Dover PSG BLACKMER MRLXW4B Petunjuk Pemasangan, Pengoperasian, dan Pemeliharaan - Halaman 9
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MAINTENANCE: M(R)LX(W)4B Series
PUMP ASSEMBLY
Before reassembling the pump, inspect all component
parts for wear or damage, and replace as required. Wash
out the bearing/seal recess of the head and remove any
burrs or nicks from the rotor and shaft. Remove any
burrs from the liner (41).
1.
LINER – The liner (41) has a close fit with the casing
(12); take care to avoid finger injury during installation.
a.
Align and start the liner (41) and liner key (74)
together into the pump casing (12). The word
"INTAKE," which is cast into the liner, must be
towards the intake side of the pump. NOTE: The
intake port is marked with an inward facing arrow.
b.
Lightly tap the outer edge of the liner with a plastic or
lead hammer to fully insert it into the casing.
2.
DISC – Before the disc is attached to the head, make
sure both surfaces are clean and smooth. Gently file
away any burrs or rough spots.
a.
Place a disc (71) on the head (20 or 20A) with the
counterbored screw holes facing up.
b.
Position the disc so that when the head is
mounted with the drain hole and V-notch down, the
word "INTAKE" on the disc will be towards the intake
side of the pump. The two disc holes must be in the
2 and 4 o'clock positions if the inlet is on the right
(see Figure 6).
c.
Install the four lockwashers (71B), tangs outward,
and machine screws (71A) to attach the disc to the
head.
3.
HEAD ASSEMBLY
a.
To mount the head assembly (20 or 20A) to the
casing, first install the head O-ring (72) in the groove
formed where the disc meets the head.
b.
Grease the chamfer on the pump casing where the
head O-ring will need to slide into position.
c.
Place the head assembly (20 or 20A) on the studs,
with the V-notch and drain hole facing down (towards
the bottom of the pump).
d.
Check to make sure the word "INTAKE" on the disc
is towards the intake side of the pump when the
head is mounted.
e.
Install and tighten the two nuts (21C) on the head
studs.
f.
Install and tighten the head capscrews (21)
uniformly, making sure the head O-ring (72) slides
into place without damage.
Figure 6
4.
Attach one hub (20C) and bearing (24) to the mounted
head without O-rings or mechanical seal components.
Install and snug up the hub capscrews (21D).
NOTE: This step is intended as an assembly aid and is
essential to help guide the rotor and shaft into place
without damaging the mechanical seal. The remaining
parts of the hub will be installed later. BEGIN WORKING
ON THE OPPOSITE SIDE OF THE PUMP.
5.
ROTOR AND SHAFT
It is necessary to install the bottom vanes and the
push rods in the rotor while inserting the rotor and
shaft into the pump casing.
a.
Partially install the rotor and shaft (13) into the open
side of the pump and through the bore of the
installed head (20 or 20A). Be careful not to damage
the disc face with the shaft end.
NOTE: When installing the rotor and shaft, the
rotation arrow on the rotor must point in the
direction of pump rotation-towards the
discharge side of the pump when the arrow is
positioned directly below the shaft. See Figure 6.
b.
Keep part of the rotor (13) outside the casing (12)
such that the three bottom vanes (14) (rounded edge
outward) can be inserted into the rotor slots and held
in place while all three push rods (77) are inserted.
See Figure 7.
c.
The rotor and shaft (13), with the three bottom vanes
(14) installed, can now be fully inserted into the
casing (12).
d.
Install the remaining vanes (14) in the top positions
of the rotor (13).
6.
In order to lift and square the rotor against the previously
installed head, it is necessary to temporarily install the
bearing (24), bearing spacer (24D), and the locknut (24A)
on the mounted head and hub assembly. This will
position the rotor, and aid in installing the second head
assembly.
a.
Grease the bearing (24) and place it into the bearing
housing in the hub (20C).
b.
Slide the bearing spacer (24D) and locknut (24A)
onto the shaft and snug up the locknut by hand.
7.
Follow Steps 2 and 3 to install the remaining head
assembly (including the head, head O-ring, and disc).
Remember to grease the entire casing chamfer to help
slide the head O-ring into place.
106-A00
Page 9/20
Figure 7