Pentair myers aplex Series Manual

NOTE! To the installer: Please make sure you provide this manual to the owner of the equipment or to the responsible
party who maintains the system.
MODELS
MA-240L, MA-240L-HD, MA-240M, MA-240M-HD, MA-240K,
SC-300L, SC-300,
RO-358L, RO-358
QUINTUPLEX PUMPS
INSTALLATION AND SERVICE MANUAL
Part # AP-03-101 | © 2014 Pentair Ltd. | 02/13/14

2 3
Engineering Data
MA-240L........................................................... 3
MA-240L-HD ..................................................... 4
MA-240M.......................................................... 5
MA-240M-HD .................................................... 6
MA-240K .......................................................... 7
SC-300L ........................................................... 8
SC-300 ............................................................. 9
RO-358L ......................................................... 10
RO-358........................................................... 11
Dimensional Data ...........................................12–13
Installation, Operation, Lubrication, Maintenance
and Storage Instructions....................................... 14
Safety ............................................................. 14
Storage............................................................ 14
Pump Location and Piping Design...................... 14
Suction Piping.............................................14–15
Acceleration Head ............................................ 15
Discharge Piping .............................................. 15
Bypass Piping .................................................. 15
Lubrication ...................................................... 16
V-Belt Drive ..................................................... 16
Direction of Rotation......................................... 16
Automatic (Safety) Shutdowns........................... 16
Suggested Piping System for Plunger Pumps ...... 17
Crankshaft Assembly............................................ 18
General ........................................................... 18
Tapered Roller Bearings .................................... 18
Cup Installation................................................ 18
Center Bearings................................................ 18
Installing Crankshaft ............................................ 18
Shim Adjustment of Tapered Roller Bearings....... 18
Installation of Crankshaft Oil Seal ...................... 18
Lube Oil Pump Assembly .................................. 19
Disassembly..................................................... 19
Connecting Rod, Crosshead, Extension Rod, Crosshead
Pin and Wiper Box Assembly/Disassembly .............. 19
General ........................................................... 19
Installing Wrist Pin Bushings............................. 20
Pinning the Crosshead ...................................... 20
Order of Assembly ............................................ 20
Precision Crankpin (Crankthrow) Bearings......20–21
Oil Scoop......................................................... 21
Wiper Box Assembly............................................. 21
General ........................................................... 21
“Poly Pak” Seal ............................................... 21
Mechanical Oil Seal.......................................... 21
Inserting the Extension Rod............................... 21
Stuffing Box, Packing and Plunger Assemblies ....... 21
General ........................................................... 21
Spring Loaded Packing ................................21–22
J-Style Stuffing Box & Plunger Assembly
(Styles 838 and 858) ....................................... 22
Inserting the Plunger ........................................ 22
Installing the Gland .......................................... 22
Installing the Stuffing Box................................. 22
Connecting the Plunger..................................... 23
Packing ........................................................... 23
Plungers.......................................................... 23
Disc Valve Systems and Abrasion Resistant
Valve Construction ............................................... 23
General ........................................................... 23
Disc Valve and Abrasion Resistant
Setting the Valve Seat....................................... 23
Installing O-Rings, Abrasion Resistant Spring
and Cage ......................................................... 23
Installing Disc, Spring, Disc Valves and Stem...... 24
Pulling the Valve Seat ....................................... 24
Salvage of Worn Seats....................................... 24
Trouble Location and Remedy ..........................25–27
Parts Lists......................................................28–34
Warranty ............................................................. 36

3
MA-240L ENGINEERING DATA
Power End
Model Quintuplex Pump MA-240L
Maximum Input HP at Speed 240 at 450 rpm
Rated Continuous Plunger Load 8,937 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 150 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Ductile Iron
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 75,000+hr
Liquid End
Plunger Size Range, Diameter 2-3/8" thru 3-1/2"
Maximum Continuous Working Pressure 1,683 psi
Hydrostatic Test:
Discharge
Suction
2,525 psi
425 psi
Discharge Connection Size 3" NPTF
Suction Connection Size 6" NPTF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze
Forged Steel Block
Ductile Iron
Stainless Steel
B148-C955
A105
A536 80-55-06
Various Grades
MA-240L ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Stainless Steel, Hardened
Carbon Steel
B148-C955
17-4PH
1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 6.26 sq. in.
Average Liquid Velocity, 3-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.42 fps
18.1 fps
General
Overall Dimensions:
Length
Width
Height
52-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End
With Forged Steel Liquid End
3,240 lbs.
3,600 lbs.

