MAINTENANCE OF UPPER AND LOWER MAIN CASE ASSEMBLY - (Cont)
Figure 5-7. Gears and bearing Plate
Inspect R-valve and ensure the 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, inspect and replace defective parts.
Inspect P-valve and ensure needle moves freely and seats securely. If not, inspect and replace defective parts.
Inspect bearings for wear. Replace if bearing surface is deeply scored and/or shaft shows signs of sloppy
movement when manually rotated in place. Replace bearings if either of these conditions exist.
Repair is accomplished by replacement of parts.
Assemble R-valve assembly.
(a) Install piston (5, Figure 5-9) into cylinder (2), position preformed packing (6) on piston head.
(b) Screw cylinder (2) onto body (7), hand tighten.
(c) Align outermost hole (3) on piston shaft (5) with slot in cylinder (2).