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WIPER BOX ASSEMBLY
GENERAL
Extension rod wiper boxes (sometimes referred to
as the diaphragm stuffing box or stripper housing
assembly) serve two important functions: retention of
crankcase oil in the power end and exclu sion of dirt
and water.
Aurora Pump, Aplex Series has developed a unique
sealing set which operates on a hardened and ground
stainless steel extension rod (often called "pony"
rod), and a steel baffle disc affording protection
against leaking plunger packing. The seals require no
adjustment, only correct and careful assembly.
"POLY PAK" SEAL
This seal keeps oil from leaking out of the power frame.
Developed by the Parker Seal Group, this patented rod
seal employs a soft nitrile rubber O-ring to energize
a special hard polyurethane Molythane
the inner lip against the rod and the outer lip against
the housing bore, as shown.
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!)
POLYPAK ROD SEAL
EXTENSION ROD
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.
shell by forcing
®
WIPER BOX
OUTER MECHANICAL SEAL
BAFFLE PLATE
PLUNGER
WIPER BOX
INSERTING THE PLUNGER
EXTENSION
ROD
WIPER
BOX
Insert the extension rod through the wiper seals with
the tapered thread and entering FIRST. Care should
be used in moving the extension rod through the seals
with wrenching flats entering first. Do not force! The
sharp corners on the wrenching flats may damage the
seal lips! (Resulting in oil leakage.)
With extension rod inserted through the wiper box
seals, thread the tapered threads (must be clean!) into
the tapered crosshead female threads. Firmly tighten,
apply torque to the wrenching flats only. Never damage
the extension rod ground surfaces!
Then fasten the wiper box to the power frame by
tightening the cap screws. Oil leakage between frame
face and wiper box is prevented by use of a gasket
beneath the box flange.
STUFFING BOX, PACKING AND
PLUNGER ASSEMBLIES
GENERAL
Aurora Pump, Aplex Series pumps all feature field
removable and replaceable stuffing boxes with plungers
separable from the extension rods.
If desired, the boxes, plungers, and packing units may
be installed (or removed) as a unit assembly, permitting
service outside the pump. All boxes are retained by
four (4) studs and nuts, and are centered in the frame
bore, ensuring correct alignment.
The plungers may also be removed separately (without
box removal) to facilitate repacking. With this option,
the necessary space required to remove plunger, it is
first necessary to remove the extension rod.
16
WRENCHING
FLATS
TAPERED
THREADS
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