Hypro 3430-0635 Instructions

SEAL REPLACEMENT AND
PUMP HOUSING ASSEMBLY
1. Install slinger ring on engine shaft.
2. Lubricate and install the o-ring around back side of
metal portion of the seal (See Figure 1). Insert the
stationary portion of the new mechanical seal by
carefully pushing only on the outer metal ring as
you press it into the casing cover. Use a tool with
1-1/2" ID, such as 1-1/2" diameter PVC pipe, 4"
long that fits over the carbon face of the seal, but
pushes only on the metal ring to insert the seal.
The carbon surface of the seal must be facing you
during installation. Be careful to avoid scratching
the seal's carbon surface. (See Figure 2.)
3. Apply medium strength (Blue) threadlocker onto
the (4) engine mounting bolts and install about (4)
turns into the engine. Install the pump flange by
sliding over the engine shaft 45 degrees clockwise
from the up position. Once the flange has mated to
the engine, rotate the flange 45 degees counter-
clockwise (CCW) to lock the flange into the slots.
Tighten the (4) mounting bolts with a 13mm
wrench to a torque of 10 foot pounds.
Note: Be sure to hold the pump flange in the "UP"
position when tightening bolts. This will ensure that
the pump bases will not be cocked off center in the
final assembly. (See Figure 3.)
4. Lubricate the seal cavity of the impeller with
WD-40, LPS or equivalent, and carefully press the
seal's mating ceramic ring in place, seating it
squarely on the bottom of the cavity. The glossy,
finished side of the ceramic seal must be facing
you. IMPORTANT: Make sure both seal surfaces
are clean and lubricated. Never run seal surfaces
dry. (See Figure 4.)
5. Install the impeller onto the engine shaft using the
bolt, washer and seal. Bolt seal must not be worn.
Tighten the impeller bolt to 10 foot pounds. (See
Figure 5.)
6. Install diffuser onto the casing cover with three
Phillips-head screws.
7. Install the pump casing onto the casing cover and
o-ring, and secure with the 10 bolts, nuts and
washers, using a 10mm socket and wrench.
Torque the bolts to 45 inch pounds.
8. Once assembly is complete, pull on the engine
recoil starter with engine switch in the "OFF"
position to verify that the impeller rotates smoothly
without catching. Connect spark plug wire.
Assembly and inspection is now complete.
Instructions, Seal Kit No. 3430-0635
for Transfer Pumps
Form L-1506
(5/06)
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
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