Brush Wolf 72HD/O User manual

SKID STEER BRUSH CUTTERS
Open Front/Extreme-Duty Series
72HD/O | 72XP/O
78HD/O | 78XP/O
Operator’s Manual
WHY READ THIS MANUAL?
Before operating your new Brush Wolf brush cutter, read this entire manual to understand
1) safety precautions, 2) operating instructions, and 3) maintenance schedule to help keep
you safe and your equipment running smoothly for years to come.

877-390-9857 | brushwolf.com
TAKE A MINUTE TO WRITE DOWN THE FOLLOWING INFORMATION
FOR FUTURE SERVICE, REPAIR, AND WARRANTY INQUIRIES.
DATE OF PURCHASE ____________________________________________________
MODEL NO. ____________________________________________________
SERIAL NO. ____________________________________________________
DEALER NAME ____________________________________________________
SALES REP NAME ____________________________________________________
DEALER PHONE NO. ____________________________________________________
DEALER EMAIL ____________________________________________________
DEALER ADDRESS ____________________________________________________
____________________________________________________
OWNER REFERENCE INFORMATION

1
877-390-9857 | brushwolf.com
THANK YOU
Welcome to the Brush Wolf family!
You’ve made a smart choice! We hope
you love your brush cutter as much as
we love making it. If you have any issues,
please contact us at any time. We’re
here to help.
Brush Wolf
877-390-9857
[email protected]
www.brushwolf.com
07/18/23
SAFETY FIRST! ..................................................2-3
OPERATING YOUR BRUSH CUTTER.....4-7
MAINTENANCE ............................................... 8-10
TROUBLESHOOTING ......................................11
HOW TO REPLACE BLADES.......................12
PARTS SECTION
72HD/O ...........................................................14-15
72XP/O ............................................................16-17
78HD/O ..........................................................18-19
78XP/O ............................................................20-21
WARRANTY INFORMATION .........................22
WHAT’S INSIDE

2
877-390-9857 | brushwolf.com
SITE INSPECTION
Before operating your brush cutter, carefully
inspect the area to be cleared. Remove any
items that may be picked up and thrown
by the cutting blades, such as wire, pipes,
rocks, etc. Mark objects that are too large
to move. This is an important step to avoid
personal injury, damage to property, the
brush cutter, or your skid steer. If an object
is struck while operating the brush cutter,
immediately shut down power to both the
brush cutter and the skid steer. Any damage
should be corrected and tested before the
continuation of cutting.
SKID STEER AUXILIARY
HYDRAULIC FLOW
Check the specifications of your brush
cutter’s rated gallons per minute (GPM) to
correctly match the hydraulic flow of your
skid steer to ensure proper operation.
FOR YOUR SAFETY, READ THESE INSTRUCTIONS.
The following safety instructions are provided to alert you to precautions that, if
not followed, may cause serious injury to yourself or to others. Please read these
instructions completely. Brush Wolf/Cross-Tech Manufacturing cannot cover every
incident that might be a hazard. Extreme caution should be used at all times. Only
use your Brush Wolf brush cutter for the purpose for which it has been designed.
EQUIPMENT INSPECTION
Disconnect the unit from the skid steer.
To inspect or to make repairs under the
cutter deck, always block the unit securely
to prevent accidental release of the lift
mechanism.
Inspect all hydraulic connections to ensure
they are tight, and hoses and shields are in
good condition before applying pressure.
Hydraulic fluid can escape under pressure
and may cause serious injury or death. If
this type of injury occurs, seek medical
attention immediately.
SAFETY GEAR
Wear safety goggles, hearing protection,
and a hard hat. Only operate the skid steer
behind a shatterproof forestry-rated door
and cab.
SAFETY FIRST!

