Hale SMR-U User Manual

Page 16

Priming valve
diaphragm

Fig 8-2 Priming End Cap
Assembly

On re-assembly, a new diaphragm, seal washer and
O rings should be fitted without exception and care
should be taken to ensure that the vent hole in the
end cap is clear and towards the base of the unit.

All components must be clean and dry before
reassembly.

To remove primer cylinders, these are retained by 2
special nuts mounted diagonally on cylinder
assembly and may then be withdrawn (care should
be taken to prevent bearing housing oil leakage or
contamination, if the cylinders are withdrawn).

Extreme care is required if the primer cylinder
assembly is to be stripped, because of the strong
return spring. It is strongly recommended that Tool
No PSK2956 and 57437 are used for disassembly
and reassembly of the cylinder assembly.

Cylinder disassembly (see Fig 8-2)

Locate and clamp flats on piston rod end. Depress and hold cylinder at least on mid
stroke, remove centre socket head screw and carefully release spring pressure
acting on underside of cylinder. Remove piston rod and spring. To remove piston
from cylinder bore, fit seal spreader Tool No 57437 to piston rod and reengage
piston rod (less spring) to push piston from cylinder bore. If piston rings are worn or
scored, both the piston ring and its O rings must be replaced before reassembly.

Piston

Fig 8-3 Primer piston cylinder

Spring

Piston rod seal
components