moyno G2 User manual

MOYNO®
2000 Pumps
G2 Open Throat Models
G3 Bridge Breaker Models
Version 3 Models
SERVICE MANUAL

TABLE OF CONTENTS
Page
1-1. INTRODUCTION ........................................... 1
1-2. GENERAL............................................... 1
1-3. NAMEPLATE DATA ...............................1
1-4. Pump Rotation................................ 1
1-5. Model Number................................ 1
1-6. Frame Size Designation................. 1
1-7. Type Designation............................ 1
1-8. Trim Code....................................... 2
1-9. Variation of Standard Parts............ 2
2-1. INSTALLATION............................................. 2
2-2. GENERAL............................................... 2
2-3. PIPING................................................... 2
2-4. Suction Hopper............................... 2
2-5. Discharge Piping ............................ 2
2-6. FOUNDATION........................................ 2
2-7. SHAFT ALIGNMENT.............................. 3
2-8. On Coupling Connected Units........ 3
2-9. On Belt Drive Units......................... 3
2-10. WATER FLUSH OF PACKING............. 3
3-1. OPERATION................................................... 3
3-2. INITIALCHECK....................................... 3
3-3. START-UP.............................................. 3
3-4. PACKING LEAKAGE.............................. 4
3-5.G3 DRIVE ASSEMBLY ADJUSTMENT.. 4
4-1. MAINTENANCE ............................................. 4
4-2. GENERAL............................................... 4
4-3. PACKING ADJUSTMENT ...................... 4
4-4. PACKING REPLACEMENT ................... 4
4-5. LUBRICATION........................................ 5
4-6. Bearings ......................................... 5
4-7. Gear Joints ..................................... 5
4-8. G3 Oilers ........................................ 5
4-9. DISASSEMBLY OF G2 OPEN THROAT
PUMP..................................................... 5
4-10. Disconnect Pump ......................... 5
4-11. Packing Removal.......................... 5
4-12. Stator Removal............................. 5
4-13. Rotor Removal.............................. 6
4-14. Gear Joints and Conveyor Assembly
Removal ...................................... 6
4-15. Drive Shaft and Bearings Removal6
4-16. DISASSEMBLY OF G3 BRIDGE
BREAKER............................................ 6
4-17. Disconnect Pump........................6
4-18. Chain Replacement .................... 6
4-19. Torque Limiter Removal ............. 6
4-20. Shaft Gears Removal.................. 6
4-21. Breaker End Shafts or Paddle
Assembly Removal..................... 7
4-22. Drive Assembly Shafts Removal... 7
4-23. Packing Removal........................7
Page
4-24. CLEANING...................................................7
4-25. INSPECTION................................................7
4-26. Bearings..............................................7
4-27. Shafts..................................................7
4-28. Seals ...................................................7
4-29. Packing................................................7
4-30. Rotor....................................................8
4-31. Stator...................................................8
4-32. All Other Parts.....................................8
4-33. ASSEMBLY OF G2 OPEN THROAT PUMP .....8
4-34. Lubrication During Assembly ..............8
4-35. Packing Installation .............................8
4-36. Bearing Housing/Suction Housing
Assembly ............................................9
4-37. Bearing/Drive Shaft Assembly ............9
4-38. Rotor/Stator Assembly........................9
4-39. Rotor Gear Joint and Conveyor
Assembly ...........................................10
4-40. Drive End Gear Joint Assembly.........11
4-41. Stator Support/Discharge
Assembly ...........................................11
4-42. Final Assembly...................................11
4-43. Packing Adjustment ...........................11
4-44. ASSEMBLY OF G3 BRIDGE BREAKER.....11
4-45. Suction Flange Installation.................11
4-46. Packing Installation ............................11
4-47. Mounting Bearings .............................11
4-48. Paddle Assembly Installation.............12
4-49. Drive Assembly Installation................12
4-50. Final Assembly...................................12
4-51. STORAGE....................................................12
4-52. Short Term Storage............................12
4-53. Long Term Storage ............................12
4-54. PACKING SPECIFICATION........................13
4-55. VARIATIONS OF STANDARD PARTS .......13
4-56. Rotors.................................................13
4-57. Drive Shafts........................................13
4-58. STANDARD HARDWARE FOR G2 OPEN
THROAT......................................................14
4-59. SELECTING THE CORRECT PART...........15
4-60. PARTS LIST FOR G2 OPEN THROAT.......16
4-61. STANDARD HARDWARE FOR G3 BRIDGE
BREAKER ...................................................20
4-62. PARTS LIST FOR G3 BRIDGE BREAKER....20
4-63. CONVERSION FROM G2 TO G3................22
4-64. SHAFT SLEEVE ARRANGEMENT.............24
4-65. Disassembly.......................................24
4-66. Assembly............................................24
4-67. TROUBLESHOOTING.................................25
Note: This service manual outlines installation, operation and maintenance proce-
dures for the open throat “G2” and bridge breaker “G3” models of the Moyno
2000 pump. For information on the flanged (G1) models of the Moyno 2000
pump, refer to the G1 Service Manual, or contact your nearest Moyno pump
representative.

SERVICE MANUAL
MOYNO®2000 PUMPS
G2 Open Throat Models
G3 Bridge Breaker Models
1-1. INTRODUCTION
1-2. GENERAL
The Moyno
®
2000 Pump is the culmination of over
50 years of experience in manufacturing and marketing
fluids handling equipment. This rugged pump has
been engineered to be the most reliable product ever sold
under the Moyno name. The pump has been painstakingly
tested to assure consistent performance in the
most difficult of applications. It represents the next genera-
tion of the world’s most versatile pump.
The Moyno 2000 Pump is a progressing cavity pump. The
pumping action is created by a single helical rotor rolling
eccentrically in the double helix of the stator. The rotor in
conjunction with the stator forms a series of sealed cavities
180 degrees apart. As the rotor turns, the cavities progress
from the suction to the discharge. As one cavity diminishes,
the opposing cavity increases at exactly the same rate. Thus
the sum of the two discharges is a constant volume. The
result is a pulsation-free positive displacement flow utilizing
no valves.
1.3. NAMEPLATE DATA
The pump nameplate, located on the bearing housing,
contains important information relating to the operation and
servicing of the pump. This information includes the direction
of rotation arrow and the pump model and serial numbers
(see fig. 1-1).
The pump model number must be used for reference
when ordering spare parts. To simplify this procedure, the
model number for your pump has been recorded on the
nameplate drawing on the front cover of this manual. Please
carefully file this manual for further reference.
1.4. Pump Rotation. The direction of rotation is indicated by
a rotation arrow on the nameplate. Rotation of Moyno 2000
G2/G3 pumps is always clockwise, when viewed from the
driven end of the pump.
1-5. Model Number. The pump model number consists of
three component parts: Frame Designations, Type Designa-
tions and a Trim Code. A typical model number for example,
might be 2G065G2 CDQ AAA, as shown on the nameplate
in fig. 1-1.
1-6. Frame Designation. The Moyno 2000 is modular in
concept allowing for optimal matching of drive ends and
Figure 1-1. Typical nameplate showing rotation arrow,
model and manufacturing serial numbers.
pump elements (rotor and stator) to meet the requirements
of the application. The seven or more characters in the frame
designation describe the particular combination of drive end
and pump elements, as well as other construction details of
your pump.
The first character in the frame designation, always
a number, indicates the number of stages of the pumping
elements.
The second character is always a letter (E through K) and
indicates the drive end size.
The third, fourth and fifth characters are numbers indicat-
ing the theoretical capacity of the pumping elements per 100
revolutions.
The sixth character represents the type of universal joint
utilized. The letter G indicates a gear type joint. Other con-
figurations may be indicated by the letters P or F.
The seventh character, a number, indicates the type of
suction housing. Flanged suction port pumps are designated
by the numeral “1,” open throat pumps by the numeral “2”
and open throat pumps with a bridge breaker option by the
numeral “3.”
1-7. Type Designation. Following the Frame Designa-
tion is the Type Designation, a series of three letters describ-
ing the materials from which the pump is constructed.
Section:
MOYNO
®
2000 PUMPS
Page: 1
Date: October 2005