3
877-390-9857 | brushwolf.com
BRUSH WOLF OPERATOR’S MANUAL | SAFETY FIRST!
DO NOT operate near bystanders, vehicles,
pets, livestock, or buildings. Objects may
discharge while cutting with the brush cutter
and has the potential to cause serious injury.
DO NOT operate the brush cutter until
everyone on your work crew is alerted to the
dangers of walking up to the brush cutter while
in operation.
DO NOT operate the brush cutter in conditions
with poor visibility.
DO NOT operate while intoxicated or if taking
medications that may impair your senses or
reactions.
DO NOT allow children to operate the
brush cutter. Only individuals with skid steer
experience who are well acquainted with the
rules of safe operation should be allowed to
operate the brush cutter.
DO NOT operate the skid steer without a
shatterproof forestry-rated door and cab.
DO NOT place hands, feet, or other objects
under the deck while the brush cutter is in
operation.
DO NOT raise the mower deck while blades
are rotating. Operation with the mower raised
will expose the cutting blades and may cause
serious injury or death to yourself or others.
DO NOT allow anyone or any item on top of the
mower deck while in operation.
DO NOT expose the underside of the blades
towards the cab while in operation.
DO NOT continue operation if an unexpected
object is struck. IMMEDIATELY shut down
power to both the brush cutter and the skid
steer. Disconnect the hydraulic couplers from
the power source. Evaluate the damage, repair,
and then test the unit before operation.
DO NOT leave the brush cutter unattended
while in a raised position. Always make sure
both the runners are placed firmly on the
ground and shut down the skid steer.
DO NOT attempt to straighten blades. Order
replacement blades if blades are bent, cracked,
or damaged.

4
877-390-9857 | brushwolf.com
Verify your skid steer’s hydraulic flow
to ensure it is within the brush cutter’s
rating range. The brush cutter’s gallons
per minute (GPM) rating is located on the
serial tag of the brush cutter.
OPERATING YOUR BRUSH CUTTER
CHECK BLADES
Inspect blades to ensure they are sharp,
tightened correctly, and intact. Look for
damage, dullness, and cracks. See page 9
for details.
CHECK HYDRAULIC FLUID
A low level could indicate a leak and require
a closer inspection of your unit. See page 9
for details.
CHECK NUTS & BOLTS
Check all nuts and bolts for proper
tightness. See maintenance schedule for
torque specification listed on page 10.
INSPECT THE DRIVE COMPONENTS
Remove any foreign material.
 IMPORTANT: CHECK THESE ITEMS PRIOR TO OPERATING
 START HERE
FIGURE 1: SERIAL TAG

5
877-390-9857 | brushwolf.com
3) Inspect the hydraulic couplers and wipe
off water, dust, or any debris which can
damage hydraulic components. Once
cleaned, connect the couplers from the
cutter to the auxiliary hydraulic system on
the skid steer. Twist the collars of the quick
connect couplers to secure the hydraulic
connections. ALL OPEN FRONT/EXTREME-
DUTY BRUSH CUTTERS REQUIRE A CASE
DRAIN LINE. Failure to run without a case
drain line or an improperly connected case
drain line will result in excess case pressure.
All motors are equipped with a check valve
on the top of the motor to relieve excess
case pressure. Should you see leaking from
the check valve, make sure the case drain
line is connected properly. Operating the
brush cutter without a case drain line will
cause damage to the motor and void the
warranty.
4) Make sure the hoses are routed in a way
that allows the head to make a full range of
motion. If hoses are too long and pinching
or binding, they can be made shorter by
loosening the hose bracket and feeding
additional hose length back to the cutter
deck.
5) Confirm all safety measures have been
completed per the Safety First! section
(pages 2-3). Most importantly, make sure
the area is clear of people and pets.
1) Connect the brush cutter to your skid steer
with the universal Quick Tach Mount Plate.
2) Once connected, visually check the lock
pins to make sure the brush cutter is
securely locked into place.
NOTE: All Brush Wolf brush cutters come
from the factory with the female flat faced
coupler on the pressure line and the male
coupler on the return line.
 CONNECTING THE BRUSH CUTTER
BRUSH WOLF OPERATOR’S MANUAL | OPERATING YOUR BRUSH CUTTER
FIGURE 2: HOSE ENDS
PRESSURE
RETURN
CASE DRAIN
(REQUIRED)

