Stryker 4850 Manual

2015/09 G.1 4850-009-001 REV G www.stryker.com
Michael Graves with Stryker
Patient Chairs and Ottoman
Michael Graves en collaboration avec Stryker
Pour les fauteuils de patient et repose-pieds
Operations/Maintenance Manual
Manuel d’utilisation et d’entretien
4850
4851
4852
4853
4854
4855
4856
4857

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English
Table of Contents
Symbols and Definitions ...................................................................1-2
Symbols ...........................................................................1-2
Warning/Caution/Note Definition ..........................................................1-2
Introduction ............................................................................1-3
Intended Use ........................................................................1-3
Product Description ...................................................................1-3
Specifications .......................................................................1-4
Contact Information ...................................................................1-5
Serial Number Location ................................................................1-5
Product Illustration ....................................................................1-6
Summary of Safety Precautions .............................................................1-7
Operation Guide.........................................................................1-9
Stowing the Ottoman ..................................................................1-9
Preventative Maintenance.................................................................1-10
Checklist ..........................................................................1-10
Cleaning..............................................................................1-1 1
Fabric Cleaning and Maintenance .......................................................1-1 1
Frame and Arm Cleaning ..............................................................1-14
Quick Reference Replacement Parts List .....................................................1-15
Service Information......................................................................1-16
Leg Glide Replacement (All Models)......................................................1-16
Chair Back Replacement (For Models 4850, 4851, 4852, 4853, and 4854)..........................1-17
Chair Back Replacement (For Models 4855 and 4856) ........................................1-18
Seat Cushion Replacement (All Models) ...................................................1-19
Model 4850 - Patient Chair, Lowback, Armless .................................................1-20
Model 4851 - Patient Chair, Lowback, Low Seat ................................................1-21
Model 4852 - Patient Chair, Lowback 22”, High Seat .............................................1-22
Model 4853 - Patient Chair, Highback, Low Seat ................................................1-23
Model 4854 - Patient Chair, Highback 22”, High Seat.............................................1-24
Model 4855 - Patient Chair, Comfort-Flex, Low Seat .............................................1-25
Model 4856 - Patient Chair, Comfort-Flex 22”, High Seat ..........................................1-27
Model 4857 - Ottoman . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-29
Warranty .............................................................................1-30
Limited Lifetime Warranty..............................................................1-30
To Obtain Parts and Service ...........................................................1-30
Return Authorization..................................................................1-3 0
Damaged Merchandise ...............................................................1-30
International Warranty Clause...........................................................1-30

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Symbols and Definitions
SYMBOLS
Warning/Caution: Consult accompanying documentation
Safe Working Load
Pinch Point
Manufacturer
WARNING/CAUTION/NOTE DEFINITION
The words WARNING, CAUTION and NOTE carry special meanings and should be carefully reviewed.
WARNING
Alerts the reader about a situation which, if not avoided, could result in death or serious injury. It may also describe
potential serious adverse reactions and safety hazards.
CAUTION
Alerts the reader of a potentially hazardous situation which, if not avoided, may result in minor or moderate injury to the
user or patient or damage to the equipment or other property. This includes special care necessary for the safe and
effective use of the device and the care necessary to avoid damage to a device that may occur as a result of use or
misuse.
NOTE
Provides special information to make maintenance easier or important instructions clearer.

