For Models: MR55T, MR55B-17.5HP, MR55B-22-23HP & MR55K
KUNZ ENGINEERING, INC. 42 / PH (815) 539-6954
/ MENDOTA, IL 613
MR55B
1/09
SAFETY INTRODUCTION
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.
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:
DANGER: 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.
WARNING: 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.
CAUTION: 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.
1
IMPORTANT SAFETY INFORMATION
WARNING: 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.
WARNING: Operator should be familiar with all functions of the unit.
DANGER: Keep hands, feet, hair and clothing away from moving parts.
WARNING: Remove all objects from the work area that might be picked up and thrown by
the blades.
WARNING: Do not mow when children and others are around.
WARNING: Keep all safety shields and deflectors in place during operation.
WARNING: Shut off the engine and allow the mower blades to come to a complete stop
before making any adjustments to the mower.
WARNING: Shut off engine before disconnecting the mower from the tow vehicle or
attempting to move the mower by hand.
WARNING: Never carry children or passengers.
WARNING: Do not allow children to operate this machine.
This entire manual is filled with important safety information. Please read it
carefully.
2
275002 – Warning
Decal, General
SAFETY SIGNS AND LOCATIONS
275003 – Danger
Decal, Cut Hand & Foot
Clean or R
Replacement decals can be purchased from your local dealer or
eplace Any Safety Signs That Are not Readable or Damaged
Kunz Engineering Inc.
Mendota, IL
61342
(815) 539-6954
275007 – Warning
Decal, Belt Sheild
Serial # and Model #
Decal
3
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 ATV tongue assembly
A. ASSEMBLY OF MOWER WHEELS
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.
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. Mount the height adjust screw on the deck assembly in the hole provided.
Secure with the 1/2”x1” hex head bolt and lock nut provided on the height adjust screw.
Note: Tighten 1/2” x 3-1/2” and 1/2” x 1” 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.
B. INSTALLATION OF TONGUE ASSEMBLY
1. The tongue can be installed either on the left or right caster assembly depending on how the
tow-behind mower will be towed. See figure 2. Secure the hitch pivot on the chosen caster
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 3.
4
Hex Nut and
Lock Washer
Ca
sembly
As
Cup Washer
Figure 1: Rear Tire Assembly Installation
Rear Tire rrier Arm
Bolt
Flat Washer
Hitch Pivot – Attach to
Either Left or Right
Carrier Arm Assy.
Carrier Arm
A
ssy.
Tongue
Rear Tire As
(Attach on outside for
both left and right sides)
sy.
Height Adjust
Screw
Front (Rubber
Flap Side)
Pivot Arm
Figure 2: Assembly of Carrier Arm Assy., Hitch Pivot, and Tongue
Direct Behind Position Offset Position
5
Direction of Travel Screw Pin Shackle
Clevis
Shift Tong
Between Hol
ue Left or Right
es
5/16” Wire
Lock Pins
Tongue
Wn of
ire Lock Sectio
W Pin
ire Lock
(Placed Back From
Direction of Trav
el)
Figure 3: ATV Tongue Assembly
TIONS AND ADJUSTMENTSOPERA
This safety alert symbol is used to
these instructions to avoid personal
Read and follo
w all instructions in this manual and the attached engine
manual.
WARNING
: 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.
WARNING be familiar wit
: Operator shouldh all functions of the unit.
A. TOE CONFIGURATIONS AND
NGU ADJUSTMENTS
WARN engine and allow the moweplete stop
ING: Shut off ther blades to come to a com
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 4.
Note: When pulling the mower directly behind, the hitch pivot should be fastened on the right
carrier arm for maximum maneuverability. See Figure 2. When pulling the mower in
the offset position the hitch pivot can be fastened on either the right or left carrier arm.
See Figure 2.
indicate safety instructions. Follow
injury and/or property damage.
6
The tongue is equipped with a screw pin shackle clevis to provide movement in all directions on
q
rough uneven ground. To prevration or debris, place the screw
ent loss of the screw pin due to vib
pin through the tow vehicle hitch and clevis and turn the screw pin until snug.