6
877-390-9857 | brushwolf.com
 OPERATING STEPS
When temperatures are below zero, allow
additional time for hydraulic fluid to warm
up.
4) Maintain skid steer speed appropriate for
the volume of brush to prevent stalling.
5) Stay alert for drop-offs, rocks, holes,
abandoned wells, and septic tanks. Do not
operate or drive across a steep embankment
as this may cause a rollover and possible
injuries or death.
6) To cut large diameter brush and trees,
move forward slowly to make the cut.
1) Enter the shatter-proof cab door, engage
the seat belt, release the brake, and start
the engine. The runners of the brush
cutter should be as close to the ground
as possible. Never raise the brush cutter
more than seven (7) inches off the ground
while in operation.
2) Slowly apply hydraulics to the brush cutter
and increase the engine speed to high idle.
Make sure the unit is operating smoothly
before moving the skid steer forward.
3) Check for proper blade rotation. Blades
should spin COUNTERCLOCKWISE as
viewed from above (see Figure 3). If
rotation is reversed (clockwise), either
inverse the flow from your machine or switch
the QD couplers on the hose ends. FIGURE 3: BLADE ROTATION
COUNTERCLOCKWISE
BRUSH WOLF OPERATOR’S MANUAL | OPERATING YOUR BRUSH CUTTER

7
877-390-9857 | brushwolf.com
When done, lower lift arms, make sure the
cutter is placed flat on the ground, throttle
down on the skid steer, and shut off the
hydraulic flow to the brush cutter. Stop the
engine and engage the parking brake before
leaving the cab.
DISCONNECTING HOSES:
To disconnect hoses, use proper hand
protection as the couplers may be hot. Always
replace caps on hoses once removed to
prevent contamination.
 WHEN DONE CUTTING
BRUSH WOLF OPERATOR’S MANUAL | OPERATING YOUR BRUSH CUTTER

8
877-390-9857 | brushwolf.com
BRUSH WOLF BRUSH CUTTERS ARE BUILT TO STRICT STANDARDS AND
WILL DELIVER YEARS OF DEPENDABLE SERVICE WHEN YOU FOLLOW THESE
MAINTENANCE GUIDELINES...
MAINTENANCE
 MAINTENANCE SCHEDULE
See pages 9-10 for details.
ITEM BEFORE
EACH USE
DAILY OR
EVERY 8 HOURS
AS
NEEDED
Blades Inspect
Bearing Housing Lubricant Check Oil
Blade Bolt/Nuts Torque to 775 -lbs
Bearing Housing Nuts Torque to 230 -lbs
Blade Carrier to Bearing Housing Bolts Torque to 212 -lbs
Hydraulic Motor Mount Bolts Torque to 75 -lbs
Bearing Housing Inspect
Hoses & Hose Safety Shield Inspect
Brush Cutter Clean
CAUTION: Perform maintenance on a level surface with the unit firmly on the ground and
blocked. Shut down the skid steer and remove hydraulic hoses from the power source.
DO NOT loan your brush cutter to another skid steer owner. The potential exists for hydraulic
contamination and could shorten the life of your skid steer or the hydraulic motor on your
brush cutter. Contamination of the hydraulic motor voids the warranty.

9
877-390-9857 | brushwolf.com
INSPECT BLADES
Inspect blades before each use to ensure
they are sharp, tightened correctly, and
intact. Look for damage, dullness, and
cracks. Blades should rotate freely and be
clear of obstructions. Replace the entire set
of blades if damaged.
CAUTION: Always replace the entire set of
blades. Never weld or straighten damaged
blades, as loss of blade integrity may result.
CHECK HYDRAULIC HOSES AND HOSE
SAFETY SHIELD
Check for wear, damage, or leaks. Replace if
damaged.
BRUSH WOLF OPERATOR’S MANUAL | MAINTENANCE
 BEFORE EVERY OPERATION
INSPECT THE DRIVE COMPONENTS
Inspect before each use and remove foreign
material.
CHECK THE BEARING HOUSING FOR
PROPER LUBRICANT
To check the lubricant level, remove the pipe
plug from the side of the bearing housing.
See Figure 4 for oil level and quantity. If low,
add 80W90 gear lube.
FIGURE 4: OIL PORT
Oil Port A
Oil Port B
Oil Drain Port
Oil Capacies
Mounng Posion
Vercal Spindle Down 14 oz/.41 L
Fill to Oil Port B

