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7.

Turn new u-joint assembly upright and fill with Lubiplate or Amoco grease.  
Make sure the new adjustable control arm is adjusted the same length as the 
old one just removed.  

NOTE: The adjustable control arm is adjusted so the 

control button clears the front edge of outer seat shell 1/8” when front slide 
control is adjusted in the down position.  

Reverse the disassembly procedure 

steps 6 thru 2 only and assemble the new parts.

NEW ADJUSTABLE

CONTROL ARM

Assembly Directions
93-9501164  REV  B

Page

6 of 6

EXISTING DIMENSION FOR

OLD ADJUSTABLE CONTROL ARM

LUBRIPLATE OR

AMOCO GREASE

U-JOINT

ASSEMBLY

8.

Place the chair upright on the floor.  Check the chair to verify that all functions are operating properly.  Invert the 
chair back onto workbench and reassemble the outer back shell onto upholstered back.  This step is in reverse of 
step 1, page 3 of these directions.  You may wish to use an awl to find the existing screw holes on the inner back 
assembly.  Proper positioning is required for function appearance. 

CONTROL

BUTTON

1/8”

FRONT

SLIDE

CONTROL

Summary of Contents for Con-Centrx 451-141

Page 1: ...e Variable Back Locking Mechanism Package Number 25 4540800 These directions apply to the following Con Centrx chair models Managerial chair 451 141 141M 171 171M 147 147M 177 and 177M Operator chair 454 150 150M 180 180M 151 151M 152 152M 181 181M 182 and 182M IMPORTANT Please read these directions completely through prior to starting step 1 A W L O POWER ...

Page 2: ...ays clear outer plastic seat shell and actuation force should not be excessive Variable Back Attitude Replacement and Mechanism Adjustment Should the chair fail to perform satisfactorily in any of the functions described above check adjustment per step 8 If adjustment is satisfactory and the variable back locking mechanism is not operating properly replace according to steps 1 thru 11 Package Cont...

Page 3: ...k shell from upholstered back NOTE Extreme care should be taken with the screwdriver when removing screws to prevent damage to the outer plastic shell 10 SCREWS 1 2 LONG OUTER BACK SHELL 8 SCREWS 1 1 2 LONG 8 SCREW 1 1 8 LONG UPHOLSTERED BACK VARIABLE BACK LOCKING MECHANISM IMPORTANT THIS CIRCLED AREA INDICATES THE LOCATION FOR THE FOLLOWING STEPS 2 3 4 5 and 6 ...

Page 4: ... control arm by hand Save adjustable control arm for the adjustment of new control arm Old removed parts are not to be used ADJUSTABLE CONTROL ARM 3 Remove the retainer ring from the end of the pivot pin by using the flat bladed screwdriver and slide pin out Remove overcenter spring and pawl from lower mounting bracket Old removed parts are not to be used PAWL ADJUSTABLE CONTROL ARM RETAINER RING ...

Page 5: ...d gear assembly clock wise while at he same time lifting up thus removing it from the chair Old removed parts are not to be used 6 Remove retainer ring from the end of u joint pin by using a flat bladed screwdriver Slide pin out and remove u joint assembly RETAINER RINGS PIVOT BUSHING PIVOT BUSHING HOUSING AND GEAR ASSEMBLY HOUSING AND GEAR ASSEMBLY RETAINER RING U JOINT ASSEMBLY U JOINT PIN ...

Page 6: ...parts NEW ADJUSTABLE CONTROL ARM Assembly Directions 93 9501164 REV B Page 6 of 6 EXISTING DIMENSION FOR OLD ADJUSTABLE CONTROL ARM LUBRIPLATE OR AMOCO GREASE U JOINT ASSEMBLY 8 Place the chair upright on the floor Check the chair to verify that all functions are operating properly Invert the chair back onto workbench and reassemble the outer back shell onto upholstered back This step is in revers...

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