DURKOPP ADLER 827, 827-M Service Instructions Manual
827/827-M
Service Instructions
IMPORTANT
READ CAREFULLY BEFORE USE
KEEP FOR FUTURE REFERENCE
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Property of Dürkopp Adler AG and protected by copyright. Any reuse of these contents,
including extracts, is prohibited without the prior written approval of Dürkopp Adler AG.
Copyright © Dürkopp Adler AG 2019
Table of Contents
1 About these instructions ........................................................... 5
1.1 For whom are these instructions intended?.................................. 5
1.2 Representation conventions – symbols and characters............... 5
1.3 Other documents .......................................................................... 7
1.4 Liability.......................................................................................... 7
2 Safety........................................................................................... 9
2.1 Basic safety instructions ............................................................... 9
2.2 Signal words and symbols used in warnings.............................. 10
3 Working basis ........................................................................... 13
3.1 Order of the adjustments ............................................................ 13
3.2 Laying the cables........................................................................ 13
3.3 Removing the covers.................................................................. 14
3.3.1 Access to the underside of the machine..................................... 14
3.3.2 Disassembling and assembling the arm cover ........................... 15
3.3.3 Disassembling and assembling the head cover ......................... 16
3.3.4 Disassembling and assembling the valve cover......................... 17
3.3.5 Opening and closing the throat plate slide ................................. 18
3.3.6 Disassembling and assembling the throat plate ......................... 19
3.3.7 Disassembling and assembling the feed dog ............................. 20
3.4 Flats on shafts ............................................................................ 21
3.5 Locking the machine in place ..................................................... 22
3.6 Adjusting the handwheel into position ........................................ 23
4 Adjusting the handwheel scale ............................................... 25
5 Positioning the arm shaft......................................................... 26
6 Positioning the toothed belt wheels ....................................... 27
6.1 Positioning the upper toothed belt wheel.................................... 27
6.2 Positioning the lower toothed belt wheel .................................... 28
7 Stitch length adjusting wheel.................................................. 30
7.1 Adjusting the stitch length adjusting wheel................................. 30
7.2 Adjusting the stitch length limit ................................................... 32
7.3 Adjusting the eccentric for the forward and backward stitches... 33
8 Needle bar linkage.................................................................... 35
8.1 Aligning the needle bar linkage sideways................................... 35
8.2 Aligning the needle bar linkage in the sewing direction.............. 37
9 Adjusting the feed dog............................................................. 38
9.1 Adjusting the feed dog position .................................................. 38
9.1.1 Moving the feed dog on the feed dog carrier.............................. 38
9.1.2 Moving the feed dog carrier........................................................ 39
9.2 Adjusting the feed dog movement .............................................. 40
9.2.1 Adjusting the feed movement ..................................................... 40
9.2.2 Adjusting the feed dog height at top dead center....................... 41
9.2.3 Adjusting the stroke movement .................................................. 42
9.2.4 Adjusting the compensating weight ............................................ 43
Service Instructions 827/827-M - 01.0 - 05/2019 1
Table of Contents
10 Position of the hook and needle ............................................. 44
10.1 Adjusting the looping stroke position.......................................... 44
10.2 Adjusting the hook side clearance.............................................. 46
10.3 Adjusting the needle bar height .................................................. 47
10.4 Adjusting the needle guard......................................................... 48
11 Bobbin case lifter ..................................................................... 50
11.1 Adjusting the lifting gap .............................................................. 51
11.2 Adjusting the timing for opening ................................................. 52
11.3 Adjusting the sewing foot lifting height ....................................... 53
12 Needle thread tension .............................................................. 54
13 Winder ....................................................................................... 55
13.1 Adjusting the winder ................................................................... 55
13.2 Adjusting the hook thread guide ................................................. 58
14 Thread trimmer ......................................................................... 59
14.1 Adjusting the height of the thread-pulling knife........................... 59
14.2 Adjusting the cutoff curve ........................................................... 60
14.3 Adjusting the cutting pressure .................................................... 62
14.4 Adjusting point in time for cutting................................................ 63
15 Puller.......................................................................................... 65
15.1 Adjusting the synchronization of feed dog and puller ................. 66
15.2 Adjusting the distance between carrier roller and needle........... 68
