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Stiga Mower Decks

This workshop manual provides instructions for assembling and servicing mower decks from 2008-2020. It details: 1) General assembly instructions that apply to all mower deck models, including recommended tightening torques. 2) Cutting theory that explains optimal cutting height and how inclining the deck forward affects mulching and grass dispersion. 3) Specific assembly instructions for several mower deck models, including the 85, 95, 105 Combi, 110/125 Combi Pro, and 100 Combi 3. 4) Maintenance procedures like replacing blades, belts, pulleys, and bearings. The manual provides technicians with guidance on properly assembling, adjusting, and

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Peter Jenkins
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0% found this document useful (0 votes)
4K views48 pages

Stiga Mower Decks

This workshop manual provides instructions for assembling and servicing mower decks from 2008-2020. It details: 1) General assembly instructions that apply to all mower deck models, including recommended tightening torques. 2) Cutting theory that explains optimal cutting height and how inclining the deck forward affects mulching and grass dispersion. 3) Specific assembly instructions for several mower deck models, including the 85, 95, 105 Combi, 110/125 Combi Pro, and 100 Combi 3. 4) Maintenance procedures like replacing blades, belts, pulleys, and bearings. The manual provides technicians with guidance on properly assembling, adjusting, and

Uploaded by

Peter Jenkins
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 48

WORKSHOP MANUAL

Mower Decks
2008 - 2020
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 1

Mower Deck
Contents in this chapter
1.1 General 1.5 Mower deck 110/125 Combi Pro . 24
1.1.1 General tightening torque........... 2 1.5.1 Assembly on delivery................ 24
1.2 Cutting theory ................................ 3 1.5.2 Raising the deck ....................... 26
1.2.1 Cutting height ............................. 3 1.5.3 Replacement of blades ............. 28
1.2.2 Incline ......................................... 3 1.5.4 Replacement of belt.................. 28
1.3 Original blades............................... 4 1.5.5 Adjustment of the belt ............... 30
1.3.1 Why it is so important to use origi- 1.5.6 Replacements of pulleys, shafts
nal blades and blade tips from the and bearings ............................. 31
retail dealer? ............................... 4 1.5.7 Linkage ..................................... 33
1.4 Mower deck 85, 95, 105 Combi ..... 5 1.6 Mower deck 100 Combi 3 ............ 34
1.4.1 Assembly on del. of Park 4WD with 1.6.1 Assembly on delivery................ 34
fixed deck conn. and Villa/Ready 5 1.6.2 Washing position ...................... 36
1.4.2 Assembly on delivery of Park 2WD 1.6.3 Service position ........................ 36
with fixed deck connections ........ 7 1.6.4 Basic setting ............................. 40
1.4.3 Assembly on delivery of machines 1.6.5 Replacing blades ...................... 40
with quick connections ................ 8 1.6.6 Replacement of belts ................ 41
1.4.4 Basic setting ............................... 9 1.6.7 Adj. and verifying the belt ......... 42
1.4.5 Washing position ........................ 9 1.6.8 Replacements of pulleys and
1.4.6 Service position ........................ 10 bearing housings....................... 43
1.4.7 Safety ....................................... 14 1.6.9 Linkage ..................................... 44
1.4.8 Replacement of blades............. 15 1.7 Quick connections....................... 45
1.4.9 Repl. of belt, Villa/Ready-deck . 17 1.7.1 Description................................ 45
1.4.10 Repl. of belt, Park-deck .......... 20 1.7.2 Assembly .................................. 45
1.4.11 Rep. of center pulley bearings 22 1.7.3 Using the quick connections ..... 46

6. Mover Deck
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 2

1 General
The decks are equipped with two or three synchronised rotating blades. The tracks of
adjacent blades are overlapping each other, which means that the synchronization is vital.
All shafts/pulleys are pivoted in sealed and permanent lubricated ball bearings.
All decks are provided with aquick-coupling to simplify the lifting up procedure for cleaning
and inspection and. The decks are also provided with an electrical or manual adjusting
device for the cutting height.
All decks are tested prior to delivery and are delivered as completely assembled as
possible. This ensures that assembly on delivery is rapid and simple.
This chapter describes assembly on delivery, repair, replacements and adjustments of
stressed parts of the mower decks.

1.1 General tightening torque


Unless otherwise stated, the following tightening torque are applicable for screws and nuts
on the machine:

Tightening torques:
Thread Torque
M5 5 Nm
M6 9 Nm
M8 22 Nm
M10 45 Nm

Note!
Blade shafts with external threads, cutted at the shaf, have special tightening torques.
Note the actual torque in the special case.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 3

1 Cutting theory
1.1 Cutting height
The best cutting results are achieved when the
when the top third of the grass is cut off.
I.e. 2/3 of the length of the grass remains.
If the grass is long and has to be cut
significantly, cut twice using different cutting 1/3
heights.
Do not use the lowest cutting heights if the lawn
surface is uneven. This would entail a risk of the
blades being damaged against the surface and
the lawn’s top layer of soil being removed.