Page 2
The first letter identifies the material of the suction
housing.
C — Cast Iron
E — Carpenter 20 Stainless Steel
H — Hastelloy “C”
M — Monel
S — 316 Stainless Steel
W — Cast Steel
X — Special to application
Note: The bearing housing of the pump is always made
of cast iron.
The second letter indicates the material used in the
drive shaft, connecting rod, rotor and other wettable parts.
D — Alloy Steel
E — Carpenter 20 Stainless Steel
G — 416 Stainless Steel
H — Hastelloy “C”
J — 17-4 PH Stainless Steel
M — Monel
S — 316 Stainless Steel
X — Special to application
The third letter indicates the material of the stator. It identi-
fies only the stator material and not that of the tube in which
the stator is placed, which is always carbon steel. Standard
stator materials used in the Moyno 2000 pump are as fol-
lows:
B — EPDM 300, 70 Durometer
C — Nitrile 103, 50 Durometer
D — Tool Steel
E — Nitrile 110, 70 Durometer
F — Fluoroelastomer 500, 75 Durometer
G — 416 Stainless Steel
H — Hastelloy “C”
J — 17-4 PH Stainless Steel
K — Hypalon 800, 70 Durometer
M — Nitrile 100M 70 Durometer
P — Thiokol 70 Durometer
Q — Nitrile 100, 70 Durometer
R — Natural Rubber 200, 55 Durometer
T — Teflon 15% glass
U — Urethane 70 Durometer
X — Special to application
Z — White Nitrile 150,70 Durometer
A typical type designation such as CDQ, would identify the
following materials of construction:
C = Cast iron suction housing
D = Alloy steel rotor, drive shaft, connecting
rod and other minor metallic parts in con-
tact with the fluid being pumped.
Q = Nitrite (70 durometer) stator
1-8. Trim Code. Also included in the Model Number is the
three character Trim Code which is used to identify pump
construction. The letters “AAA” signify standard construction,
with letters other than “A” signifying variations. The first letter
identifies sealing variations; the second, internal variations;
and the third, rotor variations.
1-9. Variations of Standard Parts. Refer to Sections 4-55
thru 4-57 for variations available for modifying pumps to
meet specialized pumping conditions. If the trim code of your
pump is other than “AAA,” contact your nearest Moyno rep-
resentative for clarification. Do not modify your pump with
any variation unless you have determined that it is compat-
ible with your application.
2-1. INSTALLATION
2.2. GENERAL
Moyno pumps are lubricated and tested at the factory
prior to shipment and require minimum pre-start up
maintenance.
Accessibility to the pump and adequate clearance should
be a prime consideration in any installation. Enough space
should surround the unit so that maintenance can be car-
ried out with ease.
2-3. PIPING
2-4. Suction hopper used with open throat and bridge
breaker pumps should have nearly vertical sides, or be oth-
erwise designed to enhance the flow of the material into the
pump.
2-5. Discharge piping diameter should generally be as
large as the pump ports unless fluid conditions indicate
otherwise.
An easily removable section of piping one-to-two times
longer than the connecting rod should be mated to the dis-
charge port. This will allow the rotor and stator to be re-
moved without having to remove the complete pump from
the base.
2-6. FOUNDATION
For maximum pump-driver unit life, each unit should be
mounted on a strong, fabricated-steel base plate which can
be ordered from Moyno. The base plate should be mounted
on a concrete foundation built on a solid base. The foundation
should be approximately 4” to 8” longer and wider than the
base for which it is built. (See fig. 2-1.) Anchor bolts for the
base plate should be located in the foundation.
Figure 2-1. Typical Foundation Example
Check the base plate surface with a carpenter’s level
and place shims under the base plate at the places
necessary to make it level. Then check the pump,
driver shaft and the pump ports to ensure that they are level.
Complete base mounted units supplied by Moyno including
pump and driver are leveled with respect to the base at the
factory. Shifting may occur during shipment. The pump and
driver should be realigned. Care should be exercised to en-
sure that all components are level and mounted in a direct line.

For maximum rigidity and lower noise levels the base
plate should be grouted to the foundation after the anchor
bolts have been evenly tightened. A good grade of non-
shrink grout is recommended. The spaces between the base
plate and the foundation around the shims should also be
filled with grout. Allow the grout to dry according to manufac-
turer’s instructions, then fully tighten the anchor bolts.
2-7. SHAFT ALIGNMENT
Although the base-mounted units supplied by Robbins &
Myers are leveled with respect to the base before shipping,
most of the larger pump and driver units are shipped with the
flexible coupling disconnected.
After the base has been bolted down to the foundation,
check the following conditions:
2-8. On coupling connected units, be sure that the pump
and driver shafts are realigned before the coupling is con-
nected. Care should be exercised to ensure that all compo-
nents are level and mounted in a direct line.
Check gap between coupling halves (refer to coupling
manufacturers recommendations). Adjustment can usually
be accomplished by loosening the mounting bolts on either
the pump or driver and moving the loosened component into
alignment with the fixed component. On couplings with equal
diameter hubs, it may be helpful to lay a straight edge axially
across the coupling halves to check alignment.
2-9. On belt drive units, check to ensure that sheaves or
sprockets are in alignment. Check belts for proper tension.
Tension requirements will vary with type of belt, center dis-
tances, and belt speeds. Consult belt manufacturer for spe-
cific recommendation.
2-10. WATER FLUSH OF PACKING
The packing may be either grease lubricated through a
grease fitting in the stuffing box or have plumbing connected
to the housing to allow a water flush. Packing is not grease
lubricated at the factory prior to shipping.
When the material being pumped is abrasive, water flush-
ing the packing is recommended to extend shaft life.
Clean water can be injected through a 1/8” NPT tapped
hole that normally houses the grease fitting for lubricating the
packing. The water can be permitted to leak axially along the
shaft in either direction or can be removed from the second
tapped hole in the stuffing box. In both cases, the discharge
from the stuffing box should be throttled slightly to maintain
10-15 PSI higher pressure in the stuffing box than is present
in the suction housing. (See fig. 2-2.) Flow rate should be
approximately 1/2-2 gpm.
If mechanical seals are to be used on the unit, consult the
seal manufacturers’ instructions for seal flush requirements.
3-1. OPERATION
3-2. INITIAL CHECK
Before putting the pump into operation, the following items
should be checked to ensure that each piece of equipment is
installed correctly:
—Pump, driver, coupling or sheave alignment.
Page 3
Figure 2-2. Typical water flush arrangement for units
with packing includes strainer valve (1), sight flow meter
(2), pressure regulating valve (3), solenoid valve (4),
pressure gauge (5), and needle valve (6).
— Electrical connections
— Gauges and other instruments.
— Water flush connection to the stuffing box.
— Pump rotation. Normal rotation is indicated on the
nameplate on the bearing housing.
— All valves should be open on both suction and
discharge sides of pump.
CAUTION: This is a positive displacement pump. Do not
operate it against a closed valve.
3-3.START-UP
CAUTION: DRY OPERATION IS HARMFUL TO THE PUMP!
Never allow the pump to operate without liquid,
as dry operation will cause premature wear of
the stator and possible damage. The stator is
lubricated by the liquid which is pumped.
1. Before operating the pump for the first time, fill it with
liquid (the pipe plug tap on the suction housing may be used
for filling). If the liquid to be pumped is highly viscous, dilute
it before filling the pump. The liquid fill-up will lubricate the
stator for the initial start-up.
Note: If the pump is shut down temporarily, enough liquid
will remain in the system to provide lubrication upon
restarting. It is advisable to maintain the suction pip-
ing at a higher elevation than the centerline of the
pump in order to contain some liquid in the pump at
time of shutdown.
2. Once the pump has been filled with liquid, check for di-
rection of pump rotation by momentarily starting and stop-
ping the drive. Check rotation arrow on pump nameplate for
correct rotation.
3. If applicable, turn on the seal water to packing.
4. Start pump.
3-4. PACKING LEAKAGE
A packed stuffing box is designed to control leakage, not
stop it completely. Leakage is generally necessary to reduce
friction and dissipate heat. The amount of leakage necessary
will depend on the fluid pumped, the installation, and pump
speed and type. Refer to Section 4-3 for packing adjustment.