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Introduction
This manual is designed to assist you with the operation of Michael Graves with Stryker Patient Chairs and Ottoman.
Read this manual thoroughly before using the equipment or beginning maintenance on it. To ensure safe operation of
this equipment, it is recommended that methods and procedures be established for educating and training staff on the
safe operation of this unit.
INTENDED USE
The Michael Graves with Stryker Patient Chairs and Ottoman are intended for pediatric and adult person guest and
patient seating use in an indoor medical setting. These products are not intended for infant use or the placement of
infant carriers.
The product line consists of chairs without wheels and not electrically powered which, by reason of special shape arms,
assist in the ingress or egress of patients, or patients undergoing treatment or examination:
• Model 4851 – Michael Graves with Stryker Lowback Patient Chair
• Model 4852 – Michael Graves with Stryker Lowback 22” Seat Height Patient Chair
• Model 4853 – Michael Graves with Stryker Highback Patient Chair
• Model 4854 – Michael Graves with Stryker Highback 22” Seat Height Patient Chair
• Model 4855 – Michael Graves with Stryker Comfort-Flex Patient Chair
• Model 4856 – Michael Graves with Stryker Comfort-Flex 22” Seat Height Patient Chair
In addition, the product line consists of a chair without arms, without wheels and not electrically powered:
• Model 4850 – Michael Graves with Stryker Armless Patient Chair
Furthermore, the product line consists of an ottoman for foot rest and auxiliary seating use without wheels and not
electronically powered and stowable under aforementioned chair models:
• Model 4857 – Michael Graves with Stryker Ottoman
Expected use of the units would have the patient seated on the provided cushioning of the chair, not sitting on the
arms, not leaning on arms or chair back while in a standing position, and not standing on the chair seat or ottoman.
For Comfort-Flex (models 4855 and 4856), patients with restriction of fore/aft rocking should not be placed in this unit.
Under typical use, the Michael Graves with Stryker Patient Chairs and Ottoman have an expected life of 10 years and
weight capacity of 300 lb (136 kg). One use is defined as an ingress and egress event. Typical use is defined as two
uses per day.
PRODUCT DESCRIPTION
The Michael Graves with Stryker Patient Chairs are designed to aid in nose-over-toes positioning. The noteworthy
aesthetics of this new patient chair pave the way for superior functionality. The chair is available armless or with arms
offering two seat heights with lowback, highback, or Comfort-Flex configurations. An ottoman is also available for foot
rest and additional seating.

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SPECIFICATIONS
Note: All dimensions are rounded to the nearest .5 in.
4850
Armless
4851
Lowback
4852
Lowback 22”
4853
Highback
Safe Working Load 300 lb (136 kg) 300 lb (136 kg) 300 lb (136 kg) 300 lb (136 kg)
Overall Width 22 in (56 cm) 26.5 in (67 cm) 26.5 in (67 cm) 26.5 in (67 cm)
Overall Height 35 in (89 cm) 35 in (89 cm) 39.5 in (100 cm) 43 in (109 cm)
Overall Depth 28 in (71 cm) 30.5 in (77.5 cm) 30.5 in (77.5 cm) 31.5 in (80 cm)
Seat Height from Floor 19 in (48 cm) 19 in (48 cm) 23.5 in (60 cm) 19 in (48 cm)
Seat Depth 20 in (51 cm) 20 in (51 cm) 20 in (51 cm) 20 in (51 cm)
Back Height from Seat 17 in (43 cm) 17 in (43 cm) 17 in (43 cm) 25.5 in (65 cm)
Arm Height from Floor
(at mid point seat depth) Not applicable 26 in (66 cm) 30 in (76 cm) 26 in (66 cm)
4854
Highback 22”
4855
Comfort-Flex
4856
Comfort-Flex 22”
4857
Ottoman
Safe Working Load 300 lb (136 kg) 300 lb (136 kg) 300 lb (136 kg) 300 lb (136 kg)
Overall Width 26.5 in (67 cm) 26.5 in (67 cm) 26.5 in (67 cm) 18.5 in (47 cm)
Overall Height 47 in (119.5 cm) 43 in (109 cm) 47 in (119.5 cm) 13 in (33 cm)
Overall Depth 31.5 in (80 cm) 31.5 in (80 cm) 31.5 in (80 cm) 17.5 in (44.5 cm)
Seat Height from Floor 23.5 in (60 cm) 19 in (48 cm) 23.5 in (60 cm) Not applicable
Seat Depth 20 in (51 cm) 20 in (51 cm) 20 in (51 cm) Not applicable
Back Height from Seat 25.5 in (65 cm) 25 in (63.5 cm) 25 in (63.5 cm) Not applicable
Arm Height from Floor
(at mid point seat depth) 30 in (76 cm) 26 in (66 cm) 30 in (76 cm) Not applicable
Stryker reserves the right to change specifications without notice.
Introduction