1.2 Incline
The cutting deck’s rear section can be lifted so
that the deck has a greater forward incline than
that provided by the basic setting. This incline
affects the cutting results as follows.

No incline
When the deck is in the basic setting, the best
mulching effect and good dispersion of the cut
grass are achieved. The basic setting is
recommended for normal grass.

Incline
When the cutting deck is inclined forwards, the
mulching effect is reduced while the cut grass is
dispersed better.
Inclining forwards is recommended for thicker
grass.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 4

2 Original blades
2.1 Why it is so important to use original blades and blade tips from the
retail dealer?
The table below shows the demands on original blades and blade tips, delivered from the
retail dealer.
The table is intended to display the importance to use theoriginal blades and blade tips.

Demand Remarks
No splitting of blade tips. Using steel balls, the manufacturer simulates what can
happen if you drive over foreign objects on the lawn. The
sharpening of the blades may be destroyed, but no parts are
. allowed to loosen or fly away.

No splitting of blades. The impact test is the toughes durability test a lawn mower can
be subject to. An iron pipe is placed right into the blades during
operation.
. The blade can be deformed but it may not under any
circumstances, come off or split.
This test verifies that blades and other parts fulfil the high
safety requirements.

Optimal balance. Blades and blade tips from the retail dealer have exactly the
Minimum of noise. same weight.
Minimum of vibrations. Blades and blade tips from the retail dealer are optimal
balanced.

. This guarantee a minimum of vibration and noise which gives


a maximal durability of the machine.
It also guarantee that the machine corresponds to the
specification according to noise and vibrations.
Optimal cutting result. Blades and blade tips from the retail dealer are optimized in
the application. I.e. the blades are adapted to the shape och
the cover and the numberof revolutions to give the best cutting
result.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 5

3 Mower deck
85, 95, 105 Combi
3.1 Assembly on delivery of Park 4WD
with fixed deck connections and
Villa/Ready
1. Place the deck in position in front of the
machine. (D)
C
B
2. Check that the deck mounts are installed on A
the machine as follows.
• Washer (D). Only machines up to and
including 2006.
• Deck mount (C).
• Washer (B).
• Circlip (A).

3. Screw the arms into each other.

4. Remove the belt cover (H) by loosening the


screws (I).
H

I
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 6

5. Loosen the belt guide screws (K) a couple of Villa, Ready


turns.

Park 4WD

6. Set the maximum cutting height. K


7. Work off the belt from the cutting deck pulley.
8. Fit the belt to the machine pulley and after
that to the cutting deck pulley.
9. Tighten the belt guide screws (K).
10.Tension the belt as follows.
Park 4WD: Park 4WD
Grip the belt tensioner’s lever with your left
hand. Pull the lever and apply the tensioner
to the outside of the belt with your right hand.

Villa, Ready:
Tension the belt with the belt idler. The belt Villa / Ready
idler should be on the inside of the belt and
pull out to the left (viewed from the driver’s
position).

11.Install the belt cover (H) with the screws (I).


Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 7

12.Suspend the unit in the implement lifter.


13.Perform the cutting deck basic setting. See
“"Basic setting" at page 9”.
14.If the deck has electrical cutting height
adjustment, connect the cable to the
machine’s front right socket.

3.2 Assembly on delivery of Park 2WD


with fixed deck connections Park 2WD
1. Place the deck in position in front of the
machine.
2. Check that the deck mounts are installed on
the machine as follows. E
• Deck mount (G).
• Washer :F).
• Lock pin (E).
F

3. Screw the arms into each other.


4. Set the maximum cutting height.
5. Locate the belt around the machine’s belt
pulley.
6. Tension the belt as follows.
Tension the belt with the belt idler. The belt
idler should be on the left side of the belt
viewed from the driver’s position.
7. Suspend the unit in the implement lifter.
8. Perform the cutting deck basic setting. See
“"Basic setting" at page 9”.
9. If the deck has electrical cutting height
adjustment, connect the cable to the
machine’s front right socket.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 8

3.3 Assembly on delivery of machines


with quick connections
1. Place the deck in position in front of the
machine.
2. Check that the quickconnections are fitted to
the machine See "Quick connections" at
page 45.
3. Screw the arms into each other.
4. Set the maximum cutting height.
5. Set the quick connections in their rear
positions. See their supplied separate
instruction.
E
6. Fit the belt on to the machine pulley.
F

7. Tension the belt as follows.


Park 4WD: Park 4WD
Grip the belt tensioner’s lever with your left
hand. Pull the lever and apply the tensioner
to the outside of the belt with your right hand.

Park 2WD:
Park 2WD
Tension the belt with the belt idler. The belt
idler should be on the left side of the belt
viewed from the driver’s position.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 9

8. Set the quick connections in their front


positions and fit the locking pins (C).
C

9. Suspend the unit in the implement lifter.


10.Perform the cutting deck basic setting. See
"Basic setting" at page 9”.
11.If the deck has electrical cutting height
adjustment, connect the cable to the
machine’s front right socket.