Page 4
Moyno 2000 pumps have been designed for minimum
stuffing box leakage when properly maintained. If leakage
cannot be tolerated, then a mechanical seal should be used.
3-5. G3 DRIVE ASSEMBLY ADJUSTMENT
Ensure that the chain on the drive assembly has no bows.
The chain tension can be adjusted by loosening or tightening
the idler adjusting screw (E, F,fig. 4-10).
The chain tension should be checked again and read-
justed after the first 20 hours of operation.
The assembled torque limiter (3) and sprocket (4) on the
bridge breaker assemblies are set at the factory to a reading
of 540 lbs on a spring scale. (See fig. 3-1.) If during opera-
tion the torque limiter slips, the torque should be checked
and if necessary, reset. To check the torque limiter setting,
use a spring scale as shown in the diagram with a properly
sized chain to fit the sprocket (4). Attach the scale to the
chain and pull, noting the value on the scale dial when the
torque limiter slips. To adjust the torque, loosen the three
capscrews on the torque limiter collar. Turn the collar clock-
wise to increase torque, or counter-clockwise to decrease it.
Tighten capscrews until heads bottom and again check the
torque setting. Repeat this process until the slipping point is
within 5 lbs of the 540 lb value. When the correct torque is
achieved, tighten setscrew to lock collar in position.
Figure 3-1. Torque Setting Diagram
4-1. MAINTENANCE
Note: In this section, the first reference to each pump part
will be followed by a number or a letter in parentheses
( ). These numbers and letters are those used to iden-
tify the pump parts and hardware items in the foldout
Exploded Views (fig. 4-7 or 4-10 as indicated).
4-2. GENERAL
The Moyno 2000 pump has been designed for a minimum
of maintenance, the extent of which is routine adjustment
and lubrication of packing. The pump is one of the easiest to
work on, in that the main elements are very accessible and
require few tools to disassemble.
4-3. PACKING ADJUSTMENT
Pumps. Packing gland nuts should be evenly adjusted so
they are little more than finger tight. (See fig. 4-1.) Over-
tightening of the packing gland may result in premature
packing failure and possible damage to the shaft and gland.
When packing is new, frequent minor adjustments during
the first few hours of operation are recommended in order to
compress and seat the packing.
1. Upon initial start-up of the pump, adjust the gland nuts
for a leakage rate of 1-2 drops per second until the packing
has seated and adjusted to the operating temperature (ap-
proximately 10-15 minutes).
2. If leakage is excessive after 15 minutes of operation,
tighten the gland nuts until a desired leakage rate is ob-
tained.
CAUTION: Do not tighten until zero leakage is obtained.
Over-tightening of the packing gland may
result in accelerated wear on the packing
and damage to the shaft. In those situations
where no packing leakage can be tolerated,
consult your Moyno Authorized Service
Representative.
Figure 4-1. Cross Section of Stuffing Box
Bridge Breaker. Packing for the bridge breaker is ad-
justed by means of cylindrical packing glands (25, fig. 4-10)
which are threaded into the bearing retainers (28). Holes in
the packing gland allow the use of a punch to rotate the
gland. The packing is compressed by rotating the gland in a
clockwise direction when viewed from the shaft end.
4-4. PACKING REPLACEMENT
When leakage can no longer be regulated by tightening
the gland nuts, remove and replace the packing. The entire
pump need not be disassembled to replace the packing.
Briefly, replace as follows:
1. Remove packing gland nuts (E, fig. 4-7), and slide
gland (12) and slinger ring (11) back along drive shaft (4).
2. Use a pair of packing extractors (fig. 4-2) to remove
three packing rings (10), lantern ring halves (13) and three
additional packing rings (10).
3. Inspect surface of drive shaft for excessive wear or
grooves due to packing rub. If shaft is worn, or is badly
scored or grooved, it should be replaced.

