AcrEase MR44BE User manual

1
12/20
44” ROUGH CUT
WITH ELECTRIC CLUTCH BLADE ENGAGEMENT
OWNER’S MANUAL
With Assembly Instructions
For Models: MR44BE
KUNZ ENGINEERING, INC. / MENDOTA, IL 61342 / PH [phone]

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TABLE OF CONTENTS
SAFETY INTRODUCTION…………………………………………………………………………….…2
Safety Alert Symbol ……………………………………………………………………………….…... 2
Safety Information …………………………………………………………………………………..…. 3
Safety Signs and Locations ……………………………………………………………………….….. 4
ASSEMBLY INSTRUCTIONS ………………………………………………………………………..... 5
Items Included ……………………………………………………………………………………….…5
Assembly of Rear Wheels and Carrier Arms ……………………………………………………….. 5
Installation of Cross Brace Tubes and Height Adjust Assy.…………………………………….…. 6
Installation of Tongue Assembly ………………………………………………………………….…..8
OPERATION AND ADJUSTMENTS ……………………………………………………………….…. 9
Intended Use …………………………………………………………………………………………... 9
Tongue Configurations and Adjustments …………………………………………………….…….. 9
Adjusting Cutting Height …………………………………………………………………………….... 10
Starting Engine ……………………………………………………………………………………….... 12
Shutting Off Mower …………………………………………………………………………………..... 13
Mower Operation …………………………………………………………………………………….....13
MAINTENANCE ……………………………………………………………………………………….….14
Drive Belt Removal and Tension ………………………………………………………………….…. 14
Mower Blade Removal, Balancing & Installation ……………………………………………….….. 15
Lubrication ……………………………………………………………………………………………....16
Engine Maintenance ………………………………………………………………………………..…. 16
Fuse Location …………………………………………………………………………………………...16
Storage ………………………………………………………………………………………………..…16
EPA Evaporative Components ………………………………………………………………………..16
SPECIFICATIONS …………………………………………………………………………………….….17
Engine …………………………………………………………………………………………….…….. 17
Mower …………………………………………………………………………………………..………..17
Weight & Dimensions ………………………………………………………………………………..... 17
SERVICE PARTS …………………………………………………………………………………………18
Parts List ………………………………………………………………………………………………... 18
Parts Drawing ……………………………………………………………………………………….…. 20
OPTIONAL EQUIPMENT ………………………………………………………………………………. 21
Wetlands Kit ……………………………………………………………………………………………. 21
Electric Lift Kit ……………………………………………………………………………………….…. 22
Floatation Kit ………………………………………………………………………………………..….. 23
WARRANTY STATEMENT ………………………………………………………………………….…. 24

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SAFETY INTRODUCTION
READ AND UNDERSTAND OWNER’S MANUAL BEFORE USING THIS MACHINE.
All operators of this equipment must read and completely understand all safety information,
operating instructions and maintenance. Failure to properly operate and maintain this
mower could result in serious injury or death to the operator or bystanders.
Your safety, and the safety of others, is very important. To help you make informed
decisions about safety, we have provided operating procedures and other information on
labels and in this manual. This information alerts you to potential hazards that could hurt
you or others.
This safety alert symbol is used to indicate safety instructions. Follow these
instructions to avoid personal injury and/or property damage. Read and follow all
instructions in this manual and the included engine manual.
You will find important safety information in a variety of forms, including:
Safety Labels –on the mower.
Safety Messages –preceded by a safety alert symbol and one of three signal
words: DANGER, WARNING, or CAUTION.
These signal words mean:
Indicates an imminently hazardous situation that, if not avoided, will result in death or
serious injury. This signal word is to be limited to the most extreme situations
typically for machine components which, for functional purposes, cannot be guarded.
Indicates a potentially hazardous situation that, if not avoided, could result in death or
serious injury, and includes hazards that are exposed when guards are removed. It
may also be used to alert against unsafe practices.
Indicates a potentially hazardous situation that, if not avoided, may result in minor or
moderate injury. It may also be used to alert against unsafe practices.
This entire manual is filled with important safety information. Please read it
carefully.
If you have any questions or concerns regarding the information in this owner’s
manual please contact Kunz Engineering at 815-539-6954.