3.4 Basic setting


In order for the cutting deck to cut optimally, the 17”
correct basic setting is required. The deck is in
the basic setting when its rear edge is 5 mm
above its front edge. This means that the deck
is inclined forwards.
Move the deck to the basicsetting by lifting and
securing as follows.
On machines with 17” wheels: Install the
washers and the pins in the top hole.
On machines with 16” wheels: Install the
washers and the pins in the middle hole. 16”

3.5 Washing position


1. Activate the parking brake.
2. Set the implement lifter in transport position.
3. Set the highest cutting height.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 10

4. Detach the rear section of the deck on the


right and left-hand side as follows:
A. Lift up the left-hand rear section of the C
deck slightly to reduce the load from the
cotter pin.
B. Remove pins and washers.
C. Remove the right-hand cotter pin and
washer in the same way.

B A
5. Grip the front edge of the deck and lift up.
Hook on the chain so that the deck is
pointing diagonally upwards.
Warning!
It is absolutely forbidden to start the
engine when the deck is in the washing
position.
Reset the deck accordingto the actual previous
described assembly instruction.

3.6 Service position


Park 4WD with fixed deck connections and
Villa/Ready
1. Activate the parking brake.
2. If the deck has electrical cutting height
adjustment, disconnect the cable from the
machine.
3. Set the maximum cutting height. C
4. Detach the rear section of the deck on the
right and left-hand side as follows:
A. Lift up the left-hand rear section of the
deck slightly to reduce the load from the
cotter pin.
B. Remove pins and washers.
C.Remove the right-hand cotter pin and B A
washer in the same way.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 11

5. Remove the belt cover (H) by loosening the


screws (I). H
6. Loosen the belt guide screws (K) a couple of
turns.

I
7. Release the belt tension as follows. Park 4WD
Park 4WD:
Grip the belt tensioner’s lever with your left
hand. Pull the lever and remove the
tensioner with your right hand.

Villa, Ready:
Remove the tensioner from the belt. Villa / Ready

8. Force the belt off the deck’s pulley.

9. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the ground.

Reset the deck accordingto the actual previous


described assembly instruction.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 12

Park 2WD with fixed deck connections


1. Activate the parking brake.
2. If the deck has electrical cutting height
adjustment, disconnect the cable from the
machine.
3. Set the maximum cutting height. C
4. Detach the rear section of the deck on the
right and left-hand side as follows:
A. Lift up the left-hand rear section of the
deck slightly to reduce the load from the
cotter pin.
B. Remove pins and washer.
C.Remove the right-hand cotter pin and B A
washer in the same way.
5. Release the belt tension by removing the Park 2WD
belt tensioner.
6. Force the belt off the machines’s pulley.

7. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the ground.

Reset the deck accordingto the actual previous


described assembly instruction.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 13

Machines with quick connections


1. Activate the parking brake.
2. If the deck has electrical cutting height
adjustment, disconnect the cable from the
machine.
3. Set the maximum cutting height. C
4. Detach the rear section of the deck on the
right and left-hand side as follows:
A. Lift up the left-hand rear section of the
deck slightly to reduce the load from the
cotter pin.
B. Remove pins and washer.
C.Remove the right-hand cotter pin and B A
washer in the same way.
5. Set the quick connections in their rear
positions.

6. Release the belt tension as follows. Park 4WD


Park 4WD:
Grip the belt tensioner’s lever with your left
hand. Pull the lever and remove the
tensioner with your right hand.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 14

Park 2WD:
Park 2WD
Remove the tensioner from the belt.

7. Force the belt off the deck’s pulley.

8. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the ground.

Reset the deck accordingto the actual previous


described assembly instruction.

3.7 Safety
To reduce the risk of accidental injury in the
event of a collision and to protect important
parts in the cutting deck, a force limiter is
integrated as follows.
• Shear bolts between blades and blade bar.
• Torque limiting between gear wheels and
blade shaft.
• Possibility of positive drive belt slipping on
the plastic gear wheels.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 15

3.8 Replacement of blades


Warning!
The blades are sharp. Always wear
gloves when working with the blades
to avoid injury.
Warning!
H
When replacing, both blades on the
same blade bar must be replaced to
avoid imbalance.

Disassembly
1. Remove the belt cover (H) by unscrewing
the screws (I).
I
2. Check the torque limiting between gear
wheels and blade shaft. The arrows in the
figure must be opposite each other for an
intact deck. When torque limiting has
deployed, the arrows are not opposite each
other.

