Pentair AURORA Edwards 20 User manual

Edwards Model 20 / Model 80
Pump Maintenance Manual

i
Contents
Safety
General Precautions . . . . . . . . . . . . . . iii
Warnings and Cautions . . . . . . . . . . . . iii
Warnings . . . . . . . . . . . . . . . . . . . . . . . . iii
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . iv
1 General
Introduction . . . . . . . . . . . . . . . . . . . . 1-1
2 Maintenance
Consumable Materials. . . . . . . . . . . . 2-1
Lubrication . . . . . . . . . . . . . . . . . . . . . 2-2
Troubleshooting . . . . . . . . . . . . . . . . . 2-2
Removal . . . . . . . . . . . . . . . . . . . . . . . 2-3
Disassembly . . . . . . . . . . . . . . . . . . . . 2-4
General Practice . . . . . . . . . . . . . . . . . 2-4
Disassembly Procedure . . . . . . . . . . . . 2-4
Cleaning . . . . . . . . . . . . . . . . . . . . . . . 2-6
Inspection . . . . . . . . . . . . . . . . . . . . . . 2-7
Repair and Replacement . . . . . . . . . . 2-7
Assembly . . . . . . . . . . . . . . . . . . . . . . 2-8
General Practice . . . . . . . . . . . . . . . . . 2-8
Assembly Procedure . . . . . . . . . . . . . . 2-8
Replacement. . . . . . . . . . . . . . . . . . . 2-12
3 Installation
Inspection . . . . . . . . . . . . . . . . . . . . . .3-1
Unpacking . . . . . . . . . . . . . . . . . . . . . .3-1
Repacking . . . . . . . . . . . . . . . . . . . . . .3-1
Storage . . . . . . . . . . . . . . . . . . . . . . . .3-1
Installation. . . . . . . . . . . . . . . . . . . . . .3-2
Clean Pump . . . . . . . . . . . . . . . . . . . . . 3-2
Mount Pump. . . . . . . . . . . . . . . . . . . . . 3-2
Prepare Foundation . . . . . . . . . . . . . . . 3-4
Level Pump Skid . . . . . . . . . . . . . . . . . 3-5
Grout Pump Skid . . . . . . . . . . . . . . . . . 3-5
Check Driver Rotation. . . . . . . . . . . . . 3-6
Align Couplings . . . . . . . . . . . . . . . . . . 3-7
Piping . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Strainers . . . . . . . . . . . . . . . . . . . . . . . 3-10
Overpressure Protection . . . . . . . . . . 3-10
Pre-Startup Checks . . . . . . . . . . . . . 3-11
4 Parts
Warranty

iii
Safety
General Precautions
The following are general safety precautions not related to any specific procedure. Per-
sonnel must understand and apply these precautions during both operation and main-
tenance of the pump.
Do Not Operate Pump Without Ear Protection. The pump has heat-treated steel
timing gears, which can be very noisy when operated above 900 rpm.
Be Aware of High Heat When Unit Is Running. Both operating and maintenance
personnel must observe all safety precautions at all times. To avoid injury, always de-
energize the input power sources and lock-out or red-tag the controller. Let the pump
cool before handling.
Be Aware of Chemical Hazards. Maintenance personnel must observe all safety pre-
cautions while working with the chemicals used in cleaning agents.
Warnings and Cautions
The following warnings and cautions relate to specific procedures in this manual. They
are repeated here for emphasis.
Warnings
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.
To avoid injury, always de-energize the input driver and lock-out or red-tag the
controller. Let the pump cool before removing.
To avoid injury, always use suitable protective gear. The timing gear is hot!
Overpressurization of the pump can cause equipment failure, resulting in per-
sonal injury.

iv
Model 20 / Model 80 Pumps
Cautions
Do not order parts using this manual if the model number on the pump is not
20-420 or the serial number is not ________________. Using parts ordered from
the wrong manual could result in pump failure or personal injury.
Do not hammer on pump endcase. This will cause gasket sealing surface dam-
age, resulting in leaks.
Use shaft protector between puller tip and shaft face to prevent distortion of
shaft center.
Never hammer directly on pump drive shaft. This will cause the rotor assem-
bly to become misaligned, resulting in incorrect internal clearances. Also,
hammering on the shaft ends may damage the shaft centers.
Never dip or soak packings, rubber, plastic, or teflon parts in “dry” cleaning
solvent. Wipe with clean, lint-free cloth. Solvent can react with material and
result in severe damage or destruction of parts.
Do not use excessive force when installing seals. This could damage the seals,
causing them to leak. Use approved tools available from Edwards.
Do not rotate rotor assemblies until bearings have been installed and adjusted.
Damage to rotors and liners may occur.
Make sure liners fit into counterbore on endcase, and that they can be fully
seated into the endcase counterbore without using excessive force. Damage to
endcases and liners could occur.
Support ends of shafts axially with a jaw puller on the endcase when install-
ing ball bearings to avoid damaging liners and rotors. The jaw puller should
be used on the shaft end opposite the end where the bearing is being installed.
Use a shaft protector to avoid damaging shaft center.
Do not overtighten bearing adjusting nut setscrews. Excessive bearing preload
may result, causing bearing damage.
Rotary pumps have close running clearances. Thus, clean piping is a must.
Dirt, grit, weld bead or scale, flushed from an unclean piping system, will
damage and may stall the pump. Flush the system thoroughly before connect-
ing piping to pump.

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