMOVED
FOR PURPOSES OF CLAR TY. NEVER OPERATE
TH S MPLEMENT W THOUT ALL SH ELDS N PLACE.

EFM 480/600
Operator’s Manual
TABLE OF CONTENTS
SECTION/PARA PAGE
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . .2
Dealer Preparation Check List . . . . . . . . .3
Safety Precautions . . . . . . . . . . . . . . . . . .4
Federal Laws and Regulations . . . . . . . . .6
NTRODUCT ON AND DESCR PT ON . .7
1-1 ntroduction . . . . . . . . . . . . . . . . . . . . .7
1-2 Description . . . . . . . . . . . . . . . . . . . . .7
PREPARAT ON FOR USE . . . . . . . . . . . .8
2-1 Attaching to Tractor . . . . . . . . . . . . . . .8
OPERAT NG NSTRUCT ONS . . . . . . . .10
3-1 General Safety . . . . . . . . . . . . . . . . .10
3-2 Cutting Height Adjustment . . . . . . . . .10
3-3 Operation . . . . . . . . . . . . . . . . . . . . . .10
3-4 Transporting . . . . . . . . . . . . . . . . . . . .10
SECTION/PARA PAGE
V MA NTENANCE . . . . . . . . . . . . . . . . . . . .11
4-1 Maintenance Check List . . . . . . . . . .11
4-2 Lubrication . . . . . . . . . . . . . . . . . . . . .11
4-3 Belt Adjustment . . . . . . . . . . . . . . . . .12
4-4 Belt Replacement . . . . . . . . . . . . . . .12
4-5 Blade Replacement . . . . . . . . . . . . . .13
4-6 Troubleshooting . . . . . . . . . . . . . . . . .13
V DEALER ASSEMBLY . . . . . . . . . . . . . . .14
5-1 Base Unit Assembly . . . . . . . . . . . . . .14
Safety Decals . . . . . . . . . . . . . . . . . . . . . .16
Torque Specifications . . . . . . . . . . . . . . .17
RETAIL CUSTOMER’S RESPONSIBILITY
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 travel-
ing to or hauling of the product for the purpose of performing a warranty obligation or
inspection.
1

L M TED WARRANTY
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
Bush Hog warrants to the original purchaser of any new Bush Hog equipment, purchased from an
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. Model EFM gearboxes are covered by a five (5) year limited warranty period. The obligation
of Bush Hog to the purchaser under this warranty is limited to the repair or replacement of defective parts.
Replacement or repair parts installed in the equipment covered by this limited warranty are warranted
for ninety (90) days from the date of purchase of such part or to the expiration of the applicable new equip-
ment 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 equip-
ment or parts which are claimed to have been defective in material or workmanship.
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. f the unit has been subjected to misapplication, abuse, misuse, negligence, fire or other accident.
3. f parts not made or supplied by Bush Hog have been used in connection with the unit, if, in the sole judge-
ment of Bush Hog such use affects its performance, stability or reliability.
4. f 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.
NO EMPLOYEE OR REPRESENTAT VE OF BUSH HOG S AUTHOR ZED TO CHANGE TH S L M TED
WARRANTY N ANY WAY OR GRANT ANY OTHER WARRANTY UNLESS SUCH CHANGE S MADE N
WR T NG AND S GNED BY BUSH HOG’S SERV CE MANAGER, 2501 GR FF N AVE., SELMA, ALABAMA
36703.
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 CERTA N THE WARRANTY NFORMAT ON
HAS BEEN F LED ONL NE W TH BUSH HOG
SELMA, ALABAMA
.
MODEL NUMBER
SER AL NUMBER
DATE OF RETA L SALE
2

DEALER PREPARAT ON CHECK L ST
EFM 480/600 Finishing Mowers
BEFORE DEL VER NG MACH NE — The following check list should be completed.
Use the Operator’s Manual as a guide.
r1. Assembled completed.
r2. Gearboxes filled with oil.
r3. All fittings lubricated.
r4. All shields in place and in good condition.
r5. All fasteners torqued to specifications given in Torque Chart
r6. All decals in place and readable. (See decal page.)
r7. Overall condition good (i.e. paint, welds)
r8. Operators manual has been delivered to owner and he has been instructed
on the safe and proper use of the cutter.
r9. Warranty information has been filed online with Bush Hog.
Dealer’s
Signature
Purchaser’s
Signature
TH S CHECKL ST TO REMA N N OWNER’S MANUAL
t is the responsibility of the dealer to complete the procedures listed
above before delivery of this implement to the customer.
3