1. Rise the deck to its service position. See


“Service position” at page 10.
2. Release the screws that hold the blades, and
remove the blades.
3. After removing the blades, check whether the
shafts are damaged. This is best done by
rotating the shafts to see if they are out of
true.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 16

Assembly
1. Fit the blades according to the figure.
The sharpened surfaces of the blades shall
face in the rotation direction which is left
when the deck is raised.
Note the following when reassembling:
• The blades and blade bar must be installed
as in the figure.
• The blades can be turned 1/3 of a turn in
R
their mountings. Select positions so that Q P
the blades are offset 90° from each other.
See "Synchronising, blades" at page 17.
Tightening torque:
Screws (P) - 45 Nm
Shear bolts (Q) - 9.8 Nm P Q
45 Nm
In the event of a collision, the shear bolts (Q)
can break and the blades bend back. If this has
happened, install genuine shear bolts and
tighten as above.
2. Tighten all screws.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 17

Synchronising, blades
The deck has synchronised blades.
If one of the blades has struck a solid object
(e.g. a stone), the synchronisation may be
altered. This entails a risk of the blades
colliding with each other.
Correctly synchronised blades must be offset
90° from each other. See the figure.
Always check synchronisation after a collision.
If the blades are not synchronised, one or more
of the following faults may have occurred in the
cutting deck:
• The positive drive belt has slipped on the
gear wheels.
• Torque limiting between gear wheels and
blade shaft has deployed. The arrows in
the figure must be opposite each other for
an intact deck. When torque limiting has
deployed, the arrows are not opposite
each other.
• The blade member is incorrectly installed
on the blade shaft. Can be installed in
three different positions. See the previous
page.

3.9 Replacement of belt,


Villa/Ready-deck
Disassembly
1. Remove the belt cover (H) by unscrewing
the screws (I). Use a 12 mm box spanner. H

I
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2010-11-05 Workshop Manual Mower Decks 18

2. Remove the following:


A
• Belt guide with screws (13 mm key)
• Shaft screw with washer (19 mm key)
• Pull up the pulley (A).

3. Loosen the four screws for the left bearing


housing a couple of turns.
Note!
The left bearing housing is lateral
adjustable to perform the timing belt
adjustment.

4. Remove the key at the right shaft and lift the


pulley together with the belt.

Checks
1. Check the torque limiting between gear
wheels and blade shaft. See "Synchronising,
blades" at page 17.
2. Check the two blade shaft bearings as
follows:
• Grab the pulley and force it in the radial
direction. No radial play shall be felt.
• Grab the knife and force it in the radial
direction. No radial play shall be felt.
• Rotate the shaft. No abnormal bearing
noise shall be heard.
The bearing housings are not divided in
additional spare parts. If bearing failure is
detected, replace the entire bearing housing.
Edition Manual Product Page
2010-11-05 Workshop Manual Mower Decks 19

Assembly of belt, Villa/Ready-deck


Assemble the timing belt in the reverse order.
Correctly synchronised blades must be offset
90° from each other. See "Synchronising,
blades" at page 17.
Before the the left bearing housing screws are
tightened, the belt shall be adjusted. Alternative A
Adjust as follows:
Alternative A
300 N
1. Stretch the belt by pulling the the left bearing
housing with a force of 300 N (30 kg).
2. Tighten the four bearing housing screws.
Alternative B
1. Stretch the belt by pulling the the left bearing Alternative B 10 mm
housing.
2. Tighten the four bearing housing screws.
3. Apply a force as per the table below in the
middle of the belt. The belt shall move 10
mm. If not, loosen the bearing housing and
repeat step 1-2 above until the movement is
OK.
Timing belt adjustments:
85 Combi 95 Combi
Deck
85 Villa 95 Villa
Force 45 N 35 N
Movement 10 mm 10 mm 35/45 N
Frequency 64 Hz ± 5% 64 Hz ± 5%

When assembling the belt cover (H) use the


two M8-screws with 12 mm head. H
The cover recesses have no place for a 13 mm
spanner.

12 mm head
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2010-11-05 Workshop Manual Mower Decks 20

3.10 Replacement of belt,


Park-deck
H
Disassembly
1. Remove the belt cover (H) by unscrewing
the screws (I). Use a 12 mm box spanner.

2. Remove the belt guide with screws (13 mm


spanner).

3. Loosen the left and right bearing housing


screws a couple of turns (8 screws).
Note!
The bearing housings are lateral
adjustable to perform the timing belt
adjustments.
4. Work off the belts from the pulleys.

Checks
1. Check the torque limiting between gear
wheels and blade shaft. See "Synchronising,
blades" at page 17.
2. Check the two blade shaft bearings as
follows:
• Grab the pulley and force it in the radial
direction. No radial play shall be felt.
• Grab the knife and force it in the radial
direction. No radial play shall be felt.
• Rotate the shaft. No abnormal bearing
noise shall be heard.
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2010-11-05 Workshop Manual Mower Decks 21

The bearing housings are not divided in


additional spare parts. If bearing failure is
detected, replace the entire bearing housing.
3. Check the center pulley bearings as follows:
• Grab the pulley and force it in the radial
direction. No radial play shall be felt.
• Rotate the pulley. No abnormal bearing
noise shall be heard.
To replace bearings, see "Replacements of
center pulley bearings" at page 22.