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IMPORTANT SAFETY INFORMATION
Do not allow anyone to operate this equipment who has not fully read and
comprehended the safety manual and who has not been properly trained in the safe
operation of the equipment.
Operator should be familiar with all functions of the unit.
Keep hands, feet, hair and clothing away from moving parts.
Remove all objects from the work area that might be picked up and thrown by the
blades.
Do not mow when children and others are around.
Keep all safety shields and deflectors in place during operation.
Shut off the engine and allow the mower blades to come to a complete stop before
making any adjustments to the mower.
Shut off engine before disconnecting the wing mower from the tow vehicle or
attempting to move the wing mower by hand.
Never carry children or passengers.
Do not allow children to operate this machine.
Follow all safety precautions outlined by the manufacturer of the tow vehicle being
used to pull this product.
This entire manual is filled with important safety information. Please read it
carefully.

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SAFETY SIGNS AND LOCATIONS
Clean or Replace Any Safety Signs That Are not Readable or Damaged
Replacement decals can be purchased from your local dealer or
Kunz Engineering Inc.
Mendota, IL 61342
[phone]
275003 –Danger
Decal, Cut Hand & Foot
275007 –Warning
Decal, Belt Sheild
275002 –Warning
Decal, General
Serial # and Model #
Decal

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ASSEMBLY INSTRUCTIONS
Read the complete assembly instructions before starting the assembly.
You should have:
- one mower deck assembly
- two carrier arm assemblies
- two rear tire assemblies
- one front cross brace tube and one rear cross brace tube with height adjust assy.
- one ATV tongue assembly
A. ASSEMBLY OF REAR WHEELS AND CARRIER ARMS
1. Set the mower deck assembly on wood blocks so that it is suspended off the ground.
Note: The operator controls are on the front of the deck. (Left and right are determined by
looking in the direction of travel or by standing at the rear of the deck assembly looking
forward.)
2. Install the rear tire assemblies on the carrier arm assemblies. Remove the hex nut and lock
washer from the rear tire assembly and install the 5/8”x7-1/2” tire axle bolt through the hole in
the carrier arm assembly. See figure 1. Secure assembly with the lock washer and hex nut
provided on the rear tire assembly. The rear tires should be offset to the outside of the deck
assembly on both sides. See figure 2.
Figure 1: Rear Tire Assembly Installation
Flat Washer
Rear Tire
Carrier Arm
Assembly
Hex Nut and
Lock Washer
Cup Washer
Bolt
Spanner
Tube

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3. Install the two carrier arm assemblies in the pivot arms, which are located on the mower deck
assembly. Place the assembly so that the castered tires are on the front and the fixed tires are
on the back. See figure 2. Secure with 1/2" x 3-1/2" hex head bolts and lock nuts provided on
the pivot arms.
Note: Tighten 1/2” x 3-1/2” hex head bolts until just snug. This area needs to pivot when
adjusting the height. Under tightening can result in excessive wear and flexing. Over
tightening will make adjusting the cutting height very difficult.
Figure 2: Carrier Arm Installation
B. INSTALLATION OF CROSS BRACE TUBES AND HEIGHT ADJUST ASSY.
For this section, if your mower was purchased with an Electric Lift Kit (Part #003912), refer to
Section C of the Electric Lift Kit Owner’s Manual.
1. Remove the 1/2” x 3” hex head bolts, lock washers and nuts that are located on the top of each
carrier arm (four per carrier arm). The removed hardware will be used in step 2.
2. Install the cross brace tubes on the carrier arms with the 1/2” x 3” hex head bolts, lock washers
and nuts. Only hand tighten the hardware for this step. The support that has the height adjust
assy. fastened to it needs to be placed on the rear location. Orientate the support such that
the height adjust assy. hangs towards the engine. See figure 3.
3. Remove the 1/2” x 1” bolt and lock nut from the lower deck mount. Manually turn the screw
down towards the deck until the screw mounting flat hole lines up with the lower deck mount
hole. After achieving alignment, attach the screw mounting flat with the 1/2” x 1” hex head bolt
and secure the bolt with the provided lock nut. Do not over-tighten. This location must be able
to pivot. See figure 4.
Rear Tire Assy.
(Attach on outside for
both left and right sides)
Pivot Arm
Front (Rubber
Flap Side)
Carrier Arm
Assy.
1/2” x 3-1/2” Bolt