Safety Alert Symbol
This Safety Alert Symbol means: “ATTENTION! BECOME ALERT!
YOUR SAFETY IS INVOLVED!”
This symbol is used to call attention to safety pre-
cautions 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 precau-
tions could result in death or serious bodily
injury.
Safety Signs Signal Words
The signal words DANGER, WARNING, AND CAUTION are used on the equipment safety signs. These words
are intended to alert the viewer to the existence and the degree of hazard seriousness.
This signal word indicates a potentially hazardous situation
which, if not avoided, will result in death or serious injury.
White letters on RED
This signal word indicates a potentially hazardous situation
which, if not avoided, could result in death or serious injury
t may also be used to alert against unsafe practices.
Black letters on ORANGE
This signal word indicates a potentially hazardous situation exist
which, if not avoided, may result in minor or moderate injury.
t may also be used to alert against unsafe practices.
Black letters on YELLOW
4

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 fol-
lows and heed its advice. Failure to comply
with safety precautions could result in death or
serious bodily injury.
n addition to the design and configuration of equipment, hazard control and accident prevention are depen-
dent 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, personal injury,
reduction of efficiency and worst of all—loss of life. Watch for safety hazards and correct deficiencies
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 mainte-
nance 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 cutter. 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 mowing whenever anyone comes within the operating area.
7. Clear the work area of objects which might be picked up and thrown.
8. Use a piece of cardboard or wood rather than hands to search for hydraulic leaks. Escaping hydraulic
oil under pressure can penetrate skin. f fluid is injected into the skin, it must be surgically removed
within a few hours by a doctor familiar with this form of injury or gangrene may result.
9. Do not operate without all guards and shields in place and in good condition.
10. Lower implement to ground, stop tractor engine, apply parking brake, and allow blades to completely
stop before leaving the tractor.
11. Keep hands and feet away from blades.
12. This cutter is not to be operated along highways or in any area where people may be present unless
all sides of the unit are enclosed by permanent bands, safety chains or other factory approved safety
shields that are in good repair.
13. 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.
14. When performing adjustments or maintenance on the cutter, first lower it to the ground or block it
securely at a workable height.
15. Never stand between tractor and cutter while tractor is being backed to the cutter hitch.
16. Reduce speed when transporting cutter to avoid bouncing and momentary loss of steering.
17. Use tractor flashing warning lights, day or night, when transporting cutter on road or highways unless
prohibited by law.
18. t is recommended that tractor be equipped with Rollover Protective System (ROPS) and seat belt be
used in all mowing operations.
5

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. t 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...”
DUT ES
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.
Child Labor Under 16 Years Old
Some regulations specify that no one under the age of 16 may operate power machinery. t 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.)
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.
6

1-1 INTRODUCTION
We are pleased to have you as a Bush Hog cus-
tomer. Your EFM Series Rotary Cutter 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 cutter in top
operating condition. Please read this manual thor-
oughly. 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 implement. f any assistance or
additional information is needed, contact your autho-
rized Bush Hog dealer.
1-2 DESCRIPTION
The EFM cutters (Figure 1-1) are intended for cutting
lawns or any maintained area where a clean, uni-
form finish is desired. Parallel uplift blades form a
suction during operation to lift the grass before cut-
ting it. The four caster wheel arrangement, along
with the floating lift linkage and optional front mount-
ed roller, all work together to give an even cut and
minimize scalping.
Power from the tractor is transmitted through a trian-
gular, telescoping driveline to the 90 degree gear-
box. t is then passed to the spindle housings and
blades by a single, B-section, Kevlar reinforced belt.
Drivetrain protection is provided by belt slippage.
Table 1-1 EFM Specifications
EFM 480 EFM 600
Cutting Width (in.) 48 60
Cutting Height (in.) 1 to 6
Horsepower Range 14 - 30
Blade Tip Speed (fpm) 14,800 16,800
Weight (lbs.) 420 450
SECTION I
INTRODUCTION AND DESCRIPTION
NOTE
All references made to right, left, top,
bottom, front or rear are as viewed
facing the direction of travel with
implement properly attached to trac-
tor.
7
Figure 1-1 EFM 480