15.3 Adjusting the carrier roller stroke................................................ 69
15.4 Adjusting the carrier roller pressure............................................ 70
15.5 Adjusting the fabric deflector ...................................................... 71
15.6 Adjusting the toothed belt tension .............................................. 72
15.7 Changing the carrier roller .......................................................... 73
16 Adjusting the potentiometer.................................................... 74
17 Safety release clutch................................................................ 76
17.1 Attaching the safety release clutch............................................. 76
17.2 Adjusting the torque.................................................................... 77
18 Integrated motor ....................................................................... 78
18.1 Overview of the components ...................................................... 78
18.2 Disassembling the drive ............................................................. 79
18.2.1 Disassembling the handwheel and handwheel flange................ 79
18.2.2 Disassembling the cover ............................................................ 79
18.2.3 Disassembling the encoder ........................................................ 80
18.2.4 Disassembling the stator ............................................................ 80
18.2.5 Disassembling the rotor .............................................................. 81
18.3 Assembling the drive .................................................................. 82
18.3.1 Assembling the rotor................................................................... 82
18.3.2 Assembling the stator ................................................................. 83
18.3.3 Assembling the encoder ............................................................. 84
18.3.4 Assembling the cover ................................................................. 84
18.3.5 Locking the machine in place ..................................................... 85
18.3.6 Assembling the handwheel flange.............................................. 86
18.3.7 Assembling the handwheel......................................................... 86
2 Service Instructions 827/827-M - 01.0 - 05/2019
Table of Contents
19 Programming ............................................................................ 87
19.1 Adjusting the electropneumatic switching of the carrier roller..... 91
19.2 Adjusting the stitch count before the carrier roller is lowered..... 92
20 Maintenance.............................................................................. 93
20.1 Cleaning ..................................................................................... 94
20.1.1 Cleaning the machine................................................................. 95
20.1.2 Cleaning the motor fan mesh ..................................................... 96
20.2 Lubricating .................................................................................. 97
20.2.1 Lubricating the machine head .................................................... 98
20.2.2 Adjusting the hook lubrication..................................................... 99
20.3 Servicing the pneumatic system............................................... 100
20.3.1 Adjusting the operating pressure.............................................. 100
20.3.2 Draining the water condensation .............................................. 101
20.3.3 Cleaning the filter element........................................................ 102
20.4 Checking the toothed belt......................................................... 103
20.5 Parts list.................................................................................... 103
21 Decommissioning................................................................... 105
22 Disposal................................................................................... 107
23 Troubleshooting ..................................................................... 109
23.1 Customer Service ..................................................................... 109
23.2 Messages of the software......................................................... 109
23.2.1 Information messages .............................................................. 109
23.2.2 Error Messages ........................................................................ 113
23.3 Errors in sewing process .......................................................... 115
24 Technical data......................................................................... 117
Service Instructions 827/827-M - 01.0 - 05/2019 3
Table of Contents
4 Service Instructions 827/827-M - 01.0 - 05/2019
About these instructions
1 About these instructions
These instructions have been prepared with utmost care. They contain
information and notes intended to ensure long-term and reliable operation.
Should you notice any discrepancies or if you have improvement requests,
then we would be glad to receive your feedback through Customer
Service ( p. 109).
Consider these instructions as part of the product and keep it easily
accessible.
1.1 For whom are these instructions intended?
These instructions are intended for:
With regard to minimum qualification and other requirements to be met
by personnel, please also follow the chapter Safety ( p. 9).
• Specialists:
This group has the appropriate technical training for performing
maintenance or repairing malfunctions.
1.2 Representation conventions – symbols and characters
Various information in these instructions is represented or highlighted
by the following characters in order to facilitate easy and quick
understanding:
Proper setting
Specifies proper setting.
Disturbances
Specifies the disturbances that can occur from an incorrect setting.
Cover
Specifies which covers must be disassembled in order to access the
components to be set.
Service Instructions 827/827-M - 01.0 - 05/2019 5
About these instructions
1.
2.
