Invacare Pro Series Adjusting Front Caster Headtubes, A Note About Caster Headtube Adjustments

CASTERS PROCEDURE 5

8.Toproperlytightenfrontcasterforksandguardagainst flutter, perform the following check:

a.Tip back of wheelchair to floor.

b.Pivot both forks and casters to top of their arc simultaneously.

c.Let casters drop to bottom of arc (wheels should swing once to one-side, then immediately rest in a straight downward position).

d.Adjust locknuts according to freedom of caster swing.

9.Test wheelchair for maneuverability.

10.Readjust locknuts if necessary and repeat STEPS 8-9until correct.

11.Snap dust cover over the locknut and stem.

NOTE: An indexing notch has been put on the adjust- ment cam to help determine the adjustment cam po- sition for the opposite caster headtube.

8.Reinstall the locknut onto the top hex screw and se- curely tighten the two (2) hex screws and locknuts.

	Wheelchair Frame
	Adjustment Cam
Caster Headtube
Caster	Indexing Notch
Headtube	Hex Screws
Perpendicular
	and Locknuts
to Floor

C A S T E R S

ADJUSTING FRONT CASTER HEADTUBES

WARNING

The following procedure should be per- formed only by an authorized Invacare

Caster

Headtube

Caster/Fork

Dealer or Qualified Technician.

"L" Square

Flat Surface

A NOTE ABOUT CASTER HEADTUBE ADJUSTMENTS

Whenever the seat height is raised or lowered by chang- ing the caster size, fork stem length, rear wheel size or axle mounting plate adjustments, the caster angle needs to be checked to maintain a 90o angle between the caster headtube and the ground/floor. Caster headtubes that are perpendicular to the floor will roll better, track straighter and minimize any "3-wheeling" of the wheelchair.

Pro-SA Model Wheelchairs (FIGURE 3)

1.Place the wheelchair on a flat surface.

2.Loosen, but do not remove, the two (2) hex screws and locknuts that secure the caster headtube to the wheelchair frame.

3.Remove the TOP locknut and adjustment cam from the caster headtube.

4.Position a large right triangle or "L" square on the flat surface and against the caster headtube.

5.Position the caster headtube flat against the right tri- angle or "L" square.

6.Reinstall adjustment cam onto the top hex screw.

7.With the caster headtube flat against the right triangle or "L" square, rotate and position the adjustment cam until the adjustment cam sits flush in the grooves of the caster headtube.

Indexing Notch

CASTER

TRAILING

CASTER

LEADING

Floor

FIGURE 3 - ADJUSTING FRONT CASTER

HEADTUBES - PRO-SA MODEL WHEELCHAIRS

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