2-1 ATTACHING TO TRACTOR
A. Attach to tractor Cat. three point hitch as
described in tractor operator’s manual.
SECTION II
PREPARATION FOR USE
B. Raise and lower cutter to determine position
with shortest distance between the tractor PTO shaft
and gearbox input shaft. Shut down tractor leaving
cutter in position of shortest distance. SECURELY
BLOCK CUTTER N POS T ON.
C. Pull driveline apart. Attach outer (female) sec-
tion to tractor PTO shaft. Pull on driveline section to
be sure yoke locks into place.
D. Hold driveline sections parallel to each other to
determine if too long. Each section should end
approximately 3 inches (76mm) short of reaching
universal joint shield on opposite section. f too long,
measure 3 inches (76mm) back from universal joint
shield and mark opposite section. (Figure 2-1). Do
this for both sections.
E. Raise and lower cutter to determine position
with greatest distance between PTO shaft and gear-
box input shaft. Shut down tractor leaving cutter in
position of greatest distance. SECURELYBLOCK
CUTTER N POS T ON.
F. Hold down driveline sections parallel to each
other and check for minimum 6 inches (152mm)
overlap. (Figure 2-2) f driveline has been marked for
cutting, overlap will be the distance between two
marks. f driveline has less than minimum overlap,
DO NOT USE. Contact authorized Bush Hog dealer.
WARNING
NEVER STAND BETWEEN TRACTOR
AND CUTTER WHILE TRACTOR IS
BEING BACKED TO HITCH.
WARNING
ADDITIONAL TRACTOR FRONT
BALLAST MAY BE NEEDED FOR
STABLE OPERATION AND TRANSPORT
OF CUTTER. SEE TRACTOR OPERA-
TOR’S MANUAL FOR RECOMMENDED
WEIGHTS. IT IS RECOMMENDED THAT
TRACTOR BE EQUIPPED WITH
ROLLOVER PROTECTIVE SYSTEM
(ROPS) AND SEAT BELTS.
NOTE
Due to the many variations in trac-
tor/implement hitch points and corre-
sponding differences in distances between
tractor PTO shafts and implement input
shafts, drivelines may need to be short-
ened as described in the following steps:
NOTE
f driveline is correct length, omit the fol-
lowing steps “G” through “J” and proceed
to step “K”.
Figure 2-1 Figure 2-2 Minimum
Overlap
8

G. Clamp end of driveline in a vice. 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)
. Repeat steps “G” and “H” to other driveline sec-
tion.
J. Deburr ends of driveline sections and clean
away all chips and filings. (Figure 2-5)
K. Apply multi-purpose grease to outside of male
driveline section. Assemble driveline and install on
tractor and cutter. Pull on each driveline section to
be sure yokes lock into place. Make certain driveline
shielding is in place and in good condition.
Figure 2-4
Figure 2-5
MAKE CERTAIN DRIVELINE YOKES
ARE SECURELY FASTENED. FAILURE
TO DO SO MAY RESULT IN SERIOUS
IN URY.
L. Raise cutter off ground and adjust lower lift
arms to level cutter right to left. Refer to tractor oper-
ator’s manual.
M. Lower cutter to work position. Adjust tractor
top link to position cutter top flex link as shown in
Figure 2-6. This allows cutter to “float” during opera-
tion. Also lower the tractor lift arms so that lower
links can also “float”.
N. Adjust tractor sway chains, stabilizer bar or
equivalent to prevent side sway.
Figure 2-6 Flex-Link
DANGER
9
Tractor
Top Link
Tractor
Lower Lift Arm
Lower Link n
Floating Position
Lower Link
Assembled n
“Close To Tractor”
Position