Assembly of belt, Park-deck


Assemble the timing belts in the reverse order.
Before the the left and right bearing housing
screws are tightened, the belts shall be
adjusted.
Alternative A
Adjust as follows:
Alternative A
1. Stretch the belt by pulling the the bearing
housings with a force of 300 N (30 kg). 300 N
2. Tighten the bearing housing screws.
Alternative B
1. Stretch the belt by pulling the the left bearing
housing. Alternative B 10 mm
2. Tighten the four bearing housing screws.
3. Apply a force as per the table below in the
middle of the belt. The belt shall move 10
mm. If not, loosen the bearing housing and
repeat step 1-2 above until the movement is
OK.
Timing belt adjustments:
95 Combi 105 Combi
Deck
95 Combi Park 105 Combi Park
Force 80 N 70 N
Movement 10 mm 10 mm
Frequency 128 Hz ± 5% 122 Hz ± 5%

80/70 N
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2010-11-05 Workshop Manual Mower Decks 22

When assembling the belt cover (H) use the


two M8-screws with 12 mm head.
The cover recesses have no place for a 13 mm
spanner.

12 mm head

3.11 Replacements of center pulley


bearings
To replace the center pulley bearings, first
remove the timing belts. See "Replacement of
belt, Park-deck" at page 20.
Proceed as follows:
1. .Remove the pulley plate by unscrewing the
two screws.

2. Set up the unit in a vise and disassemble it.


Use two 17 mm spanners.
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3. Replace defective parts and assemble in the


reverse order. According the parts location,
see the figure.

24 Nm
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2010-11-05 Workshop Manual Mower Decks 24

4 Mower deck
110 and 125 Combi Pro
4.1 Assembly on delivery
This instruction describes assembly with fixed
deck connections. If quick connections shall be
used, see "Quick connections" at page 45.

Mower deck
1. Take the deck out of the box.
2. Place the cutting deck in position in front of
the machine.
3. Install the deck mounts on the front shafts.
Note!
One flat washer shall be placed at each
side of the deck arms onto the wheel
shafts.
4. Remove the pins and the washers on both
sides.
5. Screw the arms into each other.

6. Suspend the cutting deck in the implement


lifter.
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6. If the deck has electrical cutting height


adjustment, connect the cable to the
machine’s front right socket.

Belt
The cutting deck’s rear section should rest on
the floor (it should not be lifted or secured).
Install the belt as follows:
1. Set the maximum cutting height.

2. Locate the belt around the machine’s belt


pulley (B).
3. Fit the V-belt to the articulation point pulley
and tension the belt by hooking up the lever
or the spring, depending on model.

4. Lift up and secure the rear section of the


cutting deck.
On machines with 17” wheels: Install the
washers and the pins in the top hole.
On machines with 16” wheels: Install the
washers and the pins in the middle hole.
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4.2 Raising the deck


The deck can be raised according to two
procedures:
• 45° for washing and cleaning.
• 90° for service.

Washing position
1. Activate the parking brake.
2. Set the implement lifter in transport position.
3. Set the lowest cutting height.
4. Remove pins and washers.

5. Grip the front edge of the deck and lift up.


Hook on the chain so that the deck is
pointing diagonally upwards.
It is absolutely forbidden to start the engine
when the deck is in the washing position.
Reset washing position
1. Lower the deck.
2.Proceed according to position 4 at page 25.

Service position
1. Activate the parking brake.
2. Set the implement lifter in transport position.
3. If the deck has electrical cutting height
adjustment, disconnect the cable from the
machine.
4. Set the highest cutting height.
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5. Remove pins and washers.

6.Slacken the belt by hooking off the lever or


the spring, depending on model and remove
the V-belt from the articulation point pulley.

8. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the floor.

Reset service position


1. Lower the deck.
2. Proceed according to "Assembly on
delivery" at page 24, position 6 and further.
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4.3 Replacement of blades


Warning!
The blades are sharp. Always wear
gloves when working with the blades
to avoid injury.
1. Rise the deck to its service position. See
“Service position” at page 26.
2. Release the screws that hold the blades, and
remove the blades.
After removing the blades, check whether the
shafts are damaged. This is best done by
rotating the shafts to see if they are out of
true. 24 Nm
3. Fit the blades with the raised edge towards
the blade attachment.
The sharpened surfaces of the blades shall
face in the rotation direction which is left when
the deck is raised.
3. Tighten the screws.
24 Nm
Note!
The blades shall be tightened to 24 Nm.

4.4 Replacement of belt


To replace the internal belt, follow the steps
below:
1. Rise the two attachment arms and let them
rest against the frame tubes.
Note!
To avoid laquer damages, place protection
plates under the arms.
2. If necessary, remove the top cover.
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3. Set the cutting height to max. If the deck is


provided with electrical height adjustment,
connect the cable either to a machine and
use the machine switch or to a separate
battery.