4 5
MA-240L-HD ENGINEERING DATA
Power End
Model Quintuplex Pump MA-240L-HD
Maximum Input HP at Speed 275 at 450 rpm
Rated Continuous Plunger Load 10,300 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 150 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Nitrided
Forged Steel
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 60,000+hr
Liquid End
Plunger Size Range, Diameter 2-3/8" Thru 3-1/2"
Maximum Continuous Working Pressure 1,683 psi
Hydrostatic Test:
Discharge
Suction
2,525 psi
425 psi
Discharge Connection Size 3" NPTF
Suction Connection Size 6" NPTF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze
Forged Steel Block
Ductile Iron
Stainless Steel
B148-C955
A105
A536 80-55-06
Various Grades
MA-240L-HD ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Stainless Steel, Hardened
Carbon Steel
B148-C955
17-4PH
1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 6.26 sq. in.
Average Liquid Velocity, 3-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.42 fps
18.1 fps
General
Overall Dimensions:
Length
Width
Height
52-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End
With Forged Steel Liquid End
3,240 lbs.
3,600 lbs.

5
MA-240M ENGINEERING DATA
Power End
Model Quintuplex Pump MA-240M
Maximum Input HP at Speed 240 at 450 rpm
Rated Continuous Plunger Load 8,937 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 150 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Ductile Iron
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 75,000+hr
Liquid End
Plunger Size Range, Diameter 1-1/2" Thru 2-1/4"
Maximum Continuous Working Pressure 3,600 psi
Hydrostatic Test:
Discharge
Suction
5,400 psi
425 psi
Discharge Connection Size 2" NPTF
Suction Connection Size 4" NPTF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze B148-C955
MA-240M ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Carbon Steel
B148-C955
1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 2.35 sq. in.
Average Liquid Velocity, 2-1/4" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.19 fps
16.7 fps
General
Overall Dimensions:
Length
Width
Height
50-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End 3,580 lbs.

6 7
MA-240M-HD ENGINEERING DATA
Power End
Model Quintuplex Pump MA-240M-HD
Maximum Input HP at Speed 270 at 450 rpm
Rated Continuous Plunger Load 10,300 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 150 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Forged, Heat
Treated and
Nitrided Alloy Steel
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 60,000+hr
Liquid End
Plunger Size Range, Diameter 1-1/2" Thru 2-1/4"
Maximum Continuous Working Pressure 3,600 psi
Hydrostatic Test:
Discharge
Suction
5,400 psi
425 psi
Discharge Connection Size 2" NPTF
Suction Connection Size 4" NPTF
Maximum Working Pressure Suction Manifold 275 psi
MA-240M-HD ENGINEERING DATA
Liquid End (Continued)
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze B148-C955
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Carbon Steel
B148-C955
1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 2.35 sq. in.
Average Liquid Velocity, 2-1/4" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.19 fps
16.7 fps
General
Overall Dimensions:
Length
Width
Height
50-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End 3,580 lbs.

7
MA-240K ENGINEERING DATA
Power End
Model Quintuplex Pump MA-240K
Maximum Input HP at Speed 260 at 450 rpm
Rated Continuous Plunger Load 9,688 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 300 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Ductile Iron
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 100,000+hr
Liquid End
Plunger Size Range, Diameter 3-5/8" Thru 4-1/2"
Maximum Continuous Working Pressure 939 psi
Hydrostatic Test:
Discharge
Suction
1,400 psi
425 psi
Discharge Connection Size 4" ANSI 600FF
Suction Connection Size 8" ANSI 150FF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze
Stainless Steel
B148-C955
Various Grades
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 316 S.S.
MA-240K ENGINEERING DATA
Liquid End (Continued)
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Stainless Steel, Hardened
B148-C955
316 S.S.
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 6.54 sq. in.
Average Liquid Velocity, 4-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.2 fps
18.4 fps
General
Overall Dimensions:
Length
Width
Height
55-3/8"
56-3/4"
26"
Approximate Weights:
With Aluminum Bronze Liquid End
With Stainless Steel Liquid End
3,640 lbs.
3,900 lbs.