Figure 4-2. Packing Removal Tool
4. If drive shaft is not worn, install three rings of packing,
the lantern ring halves, and four more rings of packing; lubri-
cating them before installation with a good grade of packing
grease. Be sure to stagger the packing ring joints at 90° in-
crements. (See Section 4-35.)
CAUTION: Always use a proper packing tamper tool to
install packing. Do not use a pointed or
sharp tool, as damage to the packing mate-
rial or drive shaft could result. To assure
proper shaft lubrication, never use a one-
piece spiral wrap packing.
5. Replace packing gland and secure with packing gland
nuts. (See fig. 4-1.)
6. Adjust packing per Section 4-3.
4.5. LUBRICATION
4.6. Bearings. The bearings are lubricated at the factory
and will only need to be re-lubricated when the shaft/bearing
assembly is removed from the pump. (See Section 4.34.)
4-7. Gear Joints. Both gear joints are packed with lubri-
cant during assembly, and will only need to be re-lubricated
when gear joints are disassembled. (See Section 4-34.)
4-8. G-3 Oilers. Ensure that both oilers (item 1, fig. 4-10)
are filled with a suitable SAE 30 or 40 weight oil.
4-9. DISASSEMBLY OF G2 OPEN THROAT PUMP
Note: In the following G2 disassembly instructions, the part
reference numbers are from fig. 4-7.
Note: The following instructions cover ONE procedure for
disassembling all pump components. Major pump
components can be disassembled in various ways
since specific installation location limitations will de-
termine method of component removal.
4-10. Disconnect Pump
1. Operate pump (preferably with clean water) to insure
rotor and stator are not dry.
2. Shut off pump.
3. Close suction and discharge valves.
4. Turn off flush water to packing or mechanical seal,
if used.
5. Disconnect power source.
6. Drain any fluid in pump.
7. Remove inspection plate (17) and gasket (18).
Page 5
4-11. Packing Removal
1. Stop pump.
2. Complete Section 4-10, steps 2 - 6.
3. Remove gland adjustment nuts (E) and gland halves
(12) from stuffing box.
4. Remove packing rings (10). This is best done by using
flexible packing extractors (see fig. 4.2). Use two extractors
simultaneously on opposite sides of each ring. Pull evenly.
5. Remove lantern rings (13) in similar fashion. Twist split
rings to remove from shaft.
6. Remove additional packing rings.
4-12. Stator Removal
1. Complete Section 4-10.
2. Remove section of discharge pipe attached to dis-
charge flange (45).
3. Remove discharge flange (45) by unbolting from stator
clamp ring (40B) and remove stator gasket (42). Remove
stator retaining ring (43) and stator clamp ring (40B) from
stator (44).
Note: Omit above step 3 when using following method 6a to
separate rotor and stator.
4. Remove top half of stator support (41).
5. Unbolt stator clamp ring (40A) from adapter flange
(21) and suction housing (19). Remove stator gasket (42).
Use a screwdriver tip to carefully remove stator retaining
ring (43). (See fig. 4-3.) Remove stator clamp ring (40A)
from stator (44).
Figure 4-3. Typical Retaining Ring Removal
6. Pull stator (44) off rotor (37).
Note: On multiple stage pumps, or when also cleaning,
checking or changing stator (44), rotor (37) and/or
gear joint assembly, one of the following procedures
is suggested.
6a. Use winch-type device if anchored directly opposite
stator end. Attach cable to discharge flange (45) to pull sta-
tor (44) off rotor (37).

Page 6
6b.Hold stator (44) with pipe or strap wrench and turn
drive shaft (4) clockwise to force stator (44) off rotor (37).
7. Check rotor (37) and stator (44) for wear. See Rotor
(4-30) and Stator (4-31) for instructions.
4-13. Rotor Removal
1. Complete sections 4-9 and 4-11.
2. Remove stator adaptor (21) and O-ring (20) from suc-
tion housing (19).
3. Remove hopper or suction piping from suction
housing (19).
4. Remove socket head pipe plug (P) and set screw (Q)
from gear joint shell (36).
5. While supporting weight of rotor, remove six socket
head screws (N) from head ring (39), and slide head ring
(39) and O-ring (38) off rotor. Separate rotor from gear joint.
Note: If rotor-end gear joint is not accessible, disassemble
drive-end gear joint by following the procedure in sec-
tion 4-14, steps 1-3. Then remove both the conveyor
assembly and rotor from suction housing as a single
unit.
4-14. Gear Joints and Conveyor Assembly Removal
1. Complete sections 4-9 thru 4-12.
2. Remove pipe plug (P) from gear joint shell (33).
Remove six socket head screws (N) from gear joint retainer
(34), and slide retainer and O-ring (24) toward conveyor
flight.
3. Pull conveyor assembly (35) from drive-end gear joint
until it is separated from gear joint shell (33) and completely
separated from suction housing (19).
4. Remove lock nut (28) from drive-end of conveyor as-
sembly, and slide gear ball (29), secondary thrust plate (30),
seal support (31), gear joint seal (32), and gear joint retainer
(34) from conveyor assembly.
5. Remove two keys (26), ring gear (27), and primary
thrust plate (25) from gear joint shell (33).
6. The other gear joint is disassembled in a similar man-
ner by first removing primary thrust plate (25) from rotor
head. Remove two keys (26) from gear joint shell.
7. Slide gear joint shell (36) toward flight on conveyor
assembly. Remove lock nut (28) from end of conveyor
assembly (35). Remove ring gear (27), gear ball (29),
secondary thrust plate (30), seal support (31), and gear
joint seal (32). Then slide gear joint shell (36) from conveyor
assembly.
Note: It is recommended that each time a gear joint is dis-
assembled, the O-rings and grease seal should be
replaced.
4-15. Drive Shaft and Bearings Removal
1. Complete sections 4-9 thru 4-13.
2. Remove drive coupling or V-belts and pulleys
from drive shaft (4).
3. Remove four socket head screws (O) from shaft
adapter (23), and remove adapter and gear joint shell (33)
from end of drive shaft (4).
4. Remove six hex head screws (A) from bearing cover
plate (2). Slide bearing cover plate (2) along with radial
grease seal (1) and O-ring (3) off drive shaft.
5. Drive shaft (4) and bearings can now be pulled out of
bearing housing (14), taking steps to support the weight of
the assembly as the bearings clear the housing. Remove
grease seal (9) from bearing housing (14).
CAUTION: The bearings are pressed on the shaft during
assembly. Care must be taken during
disassembly to avoid damaging the
bearings or shaft.
6. Remove bearing lock screw (7) from bearing nut (8).
Using suitable spanner wrench or soft punch and hammer,
thread lock nut off drive shaft.
7. Remove both halves of bearing spacer (6) from shaft,
and using suitable bearing press and adaptors, press bear-
ings off shaft.
4-16. DISASSEMBLY OF G3 BRIDGE BREAKER
Note: In the following G3 disassembly instructions, the part
reference numbers are from fig. 4-10.
4-17. Disconnect Pump
1. Shut off pump.
2. Turn off flush water to packing or mechanical seal,
if used.
3. Disconnect power source.
4. Drain any fluid in pump.
4-18. Chain Replacement
1. Complete section 4-17, steps 1-3.
2. Remove oiler (1), oiler nozzle (1A), and guard (12).
3. Loosen idler arm adjusting screw (F) and remove
chain (9).
4. Install and connect chain (9). Tighten idler
adjusting screw (F). (See Section 3-5 for instructions
on chain tension.)

