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11-5
ZR Owner’s Manual
OM_ZR_0913RevA
CHAPTER 11: CASTERS And FORKS
Frog Legs
®
I
WARNING
Always mount identical size casters and forks on both sides of your chair.
If you ignore this Warning, you may fall, tip
over or lose control of the wheelchair and seriously injure yourself or others or damage the wheelchair.
Replacing Casters
Tools Needed:
• Two #2 Phillips Head Screwdrivers
1. Remove the screws, washer, C spring washer, and axle that secure the caster to the fork. Use one screwdriver to
hold one screw in place and a second screwdriver to loosen the other screw. See Figure 11-8.
2. Remove the caster and spacers from the fork.
3. Install the new caster, spacers, washer and C spring washer onto the fork and securely tighten the two screws so
there is no space between the caster, the spacers and the fork sides. Use one screwdriver to hold one screw in
place and securely tighten the other screw with the second screwdriver.
Note: If your chair has 4” or 5” TiLite performance casters, make sure that Spacer 2 (which is wider than Spacer 1) is
positioned on the recessed side of the caster, which should be oriented outwards when the casters are in the trailing
position.
Relacing the Elastomer Shock
Tools Needed:
• Two 5/32” Allen Wrench
1. Remove the Allen screws from the hinge and push out
the threaded spacer. See Figure 11-7.
2. Separate the two halves of the Frog Legs
®
to release
the elastomer shock.
Note: The metal disc is glued to the top of the elastomer
shock.
3. Install the new elastomer shock (making sure the metal
disk is facing upward).
4. Push firmly on the two halves of the Frog Legs
®
to
facilitate reinstalling the Allen screws and threaded spacer.
I
WARNING
The threads on the Allen screw that connects the two halves of the Frog Legs
®
are treated with Loctite
®
242
®
, a
medium strength thread lock. If you loosen this Allen screw, you MUST remove and reapply Loctite
®
242
®
or an
equivalent medium strength thread lock.
If you ignore this Warning, your rear wheel could become loose or fall off
and you could fall, tip over or lose control of the wheelchair and seriously injure yourself or others or damage the
wheelchair.
Replacing Frog Legs
®
Tools Needed:
• 5/8” Open End Wrench
• Torque Screw Driver with a 5/64” hex tip
I
WARNING
The threads on the screws that secure the stem bolt to the “Bullet” Caster Housing and the set screw are treated with
Vibra-TITE
®
VC-3, a locking and sealing coating, to reduce the possibility they will become loose. You should be
able to remove and reinstall these screws and bolts approximately four times without reapplying the coating. If you
repeatedly remove and reinstall these screws and bolts, TiLite requires that you reapply Vibra-TITE
®
VC-3 after every
fourth adjustment.
If you ignore this Warning, you may fall, tip over or lose control of the wheelchair and seriously
injure yourself or others or damage the wheelchair.
Figure 11-7
Replacing the Elastomer Shock on Frog Legs
®
Allen Screw and
Threaded Spacer
Elastomer
Shock
Fork Stem
Metal Disk
Hinge