4. Remove the deck cover by loosening the two


rear screws and if necessary the belt guide
with its two screws.
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5. Force the belt over a suitable pulley and


remove the belt. The tensioning roller will
follow automatic.
6. Check the three knife shaft bearings as
follows:
• Grab the pulley and force it in the radial
direction. No radial play shall be felt.
• Grab the knife and force it in the radial
direction. No radial play shall be felt.
• Rotate the shaft. No abnormal bearing
noise shall be heard.
7. Check the linkage for play and other
damages.
8. If bearing faults are determined, proceed
with “"Replacements of pulleys, shafts and
bearings" at page 31” below.
If the linkage needs repair, proceed with
“"Linkage" at page 33”.
Otherwise mount the new belt in the reverse
order.
Note!
Always use original spare belts from the
retail dealer.

4.5 Adjustment of the belt


The internal belt is automatic adjusted by the
roller, fitted on the spring forced lever, and does
not need any further adjustment.
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4.6 Replacements of pulleys, shafts


and bearings
A
To replace the pulleys,shafts and bearings, first
remove the internal belt as described
previously.
B
Below is described the disassembly/assembly
of the center shaft unit. To repair the other units,
use the applicable instructions described C
below.

Blade shaft pulley and blade shaft D


Warning!
The blades are sharp. Always wear 19 mm
gloves when working with the blades E
to avoid injury.
1. Hold the blades under the deck by hand and
remove the pulley nut (A) with washer (B). F
Use a 17 mm ring spanner.
2. Support the shaft unit against the floor with a
G
wood piece or similar and remove the
following parts:
• Upper pulley (C)
• Key (D)
• Distance sleeve (E)
• Lower pulley (F)
• Key (G)
3. Lift the deck carefully at the front and pull out
the shaft unit downwards.
If the bearings shall be replaced, proceed with
“Bearings” below. Otherwise proceed with
“Assembly”.

Blade shaft bearings


1. Remove the four screws, holding the bearing
housing. Use two 13 mm spanners.
2. Take out the bearing housing.
3. Replace the bearings as described in
position 3-7 at page 32.
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Assembly
Note!
According the blades, see "Replacement
H
of blades" at page 28.

Assemble the shaft unit in the reverse order.


1. The bearings (H) and sleeve (I) shall be
mounted in the bearing housing.
2. Fit the bearing housing on the deck with the
four screws and washers. I

3. Mount the washers (J and K) and sleeve (L)


on the shaft. H
4. Push up the shaft through the bearings.
J
5. Assemble the upper parts as described at
the previous page.
K
Note!
The pulleys (F) shall be turned with the
mark (UP) faced upwards. L

Note!
The blades shall be tightened to 24 Nm.

24 Nm
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4.7 Linkage
1. Remove the covers as described in
"Replacement of belt" at page 28.
2. The cutting height shall remain in the upper
position. In this position, the spring has a
minimum of tension.
3. Bend a 1 mm steel wire to form a narrow
hook, fit it to the spring loop and pull off the
spring.

4. Remove the elbow links. Use a 13 spanner


and hold with a 11 mm U-spanner.
5. Replace defective parts and assemble in the
reverse order.

Adjustment of linkage
The deck linkage desires the difference
between the ground height at the rear and front
part of the deck. To achieve correct basic
setting of the deck, perform the inclination
adjustment as follows:
1. Place a plane-parallel plank under the
wheels.
2. Adjust the linkage until the deck front edge is
22 mm from the plank.
3. Refit and lock the linkage adjustments.

Assembly
Assemble all parts in the reverse order.
22 mm
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5 Mower deck 100 Combi 3 4WD


D
5.1 Assembly on delivery B
C
A
This instruction describes assembly with fixed
deck connections. If quick connections shall be
used, see "Quick connections" at page 45.
Example of fixed deck connections, see C and
G.
1. Place the deck in position in front of the
machine.
2. Check that the deck mounts are installed on 2WD
the machine as follows.
Park 2WD:
• Deck mount (G).
• Washer (F).
• Lock pin (E). E
Alt.
Park 4WD:
• Washer (D). Only machines up to and
F
including 2006.
• Deck mount (C).
• Washer (B). G
• Circlip (A).
3. Remove pins and washer (A, B).
A

B
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4. Screw the arms into each other.


5. Set the maximum cutting height.
6. Fit the belt on to the machine pulley.
7. Perform the cutting deck basic setting. See
"Basic setting" at page 40.

8. Tension the belt as follows.


Park 2WD: 2WD
Tension the belt with the belt idler. The belt
idler should be on the left side of the belt
viewed from the driver’s position.

Park 4WD: 4WD


Grip the belt tensioner’s lever with your left
hand. Pull the lever and apply the tensioner
to the outside of the belt with your right hand.

9. Suspend the unit in the implement lifter.


10.If the deck has electrical cutting height
adjustment, connect the cable to the
machine’s front right socket.
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5.2 Washing position


A
1. Activate the parking brake.
2. Set the implement lifter in transport position.
3. Set the highest cutting height.
4. Detach the rear section of the deck on the B
right and left-hand side as follows:
A. Lift up the left-hand rear section of the deck
slightly to reduce the load from the cotter pin.
B. Remove pins and washer.
C. Remove the right-hand cotter pin and
washer in the same way.