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Figure 3: Cross Brace Tube Installation
Figure 4: Height Adjust Assy. Installation
4. Turn the crank on the height adjust assy. and raise the mower to its highest position. At this
time securely tighten the 1/2” x 3” hex head bolts, lock washers and nuts holding the cross
brace tubes in place. This step insures that proper alignment of the carrier arms has been
achieved.
Height Adjust Assy.
Cross Brace
Tube
1/2” x 3” Bolt
Screw Mounting
Flat
Height Adjust
Assy.
1/2” x 1” Bolt
Lower Deck
Mount
Screw

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C. INSTALLATION OF TONGUE ASSEMBLY
1. The tongue can be installed either on the left or right carrier arm assembly depending on how
the tow-behind mower will be towed. See figure 5. Secure the hitch pivot on the chosen
carrier arm assembly with the 1/2” x 3-1/2” hex head bolt, lock washer, and nut provided.
2. Install the tongue into the hitch pivot and secure by placing the provided 5/16” wire lock pins on
each side of the hitch pivot.
Note: To help prevent any unwanted pin removal caused by oncoming debris install the 5/16”
wire lock pins with the wire lock section back from the direction of travel. See Figure 6.
Figure 5: Assembly of the Tongue and Hitch Pivot
Hitch Pivot –Attach to
Either Left or Right
Carrier Arm Assy.
Tongue
Carrier Arm
Assy.
Direct Behind Position
Offset Position

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Figure 6: ATV Tongue Assembly
OPERATIONS AND ADJUSTMENTS
This safety alert symbol is used to indicate safety instructions. Follow
these instructions to avoid personal injury and/or property damage.
Read and follow all instructions in this manual and the attached engine
manual.
Do not allow anyone to operate this equipment who has not fully read and
comprehended the safety manual and who has not been properly trained in the safe
operation of the equipment.
Operator should be familiar with all functions of the unit.
A. INTENDED USE
This mower is intended for use behind an ATV, UTV (utility vehicle / side-by-side) or small tractor
to cut grass, weeds, brush and saplings up to 2”in diameter.
B. TONGUE CONFIGURATIONS AND ADJUSTMENTS
Shut off the engine and allow the mower blades to come to a complete stop before
adjusting the tongue.
The hitching system is designed so that the rough cut mower can be pulled directly behind a tow
vehicle or offset to the left or right. See Figure 7.
Wire Lock Section of
Wire Lock Pin
(Placed Back From
Direction of Travel)
5/16” Wire
Lock Pins
Direction of Travel
Screw Pin Shackle
Clevis
Tongue
Shift Tongue Left or Right
Between Holes

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Note: When pulling the mower directly behind, the hitch pivot should be fastened on the right
carrier arm for maximum maneuverability. See Figure 5. When pulling the mower in
the offset position the hitch pivot can be fastened on either the right or left carrier arm.
See Figure 5.
The tongue is equipped with a screw pin shackle clevis to provide movement in all directions on
rough, uneven ground. To prevent loss of the screw pin due to vibration or debris, place the
screw pin through the tow vehicle hitch and clevis and turn the screw pin until tight. Use of pliers
or a similar type of tool will be necessary to fully tighten the shackle pin.
Failure to properly tighten the shackle pin could result in the mower separating from
the tow vehicle.
The tongue is designed to adjust from left to right within the hitch pivot. This allows the mowers
position to be varied behind the tow vehicle. This is accomplished by pulling the 5/16” wire lock
pins out and choosing two other hole locations on the tongue. See Figure 6.
Figure 7: Rough Cut Tow Behind Towing Suggestions
B. ADJUSTING CUTTING HEIGHT
Shut off all engines and allow the mower blades to come to a complete stop before
adjusting the cutting height.
The cutting height can be adjusted in a range from 2.0" to 8.0". This is accomplished by turning
the height adjust crank located at the back of the mower. See Figure 8.Turn the crank clockwise
to raise the mower cutting height and counter-clockwise to lower the mower cutting height.
Shut off tow vehicle engine and allow mower blades to stop completely before
attempting to measure the cutting height.
Offset
Directly Behind