…
•
Steps to be performed when operating the machine (sewing and
equipping)
Steps to be performed for service, maintenance, and installation
Steps to be performed via the software control panel
The individual steps are numbered:
First step
Second step
The steps must always be followed in the specified order.
Lists are marked by bullet points.
Result of performing an operation
Change to the machine or on the display/control panel.
Important
Special attention must be paid to this point when performing a step.
Information
Additional information, e.g. on alternative operating options.
Order
Specifies the work to be performed before or after an adjustment.
References
Reference to another section in these instructions.
Safety Important warnings for the user of the machine are specifically marked.
Since safety is of particular importance, hazard symbols, levels of
danger and their signal words are described separately in the chapter
Safety ( p. 9).
Location
information
If no other clear location information is used in a figure, indications of right
or left are always from the user's point of view.
6 Service Instructions 827/827-M - 01.0 - 05/2019
About these instructions
1.3 Other documents
The machine includes components from other manufacturers. Each manufacturer has performed a hazard assessment for these purchased parts
and confirmed their design compliance with applicable European and national regulations. The proper use of the built-in components is described
in the corresponding manufacturer's instructions.
1.4 Liability
All information and notes in these instructions have been compiled in
accordance with the latest technology and the applicable standards and
regulations.
Dürkopp Adler cannot be held liable for any damage resulting from:
• Breakage and transport damages
• Failure to observe these instructions
• Improper use
• Unauthorized modifications to the machine
• Use of untrained personnel
• Use of unapproved parts
Transport
Dürkopp Adler cannot be held liable for breakage and transport damages.
Inspect the delivery immediately upon receiving it. Report any damage
to the last transport manager. This also applies if the packaging is not
damaged.
Leave machines, equipment and packaging material in the condition in
which they were found when the damage was discovered. This will ensure
any claims against the transport company.
Report all other complaints to Dürkopp Adler immediately after receiving
the product.
Service Instructions 827/827-M - 01.0 - 05/2019 7
About these instructions
8 Service Instructions 827/827-M - 01.0 - 05/2019
Safety
2 Safety
This chapter contains basic information for your safety. Read the instructions carefully before setting up or operating the machine. Make sure to
follow the information included in the safety instructions. Failure to do so
can result in serious injury and property damage.
2.1 Basic safety instructions
The machine may only be used as described in these instructions.
These instructions must be available at the machine's location at all times.
Work on live components and equipment is prohibited. Exceptions are
defined in the DIN VDE 0105.
For the following work, switch off the machine at the main switch or
disconnect the power plug:
• Replacing the needle or other sewing tools
• Leaving the workstation
• Performing maintenance work and repairs
• Threading
Missing or faulty parts could impair safety and damage the machine.
Only use original parts from the manufacturer.
Transport Use a lifting carriage or stacker to transport the machine. Raise the
machine max. 20 mm and secure it to prevent it from slipping off.
Setup The connection cable must have a power plug approved in the relevant
country. The power plug may only be assembled to the connection cable
by qualified specialists.
Obligations
of the operator
Follow the country-specific safety and accident prevention regulations and
the legal regulations concerning industrial safety and the protection of
the environment.
All the warnings and safety signs on the machine must always be in legible
condition. Do not remove!
Missing or damaged warnings and safety signs must be replaced
immediately.
Requirements
to be met by
the personnel
Only qualified specialists may:
• Setting up the machine
• Performing maintenance work and repairs
• Performing work on electrical equipment
Only authorized persons may work on the machine and must first have
understood these instructions.
Service Instructions 827/827-M - 01.0 - 05/2019 9
Safety
Operation Check the machine during operating for any externally visible damage.
Stop working if you notice any changes to the machine. Report any changes to your supervisor. Do not use a damaged machine any further.
Safety
equipment
Safety equipment should not be disassembled or deactivated. If it is
essential to disassemble or deactivate safety equipment for a repair
operation, it must be assembled and put back into operation immediately
afterward.
2.2 Signal words and symbols used in warnings
Warnings in the text are distinguished by color bars. The color scheme is
based on the severity of the danger. Signal words indicate the severity
of the danger.
