Dover PSG Blackmer TXD1225A Istruzioni per l'installazione, il funzionamento e la manutenzione - Pagina 8
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VANE REPLACEMENT
NOTICE:
Maintenance shall be performed by qualified technicians
only, following the appropriate procedures and warnings
as presented in manual.
1. Remove the head assembly from the outboard (non-
driven) side of the pump according to steps 2 - 6 in the
"Pump Disassembly" section of this manual.
2. Turn the shaft by hand until a vane comes to the top (12
o'clock) position of the rotor. Remove the vane.
3. Install a new vane, ensuring that the rounded edge is UP,
and the relief grooves are facing towards the direction of
rotation. See Figure 4.
4. Repeat steps 2 and 3 until all vanes have been replaced.
5. Reassemble the pump according to steps 2 - 7 and 12 -
17 of the "Pump Assembly." section of this manual.
2-inch models have four (4) vanes.
PUMP DISASSEMBLY
NOTICE:
Follow all hazard warnings and instructions provided in
the "Maintenance" section of this manual.
1. Starting on the inboard (driven) end of the pump, clean
the pump shaft thoroughly, making sure the shaft is free of
nicks and burrs. This will prevent damage to the
mechanical seal when the inboard head assembly is
removed.
2.
Remove the inboard bearing cover capscrews (28) and
slide the inboard bearing cover (27A) and gasket (26) off
the shaft. Discard the bearing cover gasket. On the 1.5,
2, and 2.5 inch pump models, the dirt shield (123A) will
come off with the bearing cover.
3.
Remove the outboard bearing cover capscrews (28) and
slide the outboard bearing cover (27A) and gasket (26) off
the shaft. Discard the bearing cover gasket.
MAINTENANCE
Figure 4
4. Remove locknuts and lockwashers (24A, 24B):
a. Bend up the engaged lockwasher tang and remove
setscrew (24C). Rotate the locknut counterclockwise
to remove it from the shaft.
b. Slide the lockwasher off the shaft. Inspect the
lockwasher for damage and replace as required.
c. Repeat steps a and b on the opposite shaft end.
5. Remove the head capscrews (21) and carefully pry the
head (20) away from the cylinder.
6. Slide the head off the shaft. The head O-ring (72), bearing
(24), and mechanical seal (153) will come off with the
head assembly. Remove and discard the head O-ring.
a. Pull the bearing (24) from the housing in the head.
To remove the mechanical seal (153), use two screw
b.
drivers to gently push the backside of the seal jacket
to push the seal from the head (see Figure 5). Use
care when placing the screwdrivers to prevent damage
to the seal faces. Remove and discard mechanical
seal O-rings.
7. Pull the rotor and shaft (13) from the cylinder (12). While
one hand is pulling the shaft, the other hand should be
cupped underneath the rotor to prevent the vanes (14)
from falling out. Carefully set the rotor and shaft, vanes
aside for future vane replacement and reassembly.
8. Remove the remaining components from the outboard
side of the pump, as instructed in steps 6 and 7 above.
201-D00
page 8/12
Figure 5