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 3.
OffsDirectly Behind et
Figure 4: Rough Cut Tow Behind Towing Suggestions
B. ADJUSTING CUTTING HEIGHT
W
ARNING: Shut off the engine and allow the mower blades to come to a complete stop
The cutting height can be adjusted in a range from 2.0" to 8.0". This is accomplished by turning
the height adjust cranks on both sides of the mower. See Figure 5. Turn the cranks clockwise to
raise the mower cutting height and counter-clockwise to lower the mower cutting height.
DANGER: Shut off tow vehicle engine and allow mower blades to stop completely before
attempting to measure the cutting height.
Adjust the mower as follows:
1. Pull the mower o
n to a smooth, level surface.
2. Adjust the mower evenly from side to side by measuring to the ground from the lower edge of
the mower deck. The desired h
eight will be the distance from the ground to the outside lower
edge of the mower deck plus 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 cranks do 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 may also allow greater ease in adjustment.
Note: After leveling mower deck, quick field adjustment can be completed by counting crank
turns. Roughly 6 turns will equal 1” of vertical movement.
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
upper pivot support. See Figure 6.
Adjustment Nut Tube
Upper Pivot Support
Adjustment Crank
Carrier Arm
Figure 6: Securing Crank While Not In Use
8
C. STAR
ING ENGINE
T
WARNING
: Set parking brake on tow vehicle.
Attach mower tongue to tow vehicle.
WARNING: Do not start rough cut mower unless it is attached to the tow vehicle.
Turon the underside of the gas tank.
n on fuel shut off valve which is located
Set
the choke to the desired position.
Set the th
rottle at approximately half throttle.
Start engine and allow engine to warm up.
Set enginetch handle. (The clutch
speed at about half throttle and engage mower blades clu
handle is located at the front of the mower under the engine.)
Note: Some belt squealing may occur on engagement. This is normal for a manual clutch
engagement design.
CAUTION: If the rough cut mower from the
mower’s engine dies while in use, remove 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.
D. SHUTTING OFF ROUGH CUT MOWER
WARNING: Shift to neutral and set the parking brake before dismounting the tow vehicle.
Slow the engine speed down and disengage the clutch handle.
Allow engine to cool down for a short time before moving the ignition switch to the off position.
Turn off fuel shut off valve which is located on the underside of the gas tank.
. MOWER OPERATION
E
DANGER: Keep hands, feet, hair and clothing away from moving parts.
CAUTION: Cle
an or replace any safety signs that are not readable or damaged.
9
WARNING: Remove all objects from the work area that might be picked up and thrown by
the blades.
WARNING: Do not mow when children and others are around.
WARNING: Do not fill fuel tank while engine is running or hot.
WARNING: Keep all safety shields and deflectors in place during operation.
CAUTION: 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.
WARNING: Shut off engine before disconnecting the m
ower from the tow vehicle or
attempting to move the wing mower by hand.
W children or passengers.
ARNING: Never carry
WARNING: Do not allow children to operate this machine.
CAUTION: Slow down and watch the ends of the mower when making turns so objects
are not struck and/or run over.
WARNING: Look down, to t
he 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 jack
knife and damage hitches.
WARNING: 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.
Listen to the rough cut mower engine while mowing. The engine should run free and not work t
hard.
Working the engine too hard will cause overheating and premature failure.
oo
CAUTION: If the mower’s engine dies while in use, remove the rough cut mower from the
uncut area befor
e 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
t
under
overhe
he shroud to be blocked. If air flow over the engine is restricted, the engine could
a
t.
10
F. DRIVE
BELT REMOVAL AND TENSION – Refer to Figure 7
WARNING: Shut off engine and allow mower blades to stop turning before m
aking any
adjustments or repairs.
Remov
e the safety shields.
Loosen the nuts on the spring-loaded idler; adjust bolt until the belt can be slipped off the idler and
h
drive s
eaves.