5. Grip the front edge of the deck and lift up.


Hook on the chain so that the deck is
pointing diagonally upwards.
It is absolutely forbidden to start the
engine when the deck is in the wash-
ing position.
6. Lower the deck to the ground in reverse
order after the corrective actions have been
carried out. Reset the deck according to
"Basic setting" at page 40.

5.3 Service position


Machines with fixed deck connections
1. Activate the parking brake.
2.If the deck has electrical cutting height
adjustment, disconnect the cable from the Alt.
machine.
3. Set the maximum cutting height.
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4. Detach the rear section of the deck on the


right and left-hand side as follows: A
A. Lift up the left-hand rear section of the deck
slightly to reduce the load from the cotter pin.
B. Remove pins and washer.
C. Remove the right-hand cotter pin and B
washer in the same way.

5. Release the belt tension as follows:


2WD
Park 2WD:
Remove the tensioner from the belt.

Park 4WD:
Grip the belt tensioner’s lever with your left
4WD
hand. Pull the lever and remove the
tensioner with your right hand.
6. Force the belt off the machines’s pulley.
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7. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the ground.
8. Lower the deck to the ground in reverse
order after the corrective actions have been
carried out. Reset the deck according to
"Basic setting" at page 40.

Machines with quick connections


1. Activate the parking brake.
2. Set the maximum cutting height.
3. If the deck has electrical cutting height
adjustment, disconnect the cable from the
Alt.
machine.

4. Detach the rear section of the deck on the


right and left-hand side as follows: A
A. Lift up the left-hand rear section of the deck
slightly to reduce the load from the cotter pin.
B. Remove pins and washer.
C. Remove the right-hand cotter pin and
B
washer in the same way.
5. Set the quick connections in their rear
positions. See their supplied separate
instruction.
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6. Release the belt tension as follows. 2WD


Park 2WD:
Remove the tensioner from the belt.

Park 4WD:
Grip the belt tensioner’s lever with your left
4WD
hand. Pull the lever and remove the
tensioner with your right hand.
7. Force the belt off the deck’s pulley.
Check that the quick connections are
in their front positions before raising
the deck. Otherwise there is a risk of
crushing injuries.
8. Set the quick connections to their front
positions, see separate instructions.
9. Grip the front edge of the deck and lift up. Lift
until the deck is completely vertical and rest
the rear edge on the ground.
10.Lower the deck to the ground in reverse
order after the corrective actions have been
carried out. Reset the deck according to
"Basic setting" at page 40.
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5.4 Basic setting


In order for the cutting deck to cut optimally, the
correct basic setting is required. The deck is in
the basic setting when its rear edge is 5 mm
above its front edge. This means that the deck
is inclined forwards. 17”
Move the deck to the basicsetting by lifting and
securing as follows.
On machines with 17” wheels: Install the
washers and the pins in the top hole.
On machines with 16” wheels: Install the
washers and the pins in the middle hole.

16”

5.5 Replacing blades


Wear protective gloves when chang-
ing blade(s) to avoid cutting yourself.

Check that the blades are always sharp. This


produces the best cutting results.
Always check the blade(s) after a collision. If
the blade system has beendamaged, defective 45 Nm
parts should be replaced.
Always use genuine spare parts. Non-
genuine spare parts can entail a risk of
injury, even if they fit the machine.
The full blade is replaced when the edges are
worn.
Install the new blade with the punched text
facing down.
Tightening torque: 45 Nm.
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5.6 Replacement of belts


The cutting deck is provided with 2 belts:
• One external belt which pick up the power
from the machine.
• One internal belt, connecting the knife shafts.

External belt
The external belt can be replaced with the
deck mounted to the machine or not. Replace
the external belt as follows:
1. Remove the yellow belt cover by unscrewing
the front screw and hooking up the rear part
of the cover. Use a T20 torx wrench.
2. Remove the belt guide by unscrewing the
two screws. Use a T20 torx wrench.
3. Replace the belt and assemble the parts in
the reverse order.
Do not overtighten the screws, this
will damage the threads in the plastic
material.

Internal belt
To replace the internal belt, follow the steps
below:
1. Remove the cutting deck from the machine.
2. Remove the external belt as described
above.
3. If the deck has electric cutting height
adjustment, unhook the cable from the deck
cover.
4. Remove the deck cover by loosening the
three screws. Use a 13 mm spanner.
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5. Force the belt over a suitable pulley and


