6
E-2) Impeller Service:
Remove hex nuts (16). Remove nut (36L) from gas cock
(36A), see Figure 4. Remove pump body (14) exposing
square ring (8), impeller (12) and U-cup (13). Examine
impeller inlet hub for excessive wear and examine square
ring and U-cup; replace if required.
When impeller (12) is to be replaced, loosen impeller with
a block of wood and a hammer. The impeller thread is right
hand and to loosen turn counterclockwise.
At reassembly, handle impeller carefully so as not to damage
the impeller inlet hub, which is a machined sealing surface
and any damage to this surface will destroy the U-cup (13).
Also, make sure the spring (9C) of shaft seal (9) are in place
before reassembling the impeller.
E-3) Shaft Seal Service:
To expose the seal for examination or replacement, remove
body and impeller as outlined in Paragraph E-2. Remove
spring (9C), rotating member (9B) and shaft sleeve (2)
from engine shaft. Remove hex nuts (7) and lock washers
(6) and pull intermediate coupling (4) from engine (1). All
of the components of the shaft seal are now exposed for
examination or repair. If any part of the shaft seal shows wear
or damage, replace entire seal assembly. When stationary
member (9A) needs replaced, press used stationary member
out of intermediate coupling (4).
CAUTION! - Handle seal parts with extreme care.
DO NOT scratch or mar lapped faces.
Lightly oil seal cavity in intermediate coupling (4). Lightly oil
ring of stationary member (9A) and press stationary member
into intermediate coupling. Reassemble intermediate coupling
(4) onto engine (1).
Lightly oil and replace shaft sleeve (2). Lightly oil inner
surface of bellows of rotating member (9B). With lapped
surface facing intermediate coupling, slide rotating member
(9B) onto shaft sleeve until lapped faces of (9A) and (9B)
are together. If fi nger pressure is not suffi cient, use a piece
of tubing making sure to press ONLY on bellows tail section,
not on metal retainer (See Figure 2). Make sure driving lugs
in retainer are mated in carbon washer. Place spring (9C) on
shaft sleeve and in place on rotating member (9B) making
sure it is seated on metal retainer and not cocked or resting
on bellows tail.
Replace impeller (12), making sure spring (9C) is properly
seated on impeller and rotating member. Reassemble
remainder of pump in reverse order of disassembly.
SECTION: F REPLACEMENT PARTS
F-1 ORDERING REPLACEMENT PARTS:
When ordering replacement parts, ALWAYS furnish the
following information:
1. Pump serial number and date code. (F-4)
2. Pump model number. (F-3)
3. Pump part number. (F-2)
4. Part description.
5. Item part number.
6. Quantity required.
7. Shipping instructions.
8. Billing instructions.
F-2 PART NUMBER:
The part number consists of a six (6) digit number, which
appears in the catalog. A one or two letter suffi x may follow
this number to designate the design confi guration. This
number is used for ordering and obtaining information.
F-3 MODEL NUMBER:
This designation consists of numbers and letters which
represent the discharge size, series horsepower, motor phase
and voltage, speed and pump design. This number is used
for ordering and obtaining information.
F-4 SERIAL NUMBER:
The serial number block will consist of a six digit number,
which is specifi c to each pump and may be preceded by
a alpha character, which indicates the plant location. This
number will also be suffi xed with a four digit number, which
indicates the date the unit was built (Date Code).
EXAMPLE: A012345 0490.
Reference the six digit portion (Serial Number) of this number
when referring to the product.
Figure 2
Summary of Contents for 2020HC
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