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Invacare Pronto M91 Base Mobility Aid User Manual

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SECTION 8—SHROUD/WHEELS

Part No 1143153 55 Pronto® M91™Base with SureStep®

Replacing Front/Rear Caster Assemblies

NOTE:Forthisprocedure,referto

FIGURE 8.3.

NOTE:Frontandrearcasterassembliesare

replacedinthesamemanner.

NOTE:Whenreplacingthefront/rearcaster

assemblies,itisnecessarytobracethecaster

assembliestopreventthewheelfromspinning.

1. Removethemountingscrew,two

washers,andlocknutthatsecuresthe

castertothefork.

2. Removethecasteranddiscard.

FIGURE 8.3 Replacing Front/Rear Caster

Assemblies

3. Securenewcastertoforkwithexistingmountingscrew,twowashersandlocknut

(FIGURE 8.3).Securelytighten.

Adjusting Forks

NOTE:Forthisprocedure,refertoFIGURE 8.4.

1. Removethedustcover.

2. Toproperlytightencasterjournal

systemandguardagainstflutter,

performthefollowingcheck:

A. Tipbackthewheelchair.

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.

3. Testwheelchairformaneuverability.

4. Readjustlocknutsifnecessary,and

repeatSTEPS1‐3untilcorrect.

FIGURE 8.4 Adjusting Forks

5. Snapdustcov erintothecasterheadtubeensuringthatthetabsareundertheplastic

sideshrouds.

NOTE:Componentsexplodedforclarity.Thereisnoneedtoremovetheforkfromthebaseframe.

Washer

Mounting

Screw

Caster

Locknut

Washer

Fork

Base

Frame

Tabs

Locknut

Dust

Cover

Washer

Side

Shroud

Caster

Headtube

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