SECTION III
OPERATING INSTRUCTIONS
3-1 GENERAL SAFETY
Only qualified people familiar with this operator’s
manual and tractor operator’s manual should oper-
ate this machine. Operator should wear hard hat,
safety glasses and safety shoes. The operator
should read, understand and practice all safety mes-
sages shown on the caution, warning and danger
decals affixed to the cutter to avoid serious injury or
death. t is recommended that tractor be equipped
with Rollover Protective System (ROPS) and a seat
belt be used. Before beginning operation, clear work
area of any objects that may be picked up and
thrown. Check for ditches, stumps, holes or other
obstacles that could upset tractor or damage cutter.
Always lower cutter to ground and allow blades to
come to a complete stop, set parking brake and turn
off tractor engine before leaving tractor operator’s
seat.
3-2 CUTTING HEIGHT AD USTMENT
The cutter should be operated at the highest position
that will give desired cutting results. This will help pre-
vent blades from striking the ground, reducing blade
wear and undue strain on the machine. Cutting too
much material will leave excess clippings on the lawn
surface. The more frequently the lawn is mowed, the
better the effect will be. Adjust as follows:
A. Raise cutter off ground using tractor 3-point
lift. SECURELY BLOCK CUTTER N POS T ON.
B. Remove pin securing caster wheel to bracket.
(Figure 3-1) Remove caster wheel from arm.
C. Place amount of spacers on caster wheel to
give desired cutting height. With no spacers on the
bottom, a 1” or slightly lower cutting height is given.
D. Reinstall caster wheel into caster arm. Place
remaining spacers on caster wheel and install pin to
retain.
E. Repeat operation for all caster wheels. Make
certain all wheels are adjusted to the same height.
3-3 OPERATION
A. Perform BEFORE EACH USE maintenance
list in paragraph 4-1.
B. Start tractor. Lower cutter until it is supported
by caster wheels. Position tractor lower lift arms as
shown in Figure 2-6, page 9. This will allow cutter
to”float” during operation.
WARNING
THE CUTTER CAN FALL FROM
HYDRAULIC SYSTEM FAILURE. TO
AVOID SERIOUS IN URY OR DEATH,
SECURELY SUPPORT CUTTER BEFORE
WORKING UNDERNEATH
C. With tractor at idle speed, engage PTO drive.
Advance throttle to 540 PTO rpm.
D. Place tractor in low gear and begin cutting.
Tractor forward speed should be controlled by gear
selection, not engine speed. For maximum cutting
efficiency, forward speed should allow cutter to
maintain a constant maximum blade speed.
Cutting height should not put undue strain on tractor
and implement drivetrain. f tractor engine or cutter
stalls, do not slip tractor clutch to allow engine to
retain speed as this will exert undue strain on the
implement drivetrain. When stalling occurs, disen-
gage PTO drive, move to a cut area, set tractor
throttle to idle, then re-engage PTO drive.
Always cut up and down the face of slopes, never
across.
Check belt tension after first 8 hours.
3-4 TRANSPORTING
Turn off PTO drive and fully raise tractor 3-point lift
before transporting. When implement is transported
on road or highway, day or night, use tractor flashing
warning lights unless prohibited by law. A slow mov-
ing vehicle (SMV) sign on the tractor must be visible
from the rear by approaching vehicles.
STAND CLEAR OF ROTATING CUTTER
BLADES UNTIL ALL MOTION HAS STOPPED.
TO AVOID ACCIDENTAL FALL AND POSSIBLE
IN URY FROM CUTTER,IT IS RECOMMENDED
THAT TRACTOR BE EQUIPPED WITH
ROLLOVER PROTECTIVE SYSTEM AND THAT
A SEAT BELT BE USED FOR ALL OPERA-
TIONS.
DANGER
STAY CLEAR OF ROTATING DRIVELINE. DO
NOT OPERATE WITHOUT DRIVELINE SHIELDS
IN PLACE AND IN GOOD CONDITION. FAILURE
TO HEED THESE WARNINGS MAY RESULT IN
PERSONAL IN URY OR DEATH.
DANGER
Spacers
Caster
Wheel
10
Figure 3-1