Slip the belt down under the drive sheave and off the blade spindle sheaves.
Install the new belt and then adjust the tension as follows: See Figure 7. Take special care to
make ser pulley.
ure that the belt is placed between the brake stud and the idl
With thf
the sprir models with 3” long spring) or 2-3/8” and 2-1/2” (For
models wi is the initial belt break in spring length. When the belt is
broken and
2-3/8” (
For ma to make sure the spring
e clutch engaged, adjust the nuts on the spring-loaded idler adjuster bolt until the length o
ng is between 2” and 2-1/8” (Fo
th 4-1/2” long spring). This
in after several hours of mowing, the running spring length should be between 2-1/4”
For models with 3” long spring) or 2-5/8” and 3-1/8” (For models with 4-1/2” long spring).
ximum belt life, periodic checks every 3-4 hours should be done
length has not exceeded the recommended running length.
Not
e: Failure to periodically adjust the belt tension will result in severe belt wear and
premature belt failure.
This model comes with a belt brake, which is a safety feature that stops the blades from turning
after the clutch is disengaged. The only time the brake should be in contact with t
he belt is when
the clutch is disengaged.
CAUTION: The brake stud must be adjusted. If the brake stud is not adjusted correctly,
the blades will still spin even though the clutch may be in the disengaged position. Alw
shut mower engine off before sen
rvici g.
Periodic brake stud inspections should be performed every 10 hours. In more severe cutting
conditions, more frequent inspections may be necessary. There are two parts to inspecting the
brake stud. Those two inspections are the disengaged spring length and brake stud clear
ance.
Note: It is quicker to perform the disengaged spring length and brake stud clearance
inspections if done simultaneously.
Disengaged Spring Length:
This inspection must be performed to make sure that there is proper braking force to prevent the
blades
disengae spring length. The spring must be between 2-5/8” and 2-7/8”
from spinning when the clutch is in the disengaged position. With the clutch in the
ged position measure th
(For models with 3” long spring) and between 3-1/4” and 4” (For models with 4-1/2” long spring) to
ays
11
provide the appropriate braking force. If the spring length is to long it will be necessary to adjust
the brake stud closer to the belt. If the spring length is to short it will be necessary to adjust the
brake stud further away from the belt. To make brake stud adjustments loosen the bolt on the top
of the brake stud and slide the brake stud in the slot. When the proper disengaged spring length
is achieved, tighten the bolt on the top of the brake stud. For this procedure do not adjust the
spring length. The spring length should only be changed when adjusting the be
lt tension.
Brake Stud Clearance:
This inspection is necessary to prevent over-braking. With the clutch engaged
, check to make
sure that there is at least 1/2” of clearance between the brake stud and the belt. If the clearance
is less than 1/2” then it will be necessary to adjust the brake stud away from the belt. Keep in
mind that the disengaged spring length must stay between 2-5/8” and 2-7/8” (For models with
3”
long spring) and between 3-1/4” and 4” (For models with 4-1/2” long spring).
CAUTION: If brake stud is not set in correct position, under-braking or over-braking may
occur. If over-braking occurs, premature belt failure or a possible fire could occur due to
excessive friction and overheating.
Clutch Arm
Front
Engine
Brake Stud
Initial Spring Length: 2” – 2-1/16” (Models with 3” long spring), 2-3/8” – 2-1/2” (Models with 4-1/2” long spring)
Running Spring Length: 2-1/4” – 2-3/8” (Models with 3” long spring), 2-5/8” – 3-1/8” (Models with 4-1/2” long spring)
Disengaged Spring Length: 2-5/8” – 2-7/8” (Models with 3” long spring), 3-1/4” – 4” (Models with 4-1/2” long spring)
Clutch Engagement
See Below For
Recommended Spring
Lengths
No Less Than 1/2” Clearance
Clutch Engaged
0” With Clutch Disengaged
With
Figure 7: Belt Pattern, Spring Adjustment, and Brake Adjustment
12
G.
