Stiga Mower Decks
Stiga Mower Decks
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
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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.
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.
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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.
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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.
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).
                                                        I
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Park 4WD
  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).
  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.
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                                                               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.
                                                           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
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.
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.
   Park 2WD:
                                                                 Park 2WD
   Remove the tensioner from the belt.
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.
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.
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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.
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.
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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.
                                                         I
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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.
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                                                      12 mm head
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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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                                                                      80/70 N
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12 mm head
                                                           24 Nm
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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.
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.
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.
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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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.
Assembly
      Note!
      According the blades, see "Replacement
                                                                       H
      of blades" at page 28.
      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.
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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                                                                             B
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  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.
   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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16”
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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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
      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