Section 7, To remove end covers – Hale SMR-U User Manual

Page 15

Section 7

PRIMING SYSTEMS

POSITIVE DISPLACEMENT PISTON PRIMERS

To Remove End Covers

Access to each identical primer, mounted on each side of the bearing housing, is as
follows:

The primer end cover contains a priming valve and inlet and outlet valves and is
removed by the removal of 4 nuts and washers (see Fig 8-1).
Servicing of this cover is as follows

Primer end cover

Inlet seal,
Orifice plate
Outlet seal

Cylinder
assembly

Priming valve

Fig 8-1 Piston Primer

After removal of a single central M8 socket cap screw, the inlet seal, orifice plate and
outlet seal may be removed. Replacement or reassembly may follow after applying
Loctite 262 to the screw thread. Note this screw must be tightened to ensure that
the rubber seal is compressed until metal to metal resistance is achieved.

The priming valve mounted above may be stripped as follows – remove the 4 M6
bolts (and washers) which pass through the end cover into the inlet casting (which
contains an O ring in the bore) and an O ring face seal to the end cover.

The outer end cap clamps on to a rubber diaphragm against the main cover. The
priming valve now revealed has a single socket screw and Nyloc nut to constrain its
components.