Delavan M125 - Manual (Page 7)

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Document HD Magnum Install 3.15.06
Hydraulically Driven Centrifugal Pumps
7
Repair Information
Replacing Hydraulic Motor Shaft Seal
1. Remove the four bolts on the
volute using a 9/16” wrench.
Fig. 1.
2. Remove the impeller nut
using a 3/4” socket. Hold the
impeller from turning by using
a screwdriver in vanes of the
impeller. Fig. 2.
3. Remove the impeller key using
pliers and screwdriver. Fig.
3.
4. Remove the spring assembly
from the shaft by pulling it off
with your hand. Fig. 4.
5. Work the outer seal half off
the shaft carefully with a
screwdriver. Fig. 5.
6. Work the inner seal half off out
of the housing carefully with a
small flat bladed screwdriver.
Break the ceramic with a
hammer and screwdriver if
necessary to remove. Fig. 6.
7. Reassemble with a new seal
kit. Install new ceramic seal
half in the bearing housing
with the ceramic facing out.
8. Carefully slide the carbon seal
half over the shaft so that the
carbon and ceramic are facing
each other.
9. Complete the seal assembly
in the reverse order shown.
Install a new o-ring on the
frame housing for the volute.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Replacing Pump Mechanical Seal
1. Remove motor from the
pump using a 9/16” wrench.
Fig. 7.
2. Using an allen wrench,
unscrew the four allen bolts
and remove the front flange.
Fig. 8.
3. Remove the mechanical
seal half and o-ring from the
flange. Fig. 9.
4. Remove the mechanical
seal half, o-ring, spacer and
spring from the motor.
5. Reassemble with a new seal
kit in the reverse order. Fig.
10.
Fig. 7
Fig. 8
Fig. 9
Fig. 10