4-19. Torque Limiter Removal
1. Complete Section 4-17, steps 1-3.
2. Complete Section 4-18, steps 1-3.
3. Loosen set screw on torque limiter (3), and remove key
from shaft (17). Pull torque limiter (3) and sprocket (4) from
shaft (17).
4-20. Shaft Gears Removal
1. Complete Section 4-17, steps 1-3.
2. Complete Section 4-18, steps 1-3.
3. Loosen set screws on drive sprocket (33) and remove.
4. Remove two bolts attaching chain cover (5) to the
pump body.
5. Remove four screws (A) that hold gear cover (8) in po-
sition. Remove screws (B) that attach oil tray (12) to gear
cover (8). Separate these parts and remove.
6. Remove bolts (C) and lockwashers (D) that attach
bearing support (11) to the pump body.
7. Loosen set screws on two sets of bearings (27) located
toward drive end of pump.
8. Slide entire assembly, consisting of shafts No. 1 and
No. 3 (17 and 18), gears (16), bearing support (11), etc. to-
ward drive end of pump and away from suction flange (31).
9. Loosen bolts on gears (16), and remove keys (M) in
order to slide gears (16) off the shafts (17 and 18).
4.21. Breaker End Shafts or Paddle Assembly Removal
1. Complete Section 4-17.
2. Remove guard (19).
3. Loosen set screws on bearings (27) at discharge end
of pump. Unbolt bearing retainer (28) from suction flange
(31). Pull bearing retainer (28) from shafts (22). Remove
spacer (30), and pull shafts (22) out of stuffing boxes and
paddle assemblies (21).
4. Pull paddle assemblies (21) toward discharge end of
pump to free from drive shafts (17 and 18).
4-22. Drive Assembly Shafts Removal
1. Complete Section 4-17, steps 1-3.
2. Complete Section 4-18, steps 1-3.
3. Complete Section 4-19.
4. Complete Section 4-20.
5. Remove bearing cover plate (6).
6. Loosen set screws on both flange block bearings (10).
Page 7
7. Pull both shafts (17 and 18) from bearings (10) and
bearing support (11).
4-23. Packing Removal
1. Complete section 4-17.
2. Remover oiler (1) nearest discharge end of pump.
3. Loosen set screws on all four bearings (27).
4. Unbolt both bearing retainers (28) from suction flange
(31). Bearing retainer on the discharge end can be removed
from shafts (22). Slide drive end bearing retainer back on
shafts (17 and 18) to the gears (16).
5. Remove packing rings (23) and lantern rings (24) with
flexible packing puller tool (fig. 4-2). Use two puller tools
simultaneously on each ring. Pull evenly.
4-24. CLEANING
Clean all parts in a suitable cleaning solvent being careful
to observe all safety precautions regarding the use of sol-
vent.
4-25. INSPECTION
4-26. Bearings. After cleaning, rotate bearings very slowly
under hand pressure to feel for smoothness and even action.
Never spin a dry bearing. Check for cracks, galling, pitting,
burrs, etc. Replace bearing if there is any doubt concerning
complete serviceability.
4-27. Shafts. Inspect all shafts for scoring, burrs, cracks,
etc. Replace as necessary.
Figure 4-4. Measuring Rotor Dimension

Page 8
4-28. Seals. It is sound practice to always replace grease
seals (1 and 9, fig. 4-7) whenever drive shaft and tapered
roller bearings are removed.
4-29. Packing. It is sound practice to always replace pack-
ing whenever the pump bearing housing or G3 bearing re-
tainers are disassembled.
4-30. Rotor.
1. To check for excessive wear of rotor (37, fig. 4-7),
measure the rotor crest-to-crest diameter (see fig. 4-4) and
compare with the following chart:
Rotor
Capacity Standard *Crest to Crest Dia. (inches)
008 2.772 + .000/—.004
012 2.676 + .000/—.004
022 3.425 + .000/—.004
036 4.015 + .000/—.004
050 4.015 + .000/—.004
065 4.906 + .000/—.004
090 4.906 + .000/—.004
115 5.709 + .000/—.004
175 6.584 + .000/—.004
335 5.800 + .000/—.005
345 7.260 + .000/—.004
620 7.128 + .000/—.005
800 9.068 + .000/—.004
*These dimensions are applicable for AAA trim codes only.
Note: The rotor is designated by the third, fourth and fifth
numbers in the Model Number, La., 2G065G2.
2. If the measured crest to crest diameter is within 0.010
inch of the standard value and is free of deep nicks, gouges,
or other surface defects, the rotor is re-usable.
3. Rotors with crest to crest values 0.011 to 0.050 inch
under the standard values should be replaced. These rotors
can be renewed by chrome plating to standard dimensions
provided that:
a. The key slots are not excessively worn.
b. The rotor surface is not cracked, pitted or deeply
grooved (1/32 inch or more).
c. The base surface metal is not pitted or corroded.
4. Rotors may be sent to Moyno or any other competent
plating shop. Rotors should be stripped and replated to
standard dimensions, then buffed.
4-31. Stator. A worn stator may appear pitted and gouged,
or may appear smooth similar to when new. Performance is
the best measure of rotor to stator fit. If unable to measure
performance adequately, suspected stator wear can be
evaluated by a Moyno sales or factory representative.
4-32. All Other Parts. Check for cracks, excessive wear,
damage to threaded holes, burrs, etc. Replace as neces-
sary. Replace O-rings and all gaskets at each disassembly
and reassembly.
4-33. ASSEMBLY OF G2 OPEN THROAT PUMP
Note: In the following G2 assembly instructions, the part
reference numbers are from fig. 4-7.
The Moyno 2000 pumps are reassembled in the
reverse order of dismantling. The following suggestions
are offered:
1. While pump is dismantled, check all gaskets, seals,
packing, and O-rings. Replace all worn items. It is rec-
ommended that the gear joint seals (32), gear joint O-rings
(24, 38) and stator O-ring (20) be replaced each time either
of the gear ioints is disassembled.
2. During the assembly process, cleanliness is impor-
tant. To avoid premature failure, bearings and gear joint
components must be handled with care and kept clean.
4-34. Lubrication During Assembly
Note: The bearings are lubricated at the factory, and will
only need to be re-lubricated when the shaft/bear-
ing assembly is completely removed from pump.
1. Bearings. Pack bearings after installation on
shaft (Section 4-37). Lubricant should be packed around
all of the rollers and should completely cover the faces
of the races. The void inside the spacer between
the bearings should be filled approximately half
way with lubricant.
2. Gear Joints. Both gear joints should be packed with
lubricant during assembly (Sections 4-39 and 4-40). DO
NOT use zerk fittings to lubricate gear joints after assembly.
The pipe plugs (C) in the gear joint shells are vent plugs and
MUST BE REMOVED during assembly of the gear joints to
allow excess lubricant to vent from the gear joints.
3. Packing. Lubricate packing rings during assembly.
Additional grease can be added after assembly through
the zerk fittings installed in the side of the stuffing box.
4. Approved lubricants:
CAUTION: Do not mix different brands of lubricants for
the same application.
Area to Lubricate Approved Lubricant or Equivalent
Bearings, Gear Joints
& Packing ACG-2 (Dubois Chemical, Inc.)
4-35. Packing Installation
1. The standard packing set (10) consists of six braided
packing rings and two teflon lantern ring halves (13).
2. Install packing and lantern ring halves into the stuffing
box area of the suction housing (19) in the following se-
quence:
a. Wipe a film of lubricant on each packing ring and
install three rings. Push each ring firmly in place.
Note: Install the packing rings with the splits staggered at 90
degrees to the adjacent ring of packing. On initial as-
sembly, one ring of packing may not fit in stuffing box.
This final ring of packing should be installed after
pump is started and packing is seated.