8 9
SC-300L ENGINEERING DATA
Power End
Model Quintuplex Pump SC-300L
Maximum Input HP at Speed 400 at 400 rpm
Rated Continuous Plunger Load 16,780 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 400 rpm
Normal Continuous Speed Range 150 to 380 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Nitrided
Forged Steel
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 400 rpm
At 150 rpm
267 fpm
100 fpm
Liquid End
Plunger Size Range, Diameter 3-5/8" Thru 4-1/2"
Maximum Continuous Working Pressure 1,626 psi
Hydrostatic Test:
Discharge
Suction
2,500 psi
425 psi
Discharge Connection Size 4" ANSI 900
Suction Connection Size 8" ANSI 150
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM Steel A516 Grade 70
Piston Type Rubber
Liners Hardened Steel
SC-300L ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Carbon Steel 1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Abrasion Resistant 17-4PH S.S.
Valve Spring Material Inconel®
Average Liquid Velocity, 4-1/4" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
3.7 fps
16.3 fps
General
Overall Dimensions:
Length
Width
Height
55-3/8"
56-3/4"
22"
Approximate Weights:
With Forged Steel Liquid End 3,900 lbs.

9
SC-300 ENGINEERING DATA
Power End
Model Quintuplex Pump SC-300
Maximum Input HP at Speed 400 at 450 rpm
Rated Intermittent Plunger Load 14,908 lbs.
Stroke 4-1/4"
Maximum Rated Intermittent Speed 450 rpm
Normal Intermittent Speed Range 150 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Nitrided
Forged Steel
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings, Precision Automotive Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
316 S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 75,000+hr
Liquid End
Plunger Size Range, Diameter 1-1/2" Thru 2-1/4"
Maximum Continuous Working Pressure 3,365 psi
Hydrostatic Test:
Discharge
Suction
5,050 psi
425 psi
Discharge Connection Size 2" NPTF
Suction Connection Size 4" NPTF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Carbon Steel A516 Grade 70
SC-300 ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 416 or 316 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Carbon Steel
B148-C955
1020
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 2.35 sq. in.
Average Liquid Velocity, 3-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.42 fps
18.1 fps
General
Overall Dimensions:
Length
Width
Height
50-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End 3,580 lbs.

10 11
RO-358L ENGINEERING DATA
Power End
Model Quintuplex Pump RO-358L
Maximum Input HP at Speed 260 at 450 rpm
Rated Continuous Plunger Load 9,688 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 300 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U.at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Ductile Iron
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 100,000+hr
Liquid End
Plunger Size Range, Diameter 3-5/8" Thru 4-1/2"
Maximum Continuous Working Pressure 939 psi
Hydrostatic Test:
Discharge
Suction
1,400 psi
425 psi
Discharge Connection Size 4" ANSI 600FF
Suction Connection Size 8" ANSI 150FF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze
Stainless Steel
B148-C955
Various Grades
RO-358L ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 316 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze
Stainless Steel, Hardened
B148-C955
316 S.S.
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 6.54 sq. in.
Average Liquid Velocity, 4-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.2 fps
18.4 fps
General
Overall Dimensions:
Length
Width
Height
55-3/8"
56-3/4"
26"
Approximate Weights:
With Aluminum Bronze Liquid End
With Stainless Steel Liquid End
3,640 lbs.
3,900 lbs.

