Pentair AURORA Edwards 80 User manual

Edwards Model 20 / Model 80
Pump Ma

1-1
General 1
Introduction
The Edwards Model 20and Model 80 pumps(Figure 1-1) are standard-duty high-speed gear-driven
positive-displacement rotary pumpswith gear-type rotors. The pumpsare self-priming.
Edwards rotary pumps are available in many configurations. While they may look alike,
there may be significant differences from one pump to another. Differences include
construction material, sealing method, rotor type, etc.
Figure 1-1. Edwards Model 20 & Model 80 Pumps

2-1
Maintenance 2
l
Edwards rotary pumps are available in many configurations. While they may look alike,
there may be significant differences from one pump to another. Differences include con-
struction material, sealing method, rotor type, etc. This manual covers only one config-
uration, which is defined by a model number and a serial number. Check the name plate
on the pump to make certain the model number is 20-420 and the serial number is
________________. If the numbers do not match, contact Edwards - Pentair Water.
Most pump repairs can be performed by maintenance personnel using normally avail-
able tools.
Consumable Materials
Cleaning materials, lubricants, and other products needed during pump maintenance
are listed in Table 2-1.
Do not perform maintenance using this manual if the model number on the
pump is not 20-420 or the serial number is not ________________. Performing
maintenance using the wrong manual could result in pump failure or personal
injury.
Table 2-1. Consumable Materials
Item Nomenclature Specification Common Name
1 Lint-Free Cloth MIL-C-85043
2 “Dry” Cleaning Solvent Acetone, Brake
Cleaner
3 Emery Cloth 220 Grit 3M, Anderson,
Sandvik, Mirka
4 Anti-Seize Compound “Nev’r Seize”
5 Red Loctite PermaLoc HH-120
6 High-Tack Gasket Spray Loctite, Permatex

2-2
Model 20 / Model 80 Pumps
Lubrication
To ensure a long service life, the pump should be lubricated routinely with approved
grease (7, Table 2-1). If the pump is operating under normal loads and temperatures,
use the intervals defined in Table 2-2. If the pump is operating at over 180°F, contact
Edwards - Pentair Water for recommended lubrication interval for your application.
Troubleshooting
Table 2-3 provides assistance in diagnosing and correcting malfunctions that may occur
during normal operation.
7 General Purpose Grease MIL-G-18709
NLGI #2
Chevron Ulti-Plex,
Shell Retina LC
8 Lapping Compound D51804, 180 Grit
Silicon Carbide
Felpro “Clover”
Brand
Ta b l e 2 - 2 . Lubrication Schedule
Item Interval Amount of Grease
Bearings 6,000 Hours 0.25 Ounce
Timing Gears 6,000 Hours 1.00 Ounce
Table 2-3. Troubleshooting
Trouble Probable Cause Remedial Action
1. Pump does
not turn
1a. Seized pump. 1a. Repair or replace pump.
1b. Faulty or misaligned
coupling.
1b. Replace or realign
coupling.
1c. Damaged or missing
shaft key.
1c. Replace key.
2. Excessive
Noise
2a. Loose or misaligned
coupling.
2a. Tighten, align, or replace
coupling.
2b. Cavitation. 2b. Check suction piping with
a vacuum gauge. Gauge
should read less than 10-
in. Hg in most cases.
Contact Edwar ds for the
exact reading for your
application.
Table 2-1. Consumable Materials (Continued)
Item Nomenclature Specification Common Name
Zerk fittings do not
have check balls.
This prevents bear-
ings from being
over-greased.
Excess grease will
run out of the fit-
ting when pump is
in operation.
The pump has
heat-treated steel
timing gears,
which can be very
noisy when oper-
ated above 900
rpm. This is a nor-
mal condition, and
does not require
maintenance
action.

2-3
Maintenance
Removal
1. Before removing pump, refer to troubleshooting chart (Table 2-3) to determine if
the problem is actually the pump.
2. Ensure adequate clearance exists for removal of pump. Disassemble adjacent com-
ponents as required for adequate working clearance.
3. Before removal, clean exterior parts to remove accumulated dirt, grease, or foreign
material.
4. Apply tags to identify parts of similar configuration to ensure correct installation.
2c. Worn or damaged
bearing(s).
2c. Repair or replace pump.
3. Excessive
vibration
3a. Loose or misaligned
coupling.
3a. Tighten, align, or replace
coupling.
3b. Cavitation. 3b. Check suction piping with
a vacuum gauge. Gauge
should read less than 10-
in. Hg in most cases.
Contact Edwards for the
exact reading for your
application.
3c. Worn or damaged
bearing(s).
3c. Repair or replace pump.
4. Reduced flow 4a. Clogged suction screen. 4a. Clean or replace screen.
4b. Cavitation. 4b. Check suction piping with
a vacuum gauge. Gauge
should read less than 10-
in. Hg in most cases.
Contact Edwards for the
exact reading for your
application.
4c. Pump liners and/or
rotors worn or damaged.
4c. Repair or replace pump.
4d. Low pump speed 4d. Increase pump speed.
To avoid injury, always de-energize the input driver and lock-out or red-tag the
controller. Let the pump cool before removing.
Table 2-3. Troubleshooting (Continued)
Trouble Probable Cause Remedial Action