CAUTION: Always use a proper packing tamper tool to
install packing. Do not use a pointed or
sharp tool, as damage to the packing mate-
rial or drive shaft could result. To assure
proper shaft lubrication, never use a one-
piece spiral wrap packing.
b. Install the two lantern ring halves with the flat side
against the packing.
c. Install final four packing rings, firmly pushing each
ring into place.
3. Install packing gland studs (F), packing gland halves
(12), and gland adjusting nuts (E). Tighten nuts finger tight at
this time.
4-36. Bearing Housing/Suction Housing Assembly. This
procedure may be performed now or after the bearing)/drive
shaft assembly is installed in the bearing housing.
1. Place clamp ring (16) on suction housing (19) and
install retaining ring (15) in groove on suction housing.
2. Slide turned diameter of suction housing into bore on
end of bearing housing (14). Align holes in clamp ring (16)
with four threaded holes in bearing housing (14) and thread
four hex head screws (K) with lock washers into threaded
holes. Tighten finger tight.
3. Align suction flange to desired position (if not already
fastened to piping) and tighten four hex head screws (K).
Note: Refer to Torque Requirement Chart (page 13) for the
proper torque requirement for all threaded fasteners.
4-37. Bearing/Drive Shaft Assembly
1. Bearings must be pressed on the shaft in the following
sequence: [Larger units (G drive end and larger) require
heating of the bearings to 250°F for assembly.]
a. Press bearing cone on shaft (4), making sure rollers
face in proper direction to receive cup (step b). Cone should
be pressed firmly against shoulder on shaft.
b. Place cup on rollers.
c. Place bearing spacer (6) halves on cup.
d. Place second cup on spacers.
e. Press second bearing cone on shaft with rollers fac-
ing seat in cup. Cone should be pressed on until face of
cone is flush or even with shoulder on shaft.
CAUTION: Do not press second cone past shoulder
on shaft.
2. Thread bearing nut (8) on shaft (4) and tighten until it
rests against the shoulder on the drive shaft. Install brass tip
set screw (7) in bearing nut and tighten.
Page 9
Note: The tapered bearings are designed such that when
properly installed there may be a very slight end play
in the bearings (bearing spacer halves may slip freely
out of place) or they may have a slight pre-load (bear-
ing spacer halves held tightly in place and bearings
do not turn freely).
3. Remove bearing spacer halves (6). Thoroughly pack
lubricant around rollers and on bearing races. Install one half
of bearing spacer. Fill area between bearings half full of lu-
bricant, and install other half of bearing spacer.
Note: An alternate method of lubricating bearings is as fol-
lows: Pack the rollers of the first cone immediately af-
ter it is pressed on shaft. Lubricate face of first cup
before it is installed. Place bearing spacer halves in
place and fill half full of lubricant. Lubricate race of
second bearing cup and place on spacer. Pack rollers
of second cone with lubricant, and press on shaft until
flush with shoulder.
Note: If too much grease is packed into the bearings during
assembly, it may seep from the grease seals during
the first few hours of operation until the proper lubri-
cant level is achieved. This lubricant should be wiped
from the seal area, when the pump is not operating, to
prevent contaminants from collecting in the seal area.
4. Install (light press) grease lip seals (1 and 9) into bear-
ing cover plate (2) and bearing housing (14). The lip of the
seals should be facing out, and lips of seal should be wiped
with lubricant.
5. Install drive shaft with bearings in bearing housing, be-
ing careful to avoid damaging the grease seal (9). Slide
slinger ring (11) over drive shaft.
6. Place O-ring (3) on bearing cover plate and bolt bear-
ing cover plate to bearing housing using six hex head screws
(A) and lock washers. The six screws should be tightened
evenly, and care should be taken to insure the 0-ring be-
comes seated in the step in the bearing housing. When the
bearing cover plate is fully secured to the bearing housing, a
small gap of 0.010 to 0.020 inch will exist between the bear-
ing cover plate and the bearing housing.
4-38. Rotor/Stator Assembly
1. Slide head ring (39) and O-ring (38) over rotor (37)
contour to the rotor head. The side of the head ring with the
smallest diameter holes should be facing the rotor head.
Note: On some models the head ring is a two-piece com-
ponent which eliminates this step.
2. Slide stator clamp rings (40) on both ends of the stator
(44) and secure in position with retaining rings (43).
3. Coat the rotor (37) contour with waterless hand
cleaner, glycol or other lubricant compatible with the stator
elastomer. Insert rotor into stator so that rotor head is at the
specified distance from the end of the stator (Dimension “A,”
fig. 4-5).
Note: Turning the rotor counterclockwise while inserting
into stator will ease assembly.

Page 10
4. Insert primary thrust plate (25) into rotor head,
flat side first. Thrust plate and rotor head surfaces must be
flush to assure proper assembly and operation of the pumps
(See fig. 4-6.)
Figure 4-5. Rotor Installation
Figure 4-6. Rotor Thrust Plate Seating Detail
4-39. Rotor Gear Joint and Conveyor Assembly
1. After lightly lubricating, position O-ring (24) onto outer
diameter slot of shaft adapter (23). With six socket head
screws (N), attach shaft adapter to gear joint shell (33), be-
ing careful that O-ring is maintained in its proper position.
Evenly tighten the six screws.
2. After lightly lubricating, position O-ring (22) into inside
diameter slot of shaft adapter (23). Position shaft adapter
(23) over end of drive shaft (4) so that the two pins
(C) in end of drive shaft fit into the non-tapped, counter-
bored holes of shaft adapter (23). Check that the O-ring is
properly seated. Thread four socket head screws (O)
through shaft adapter and into threaded holes in drive
shaft. Evenly tighten the four screws (O).
3. Place stator adapter (21) on suction end of stator
(44) with its flat side against stator. Place O-ring (20)
around the step in stator adapter.
4. Slide gear joint shell (36) on end of conveyor as-
sembly (35) with larger diameter opening facing out. Fit a
gear joint seal (32) onto conveyor assembly (35). The seal
must be positioned so that flat face of seal neck fits into
seal retainer component of conveyor assembly. Apply a
small coating of approved gear joint lubricant to inside
surfaces of seal.
5. Apply a small amount of lubricant to the flat face of
seal support (31), and slide it onto conveyor assembly so
that flat face of support is against seal (32).
6. Grease the concave spherical surface of rear thrust
plate (30), and position thrust plate against seal (32) with
lip on outside diameter of seal fitting the step on back side
of thrust plate.
7. Apply a film of grease to splines on inside of gear
ball (29). Install gear ball on conveyor assembly (35) with
counterbored end (end without splines) first on conveyor
assembly. Gear ball should slide freely against shoulder
on conveyor assembly. Place lock nut (28) on conveyor
assembly, and tighten against gear ball. Apply grease to
spherical surfaces and teeth of gear ball.
8. Apply grease to teeth of ring gear (27), and slide
ring gear onto the gear ball (29). When ring gear is in
place, keyways should be facing lock nut end of connect-
ing rod.
9. Apply a thin coating of grease to spherical surface
of thrust plate (25) already installed in rotor head. Fill the
recessed area in rotor head with grease.
10. Slide gear joint shell (36) over assembled gear joint
components, being careful to seat outside diameter of
gear joint seal (32) in end of gear joint shell (36). The two
tapped holes in gear joint shell should be in line with one
of the keyways in ring gear.
11. Place keys (26) in keyways in ring gear. Check to
insure the tapped holes in the side of gear joint shell are
aligned with one of the keyways.
12. Align the keys in ring gear with the keyways in rotor
head. Slide assembled gear joint shell onto rotor head,
checking to be sure the keys are properly engaged in rotor
head and ring gear. The shallow hole in rotor head should
ne aligned with the first threaded hole in outside of gear
joint shell. Thread set screw (Q) into threaded hole in shell
until light contact is made with the hole in rotor head.
13. Place O-ring (38) into step in gear joint shell. Align
holes in head ring (39) with six threaded holes in end of
gear joint shell, and install stainless socket head screws
(N). Tighten the six socket head screws evenly, checking
to insure O-ring (38) remains in place. When tightened
properly, a small gap of a few thousandths of an inch may
exist between shell (36) and head ring (39).

