Mechanical Oil Seal; Inserting The Plunger; Stuffing Box, Packing And Plunger Assemblies; General - Pentair myers aplex Series Installation And Service Manual

The Poly Pak seal is inserted into its counter bore with
its lips directed toward the oil in the crankcase. (Will
NOT work if installed backward!)
O-RING
POLYPAK ROD SEAL
TO CRANKSHAFT

MECHANICAL OIL SEAL

The oil seal is to keep contamination out of the power
frame. With the box positioned in a hydraulic press,
install the backup seal against the Poly Pak seal, with
the lips of both seals facing downward.
PRESS
SUPPORT
The mechanical seal contains a garter spring. Check
to see that this spring is still properly located and in
its position. The mechanical seal has a metal case
which serves to force the Poly Pak seal into its cavity,
energizing its lips. Apply oil lightly to the bore of the
box before pressing each seal into its counterbore.

INSERTING THE PLUNGER

RUBBER BAFFLE
APPLY WRENCH HERE
Insert the integral extension rod plunger through the
fluid end and through the stuffing box. Insert the
extension rod through the wiper seals with the tapered
thread and entering FIRST. Next, install rubber baffle
plate by oiling the extension rod portion of the plunger.
This baffle plate seats into a reduced diameter next to
the knurled shoulder. Care should be used in moving
the male tapered thread through wiper seals to prevent
dislocating the garter spring or damaging seal lips.
Fasten the wiper box to the power frame by evenly
tightening the two nuts on the wiper box studs. Oil
WIPER BOX
PLUNGER
WIPER BOX
30
leakage between frame face and wiper box is prevented
by an O-ring on the O.D. of the wiper box.
With extension rod inserted through the wiper box
seals, thread the tapered threads (must be clean!) into
the tapered crosshead female threads. Firmly tighten,
applying wrench to the knurled area only. Never
damage the extension rod ground surfaces!
STUFFING BOX, PACKING AND
PLUNGER ASSEMBLIES

GENERAL

Myers Aplex Series pumps all feature field removable
and replaceable stuffing boxes. The
SC-45 has integral extension rods. The plungers
may be removed separately (without box removal) to
facilitate repacking. The integral extension rod type
plunger may be removed by removing the cylinder
head plug and retainer plate allowing the plunger to be
removed through the fluid end, after unscrewing it from
the crosshead. It is not necessary to disturb the fluid
end or piping.
SPRING LOADED PACKING
SPACERS
GLAND RING
PACKING
GLAND RING
Note that the gland is screwed tightly onto the box
and contacts its face. The spring is providing all of the
initial compression and adjustment. No adjustment is
provided by the gland.
Since the force exerted by the spring is contingent on
the space provided for it, the correct lengths of all rings
are essential for good tensioning.
Spring:
A stiff Inconel spring, which closely fits the bore of
®
the stuffing box, is used in this assembly. This spring is
compressed in a vise to the operating length required
plus 0.25" and tied with waxed nylon spot tie cord. The
SPRING GUIDE
SPRING
SPRING GUIDE