11
RO-358 ENGINEERING DATA
Power End
Model Quintuplex Pump RO-358
Maximum Input HP at Speed 260 at 450 rpm
Rated Continuous Plunger Load 9,688 lbs.
Stroke 4-1/4"
Maximum Rated Continuous Speed 450 rpm
Normal Continuous Speed Range 300 to 420 rpm
Minimum Speed 100 rpm
Oil Capacity 54 U.S. Quarts
Viscosity, S.S.U. at 210ºF 70 to 84
Power End
Oiling System
Pressure
Lubrication System
Power Frame, One Piece Cast Iron
Crosshead, Full Cylindrical Cast Iron
Crosshead, Diameter x Length 5-3/4" x 6-3/16"
Crankshaft Ductile Iron
Crankshaft Diameters:
At Drive Extension
At Tapered Roller Bearings
At Center Bearings
At Crankpin Bearings, Diameter x Length
3.875/3.874"
4"
9-3/8"
4" x 3"
Crosshead (Wrist) Pin, Case-Hardened and Ground AISI 8620
Wrist Pin Bushing, SAE 660, Diameter x Width 2" x 3"
Main Bearings, Tapered Roller Timken®
Crankpin Bearings,
Precision Automotive
Steel Backed,
Babbitt-Lined
Extension (Pony) Rod:
Diameter
Material
2"
17-4PH S.S.
Connecting Rod, Automotive Type Ductile Iron
Average Crosshead Speed:
At 450 rpm
At 150 rpm
300 fpm
100 fpm
Minimum Life Expectancy, Main Bearings, L10 100,000+hr
Liquid End
Plunger Size Range, Diameter 3-3/8" Thru 3-1/2"
Maximum Continuous Working Pressure 2,190 psi
Hydrostatic Test:
Discharge
Suction
3,285 psi
425 psi
Discharge Connection Size 3" NPTF
Suction Connection Size 6" NPTF
Maximum Working Pressure Suction Manifold 275 psi
Available Liquid End Materials, ASTM:
Nickel Aluminum Bronze
Stainless Steel
B148-C955
2205 Duplex S.S.
RO-358 ENGINEERING DATA
Liquid End (Continued)
Plunger Type Rokide®Stainless Steel:
Chromium Oxide-Coated 410 S.S.
Stuffing Boxes, Field-Removable and Replaceable:
Aluminum Bronze B148-C955
Packing Types Available:
Gland-loaded, Nonadjustable
Spring-loaded, Cup-Type
Spring-loaded, Braided Teflon®& Kevlar®
Spring-loaded, Garlock
Style 838
Style 120X
Style 140/141
Style 8921K
Seals, Stuffing Boxes, Valve Covers, Cylinder Heads Buna-N
Studs, Material,
ASTM
A193 Grade B7,
Cadmium Plated
Available Valve Types:
Optional, Hardened and Lapped 17-4PH S.S.
Valve Spring Material Inconel®
Valve Seat, Liquid Passage Areas 6.26 sq. in.
Average Liquid Velocity, 3-1/2" Plungers at 450 rpm:
Suction Manifold
Discharge Manifold
4.42 fps
18.1 fps
General
Overall Dimensions:
Length
Width
Height
52-1/2"
56-3/4"
22-1/8"
Approximate Weights:
With Aluminum Bronze Liquid End
With Stainless Steel Liquid End
3,240 lbs.
3,600 lbs.

12 13
CROSS-SECTION
Ref. No. MA-240L MA-240L-HD MA-240M MA-240M-HD MA-240K SC-300L SC-300 RO-358L RO-358
A1 8-7/8 8-7/8 8-7/8 8-7/8 8-7/8 8-7/8 8-7/8 8-7/8 8-7/8
A2 27-9/16 27-9/16 27-9/16 27-9/16 27-9/16 27-9/16 27-5/8 27-9/16 27-9/16
A3 56-3/4 56-3/4 56-3/4 56-3/4 56-3/4 56-3/4 56-3/4 56-3/4 56-3/4
A4 29-3/16 29-3/16 29-3/16 29-3/16 29-3/16 29-3/16 29-3/16 29-3/16 29-3/16
B1 52-5/16 52-5/16 51-3/4 51-3/4 – – – 55-3/8 52-5/16
B2 38-1/4 38-1/4 37-1/2 37-1/2 – – – 39-1/4 38-1/4
B3 22-1/8 22-1/8 22-1/8 22-1/8 22 – – 22-1/8 22-1/8
B4 10 10 10 10 10 – – 10 10
B5 10-3/8 10-3/8 8-7/8 8-7/8 13-1/2 – – 13-1/2 10-3/8
B6 5-1/2 5-1/2 6-3/8 6-3/8 3-1/8 – – 3-1/8 5-1/2
(B) Discharge
Connections
3" ANSI
900 FF
3" ANSI
900 FF
2" ANSI
1500 FF
2" ANSI
1500 FF
4" ANSI
600 RJT – – 4" ANSI 600 FF
3" ANSI
900 FF
(B) Suction
Connections
6" ANSI
150 FF
6" ANSI
150 FF
4" ANSI
150 FF
4" ANSI
150 FF
8" ANSI
150 FF – – 8" ANSI 150 FF
6" ANSI
150 FF
C1 – – 51-1/16 51-1/16 – 56-3/8 52 – –
C2 37-3/4 – 38-1/4 38-1/4 – 39-1/4 38 – –
C3 22-1/8 – 22-1/8 22-1/8 – 25-1/8 21-1/4 – –
C4 10 – 10 10 – 10 10 – –
C5 10-1/2 – 9-1/4 9-1/4 – 20 11 – –
C6 4-7/8 – 4-5/8 4-5/8 – – – – –
(C) Discharge
Connections
3" ANSI
600 –2" ANSI 1500 RF
2" ANSI
1500 RF –4" ANSI 900# RF
3" ANSI
1500 RF – –
(C) Suction
Connections
SPECIAL
6" SUCT. –4" ANSI 150 RF
4" ANSI
150 RF –8" ANSI 150# RF
6" ANSI
150 RF – –
D1 – 50-3/8 – – – – 51-1/4 – 50-3/8
D2 – 37-3/4 – – – – 38 – 37-3/4
D3 – 22-1/8 – – 25 – 21-1/4 – 22-1/8
D4 – 10 – – 10 – 10 – 10
D5 – 10-1/2 – – 14-5/8 – 11 – 10-1/2
D6 – 4-7/8 – – 2-7/8 – – – 4-7/8
(D) Discharge
Connections –3" ANSI 600 – – 4" ANSI 600 FF – 3" NPT – 3" ANSI 600
(D) Suction
Connections –SPECIAL 6" SUCT. – – SPECIAL 8" SUCT. – 6" NPT – SPECIAL 6" SUCT.
DIMENSIONAL DATA TABLE