14. Excess grease in the assembly will be purged from
the vent hole while the socket head screws are tightened.
Tighten set screw (Q) in shell. Move the free end of con-
veyor assembly in a circular motion to assure that the joint is
free and assembled properly. This will also help to purge
excess grease from the assembly.
15. Install stainless steel pipe plug (P) in the second hole
in the shell and tighten.
4-40. Drive End Gear Joint Assembly
1. On the other end of conveyor assembly (35), slide the
gear joint retainer (34), with flat side toward conveyor, until it
contacts the conveyor flight. After lightly lubricating, slide
O-ring (24) over slot in gear joint retainer (34). Fit a gear joint
seal (32) onto conveyor assembly (35). The seal must be
positioned so that flat face of seal neck fits into seal retainer
component of conveyor assembly. Apply a small coating of
approved gear joint lubricant to inside surfaces of seal.
2. Apply a small amount of lubricant to flat face of seal
support (31), and slide it onto conveyor assembly so that flat
face of support is against seal (32).
3. Grease the concave spherical surface of secondary
thrust plate (30), and position thrust plate against seal (32)
with the lip on outside diameter of seal fitting the step on
back side of thrust plate.
4. Apply a film of grease to the splines on inside of gear
ball (29). Install gear ball on conveyor assembly (35), with
counterbored end (end without splines) first on conveyor
assembly. Gear ball should slide freely against shoulder on
conveyor assembly. Place lock nut (28) on conveyor assem-
bly and tighten against gear ball. Apply grease to spherical
surfaces and teeth of gear ball.
5. Slide primary thrust plate (25) into gear joint shell (33),
with its flat side fitting into the recessed part of shaft adapter
(23). After lubricating, fit two keys (26) into the exposed
keyways in the shaft adapter (23). Liberally apply grease to
the teeth of ring gear (27). Insert ring gear (27) into gear joint
shell(33) with the keyway side inserted first. Align ring gear
so that the keyways are engaged with keys (26) that are in
shaft adapter (23).
6. Insert the gear ball assembly end of conveyor as-
sembly (35) into gear joint assembly until teeth of gear ball
and teeth of ring gear become meshed together. It may be
necessary to slightly turn drive shaft (4) until these teeth can
properly align to mesh together.
7. After the holes have been aligned, thread hex head
screws (T) and lockwashers thru stator clamp ring (40A),
stator adapter (21), and into threaded holes in suction hous-
ing (19). Evenly tighten the screws.
8. Slide gear joint retainer (34) into end of gear joint shell
(33), being careful that O-ring (24) remains in the slot, and
that gear joint seal (32) is properly seated in position. Rotate
gear joint retainer (34) until its holes become aligned with
threaded holes in end of gear joint shell (33). Thread six
socket head screws (N) into the holes and tighten evenly.
9. Insert stainless steel pipe plug (P) in threaded hole of
gear joint shell (33) and tighten.
Page 11
4-41. Stator Support/Discharge Assembly
1. Place top of stator support(s) (41) over stator and fas-
ten to bottom half of stator supports using hex head screws
(R).
2. Place stators gasket (42) in recess in discharge flange
(45) and position discharge flange on end of stator. Align
holes in stator clamp ring (36B) with threaded holes in dis-
charge flange, and install and tighten hex head screws (S)
and lockwashers.
4-42. Final Assembly
1. Install inspection plates (17) to suction housing (19)
with gaskets (18), using hex head screws (L) and
Iockwashers.
2. Install pipe plugs (M and J) and zerk fittings (G) in ap-
propriate threaded holes in suction housing. Install pipe
plugs (M) in threaded holes in bearing housing, or attach
drain lines if preferred.
3. Connect power source. Turn on flush water to packing
if used. Open suction and discharge valves, and start pump.
4-43. Packing Adjustment
For packing adjustment, refer to Section 4-3.
4-44. ASSEMBLY OF G3 BRIDGE BREAKER
Note: In the following G3 assembly instructions, the part
reference numbers are from fig. 4-10.
G3 Bridge Breaker parts are assembled in reverse order of
dismantling. The following suggestions are offered:
Note: While unit is dismantled, check all gaskets and
O-rings, and repack bearings.
4-45. Suction Flange Installation
Note: It is necessary to properly position suction flange
to suction port of pump, and secure before final
assembly.
1. Place gasket (32) and suction flange (31) on suction
housing flange of pump.
2. Attach suction flange (31) to suction housing of pump
with desired hardware.
4-46. Packing Installation
1. Insert three rings of packing (23), lantern rings (24) and
three additional rings of packing (23) into both stuffing boxes
on each end of suction flange (31). All but one ring may fit
into stuffing boxes. As the unit operates, the packing will
compress and the last ring can be added.
4-47. Mounting Bearings
1. Install seals (26) into both holes in bearing retainer (28).
2. Insert bearings (27) into bearing retainer (28).

Page 12
3. Thread packing glands (25) into threaded portions of
bearing retainer (28).
4. Bolt spacer (30) and bearing retainer (28), with small
threaded holes facing upward, to suction flange (31).
5. Bolt two flange block bearings (10), with zerk fittings
facing upward, to bearing support (11). Thread idler ad-
justing bolt (E, F) into bearing support (11).
6. Attach idler arm (7) to bearing support (11).
7. Belt bearing support (11) to pump body.
8. Repeat steps 1-4 for the set of bearings to be mounted
at the other end of suction flange (31).
4-48. Paddle Assembly Installation
1. Insert flattened end of shaft (17) into left bearings (10),
as viewed from drive shaft end of pump. Slide gear (16), with
hub towards suction flange onto shaft (17) and continue to
insert shaft (17) into bearing retainer (28) and suction flange
(31) until the flattened end appears in suction port of pump.
Place oil tray (12) under gears (16).
2. Repeat step 1 for the other shaft (18) into adjacent
bearings (10).
3. Insert oil tray (12) under gears (16).
4. Insert both shafts (22), flattened end first, into dis-
charge end bearing retainer (28) until they appear in suction
port of pump.
5. Insert O-rings (20) into slots on inside diameter of each
end of both paddle assemblies (21).
6. Place paddle assembly (21) on shaft (17). Push shaft
(22) into paddle assembly (21). Ensure that flat side of shafts
(17 and 22) are aligned with welded keys on paddle assem-
bly. Also ensure that both shafts (17 and 22) are completely
inserted into paddle assembly (21) and that the paddle as-
sembly is centered in suction flange (31).
7. Twist set screw collar onto bearings (27) opposite to di-
rection of rotation to lock into position. Tighten set screws in
bearings (10 and 27) at each end of suction flange (31).
8. Repeat steps 5 and 6 for other paddle assembly.
Ensure that paddle assemblies are opposite each other by
90 degrees.
9. Align gears (16), and install gear keys (M) on shafts
(17 and 18).
4-49. Drive Assembly Installation
1. Attach chain cover (5) to pump body with two of the six
head screws attaching bearing cover plate to pump.
2. Slide idler sprocket (15), sprocket side first, onto idler
shaft (14). Position idler shaft (14) thru irregular hole in chain
cover (5) and thread into idler arm (7).
3. Position key (L) on shaft (17), and slide torque limiter
(3) and sprocket (4) onto shaft (17).
4. Place drive sprocket (33) on drive shaft of pump with
set screws facing away from bearing housing.
5. Align torque limiter sprocket (4), idler sprocket (15)
and drive sprocket (33). Install chain (9) ensuring that pad-
dle assemblies remain 90 degrees apart, and tighten set
screws on torque limiter (3), drive sprocket (33), idler arm
(14), and idler sprocket (15).
4-50. Final Assembly
1. Ensure that all set screws are tightened.
2. Thread packing glands (25) into stuffing boxes
finger tight.
3. Ensure that all zerk fittings (G) are installed.
4. Attach oiler (1) and oiler nozzle (1A) to oiler support
(2). Attach oiler support to cover (13).
5. Attach bearing cover (6) to bearing support (11), and
chain cover No. 2 (13) to chain cover No. 1 (5). Attach
oiler support (2) to bearing cover (6).
6. Attach oiler (1) to gear cover (8), and screw cover (8)
to bearing support (11) at top of bearing retainer (28).
Screw oil tray (12) into gear cover (8).
7. Attach bearing cover No. 2 (19) to bearing
retainer (28).
4-51. STORAGE
4-52. Short Term Storage. Storage of 6 months or less
will not damage the pump. However, to insure the best
possible protection, the following is advised:
1. Store pump inside whenever possible or cover with
some type of protective covering. Do not allow moisture to
collect around pump.
2. Remove drain plug and inspection plates to allow the
pump body to drain and dry completely. Replace in-
spection plates.
3. Loosen the packing gland and inject a liberal amount
of grease into the stuffing box. Tighten the gland nuts only
hand tight. When water flush systems are to be used, do
not use grease. A small amount of light oil is recom-
mended.
4. See drive manufacturer’s instructions for motor and!
or drive storage.
5. See OPERATION Sections 3-1 through 3-5 before
start-up. Be sure all lubricants are in good condition.
4-53. Long Term Storage. If pump is to be in storage for
more than 6 months, perform the above short term storage
procedures plus the following:
1. Occasionally rotate the pump manually a few revo-
lutions to avoid a “set” condition of rotor in stator elas-
tomer. This will prevent hard starting and excessive torque
requirements when pump is again put into operation.