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Introduction
CONTACT INFORMATION
Contact Stryker Customer Service or Technical Support at [phone].
Stryker Medical
3800 E. Centre Avenue
Portage, MI 49002
USA
Please have the serial number of your Stryker product available when
calling Stryker Customer Service or Technical Support. Include the
serial number in all written communication.
SERIAL NUMBER LOCATION
The serial number (A) for your chair is located on the back of the
frame bar under the chair seat (Figure 1) on the content label (Figure
2).
SERIAL NUMBER
CARB INFO
DATE
STRYKER SKU
FABRIC INFO
SERIAL NUMBER
Figure 2: Content Label - Located on Bottom of Seat Cushion
A
Figure 1: Serial Number Location
A

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Introduction
PRODUCT ILLUSTRATION
Chair Back
Chair Seat
Chair Arm
Ottoman Seat
Ottoman Leg
Glides
Plastic Cap
Figure 3: Product Illustration

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WARNING
• To avoid the risk of serious injury or product damage, do not stand on chair seat or ottoman.
• To avoid the risk of serious injury or product damage, do not sit on chair arms.
• To avoid the risk of serious injury or product damage, while standing behind the chair, do not lean on chair backrest
or chair arms.
• To avoid the risk of serious injury or product damage, keep all four chair legs on the ground when seated.
• To avoid the risk of serious injury or product damage, do not lay infants or infant carriers in the chair or on the
ottoman.
• To avoid the risk of serious injury, for Comfort-Flex chairs only, do not place patients with restriction of fore/aft
rocking in this unit.
• If punctures or tears are present in the chair arms, upholstered chair seat frame assembly, upholstered chair back,
upholstered chair back panel, or upholstered ottoman assembly, replace the assembly or component as this could
lead to biocontamination.
• For armless chairs, do not use if plastic caps are missing as this could lead to biocontamination.
• Stow the ottoman under the chair when not in use to avoid a tripping hazard.
• Failure to properly clean a contaminated surface will increase the risk of exposure to bloodborne pathogens.
CAUTION
• To avoid the risk of ottoman upholstery damage, with Comfort-Flex chairs only, do not force the ottoman back into
the chair frame components.
• To avoid the risk of product or floor damage, do not use chairs and/or ottoman if all glides are not present.
• Use a soft, white cloth to clean stained or soiled areas. Avoid use of paper towels.
• Cleaning products may be harmful to your skin and/or eyes. Use protective gloves and eye protection. Protect the
surrounding area and clothing from exposure to cleaners. Do not inhale or swallow any cleaning agents. Follow
all cleaning product manufacturer’s warnings.
• The use of certain agents can be harmful to the surface appearance and lifespan of fabrics. Check compatibility
of any cleaning product with other surfaces on the furniture, such as painted surfaces or varnish.
• Clean all stains immediately as some stains may become permanent if not removed quickly.
• This information is not a guarantee and does not relieve the user from the responsibility of the proper and safe use
of these fabrics and all cleaning agents.
• To avoid the risk of equipment damage to the new back panel, make sure that each push rivet is aligned with each
T-nut prior to installation.
• When cleaning vinyl fabrics, the use of conditioners or protectants is not recommended and should be avoided.
• The use of quaternary cleaners that contain diethylene glycol butyl ether or alcohol to the underside surfaces of
the chair and ottoman may result in compromised legibility of the pre-printed labels. Should this occur, see “Product
LabelsProduct Labels” on page 1-11 for the original label text.
Summary of Safety Precautions