MOWER BLADE REMOVAL, BALANCING & INSTALLATION
CAUTION:
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.
CAUTION: Always balance the mower blades each time they are shar
pened.
Out of b
bolts co
alance mower blades cause excess vibrations which lead to premature bearing failures,
ming loose, and overall deterioration of the wing mowers.
CAUTION: Always properly tighten the blade bolts to the specified torque. Failure to do so
can lead to saddle.
unwanted loosening of the blade and damage to the blade holding
The Models MR55K, MR55B and MR55T use 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 it’s 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
.
H. LUBRICATION
There are five lubrication points on the rough cut mower -- one spring-loaded idler pivot, two
caster wheel pivots, and two blade spindles. Lubricate at approximately 10 hr. intervals or more
often as required in dusty conditions. Lubricate the blade spindles 2-5 pumps every 50 hours.
(The bearings have trash guard seals to hold the seals in place during lubrication.) Lubricate with
a high grade of pressure gun grease.
Note: Do not over grease blade spindles. Blade spindles are initially greased at the factory.
Greasing before 50 hrs. may cause bearing seal damage which will result in premature
bearing failure.
I. STORAGE
Turn off wer is
stored one
during h
fuel shut off valve which is located on the underside of the gas tank. If the mo
utside, the engine should be covered to prevent water from getting inside the engi
eavy rainstorms. See the Engine Manual for additional information.
r) (4 ply Turf Pnuematic)Two 5.30/4.50 x 6Tw o 5. 30/ 4. 50 x 6Two 5.30/4.50 x 6Two 5.30/4.50 x 6
R
3/8-16x1.00 Thread Rolling5/16-18x1.50 Through Bolt5/16-18x1.50 Through Bolt5/16-18x1.50 Through Bolt
4444
VerticalVerticalVerticalVertical
1717.522-2320
MR55B-22-23HPMR55KMR55T
14
ACREASE ROUGH CUT MOWER PARTS LIST
ItemPart #DescriptionQuantity
1214021Cup Washer6
22 160 02Wir e Lock Pin, .31" x 2.50"2
3216009Screw Pin Shackle Clevis1
4222005Worm Drive Hose Clamp (7-7/8" to 9-1/8" Clamping Dia.)2
5225003Compression S pring, 3"L x 1-3/32" O.D. x .135" Wire dia.1
5225005Compression S pring, 4.50"L x 1-3/32" O.D. x .125" Wir e dia. 1
6226003Offset Wheel Assy. (1 5/600 x 6, 2 Pl y Turf)2
7226004Centered Wheel Assy. (5.30/4.50 x 6, 2 Ply Stud)2
8238004"V" Belt, .62" x 95.9" O.C.1
241008Sheave, (7-1/2" Dia., B-Sec tion) (1)
13259002Offset Mo wer Blade, 2-1/2" Wide, 30" Long, 3/4" Hole2
14264000Solenoid (Only on Models MR55B -17.5HP, MR55B-22-23HP & M R55T)1
1 52 640 03Hour/ Tack MeterOp t i onal
16264010Ignition Switch1
17269000Choke Control, 20" (Model MR55B-17.5HP & MR5 5T)1
17269007Choke Control, 22.5" (M odel MR55K)1
17269010Choke Control, 27" (Model MR55B-22-23HP)1
18269001Throttle Control, 15" (Model MR55B-17.5HP & MR55T)1
18269008Throttle Control, 46" (Model MR55K)1
18269009Throttle Control, 27" (Model MR55B-22-23HP)1
19275001Control Panel Decal, Starting Instructions1
19275002Warning Decal General1
19275003Danger Decal, Cut Finger2
19275011Clutch Engagement Decal1
19275007Warning Decal, Belt Sheild2
19275019Name Decal,Kunz1
19275021Name Decal, AcrEase1
19275022Name Decal, 57" Rough Cut1
20277002Rubber Gromet6
2 12 770 10F u el Tank , 3.75 G al . ( Pl a st ic ) ( Us e G as Cap 277 01 3)1
2 22 770 11Ha ndle Gr i p1