2. Apply rust inhibitor to all unpainted cast iron and
machined carbon steel surfaces.
3. Remove drive belts if applicable.
4-54. PACKING SPECIFICATION
Standard packing on all Moyno 2000 pumps consists of
braided PTFE fibers impregnated with ultrafine graphite.
Optional types of packing are available for food, high tem-
perature and other types of service. Consult your nearest
Moyno representative.
4-55. VARIATIONS OF STANDARD PARTS
Below are variations available for modifying pumps to
meet specialized pumping conditions. If the trim code of your
pump is other than “AAA,” contact your nearest Moyno
representative for clarification. Do not modify your pump
with any variation unless you have determined that it is com-
patible with your application.
The three-character trim code is designed as follows.
The first character identifies any sealing variations, the sec-
ond character identifies any internal variations, and the third
character identities any rotor variations.
The trim code ‘AAA” represents a pump with standard
features. Deviations from standard are to be indicated by
changing the appropriate character from the choices listed.
When two or more letters are combined, dashes are used to
separate the three areas of the trim code for clarity.
SEALING VARIATIONS
A — BRAIDED TEFLON & GRAPHITE PACKING,
(Black) Standard to all lines except Quick
Disassembly pumps. Optional on Quick
Disassembly pumps.
C — BRAIDED TEFLON PACKING, (White) Optional
packing on all lines,
D — DOUBLE MECHANICAL SEAL, Optional on all
lines. Not offered on #2 “L” frame.
F — BRAIDED TEFLON FOOD GRADE PACKING,
(White) Standard on all Quick Disassembly
pumps. Optional on all other lines.
G — 100% GRAPHITE PACKING, (Gray) Optional to
all lines.
H — FLUSH PACKING GLAND
S — SINGLE MECHANICAL SEAL, Optional on all
lines.
W — WATER FLUSH, Optional on all lines.
X — Special to application
Page 13
INTERNAL VARIATIONS
A — Standard plated shaft
B — Non-plated shaft
C — Solid drive shaft configuration
D — Grit seal, for ‘L” frame only
E — Extension tube with extended auger
F — Extended drive shaft (for back stop or large pulley)
G — Ceramic coating
S — Shaft sleeve
X — Special to application
ROTOR VARIATIONS
A — Standard size with chrome plating
B — Non-plated (no plating)
C — Standard undersize
E — Standard oversize
F — Counter clockwise rotation (Centennial line only)
G — Ceramic coating
X — Special to application
4-56. Rotors identified on parts listing are standard size with
hard chrome plated surface. Other variations of rotor size
and finish may be ordered by selecting the standard rotor
part number and changing the last digit of the rotor number
as follows:
2 = Standard size, non-plated
3 = Undersize, chrome-plated
4 = Undersize, non-plated
5 = Oversize, chrome-plated
Do not change rotor sizes without consulting your local
Moyno Sales Office. These variations are used for certain
specialized pumping conditions only.
4-57. Drive Shafts shown have hard-chrome plating on the
packing wear area. If non-plated drive shafts are required,
select the standard part number and change the last digit to
next higher number; example: PE0261 to PE0262.

Page 14
4-58. STANDARD HARDWARE FOR G2 OPEN THROAT
TORQUE GUIDELINES CHART
Note: Torque values are from the Industrial Fasteners
Institute and Craftsman Corp.

4-59. SELECTING THE CORRECT PART FOR YOUR MOYNO 2000 PROGRESSING CAVITY PUMP
PUMP MODEL SELECTION
Table 4-1 G-2 Parts List: Select G2 part number by Drive End (2G036G2 CDQ AAA) and Type Designation
(Page 16) (2G036G2 CDQ AAA) where listed.
Table 4-2 G2 Rotor: Select G2 Rotor part number by Type Designation (2G036G2 CDQ AAA), number of
(Page 18) stages (2G036G2 CDQ AAA), and Model (2G036G2 CDQ AAA).
Table 4-3 G2 Stator Clamp Ring: Select G2 Stator Clamp Ring part number by number of stages
(Page 18) (2G36G2 CDQ AAA) and Model (2G036G2 CDQ AAA).
Table 4-4 G2 Stator: Select G2 Stator part number by number of stages (2G036G2 CDQ AAA) and Model
(Page 18) (2G036G2 CDQ AAA).
Table 4-5 G2 Discharge Flange: Select G2 Discharge Flange by Type Designation (2G036G2 CDQ AAA),
(Page 18) number of stages (2G036G2 CDQ AAA), and Model (2G036G2 CDQ AAA).
Table 4-6 G3 Parts List: Select G3 part number by Drive End (2G036G3 CDQ AAA) and Type Designation
(Page 20) where listed (2G036G2 CDQ AAA).
Table 4-7 Shaft Sleeve (CD): Select Reference Number part by Drive End and Element (1 G036 CDQ AAA)
(Page 21) if Type Designation begins with CD (Shaft Sleeve Option only).
Table 4-8 Shaft Sleeve (CS & SS): Select Reference Number part by Drive End and Element (1G036 CSQ
(Page 21) AAA) if Type Designation begins with CS or SS (Shaft Sleeve Option only).
Page 15

Page 16
4-60. PARTS LIST FOR G2 OPEN THROAT.
Table 4-1. G2 Parts List

Page 17
FOLD OUT FOR EXPLODED VIEW OF PUMP
Notes