MAINTENANCE MANUAL
GP/146/99. Issue 9. October 2005
Section 8
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
detached 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 (see Fig 8-2) 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.
©Hale Products Europe LTD, Warwick
GP/146/99
WTmaint - Issue9. 10-2005October 2005
21