Signal words Signal words and the hazard they describe:
Signal word Meaning
DANGER (with hazard symbol)
If ignored, fatal or serious injury will result
WARNING (with hazard symbol)
If ignored, fatal or serious injury can result
CAUTION (with hazard symbol)
If ignored, moderate or minor injury can result
CAUTION (with hazard symbol)
If ignored, environmental damage can result
NOTICE (without hazard symbol)
If ignored, property damage can result
Symbols The following symbols indicate the type of danger to personnel:
Symbol Type of danger
General
Electric shock
10 Service Instructions 827/827-M - 01.0 - 05/2019
Safety
Symbol Type of danger
Puncture
Crushing
Environmental damage
Examples Examples of the layout of warnings in the text:
DANGER
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that will result in serious
injury or even death if ignored.
WARNING
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
serious or even fatal injury if ignored.
CAUTION
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
moderate or minor injury if the warning is ignored.
Service Instructions 827/827-M - 01.0 - 05/2019 11
Safety
CAUTION
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
environmental damage if ignored.
NOTICE
Type and source of danger!
Consequences of non-compliance.
Measures for avoiding the danger.
This is what a warning looks like for a hazard that could result in
property damage if ignored.
12 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
3 Working basis
3.1 Order of the adjustments
Order
The adjustment positions for the machine are interdependent.
Always comply with the order of individual adjustment steps as specified.
It is absolutely essential that you follow all notices regarding prerequisites
and subsequent adjustments that are marked with in the margin.
NOTICE
Property damage may occur!
Risk of machine damage from incorrect order.
It is essential to follow the working order specified in these
instructions.
3.2 Laying the cables
Ensure that all cables are laid in the machine such that the function of
moving parts is not hampered.
To lay the cables:
1. Lay any excess cabling neatly in proper cable snakes.
2. Bind together the cable loops with cable ties.
Important
Tie loops wherever possible to fixed parts.
The cables must be secured firmly.
3. Cut off any overlapping cable ties.
NOTICE
Property damage may occur!
Excess cables can impair the functioning of moving machine parts.
This impairs the sewing function and can result in damage.
Lay excess cable as described above.
Service Instructions 827/827-M - 01.0 - 05/2019 13
Working basis
3.3 Removing the covers
WARNING
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Switch off the machine before removing or
assembling covers.
For many types of adjustment work, you will have to remove the machine
covers first in order to access the components.
This chapter describes how to remove and then assemble the individual
covers again. The text for each type of adjustment work then specifies only
the cover that needs to be removed at that particular time.
3.3.1 Access to the underside of the machine
Cover
To access the components on the underside of the machine, you must tilt
the machine head.
Fig. 1: Access to the underside of the machine
Tilting the machine head
To tilt the machine head:
1. Tilt the machine head as far as it will go.
Erecting the machine head
To erect the machine head:
1. Erect the machine head.
14 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
③
①②
3.3.2 Disassembling and assembling the arm cover
Fig. 2: Disassembling and assembling the arm cover
(1) - Screws
(2) - Arm cover
(3) - Sewing foot stroke adjusting wheel
Disassembling the arm cover
To remove the arm cover:
1. Turn the adjusting wheel for the sewing foot stroke (3) to 2.
2. Loosen the screws (1).
3. Disassemble the arm cover (2).
Assembling the arm cover
To assemble the arm cover:
1. Turn the adjusting wheel for the sewing foot stroke to 2.
2. Assemble the arm cover (2).
3. Tighten the screws (1).
Service Instructions 827/827-M - 01.0 - 05/2019 15
3.3.3 Disassembling and assembling the head cover
①
②
Fig. 3: Disassembling and assembling the head cover
Working basis
(1) - Screws (2) - Head cover
Disassembling the head cover
To disassemble the head cover:
1. Loosen the screws (1).
2. Disassemble the head cover (2).
Assembling the head cover
To assemble the head cover:
1. Assemble the head cover (2).
2. Tighten the screws (1).
16 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
②
①
3.3.4 Disassembling and assembling the valve cover
Fig. 4: Disassembling and assembling the valve cover
(1) - Screws (2) - Valve cover
Disassembling the valve cover
To disassemble the valve cover:
1. Loosen the screws (1).
2. Disassemble the valve cover (2).
Important
When disassembling the cover, make sure not to tear off any cables.