10
877-390-9857 | brushwolf.com
BRUSH WOLF OPERATOR’S MANUAL | MAINTENANCE
 BEFORE EVERY OPERATION
CHECK NUTS & BOLTS
Every Brush Wolf brush cutter is tested at
the factory and all nuts and bolts have been
tightened to specifications. We recommend
you check the nuts and bolts after the first 4
to 6 hours of operation; then daily or every
eight (8) hours.
Tighten the nuts that secure the blades
to the blade carrier every eight (8) hours.
Torque the nuts to 775 ft-lbs with a 1-11/16”
socket wrench. The nuts are located under
the access plate on the top of the blade
carrier (see Figure 5).
 AS NEEDED
CLEAN THE BRUSH CUTTER as needed
and look for potential damage or obstruction
that could result in poor performance.
Make sure all SAFETY DECALS are visible.
Also, tighten the nuts holding the blade
carrier to the output shaft of the bearing
housing, torque to 212 ft-lbs with a 15/16”
socket wrench.
Tighten bearing housing mounting bolts
daily or every eight (8) hours. Torque the
bolts to 230 ft-lbs.
Tighten hydraulic motor mount bolts daily or
every eight (8) hours. Torque the bolts to 75
ft-lbs.
FIGURE 5: ACCESS COVER
ACCESS COVER
BLADE NUT

11
877-390-9857 | brushwolf.com
TROUBLESHOOTING
*May damage hydraulic motor and void warranty.
**The bearing housing is equipped with a 5 psi check valve on the fill plug to save the bearing
housing seal should the motor seals become compromised. Some amount of oil seepage may
be possible if cutter is run at extreme vertical angles. Excessive leakage from the check valve
is indicative of a blown motor seal. Brush cutter should be shut down immediately to keep from
compromising the bearing housing seal.
ISSUE POTENTIAL CAUSES
CONSULT YOUR DEALER OR CONTACT BRUSH WOLF FOR
ANY QUESTIONS OR ADDITIONAL HELP.
Loss of Power
• Low hydraulic fluid level
• Overheated hydraulic fluid*
• Contaminated hydraulic fluid*
• Low gearbox lubricant level
Excessive
Unit Vibration
• Dull, broken, or damaged blades
• Blade carrier out of balance
• Loose nuts and bolts
• New blade or bolts matched with worn blade or bolts
• Wire or rope wrapped around blades
Leaking Oil
• Loose hydraulic connections
• Ruptured hydraulic motor seals**
• Loose or missing motor drain plug
• Leaking from motor safety valve: check case drain line for proper
connection
• Leaking from bearing housing safety valve: blown motor seal

12
877-390-9857 | brushwolf.com
12
HOW TO REPLACE BLADES
1) Take off the access cover (see Figure 5
on page 10) by removing the nuts and
washers.
2) Through the exposed access hole, rotate
the blade carrier to line up the nut of the
blade for access.
3) Insert a 1-11/16” socket through the
access hole and remove the nut and
drop the bolts. Caution: once nuts are
removed, blades will fall to the ground if not
supported.
4) Clean new bolts, lock-nuts, and washer
with cleaner/degreaser. Prior to assembly,
ensure all hardware is dry and free of
any contaminants including the carrier
assembly.
5) Use Primer Loctite on the bolts and nuts
according to the directions on the label.
Apply Loctite #243 to the first 10 bolt
threads to ensure coverage.
6) Assemble the new blade, the bolt, and the
nut to the carrier. The blade carrier cuts in
one direction, counterclockwise.
7) Torque the blade bolts to 775 ft-lbs. using a
1-11/16” socket.
8) Confirm the blade carrier rotates freely and
is clear of any obstructions.
9) Reinstall the access cover plate.
Perform replacement on a level surface with the brush cutter blocked off the ground.
Shut off the hydraulic power supply and disconnect hydraulic couplers.