SECTION IV
MAINTENANCE
4-1 MAINTENANCE CHECK LIST
Perform scheduled maintenance as outlined below.
Lower implement 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 indicated in torque chart
unless otherwise indicated.
THE CUTTER CAN FALL FROM
HYDRAULIC SYSTEM FAILURE. TO
AVOID SERIOUS IN URY OR DEATH,
SECURELY SUPPORT CUTTER BEFORE
WORKING UNDERNEATH.
BEFORE EACH USE.
1. Check tractor tire air pressure. Refer to tractor
operator’s manual. Check mower tire pressure (if
pneumatic tires). Tire pressure should be 30 psi.
2. Check blades and spindles to be sure that
no foreign objects such as wire or steel strapping
bands are wrapped around them.
3. Check blade bolts for tightness. Tighten
blade bolts to 76 ft./lbs.
4. nspect blades for wear. Replace if necessary
per paragraph 4-5. Use only genuine Bush Hog
replacement parts. f it is necessary to sharpen the
blades, remove the blades from the spindles before
sharpening. DO NOT sharpen blades while still
attached to mower.
5. Make certain all shields are in place and in
good condition. Repair or replace any missing or
damaged shields.
6. nspect wheel(s) for wear, damage or foreign
objects. Repair or replace if necessary.
7. Perform BEFORE EACH USE lubrication per
paragraph 4-2.
8.During operation, listen for abnormal sounds
which might indicate loose parts, damaged bearings,
or other damage. Correct any deficiency before con-
tinuing operation.
AFTER EACH USE
1. Clean all debris from machine especially under-
side of deck, underneath belt shield and off safety
decals. Replace any missing or illegible decals.
2. nspect cutter for worn or damaged compo-
nents. Repair or replace before next use. Any
replacement components installed during repair shall
include the components’ current safety decals speci-
fied by the manufacturer to be affixed to the compo-
nent.
3. Store cutter in a dry place.
40 HOURS
1. Check belt for proper tension. Refer to para-
graph 4-3.
4-2 LUBRICATION (Figures 4-1A, & B)
BEFORE EACH USE
1. Driveline Universal Joints - Apply multi-purpose
grease with grease gun.
2. Driveline Guard - Apply 2-3 shots of multi-pur-
pose grease with grease gun to plastic fitting.
3. Wheels - Apply multi-purpose grease wiith
grease gun.
4. Caster Pivot - Apply multi-purpose grease with
grease gun. 40 HOURS
5. nput Gearbox - Add EP80W-90 gear oil, if nec-
essary, to bring oil level to check plug.
20 HOURS
6. Driveline - Disconnect PTO driveline, pull the
two sections apart, thoroughly clean old grease from
tubes and apply thin coat of multi-purpose grease to
outside of inner (male) section. Reassemble sec-
tions and install. Pull each section to be sure drive-
line and shields are securely connected. Make cer-
tain PTO shielding is in good condition.
NOTE
The multi-purpose grease referenced in this
secftion is an NLG Grade 2 type grease.
Figure 4-1B (6) 20 Hours
(2) Before Each Use
(1) Before Each Use
11
(4) Before Each Use
Figure 4-1A
(5) Before Each Use
(3) Before Each Use
WARNING

4-3 BELT AD USTMENT
Belt tensions should be checked every 40 hours to
get maximum life from drive belts and best perfor-
mance from the cutter. Belt tension is adjusted by
increasing or decreasing the length of the spring on
the moveable idler. For proper belt tension on the
mower, the spring lengths should be set at 2-7/8”.
(Figure 4-1 C) To adjust the spring length, loosen or
tighten the 3/8” hex nuts on the spring adjustment rod
until the correct spring length is reached.
Figure 4-1C 1/2” Hex Nuts - Spring Length Adjustment
4-4 BELT REPLACEMENT
Use only genuine Bush Hog replacement parts.
A. Remove right and left side shields.
B. Relieve spring tension by loosening the two
1/2” hex nuts on the spring adjustment rod. (Figure 4-1 C)
C. Remove old belt.
D. nstall new belt as shown below. (Also refer to
the decal on underside of belt shield) Be sure that
the belt is properly positioned in all sheave grooves.
E. Adjust tension on the belt by adjusting the
length of the spring on the moveable idler. The cor-
rect spring length is 2-7/8”.
F. Replace all shields before operating machine.
12
7. Spindle Assembly - Apply 3 shots of multi-
purpose grease with grease gun every 40 hours.
Grease fittings for spindles are accessible
through holes in the shields.
(7) 40 Hours
2-7/8"
EFM 480 FRONT
2-7/8"
FRONT
BELT DIAGRAMS
EFM 600
1/2” Nuts
1/2” Nuts