Assembling the valve cover
To assemble the valve cover:
1. Assemble the valve cover (2).
2. Tighten the screws (1).
Important
When assembling the cover, make sure not to pinch any cables.
Service Instructions 827/827-M - 01.0 - 05/2019 17
3.3.5 Opening and closing the throat plate slide
③
①
②
Fig. 5: Opening and closing the throat plate slide
Working basis
(1) - Throat plate slide
(2) - Throat plate
Opening the throat plate slide
To open the throat plate slide:
1. Press the clamping spring (3) downwards.
2. Push the throat plate slide (1) apart.
Closing the throat plate slide
To close the throat plate slide:
1. Screw the throat plate slide (1) to the throat plate (2).
(3) - Clamping spring
18 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
②③
①
①
3.3.6 Disassembling and assembling the throat plate
Fig. 6: Disassembling and assembling the throat plate
(1) - Screws
(2) - Throat plate
Disassembling the throat plate
To disassemble the throat plate:
1. Open the throat plate slide ( p. 18).
2. Loosen the screws (1).
3. Disassemble the throat plate (2).
Assembling the throat plate
To assemble the throat plate:
1. Insert the throat plate (2).
Ensure that the bobbin case nose (3) is in the cutout of the throat plate.
2. Tighten the screws (1).
3. Close the throat plate slide.
(3) - Bobbin case nose
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3.3.7 Disassembling and assembling the feed dog
③
②
①
②
WARNING
Risk of injury from sharp and moving parts!
Puncture or crushing possible.
Switch off the machine before you disassemble or
assemble the feed dog.
Fig. 7: Disassembling and assembling the feed dog
Working basis
(1) - Feed dog
(2) - Screws
Disassembling the feed dog
To disassemble the feed dog:
1. Disassemble the throat plate ( p. 19).
2. Loosen the screws (2).
3. Disassemble the feed dog (1) from the feed dog carrier (3).
Assembling the feed dog
To assemble the feed dog:
1. Assemble the feed dog (1) onto the feed dog carrier (3).
2. Tighten the screws (2).
3. Assemble the throat plate ( p. 19).
Important
Check the feed dog position in motion and with the stitch length at its
maximum by turning the handwheel. The feed dog must not hit against
the throat plate.
(3) - Feed dog carrier
20 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
Order
Then check the following adjustment:
• Feed dog ( p. 38)
3.4 Flats on shafts
Fig. 8: Flats on shafts
1
2
(1) - Flat (2) - Shaft
Some shafts have flat surfaces at the points where the components are
screwed on. This stabilizes the connection and makes adjustment easier.
For all adjustments on the surface, the first screw in the direction of
rotation is screwed onto the surface.
Important
Always ensure that the screw faces are completely flush with the surface.
Service Instructions 827/827-M - 01.0 - 05/2019 21
Working basis
①②
3.5 Locking the machine in place
For some adjustments, the machine must be locked in place. To do this,
the locking peg (3) from the accessory pack is inserted into a slot on the
arm shaft crank, blocking the arm shaft.
Fig. 9: Locking the machine in place
(3) - Locking opening (3) - Locking peg
Locking the machine in place
To lock the machine in place:
1. Remove the plug from the locking opening (1).
2. Turn the handwheel until the slot is in front of the locking opening (1).
3. Insert the locking peg (2) into the slot.
Removing the lock
To remove the lock:
1. Pull the locking peg (2) out of the slot.
2. Insert the plug into the locking opening (1).
22 Service Instructions 827/827-M - 01.0 - 05/2019
Working basis
①
②
3.6 Adjusting the handwheel into position
Fig. 10: Adjusting the handwheel into position
(1) - Graduated scale (2) - Marking
For some adjustments, the graduated scale (1) on the handwheel has to
be moved to a certain position.
To adjust the handwheel into position:
1. Turn the handwheel until the specified number on the graduated
scale (1) is next to the marking (2).
Service Instructions 827/827-M - 01.0 - 05/2019 23
Working basis
24 Service Instructions 827/827-M - 01.0 - 05/2019
Adjusting the handwheel scale
①
②
4 Adjusting the handwheel scale
Proper setting
1. Lock the machine in place at position 2 ( p. 22).
The handwheel is at position 0°.