remove the belt. The tensioning roller will
follow automatic.
6. If the deck has electric cutting height
adjustment, loosen the motor attachment at
one end to get space for the belt.
7. Remove the belt.
8. Check the three knife shaft bearings as
follows:
• Grab the pulley and force it in the radial
direction. No radial play shall be felt.
• Grab the knife and force it in the radial
direction. No radial play shall be felt.
• Rotate the shaft. No abnormal bearing
noise shall be heard.
9. Check the linkage for play and other
damages.
10.If bearing faults are determined, proceed
with “7.8” below.
If the linkage needs repair, proceed with
“7.9”.
Otherwise mount the new belt in the reverse
order.
Note!
Always use original spare belts from the
retail dealer.
Note!
If the deck has electric cutting height
adjustment, always fit its attachments with
new circlips.
5.7 Adjustment and verifying the belt
The internal belt is automatic adjusted by the
roller, fitted on the spring forced lever, and does
not need any further adjustment.
However, the spring tension and the belt can be
verifyed by measuring the belt tension/bending
as follows:
30 mm
Apply a force of 50-60 N in the middle of the
belt. The belt shall move 30 mm.
50-60 N
If not, replace the spring or the belt and repeat
the verifying.
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5.8 Replacements of pulleys and bear-


ing housings
A
To replace the pulleys and bearing housings,
first remove the internal belt as described B
previously.
C
Below is described the disassembly/assembly
of the center shaft unit. To repair the other units, D
use the applicable instructions described
below. E
Warning! F
The blades are sharp. Always wear G
gloves when working with the blades
to avoid injury. 19 mm
1. Hold the actual blade under the deck by
hand and remove the pulley screw (A) with
washer (B). Use a 17 mm ring spanner.
2. Remove the following parts:
• Upper pulley (C)
• Key (D)
• Distance sleeve (E)
• Lower pulley (F)
• Key (G)
3. Remove the four screws, holding the bearing
housing. Use a 13 mm spanner.
4. Take out the bearing housing.
5. Remove the blade, see "Replacing blades"
at page 40.

Assembly
Assemble the bearing housing in the reverse
order.
Note!
According the blades, see "Replacing
blades" at page 40.
Note!
The pulley (C) shall be turned with the UP
mark (UP) faced upwards.
Note!
The blades shall be tightened to 24 Nm.
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5.9 Linkage
B
The linkage has no adjustment points and is
therefore easy to disassemble/assemble.
To get access to the linkage, disassemble the
deck cover. See "Internal belt" at page 41. 19 mm
When assembling the linkage, always use new
circlips. C

Disassembly the parallel links


After a long time of use, the bushings for the
parallel links, can be worn out. To replace
A
these, follow the instructions below:
1. Disassemble the four parallel links (A) from
the deck by unscrewing the two arms (C)
and the four screws (B) with nuts.
2. Push out the sleeves (D) and the bushings
(E).
If the sleeves are difficult to slide out, set up
the link in a vise, and use a hammer and a
drift punch. E
Assembly the parallel links D
Assemble the parallel links in the reverse order.

Note!
The links with the threaded holes (F) for
the arms (C) shall be placed at the
bottom and with the threaded holes
outwards.
Note!
The links without threads in the holes (G)
shall be placed at the top and with the
holes inwards.
G

F
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6 Quick connections
6.1 Description
The quick-release mountings are intended for
use on Stiga’s Park machines, 2WD and 4WD.
The quick-release mountings allow the deck to
be moved easily between the two positions:
• Normal position with fully tensioned belt.
• 4 cm behind the normal position with slack-
ened belt.
As the belt idler is released from the belt, the
quick-release mountings simplify belt and deck
replacement, and also make shifting to the
washing position and service positions easier.

6.2 Assembly
The delivery consists of the following
components. The figures only display the right- Park 2WD
hand side, but the numbers below refer to both
sides. A B

Position 2WD 4WD B


A 2 cotter pins 2 locking rings C
B 4 washers 4 washers
C 2 locking pins 2 locking pins
D Quick-release Quick-release
mounting, right mounting, right D
and left and left
E 2 screws 2 screws
F 2 nuts 2 nuts Park 4WD
A B
Install the quick-release mountings according
to the instructions below.
1. Only applies to 2WD machines; Lubricate
the shaft ends of the machine and the quick-
release mounting’s bearing surface with oil
before installation.
C
2. Install the quick-release mountings to the
D
machine according to the figures.
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3. Only applies to 2WD machines; Bend out the


cotter pin’s (A) leg along the periphery of the
shaft in order to secure it in the shaft.
4. Only applies to 4WD machines; Lubricate
the lubricating cup for the quick-release
mounting using a grease gun until grease
penetrates along the shaft sides.

6.3 Using the quick connections


Releasing the belt tension C
1. Remove the locking pins (C) from both sides.

2. Press down the rear section of the quick-


release mountings with your heel.
3. Carry out necessary corrective action, e.g.
setting the deck to the service position.

Tensioning the belt


First tension one side and then the other
according to the instructions below.
Use protective gloves when handling
the lever. Risk of crushing injuries.

1. Firmly grasp the lever (5:G) in front of the


centre of the shaft and carefully turn 180°
forwards.
2. Install the locking pin (C).
3. Carry out the above on the other side.
STIGA S.p.A - Via del Lavoro, 6 - 31033 Castelfranco Veneto (TV) - Italy
www.stiga.com

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