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Adjust the mower as follows:
1. Pull the mower on to a smooth, level surface.
2. The desired cutting height can be determined by measuring the distance from the ground to
the outside lower edge of the mower deck and adding 1-5/16”. The mower blade cutting edge
is 1-5/16” above the outside lower edge of the mower deck.
Note: If the height adjust crank does not turn easily, the pivot bolts holding the carrier arm
assemblies and height adjust screw may be too tight. Loosen the pivot bolts slightly to
allow easier pivoting. Care should be taken not to loosen too much or excess wear and
flexing may occur. Greasing the threads on the height adjust screw may also allow
greater ease in adjustment.
Note: After setting the initial cutting height, quick field adjustments can be completed by
counting crank turns. Roughly 8 turns will equal 1” of vertical movement.
Figure 8: Adjusting Rough Cut Mower Cutting Height
The adjustment crank may unturn due to vibration. This will allow the mower’s cutting height to
change. The crank can be secured by folding it down between the adjustment nut tube and the
height adjust support. See Figure 9.
Measure This Distance
and Add 1-5/16” to get
Cutting Height
Cutting Height
1-5/16”
Smooth Surface
Lower Edge of
Deck
Mower Blade
Adjustment Crank: Roughly 8
turns equals 1.0”

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Figure 9: Securing Crank While Not In Use
C. STARTING ENGINE
Set parking brake on tow vehicle.
Attach mower tongue to tow vehicle.
Do not start rough cut mower unless it is attached to the tow vehicle.
Turn on the fuel shut off valve (red colored rotating knob) located inline on the fuel hose. The off
position on the valve is when the red handle lines up with the “O” symbol.
Set the choke to the desired position.
Set the throttle at approximately half throttle.
Start engine and allow engine to warm up.
Set engine speed at about half throttle and engage the mower blades clutch by pulling outward on
the PTO switch. (The PTO switch is located at the front of the mower deck on the control panel.)
Note: To help extend the life of the clutch the engine rpm should be placed as low as possible
before clutch engagement. If the engine should stall during clutch engagement raise
the engine rpm until clutch engagement is possible.
If the mower’s engine dies while in use, remove the rough cut mower from the uncut
area before attempting to engage the clutch. Inspect the blades for any obstructions
that may prevent blade engagement. Failure to follow these instructions may result
in premature clutch and belt failure or a fire.
Adjust engine speed to full throttle.
Adjustment Crank
Height Adjust Support
Adjustment Nut Tube

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D. SHUTTING OFF ROUGH CUT MOWER
Shift to neutral and set the parking brake before dismounting the tow vehicle.
Slow the engine speed down and disengage the clutch by pushing inward on the PTO switch.
Allow engine to cool down for a short time before moving the ignition switch to the off position.
Turn off the fuel shut off valve (red colored rotating knob) located inline on the fuel hose. The off
position on the valve is when the red handle lines up with the “O” symbol.
E. MOWER OPERATION
Keep hands, feet, hair and clothing away from moving parts.
Clean or replace any safety signs that are not readable or damaged.
Remove all objects from the work area that might be picked up and thrown by the
blades.
Do not mow when children and others are around.
Do not fill fuel tank while engine is running or hot.
Keep all safety shields and deflectors in place during operation.
Remove grass build up from under safety shields before each use. Do not remove
safety shields while engine is running. Dry grass build up around belts and sheaves
can cause fires.
Shut off engine before disconnecting the mower from the tow vehicle or attempting to
move the wing mower by hand.
Never carry children or passengers.
Do not allow children to operate this machine.
Slow down and watch the ends of the mower when making turns so objects are not
struck and/or run over.
Look down, to the sides, and behind before and while backing to avoid backing over
something or someone. Care should also be taken while backing so that the wing
mower or mowers do not jackknife and damage hitches.