2 32 770 13G a s Cap (For Fuel Ta nk 2770 10)1
24600071Spacer, 1.38" O.D. x 1.33" Wall x 2.19" Long (MR55B & MR55T)1
24600173Spacer, 1.38" O.D. x 1.33" Wall x 2.25" Long (MR55K)1
25600126Flap Retainer Strip1
26600133Belt Sheild 2
27600136Brake Stud1
2 86 001 42Upper Pivot Su pport2
29600143Safety Be lting1
30600146Crank Arm2
15
ItemPart #DescriptionQuantity
31600189Idler Spacer Block1
32900023Control Panel1
33900049Bat tery Bo x Assy.1
34900058Hitch Pivot1
35900061Pivot Arm4
3 69 000 62Heig ht Ad ju s t Nut2
37900063Clutch Arm1
38900065Idler Arm As sy.1
243005Bronze Bearing, 1/2"I.D. x 3/4" O.D. x .75" Long2
39900066Screw Adjuster2
4 09 000 69M ower Dec k1
41900071Engine Support Bracket (Model MR55B-17.5HP & MR55T)1
41600172Engine Support Bracket (Model MR55K & MR55B-22-23HP)1
42900079Tank Support1
43900082Tongue1
4 49 001 06Ca rrier Arm2
243010Plastic Bearing, 1-3/8" O.D. x 1.00" I.D.4
45900148Caster Fork2
222012Single Split Collar (1" I.D. x .1/2" Thick)2
16
UACREASE ROUGH CUT MOWER PARTS
32
41
14
42 31
4
23
24
20
11
21
15
18
16
10
13
26
8
12
17
27
37
33
5
38
22
9
35
6
44
25
40
36
29
43
28
39
1
19
2
30
3
34
45
7
17
OPTIONAL EQUIPMENT
OPTIONAL WETLANDS KIT
The optional wetlands kit features an extra set of tires for added ground support in soft or water
saturated areas. The following are applications and features that the wetlands kit works best in.
• Great for wetlands or marshy areas that stay wet all year around.
• Works well in combination with small personal amphibious vehicles or tracked ATVs.
• More than doubles the tire surface area in contact with the ground.
• Very easy to install bolt-on kit.
• Works on all existing and new rough cut mowers.
• The rough cut mower
depth should be avoided.
•With the Wetlands Kit installed the minimum cutting height is 3.5” – 4”.
will notfloat with the wetlands kit installed. Water greater than 2-3" in
Wetlands Kit (Part # 003905)
18
OPTIONAL EQUIPMENT
OPTIONAL ELECTRIC LIFT KIT
The optional electric lift kit consists of all of the mounting hardware, brackets, electric actuator and
wiring with remote control panel.
• Great for constantly changing terrain and grass/brush heights.
• Allows for quick cutting height changes on the go from the seat of the tow vehicle.
• Raise up and over rocks and logs with ease.
• Heavy duty 1500 lb linear screw actuator made by Linak.
• Works on all existing and new rough cut mowers.
Electric Lift Kit (Part # 003909)
19
OPTIONAL EQUIPMENT
OPTIONAL FLOATATION KIT
The optional floatation kit consists of one additional front and rear tire, mounting brackets and
hardware.
•Great for mowing around ponds and on rough uneven ground wher e scalping would normally
occur.
•Clamping style receiver allows for adjustments from side to side with both the front and rear
tires.
• Pinned receivers make for quick kit removal when not needed.
• Works on all existing and new rough cut mowers.
Part numbers needed for standard manual lift rough cut models.
Rear Floatation Kit (Part # 003907)
Front Floatation Kit (Part # 003908)
Cross Br rear kit)
ace Tube (Part # 900113) (Purchase one brace for each front and
Part numbers ne electric lift kit.
eded for rough cut models with the
Rear Floatation Kit (Part # 003907)
Front Floatation Kit (Part # 003908)
20
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