4-6 TROUBLESHOOTING
Troubleshooting procedures are listed in Table 4-1 below. f the problem cannot be solved or replacement parts
are necessary, contact your authorized Bush Hog dealer. Please have ready your machine name, model num-
ber, serial number, purchase date and exact cause or description of problem.
Table 4-1 Troubleshooting
PROBLEM PROBABLE CAUSE REMEDY
Uneven Cut Cutter not level See SECT ON .
side to side or
front to rear.
Belt slipping. Adjust belt per
paragraph 4-3.
Worn or bent blade(s). Replace blade(s).
Streaking or Windrowing Possible build-up Clean cutter.
of material under
cutter.
Cutter not level. See SECT ON .
Worn blades. Replace blades.
Belt slipping. Adjust belt per
paragraph 4-3.
Noisy Cutter Loose components. Check all bolts for
tightness.
Low oil in gearbox. Check oil per paragraph 4-2.
Rapid Blade Wear Blade contacting Adjust cutting height to
(cutting edge) ground. eliminate ground contact.
Cutter Vibrating Cutter not being Set tractor throttle for
operated at rated proper PTO speed.
PTO speed.
Blade(s) bent. Replace blades.
Foreign object wrapped Remove object.
around spindle or blade.
4-5 BLADE REPLACEMENT
A. Raise cutter using tractor 3-point lift and
SECURELY BLOCK NTO POS T ON.
B. Turn off tractor, set parking brake and remove key.
C. Remove bolt and cup washer securing blade to
spindle. Remove blade.
D. nstall new blade as shown in Figure 4-2 with con-
cave side of cup washer against blade. Be sure that
blades are installed with offset in proper direction. Tighten
retaining bolt to 76 ft./lbs.
CAUTION
WEAR HEAVY WORK GLOVES TO PRO-
TECT HANDS FROM SHARP EDGES.
Figure 4-2 Blade Placement
Retaining Bolt
Cup Washer
Blade
Spindle Assembly
13

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, lungs and head when assembling the equip-
ment. 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 work-
ing on the assembly to trip.
4. Arrange parts to be assembled neatly in the
work area and have tools or other mechanical assist-
ing devices in easy reach.
5. nspect 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 oper-
ator’s manual before proceeding further.
7. f 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. f the assembly calls for welding or cutting, be
sure that there are no flammable materials close at
hand and that bystanders have taken necessary pre-
cautions.
SECTION V
DEALER ASSEMBLY
CAUTION AFTER COMPLETING ANY ASSEMBLY STEP,
THOROUGHLY READ THE NEXT STEP IN THE
ASSEMBLY INSTRUCTIONS BEFORE PRO-
CEEDING WITH THAT STEP.
11. After completing assembly, thoroughly inspect
the machine to be sure that all nuts, bolts, hydraulic
fittings 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 the machine, read the main-
tenance 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, CON-
TACT YOUR AUTHORIZED BUSH HOG DEALER
OR REPRESENTATIVE.
5-1 BASE UNIT ASSEMBLY
A. Attach lower lift links to deck assembly using
1/2 x 2” bolts, pivot bushings, flatwashers, lockwash-
ers, and hex nuts. Two holes are provided to allow
positioning the mower for clearance between the
tractor tires and the mower. (Figure 5-1)
B. nstall lift pins onto lower links, securing with
7/8” lockwashers and hex nuts.
C. Attach mast halves to deck assembly using 1/2
x 1-1/2” bolts, lockwashers and hex nuts.
D. Loosely attach two caster arms to the front of
the mower deck using 5/8 x 3-1/2” bolts, lockwash-
ers and hex nuts. Loosely attach the remaining two
caster arms to the rear of the mower deck using 5/8
x 3-1/2” bolts, lockwashers and hex nuts in each
caster arm. Attach mast supports to outside of lugs
at the rear of the mower deck using 1/2 x 1-1/4”
bolts, lockwashers and hex nuts.
Figure 5-1 Gearbox
Mast
Support
Flex Link
Caster Arm Mast Half
Spacers
Lower Lift Link
14