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Stop the mower blades on the mower if the tow vehicle becomes stuck or stops going
forward because of loss of traction. Shut off the engine on the mower before
attempting to push or pull the tow vehicle.
Inspect the ATV Tongue Assembly and tow vehicle hitch before each use. If any
parts of the tongue or hitch look damaged or severely worn, discontinue use of the
mower until the damaged or worn parts are replaced.
Engine exhaust contains carbon monoxide. Do not run engine indoors or in a small
confined area where dangerous carbon monoxide fumes can collect.
Wear hearing protection when operating this mower.
Engine components and exhaust can develop excessive heat. Keep the mower
clean of debris and other flammable material to avoid fires.
Follow all safety precautions outlined by the manufacturer of the tow vehicle being
used to pull this product.
Listen to the rough cut mower engine while mowing. The engine should run free and not work too
hard. Working the engine too hard will cause overheating and premature failure.
If the mower’s engine dies while in use, remove the rough cut mower from the uncut
area before attempting to engage the clutch. Inspect the blades for any obstructions
that may prevent blade engagement. Failure to follow these instructions may result
in premature belt failure or a fire.
Do not allow material to build up on the air inlet to the engine cooling system. Special care should
be taken to make sure the engine is getting enough inlet air. Do not allow the engine cooling fins
under the shroud to be blocked. If air flow over the engine is restricted, the engine could
overheat.
MAINTENANCE
A. DRIVE BELT REMOVAL AND TENSION –Refer to Figure 10
Shut off engine and allow mower blades to stop turning before making any
adjustments or repairs.
Remove the safety shields.
Loosen the nuts on the spring-loaded idler; adjust bolt until the belt can be slipped off the idler and
drive sheaves.
Slip the belt down under the drive sheave and off the blade spindle sheaves.

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Install the new belt and then adjust the tension as follows: See Figure 10.
Figure 10: Belt Pattern, Spring Adjustment, and Brake Adjustment
Adjust the nuts on the spring-loaded idler adjuster bolt until the length of the spring is between 2-
1/2” and 2-9/16”. This is the initial belt break in spring length. When the belt is broken in after
several hours of mowing, the running spring length should be between 2-3/4” and 3-1/4”. For
maximum belt life, periodic checks every 3-4 hours should be done to make sure the spring length
has not exceeded the recommended running length.
Note: Failure to periodically adjust the belt tension will result in severe belt wear and
premature belt failure.
B. MOWER BLADE REMOVAL, BALANCING & INSTALLATION
Sharp blades can cause bodily injury if not handled properly.
When removing the blade, it is recommended that a block of wood be placed between the blade
and the underside of the mower deck. This will allow the removal of the blade without the need to
hold the blade by hand.
Initial Spring Length (New Belt):
2-1/2” to 2-9/16”
Running Spring Length:
2-3/4” to 3-1/4”
Engine/Clutch
Front
Only Include Spring
in Measurement

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Always balance the mower blades each time they are sharpened.
Out of balance mower blades cause excess vibrations which lead to premature bearing failures,
bolts coming loose, and overall deterioration of the mower.
Always properly tighten the blade bolts to the specified torque. Failure to do so can
lead to unwanted loosening of the blade and damage to the blade holding saddle.
The Model MR44BE uses the Kunz Engineering Part # (202141) blade bolt. This particular hex
head bolt is a 3/4” – 16NF x 1-1/4” long, grade 5 and its proper torque is 300 ft-lbs.
To ease in the blade installation process, use the same block of wood and method used during
the removal of the blades.
C. LUBRICATION
There are three lubrication points on the rough cut mower -- one spring-loaded idler pivot and
two caster wheel pivots. Lubricate at approximately 10 hr. intervals or more often as required in
dusty conditions.
D. ENGINE MAINTENANCE
Refer to the engine manual provided in the owner’s manual packet.
E. FUSE LOCATION
These particular mowers come equipped with a 10 AMP mini blade type fuse. The fuse is located
behind the ignition switch/control panel in a black rubber inline fuse holder.
F. STORAGE
Turn off the fuel shut off valve (red colored rotating knob) located inline on the fuel hose. The off
position on the valve is when the red handle lines up with the “O” symbol. If the mower is stored
outside, the engine should be covered to prevent water from getting inside the engine during
heavy rainstorms. See the Engine Manual for additional information.
G. EPA EVAPORATIVE COMPONENTS
This mower has been designed and built to meet all current EPA regulations. Any modification to
the fuel tank, fuel lines, vapor hose, fuel cap, roll-over / fuel vapor valve, carbon canister
(California Only) and hose clamps are prohibited. Replacement evaporative components should
be purchased from Kunz Engineering. Any questions about EPA regulations or evaporative
components can be directed to Kunz Engineering Inc. at 815-539-6954.