13
877-390-9857 | brushwolf.com
PARTS
SECTION
ONLY USE GENUINE OEM PARTS
ORDER PARTS DIRECTLY
FROM BRUSH WOLF
BY CALLING 877-390-9857

14
877-390-9857 | brushwolf.com
DETAIL A
DETAIL B
A
B
11
13
15
18
19
4X
30
4X
31 33 9X
34
4X
10
10
9
6
8
12
14
27
19
20
27 32
30
16
17 22
21
23
26
25
24
29
1
5
7 4
6
2
3
3X
3X
8X
3X
3X
3X
PARTS: 72HD/O

15
ONLY USE GENUINE OEM PARTS. ORDER PARTS FROM BRUSH WOLF AT 877-390-9857
ITEM ITEM
QTY
PART
NUMBER DESCRIPTION
1 3 15066 BOLT, D-BOLT, 1 1/8-12, BW
2 3 15148 NUT, TOP LOCK, 1 1/8-12, GRADE C, PLAIN
3 3 30089 WASHER, FLAT, 1 1/8, F436, ZINC
48 30085 WASHER, FLAT, 5/8, F436, ZINC
5 1 16726 WELDMENT, 3 BLADE CARRIER, DIRECT DRIVE
6 3 16729 BLADE, 25.000 X 4.000 X 0.500, NO LIFT
7830113 BOLT, HH, 5/8-11X2, GRD 8, ZINC
8116768 DECAL KIT, 72HD/0
91 16525 HOSE WHIP ASSEMBLY, -6 ORFS, FEMALE SWIVEL COUPLINGS, 0.375 X 130.000 HOSE
10 2 15587 HOSE WHIP ASSEMBLY, -12 ORFS, FEMALE SWIVEL COUPLINGS, 0.750 X 114.000 HOSE
11 1 16760 PLATE, ACCESS, 2 HOLE, 3.750 x 6.000
12 1 15418 PLATE, STAUFF, 3 HOLE COVER, 1.25 X 5.875
13 1 16761 WELDMENT, FRAME, 72 HD/XP/O
14 1 16757 WELDMENT, HOOD, 72/78 HD/XP/0
15 1 16501 ADAPTER, 90 DEG, 1/4MBSPP, #6 MOFS
16 1 15408 ADAPTER, STRAIGHT, #6 MORFS, #8 MORB
17 2 15406 ADAPTER, STRAIGHT, #12 MORF, #10 MORB
18 215689 ADAPTER, STRAIGHT, #12 MORFS MALE, #16 MORB
19 1 16421 BEARING HOUSING, SAE “C” MOUNT, 2.625 SHAFT, 7.750 SPINDLE OUTPUT
20 1 15401 CLAMP, BODY, TWO PIECE, 30-30-18, THREE HOSE, BLACK
21 1 15078 COUPLER, FLAT FACED, 1/2 FEMALE, 7/8-14, O-RING BOSS
22 1 15079 COUPLER, FLAT FACED, 1/2 MALE, 7/8-14, O-RING BOSS
23 1 15414 COUPLER, FLAT FACED, 3/8 FEMALE, 3/4-16, O-RING BOSS
24 1 16562 DUST CAP, 0.375 COUPLER, FEMALE
25 1 16563 DUST CAP, 0.500 COUPLER, FEMALE
26 1 16564 DUST CAP, 0.500 COUPLER, MALE
27 1 16764 MOTOR, 150CC, A3 SAE C MOUNT, WITH VALVES
28 4 30123 BOLT, HH, FLANGED, 1/2-13 X 1 1/2, GRD 5, ZINC
29 2 30044 BOLT, HH, 3/8-16 X 3, GRD 5, ZINC
30 6 30058 BOLT, HH, FLANGED, SERRATED, 3/8-16 X 1, GRD 5, ZINC
31 930067 NUT, NYLOCK, 5/8-18,GRD 8 ZINC
32 4 15381 WASHER, NORD-LOCK, 0.500 X 1.000 OD, ZINC
33 9 15380 WASHER, NORD-LOCK, 0.625 X 1.210 OD, ZINC
34 4 15685 WASHER, RUBBER SEAL, 0.812 OD X 0.355 ID X .094