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Figure 4: Comfort-Flex Pinch Points
Summary of Safety Precautions
• A preventative maintenance program should be established for all equipment. Preventative maintenance may need
to be performed more frequently based on the usage level of the product. For additional maintenance information,
see the “Checklist” on page 1-10.
• Improper maintenance can cause injury or damage to the product. Maintain the unit as described in this manual.
Use only Stryker approved parts and maintenance procedures. Using unapproved parts and procedures could
cause unpredictable operation and/or injury and will void the product warranty (see “Warranty” on page 1-30).
• When using the Comfort-Flex models 4855 and 4856, keep extremities away from identified locations as shown in
Figure 4 as potential pinch points exist, which may result in minor or moderate injury.
CAUTION (CONTINUED)

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STOWING THE OTTOMAN
WARNING
Stow the ottoman under the chair when not in use to avoid a tripping hazard.
For model 4851, 4852, 4853, 4854, 4855, and
4856 only, stow the ottoman laterally under the
chair from the front when not in use as shown in
Figure 5.
CAUTION
To avoid the risk of ottoman upholstery damage,
with Comfort-Flex chairs only, do not force the
ottoman back into the chair frame components.
For models 4850 only, stow the ottoman rotated
under the chair from the front when not in use as
shown in Figure 6.
Operation Guide
Figure 6: Stow the Ottoman Rotated (as shown) -
Model 4850 Only
Figure 5: Stow the Ottoman Laterally (as shown) -
Models 4851, 4852, 4853, 4854, 4855 and 4856 Only

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English Preventative maintenance should be performed at a minimum of annually. A preventative maintenance program should
be established for all Stryker Medical equipment. Preventative maintenance may need to be performed more frequently
based on the usage level of the product.
CHECKLIST
_____ All fasteners secure and intact
_____ All foot glides secure and intact to prevent floor damage
_____ All chair backs and seat cushions secure and intact
_____ Both arms are secure and intact
_____ All welds (metal frames) are secure and intact
_____ No punctures or tears in the chair arms, upholstered chair seat frame assembly, upholstered chair back, upholstered
chair back panel, or upholstered ottoman assembly
_____ All plastic caps are secure and intact (armless chairs only)
_____ Comfort-Flex mechanism is functional and moves smoothly (Comfort-Flex chairs only)
_____ Check labels as specified in the Operations/Maintenance manual for legibility, proper adherence and integrity
CAUTION
• A preventative maintenance program should be established for all equipment. Preventative maintenance may need
to be performed more frequently based on the usage level of the product.
• Improper maintenance can cause injury or damage to the product. Maintain the unit as described in this manual.
Use only Stryker approved parts and maintenance procedures. Using unapproved parts and procedures could cause
unpredictable operation and/or injury and will void the product warranty (see “Warranty” on page 1-30).
Unit Serial Number:
Completed by: ____________________________________________ Date: _____________________
Preventative Maintenance