E. Fasten mast supports and upper flex link to
mast halves using 1/2 x 5” capscrew, pivot tube and
locknut..
F. Place two long spacers on the caster stems
and insert into caster arms. Place two long spacers
and two short spacers on the caster stem above the
caster arms. This arrangement will give a cutting
height of approximately three inches. Secure with
lynch pin retainers. With weight of cutter resting on
all four wheels, ensure that cutter is level. Tighten all
bolts on mounting brackets.
G. f front roller is purchased, install by securing
the right and left roller mounts to the deck in the
holes provided by using 3/8 x 1” carriage bolts, flat-
washers, lockwashers and hex nuts. nstall bolts
with heads to inside of deck. (Figure 5-2) Assemble
roller, roller sleeve, capscrew and locknut as shown
in Figure 5-2.
H. Fill gearbox with EP80W-90 gear oil until oil
level is at check plug on side of gearbox housing.
(Capacity is 1 quart) Replace solid fill plug with
breather plug supplied in operator’s manual pack-
age.
Figure 5-2 Optional Front Roller Assembly
Roller Mount
3/8 x 1” Carriage Bolt
Roller
Sleeve
1/2 x 6-1/2” Capscrew
Mower Deck
15

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.
16
IMPLEMENT CAN FALL FROM HYDRAULIC
SYSTEM RELEASE. TO AVOID SERIOUS
INJURY OR DEATH:
•SHUT OFF TRACTOR ENGINE, REMOVE KEY, SECURE
TRACTOR PARKING BRAKE AND BLOCK UP OR SECURELY
SUPPORT IMPLEMENT BEFORE WORKING UNDERNEATH.
•STAND CLEAR IF LOWERING OR RAISING IMPLEMENT.
50042284
50042283
50042282
50042285
78608
50012616
78786
50012615
50042281
IMPLEMENT CAN FALL FROM HYDRAULIC
SYSTEM RELEASE. TO AVOID SERIOUS
INJURY OR DEATH:
•SHUT OFF TRACTOR ENGINE, REMOVE KEY, SECURE
TRACTOR PARKING BRAKE AND BLOCK UP OR SECURELY
SUPPORT IMPLEMENT BEFORE WORKING UNDERNEATH.
•STAND CLEAR IF LOWERING OR RAISING IMPLEMENT.
50042284
50042284

BOLT DIAMETER
WRENCH (IN.) “B” AND SAE SAE SAE
SIZE (IN.) “A” THREAD SIZE GRADE 2 GRADE 5 GRADE 8
7/16 1/4 - 2O UNC 6 (7) 8 (11) 12 (16)
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)
5/8 7/16 - 14 UNC 32 (43) 49 (66) 70 (95)
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)
15/16 5/8 - 18 UNF 110 (149) 170 (230) 240 (325)
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)
1-5/16 7/8 - 9 UNC 166 (225) 430 (583) 606 (821)
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)
TORQUE SPECIFICATIONS
Proper toque for American fasteners used on Bush Hog equipment.
Recommended Torque in Foot Pounds (Newton Meters).*
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)
*Use 75% of the specified torque value for plated
fasteners. Use 85% of the specified torque values
for lubricated fasteners.
Numbers appearing on bolt heads
indicate ASTM class.
METRIC
AMERICAN
Bolt Head Markings
Wrench
Size “A”
Bolt
Diameter “B”
SAE Grade 8
(6 Dashes)
SAE Grade 2
(No Dashes)
SAE Grade 5
(3 Dashes)
Wrench
Size “A” 8.8
Bolt
Diameter “B”
17

2501 Griffin Ave. llSelma, AL 36703
Telephone [phone] llwww.bushhog.com