Removing The Mechanical Seal; Removing The O-Ring Seat; Installing The O-Ring Seat; Installing The Mechanical Seal - Generac Power Systems MAGNUM Owner's Manual

gland would indicate a damaged or worn lip seal. Refer to
Mechanical Seal for oil recommendations.

Removing the Mechanical Seal

If the seal is to be removed, remove the impeller according
to the instructions for dismantling the pump. The rotating
.
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1. Stationary seat
2. O-ring seat
3. Retainer
4. Bellows
5. Spring

Removing the O-ring Seat

If the seal is being replaced, remove the backplate (gland
is built in) and press out the stationary seat.

Installing the O-ring Seat

Clean all parts before starting assembly. Oil the outer
surface of the seat and the O-ring with a light oil (not
grease). Place a cardboard disc on the sealing face to
avoid damage. Press the seat into the gland or stuffing box
using firm, steady pressure. Verify the seat is all the way
in. Slide the gland with the gasket or backplate over the
shaft. Install the backplate, then press the seat into the
backplate.

Installing the Mechanical Seal

Clean all parts of the pump before starting assembly.
Special attention should be given to the backplate and the
impeller hub.
Clean and lubricate the shaft.
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Owner's Manual for Dry-Prime Diesel Trash Pumps
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3
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Figure 4-4. Mechanical Seal Components
portion of the seal may now be seen. Slide off the seal
spring. Lubricate the shaft and remove the reminder of the
rotating portion, being careful to avoid damaging the
primary seal. The rubber bellows will be firmly attached to
the shaft and considerable pressure will be required to
remove it. Refer to Figure
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6
7
8
002309
6. Driving band
7. Disc
8. Rotating seal face
9. Stationary seal face
NOTE: Once the rotating portion has been placed on the
shaft, the rest of the installation must be made at once.
Install the stationary seat in the backplate.
2.
Oil the outer surface of the seat and the O-ring with
3.
a light oil (not grease). Place a cardboard disc on
the sealing face to avoid damage. Press the seat
into the gland or stuffing box using firm, steady
pressure. Verify the seat is all the way in. Slide the
gland with the gasket over the shaft.
Wipe the lapped sealing faces of the seat and the
4.
primary seal perfectly clean. Use extreme care to
avoid marking the sealing face or the primary seal.
Slide the rotating portion of the seal, including the
spring, along the shaft.
NOTE: Once the rotating portion has been placed on the
shaft, the rest of the installation must be made at once.
Delay may result in the rubber bellows seizing on the
shaft in the wrong position.
Maintenance
4-4.
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