5-7. REPAIR UPPER HOUSING ASSEMBLY (Cont'd).
Remove five hex screws (1) and lift cover (2) from upper housing assembly.
Remove gasket (3).
Remove retainer washer (4) by compressing spring (5) and sliding washer out of groove in arm retainer (8).
Unscrew arm retainer (8) from upper housing and remove spring (5), ball pivot (6), and arm (7).
Unscrew R-valve (9) from upper housing.
Unscrew bal-valve (10) from upper housing. If bal-valve cap (11) remains inside housing, push cap out of
upper housing. Remove preformed packing (12) from cap and discard.
Clean all components
Inspect arm retainer (8) for flat areas, ensure ball pivot (6) moves freely on arm Replace
arm retainer, if necessary.
Inspect spring (5) for damage. Replace if necessary.
Inspect cam bearing on arm (7) for free movement.
Apply grease to arm retainer (8) and ball pivot (6)
Inspect R-valve (9) and ensure that plunger moves freely. Hold R-valve in hand and blow into it to make
sure air moves through freely. Seating plunger, blow again; no air should go through. If you are able to blow through
with plunger seated, replace.
Inspect bal-valve (10) and ensure needle moves freely and seats securely. If not, replace.
Position arm retainer (8) through threaded hole in upper maincase.
Place arm (7) on arm retainer (8).
Place ball pivot (6) on arm retainer (8), ensuring that ball pivot fits into arm cradle.
Place spring (5) on arm retainer (8)
Screw arm retainer (8) into threads in housing until head bottoms out