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FABRIC CLEANING AND MAINTENANCE
WARNING
Failure to properly clean a contaminated surface will increase the risk of exposure to bloodborne pathogens.
Follow these instructions to ensure that you are cleaning your Stryker Medical fabrics (vinyl, PVC-Free, PVC-Free with
Agion®, Crypton®, Crypton®Green, or Woven Agion®) thoroughly and safely. Deviating from these instructions may
cause damage to the material and hinder its performance.
CAUTION
• Use a soft, white cloth to clean stained or soiled areas. Avoid use of paper towels.
• Cleaning products may be harmful to your skin and/or eyes. Use protective gloves and eye protection. Protect the
surrounding area and clothing from exposure to cleaners. Do not inhale or swallow any cleaning agents. Follow
all cleaning product manufacturer’s warnings.
• The use of certain agents can be harmful to the surface appearance and lifespan of fabrics. Check compatibility
of any cleaning product with other surfaces on the furniture, such as painted surfaces or varnish.
• Clean all stains immediately as some stains may become permanent if not removed quickly.
• This information is not a guarantee and does not relieve the user from the responsibility of the proper and safe use
of these fabrics and all cleaning agents.
Vinyl
Clean all stains as quickly as possible and use the following cleaning procedures in order for best results.
CAUTION
When cleaning vinyl fabrics, the use of conditioners or protectants is not recommended and should be avoided.
Cleaning Protocol A (see table on page 1-12):
• Remove excess spill with a damp, clean cloth. Clean with a 10 percent mixture of liquid soap and warm water.
Rinse with water and dry.
• For stubborn stains, use a straight application of commercially available butyl-based water solvent cleaner. Wipe
with a clean cloth. Rinse with water and dry.
• If the stain persists, use a 1 to 1 mixture of isopropyl alcohol and water. Rinse thoroughly with water and then pat
dry with a clean, lint-free cloth. If the stain persists after six attempts, then the stain has set and probably cannot
be removed.
• For more stubborn or difficult stains, use a 9 to 1 mixture of bleach and water (10 percent bleach to 90 percent
water mixture). Rinse with water and dry. If the stain persists, use a clean cloth saturated with the diluted cleaning
material and rub the stain in a circular motion. Pat dry with a different clean cloth. Repeat, if necessary.
Cleaning Protocol B (see table on page 1-12):
• Remove excess spill with a damp, clean cloth. Clean with a 10 percent mixture of liquid soap and warm water.
Rinse with water and dry.
• For stubborn stains, apply a solution of liquid cleanser and water with a soft brush. Wipe away the residue with
a damp, clean cloth. Dampen a white, clean cloth with a solution of household bleach (10 percent bleach to
90 percent water mixture). Rub gently. Rinse with a damp, clean cloth to remove the bleach concentration.
• If the stain persists, allow a 1 to 10 diluted mixture of bleach and water to puddle on the affected area or apply
with a damp, clean cloth for approximately 30 minutes. Rinse with a damp, clean cloth to remove any remaining
bleach concentration.
Cleaning

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English FABRIC CLEANING AND MAINTENANCE (CONTINUED)
Suggested Vinyl Cleaning Protocols:
Follow the cleaning instructions for protocol A or protocol B, as described on page 1-11, for the pattern as shown
below.
Cleaning
Pattern Protocol A Protocol B
Abacus X
Aspen X
Avant X
Banyan X
Bari X
Bistro X
Bon Voyage X
Capreni X
Carlisle X
Casablanca X
Checkmate X
Chroma X
Cirque X
Dash X
Dodge Ball X
Facet X
Geomet X
Juxy X
Laredo X
Lava X
Martini X
Pattern Protocol A Protocol B
Matrix X
Natural World X
Oakwood X
Olympus X
Oxford X
Petals X
Prisma X
Raffia X
Rally X
Rialto X
Rivera X
Script X
Shantung X
Smile X
Southampton X
Tendril X
Tessuto X
Walk the Line X
Whitney X
Ybor X
Ziggy X