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ACREASE ROUGH CUT MOWER SPECIFICATIONS
Model
MR44BE
ENGINE:
Engine Make Briggs & Stratton
Engine Model Commercial Turf
Cylinders 2
Cycles 4
Crankshaft Vertical
Engine HP 23
Bore 3.12"
Stroke 2.89"
Displacement 44.2 cubic inches
Oil Capacity 2 U.S. qt
Crankshaft Dia. 1.0"
Key Slot 1/4"
Crankshaft Length 3.15"
Threaded Hole in End of Crankshaft 7/16-20
Engine Mounting Bolts 5/16-18x1.50 Through Bolt
Starter Electric
Choke Manual
MOWER:
Fuel Tank 3 Gal.
Effective Cutting Width 44"
Deck Construction 8 ga. Welded steel
Cutting Height 2" to 8"
Height Adjustment Single Crank
Rear Wheels (Fixed) (4 ply Turf Pnuematic) Two 15/600 x 6
Front Wheels (Caster) (4 ply Turf Pnuematic) Two 5.30/4.50 x 6
Blade Dia. 2-23"
Engine Speed, Blades Running 3500 RPM
CLUTCH TYPE Electric Clutch
DIMENSIONS
Length 95.5"
Width 46.5"
Height 29"
Weight 530 lbs.
HITCH
Hitch Type ATV Tongue
TOUCH-UP PAINT COLOR Pewter Gray, Krylon #1606

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ACREASE ROUGH CUT MOWER PARTS LIST
Item Part # Description Quantity
1202141 Blade Bolt, .75"-16UNF x 1.25" 2
2214030 Cup Washer 6
3216002 Wire Lock Pin, .31" x 2.50" 2
4216009 Screw Pin Shackle Clevis 1
5222005 Worm Drive Hose Clamp (7-7/8" to 9-1/8" Clamping Dia.) 2
6222012 Single Split Collar (1" I.D. x 1/2: Thick) 2
7225005 Compression Spring, 4-1/2"L x 1-3/32" O.D. x .125" Wire dia. 1
8226012 Offset Wheel Assy. (15/600 x 6, 4 Ply Turf) 2
8226014 Offset Wheel Assy. (15/600 x 6, Urethane Foam-Flatproof) Optional
9226013 Centered Wheel Assy. (5.30/4.50 x 6, 4 Ply Stud) 2
9226015 Centered Wheel Assy. (5.30/4.50 x 6, Urethane Foam-Flatproof) Optional
10 238007 "V" Belt, .62" x 77" O.C. (B74K) 1
11 241001 Flat Idler, 4" O.D. x 3/8" Hole 1
12 243010 Plastic Bearing (1-3/8" O.D. x 1.00" I.D., Flange, Nylon) 4
13 243015 Precision Sealed Wheel Bearings (2" O.D. x 1" I.D.) 8
14 258018 Electric Clutch 1
15 258023 Spindle Assy. 2
900075 Spindle Shaft (1)
900160 Housing Assy. (With Two Bearings) (1)
243006 Bearing (6206 w/ Trash Guard Seals) (2)
600271 Bearing Spacer (3.33" Long) (1)
241011 Sheave, (5.56" Dia., B-Section) (1)
16 259008 Offset Mower Blade, 2-1/2" Wide, 23" Long, 3/4" Hole 2
17 260004 Roll-Over / Fuel Vapor Valve (Includes Gromet) 1
18 264000 Solenoid 1
19 264010 Ignition Switch 1
20 264003 Hour/Tack Meter Optional
21 269010 Choke Control, 27" 1
22 269009 Throttle Control, 27" 1
23 275001 Control Panel Decal, Starting Instructions 1
23 275002 Warning Decal General 1
23 275003 Danger Decal, Cut Finger 2
23 275007 Warning Decal, Belt Sheild 2
23 275011 Clutch Engagement Decal 1
23 275019 Name Decal,Kunz 1
23 275021 Name Decal, AcrEase 1
23 275024 Name Decal, 44" Rough Cut 1
24 277002 Rubber Gromet 6
25 277035 Gas Cap - Audible Click/Tethered, Non-Venting 1
26 277036 Carbon Canister - 300cc (California Only) 1
27 277040 Fuel Tank, 3 Gal., 3-Layer EPA Certified 1
28 600146 Crank Arm 2
29 600185 Top Long Support 1
30 600186 Top Short Support 1
31 600198 Clutch Stop 1
32 600252 Flap Retainer Strip 1