If a different degree number is next to the marking (2), then you will
have to reset the graduated scale.
Fig. 11: Adjusting the handwheel scale
(1) - Screw opening (2) - Marking
To adjust the handwheel scale:
1. Lock the machine in place at position 2 ( p. 22).
2. Loosen the fastening screw for the handwheel through the screw
opening (1).
3. Turn the handwheel so that the marking (2) points to the degree
number 0°.
4. Tighten the fastening screw.
5. Turn the handwheel to 50° and tighten the 2
nd
fastening screw.
Service Instructions 827/827-M - 01.0 - 05/2019 25
5 Positioning the arm shaft
①
②
③
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before you check and set
the position of the arm shaft crank.
Fig. 12: Positioning the arm shaft
Positioning the arm shaft
(1) - Threaded pins
(2) - Machine casting
Proper setting
The 3 threaded pins (1) on the arm shaft crank (3) are seated completely
on the flat. The arm shaft crank (3) is flush with the machine casting (2)
To position the arm shaft:
1. Disassemble the arm cover ( p. 17).
2. Loosen the threaded pins (1).
3. Turn the arm shaft crank (3) such that the threaded pins (1) are seated
completely on the flat of the arm shaft.
4. Push the arm shaft with the arm shaft crank (3) to the right as far as it
will go and flush with the machine casting.
5. Tighten the threaded pins (1).
(3) - Arm shaft crank
26 Service Instructions 827/827-M - 01.0 - 05/2019
Positioning the toothed belt wheels
⑤
①
②
③④
6 Positioning the toothed belt wheels
Proper setting
The two toothed belt wheels must be positioned above each other so that
the toothed belt can run correctly. The winder wheel is directly next to the
upper toothed belt wheel and determines its alignment.
Important
The position of the upper toothed belt wheel is defined by the distance to
the winder wheel.
Therefore, you must first align the upper toothed belt wheel on the winder
wheel and then align the lower toothed belt wheel so that the toothed belt
runs correctly over both wheels.
WARNING
Risk of injury from moving parts!
Crushing possible.
Switch off the machine before positioning the
toothed belt wheels.
6.1 Positioning the upper toothed belt wheel
Fig. 13: Positioning the upper toothed belt wheel
(1) - Upper toothed belt wheel
(2) - Threaded pins
(3) - Winder wheel
Proper setting
The 2 threaded pins (2) for the upper toothed belt wheel (1) are seated
flush on the arm shaft (5).
The distance between the winder wheel (3) and the upper toothed belt
wheel (1) must be 0.8 mm.
The toothed belt (4) runs correctly without running against the snap ring or
slipping off.
Service Instructions 827/827-M - 01.0 - 05/2019 27
(4) - Toothed belt
(5) - Flat of arm shaft
Positioning the toothed belt wheels
①
②
④
③
To position the upper toothed belt wheel:
1. Disassemble the arm cover ( p. 17).
2. Push the toothed belt (4) sufficiently far to the side so that the
2 threaded pins (2) can be reached.
3. Loosen the threaded pins (2).
4. Turn the upper toothed belt wheel (1) so that the threaded pins(2)
are seated flush on the flat of the arm shaft (5).
5. Move the upper toothed belt wheel (1) to the side so that the distance
to the winder wheel (3) is 0.8 mm.
6. Tighten the threaded pins (2).
7. Push the toothed belt (4) back.
6.2 Positioning the lower toothed belt wheel
Fig. 14: Positioning the lower toothed belt wheel
(1) - Toothed belt
(2) - Snap ring
Proper setting
The 2 threaded pins for the lower toothed belt wheel (3) are seated flush
on the flat of the lower shaft.
The toothed belt (1) runs correctly without running against the snap
ring (2) or slipping off.
To position the lower toothed belt wheel:
1. Tilt the machine head ( p. 14).
2. Loosen the threaded pins (4).
3. Turn the lower toothed belt wheel (3) such that the threaded pins (4)
are seated on the flat of the arm shaft.
(3) - Lower toothed belt wheel
(4) - Threaded pins
28 Service Instructions 827/827-M - 01.0 - 05/2019
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