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FABRIC CLEANING AND MAINTENANCE (CONTINUED)
PVC-Free and PVC-Free with Agion®
Clean all stains as quickly as possible and use the following cleaning procedures in order for best results.
• Remove any excess spills with a damp, clean cloth. Clean with a 10 percent mixture of liquid soap and warm water.
Rinse with water and dry.
• For stubborn stains, use a 1 to 1 mixture of a commercially available butyl-based water solvent cleaner and water.
Rinse with water. Wipe with a clean cloth.
• For more difficult stains, use a 5 to 1 mixture of water and bleach solution (5 parts water to 1 part bleach mixture).
Rinse with water and dry. Never use bleach in full strength to clean and/or disinfect PVC-free products.
Note: Use a soft brush or clean cloth saturated with cleaning material. Always test cleaning methods on an inconspicuous
area of furniture.
Crypton®and Crypton Green®
To prevent overall soiling, vacuum regularly or brush lightly to remove dirt, dust, and grime is recommended. Spot clean
using the foam from a water-based cleaning agent such as a mild detergent or non-solvent upholstery shampoo. Apply
foam with a soft rag or brush in a circular motion. Vacuum when dry. Always pretest a small area before proceeding.
Remove all soil and spills as quickly as possible.
• Wipe up any spills before they dry using a clean cloth.
• If stain has dried, lightly brush or scrape off the residual and wipe with a wet towel.
• If stain remains, clean fabric with an enzymatic detergent mixed with water (5 parts water with 1 part enzyme
detergent mixture). Scrub the area for one minute using a soft nylon brush. Rinse with water leaving no residue.
Dry with a clean cloth.
• Repeat if necessary.
Do not use solvent based cleaners as they may harm the fabric.
Woven Agion®
You can use water-based cleaning agents and foam for cleaning Woven Agion®. You can also clean with mild, water-
free solvents. Cleaning by a professional service is recommended.
• For easy cleaning of recent soiling, most stains can be wiped off with a clean cloth.
• For stubborn stains, clean with a 10 percent mixture of liquid soap and warm water. Apply diluted cleaning solution
to a clean cloth or soft brush. Moisten a clean cloth with clear water and revisit stain to wipe off and rinse. Let
air dry.
• For more stubborn or difficult stains, use a mild solvent cleaner mixed with water. Rinse with water. Wipe with
clean cloth.
• If the stain persists, use a 1 to 5 mixture of bleach solution and water (1 part bleach to 5 parts water mixture) with
a maximum of 20 percent bleach. Blot stain with a clean cloth saturated in the diluted bleach mixture. Rinse stain
area with a damp, clean cloth and let dry. Bleach solutions not completely removed could fade the fabric. Never
use bleach in full strength to clean these fabrics.
Note: Use a soft brush or cloth saturated with cleaning material. Test cleaning methods on an inconspicuous area of
the furniture. If the stain persists, then the stain has probably set. Although these fabrics are resistant to most common
stains, some agents, such as ink, can create a permanent stain. Clean all stains as quickly as possible.
Cleaning

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Cleaning
FRAME AND ARM CLEANING
Cleaners for frame and arm cleaning include:
• Quaternary (active ingredient - ammonium chloride)
• Phenolic (active ingredient - o-phenylphenol)
• Alcohol-based (maximum 70 percent alcohol content)
• Bleach (1 part bleach to 100 parts water)
A recommended cleaner is a chlorinated bleach solution (less than 1 part bleach to 100 parts water mixture). For
example, a 6 percent bleach solution diluted to 165 milliliter of bleach solution per 1 liter of water or 20 ounces of
bleach solution per 1 gallon of water. Thoroughly rinse the solution from the product surface. If other hospital-grade
cleaning agents listed above are used, follow the instructions provided by the cleaning solution’s manufacturer. Do
not allow cleaning solutions or other fluids to pool on the unit. Wipe the surface with a dry, clean cloth to remove any
moisture.
CAUTION
The use of quaternary cleaners that contain diethylene glycol butyl ether or alcohol to the underside surfaces of
the chair and ottoman may result in compromised legibility of the pre-printed labels. Should this occur, see “Product
LabelsProduct Labels” on page 1-11 for the original label text.

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Part Name Part Number
Back Cushion Kit, Lowback 4850-700-001
Back Cushion Kit, Highback 4853-700-001
Back Cushion Kit, Comfort-Flex 4856-700-001
Glide, Black (Color packages A, D, and E only) 4850-100-127
Glide, Stone (Color packages B and C only) 4850-100-128
Plastic Cap, Chestnut (Armless chair - color package A only) 4850-100-115
Plastic Cap, White (Armless chair - color package B only) 4850-100-117
Plastic Cap, Satin Nickel (Armless chair - color package C only) 4850-100-116
Plastic Cap, Orange/Brown (Armless chair - color package D only) 4850-100-118
Plastic Cap, Black (Armless chair - color package E only) 4850-100-114
Seat Foam Assembly, Upholstered (Armless chair only) 4850-020-100
Seat Foam Assembly, Upholstered (Chairs with arms only) 4853-020-100
The parts and accessories listed on this page are all currently available for purchase. Some of the parts identified on
the assembly drawing parts in this manual may not be individually available for purchase. Please call Stryker Customer
Service USA at 1-800-327-0770 for availability and pricing.
Quick Reference Replacement Parts List

