Versa-Matic N25 AIR OPERATED AIR OPERATED DOUBLE DIAPHRAGM PUMP - Manual (Page 9)

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Removal of Diaphragm Shaft :-
After first removing manifolds and air-hoses, remove both outer covers (8), followed by frontplates (34), fluid
diaphragms (10), backplates (35) and bumpstops (9 & 36). Separate Spacer/Covers Assy. from Valve Chest
Assy. by removing 8 off M8 x 35 bolts and sliding either halve from shaft. Diaphragm Shaft can now be removed
together with air-chamber diaphragm and locking plate etc. Assembly is reverse of removal, after first fitting seal
guide supplied in air side kit SA10459 into end of diaphragm shaft as shown above before sliding valve chest
centre over shaft. This will allow shaft to pass thro’ centre without damaging seals. If air-chamber diaphragm has
been removed from shaft apply a small amount of Loctite grade 242 to locking plate (25) prior to refitting.