Scissor Mechanism - ultracomfort UC214 Service Manual

25. Push forward on the disconnecting latch. Make sure it engages fully with the hand control plug
base.
26. Clip the Smart Tek® hand control to the black plastic hook on the side of the chair arm.
27. Plug the transformer back into the wall outlet and test.
Scissor Mechanism Replacement
Tools needed: Needle nose pliers, P2 Phillips screwdriver, T30 screw bit, wire cutters, zip
ties, 3/8 inch socket, a stool or stand for placing the chair upside down.
1. Unplug the transformer from the wall outlet.
2. Reach down into the chair's side pocket until you feel the disconnect latch on the hand control
extension.
3. Pull back on the disconnecting latch.
4. Put one hand on the back of the extension wire plug base and one on the hand control plug
base and pull the two pieces apart.
5. Gently push the chair over onto the footrest, turn it upside down or,
gently push it over onto its side, opposite of the hand control.
6. Unplug the transformer and the hand control extension from
the motor or control box.
7. Remove the four (4) T30 lag screws, eight (8) on models
(540M-26, 542M-26, 542-ME6, 550-M26) that hold the lift frame
to the arm assembly.
8. Remove the hitch pin(s), clevis pin(s), and washers that
fasten the recline strap(s) to the recline bar.
9. Remove the hand control extension wire clamp.
10. Lift the lift frame out of the chair shell and place it
off to the side.
11. Use the 3/8 inch socket to remove the two (2) bolts that
fasten each scissor mechanism to the arm assembly.
While this next step can be done alone, it does
You must remove the arm assembly without twisting the frame. Excessive twisting will
cause the board holding the arms together to snap.
12. Stand behind the chair and pull the arms away from the chair being careful not to get the
material snagged in the scissor mechanisms.
13. Place the arm assembly to the side.
14. Remove the two (2) bolts and Phillips screws that fasten the scissor mechanism to the
footboard.
15. Use the 3/8 inch socket to remove the bolts that fasten the scissor mechanism to the seat.
16. Use the 3/8 inch socket to install the bolts that fasten the new scissor mechanism to the seat.
17. Install the two (2) bolts and Phillips screws that fasten the new scissor mechanism to the
footboard.
18. Place the arm assembly in place so that the bolt holes in the scissor mechanisms line up with
the bolt holes in the armrest.
19. Install the two (2) bolts that fasten each scissor mechanisms to the arm assembly.
20. Make sure the footboard is completely closed.
Note: When installing the lift frame the footboard must be completely closed when you
fasten the lift frame to the armrest assembly or the footboard will not close properly.
21. Place the lift frame onto the chair shell.
13
require extra attention.