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Service Information
LEG GLIDE REPLACEMENT (ALL MODELS)
Tools Required:
• Hammer
• Slotted Screwdriver
Procedure:
1. Flip the chair or ottoman upside down, so the legs are off the ground.
Note: Place a sheet or equivalent on the floor to protect the chair or ottoman fabric from damage.
2. Using a hammer and slotted screwdriver, carefully remove the damaged leg glide (A) from the leg (B) as shown in
Figure 7 (ottoman leg) or Figure 8 (chair leg). Discard the glide.
3. Using a hammer, install the new leg glide by hitting it into the chair or ottoman leg until it is flush with the end of
the leg.
Note: The leg glide is tapered. Before installing, make sure that the thinner side is positioned inward to the middle
of the chair or ottoman.
4. Flip the chair or ottoman back upright.
5. Verify proper operation of the unit before returning it to service.
Figure 8: Chair Leg Glide ReplacementFigure 7: Ottoman Leg Glide Replacement
A
B
A
B

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Service Information
CHAIR BACK REPLACEMENT (FOR MODELS 4850, 4851, 4852, 4853, AND 4854)
For Models 4850, 4851, and 4852, install kit (p/n 4850-700-001)
For Models 4853 and 4854, install kit (p/n 4853-700-001)
Tools Required:
• Large Slotted Screwdriver
• #3 Phillips Screwdriver
Procedure:
1. Using a large slotted screwdriver, carefully remove the back panel (A) from the back cushion (B) (Figure 9).
Note: There are seven push rivets (C) for models 4850, 4851, and 4852 that secure the back panel to the back
cushion. There are nine push rivets (C) for models 4853 and 4854 that secure the back panel to the back cushion
(Figure 9).
2. Using a #3 Phillips screwdriver, remove the four screws (D) that secure the back cushion to the chair frame (E)
and remove the back cushion (Figure 9). Discard the back cushion, back panel, and screws.
3. Using a #3 Phillips screwdriver, install the supplied four screws to secure the new back cushion to the chair frame.
Start each screw first, then tighten all four.
4. Install the new back panel into the new back cushion by aligning all seven push rivets to the back cushion T-nuts.
Push each push rivet in carefully by feeling for it from the outside of the fabric.
Note: Make sure that each push rivet is
fully seated and the back panel is tight to
the back cushion.
CAUTION
To avoid the risk of equipment damage to
the new back panel, make sure that each
push rivet is aligned with each T-nut prior to
installation.
5. Verify proper operation of the unit before
returning it to service.
Figure 9: Back Replacement (Model 4853 shown)
A
B
D
C
E

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Service Information
CHAIR BACK REPLACEMENT (FOR MODELS 4855 AND 4856)
For Models 4855 and 4856, install kit (p/n 4856-700-001)
Tools Required:
• Slotted Screwdriver
• #3 Phillips Screwdriver
Procedure:
1. Using a large slotted screwdriver, carefully remove the back panel (A) from the back cushion (B) (Figure 10).
Note: There are eleven push rivets (C) that secure the back panel to the back cushion (Figure 10).
2. Using a #3 Phillips screwdriver, remove the six screws (D) that secure the back cushion to the chair frame (E) and
remove the back cushion (Figure 10). Discard the back cushion, back panel, and screws.
3. Using a #3 Phillips screwdriver, install the supplied six screws to secure the new back cushion to the chair frame.
Start each screw first, then tighten all six.
4. Install the new back panel into the new back cushion by aligning all eleven push rivets to the back cushion T-nuts.
Push each push rivet in carefully by feeling for it from the outside of the fabric.
Note: Make sure that each push rivet is
fully seated and the back panel is tight to
the back cushion.
CAUTION
To avoid the risk of equipment damage to
the new back panel, make sure that each
push rivet is aligned with each T-nut prior to
installation.
5. Verify proper operation of the unit before
returning it to service.
Figure 10: Back Replacement (Model 4855 shown)
A
B
D
C
E