16
877-390-9857 | brushwolf.com
PARTS: 72XP/O
DETAIL A
DETAIL B
A
B
11
13
15
18
19
23
22
21
4X
30
4X
31 33 9X
34 4X
10
9
6
8
12
14
16
17
27
19
20
26
25
24
28 32
30
1
7 4
5
2
3
3X
8X
3X
3X
3X
29

17
ONLY USE GENUINE OEM PARTS. ORDER PARTS FROM BRUSH WOLF AT 877-390-9857
ITEM ITEM
QTY
PART
NUMBER DESCRIPTION
1 3 15066 BOLT, D-BOLT, 1 1/8-12, BW
2 3 15148 NUT, TOP LOCK, 1 1/8-12, GRADE C, PLAIN
3 3 30089 WASHER, FLAT, 1 1/8, F436, ZINC
48 30085 WASHER, FLAT, 5/8, F436, ZINC
5 1 16726 WELDMENT, 3 BLADE CARRIER, DIRECT DRIVE
6 3 16729 BLADE, 25.000 X 4.000 X 0.500, NO LIFT
7830113 BOLT, HH, 5/8-11X2, GRD 8, ZINC
81 16767 DECAL KIT, 72XP/0
91 16525 HOSE WHIP ASSEMBLY, -6 ORFS, FEMALE SWIVEL COUPLINGS, 0.375 X 130.000 HOSE
10 2 15587 HOSE WHIP ASSEMBLY, -12 ORFS, FEMALE SWIVEL COUPLINGS, 0.750 X 114.000 HOSE
11 1 16760 PLATE, ACCESS, 2 HOLE, 3.750 x 6.000
12 1 15418 PLATE, STAUFF, 3 HOLE COVER, 1.25 X 5.875
13 1 16761 WELDMENT, FRAME, 72 HD/XP/O
14 1 16757 WELDMENT, HOOD, 72/78 HD/XP/0
15 1 16501 ADAPTER, 90 DEG, 1/4MBSPP, #6 MOFS
16 1 15408 ADAPTER, STRAIGHT, #6 MORFS, #8 MORB
17 2 15405 ADAPTER, STRAIGHT, #12 MORF, #12 MORB
18 215689 ADAPTER, STRAIGHT, #12 MORFS MALE, #16 MORB
19 1 16421 BEARING HOUSING, SAE “C” MOUNT, 2.625 SHAFT, 7.750 SPINDLE OUTPUT
20 1 15401 CLAMP, BODY, TWO PIECE, 30-30-18, THREE HOSE, BLACK
21 1 15414 COUPLER, FLAT FACED, 3/8 FEMALE, 3/4-16, O-RING BOSS
22 1 15114 COUPLER, FLAT FACED, 5/8 FEMALE, 1 1/6-12, O-RING BOSS
23 1 15115 COUPLER,FLAT FACED, 5/8 MALE, 1 1/6-12, O-RING BOSS
24 1 16562 DUST CAP, 0.375 COUPLER, FEMALE
25 1 16565 DUST CAP, 0.625 COUPLER, FEMALE
26 1 16566 DUST CAP, 0.625 COUPLER, MALE
27 1 16763 MOTOR, 175CC, A3 SAE C MOUNT, WITH VALVES
28 4 30123 BOLT, HH, FLANGED, 1/2-13 X 1 1/2, GRD 5, ZINC
29 2 30044 BOLT, HH, 3/8-16 X 3, GRD 5, ZINC
30 6 30058 BOLT, HH, FLANGED, SERRATED, 3/8-16 X 1, GRD 5, ZINC
31 930067 NUT, NYLOCK, 5/8-18,GRD 8 ZINC
32 4 15381 WASHER, NORD-LOCK, 0.500 X 1.000 OD, ZINC
33 9 15380 WASHER, NORD-LOCK, 0.625 X 1.210 OD, ZINC
34 4 15685 WASHER, RUBBER SEAL, 0.812 OD X 0.355 ID X .094

18
877-390-9857 | brushwolf.com
PARTS: 78HD/O
DETAIL A
DETAIL B
A
B
1
2
8
10
11
12
13
14
15
16
24
17
23
18
19
22
21
20
28 32 4X
29
30
4X
30
31 34 9X
33
4X
26
27
25
9
3
67
4
5
8X
3X
4X
3X
3X