13
SUCTION CONNECTION
CRADLE DRAIN
B3
B4
B1
B2
B6
B5
DISCHARGE CONNECTIONS
FOUNDATION PLAN
2-1/2
1-1/2 2-1/8
TYP. 5
5
5
PUMP
CRANKSHAFT
30
15
35
5
A4
A3
A2
OIL PRESSURE GAUGE
LUBE OIL FILTER
OIL PRESSURE
SET VALVE
A1
REQ’D TO REMOVE OIL FILTER
C3
C1
C2
C4
C5
C6
SUCTION CONNECTION
DISCHARGE CONNECTION
CRADLE DRAIN
NOTE REQUIRED
DIRECTION OF ROTATION
PUMP
PUMP
D2
D1
NOTE REQUIRED DIRECTION
OF ROTATION
D4
D3
CRADLE DRAIN
SUCTION CONNECTION
D6
D5
DISCHARGE CONNECTION
4
DIMENSIONAL DRAWINGS
Cast Fluid End
Block Fluid End
Block Fluid End

14 15
INSTALLATION, OPERATION,
LUBRICATION, MAINTENANCE AND
STORAGE INSTRUCTIONS
SAFETY
Electrical power or engine must be shut off completely
before attempting service on the pump or its drive. Air
surrounding the unit to be free of toxic, flammable, or
explosive gases.
A properly sized and set relief valve installed in the
pump discharge system (ahead of any block valves) is
necessary to protect personnel and to avoid dangerous
overpressure. The relief valve set pressure should
be not more than 25% above the design operating
pressure and should discharge to tank or to the
atmosphere (toward the ground), and must not be
directed back to the pump suction system.
WARNING: Improper use of this equipment could result
in loss of life.
CALIFORNIA PROPOSITION 65 WARNING:
WARNING: This product and related accessories
contain chemicals known to the State of California to
cause cancer, birth defects or other reproductive harm.
STORAGE
Pumps are shipped dry from the factory. If a pump has
been in storage in a humid environment for more than
6 months the crankcase cover should be removed and
carefully examined for rust or water collected in the
power end. Flush out any evidence of rust or damage
that exists, using a light clean oil.
Pumps to be placed in extended storage should be
cleaned, repaired as needed, and completely filled to
the top with clean oil to prevent rusting. Rotate pump
monthly 4-1/2 resolutions. Plug all openings to prevent
air entry and oil leakage.
Fluid ends must be completely drained of water and
suction and discharge ports blanked off. Store pump in
a clean, dry location.
PUMP LOCATION AND PIPING DESIGN
Locate pump and driver in a clean, well drained,
ventilated, and brightly illuminated area, with adequate
working spaces around the pump to provide ample
access to fluid end, power end, and associated drive
elements.
The supply tank(s) should be large to allow dissolved
air and other gases to escape from the liquid and allow
suspended solids to settle out before entering pump.
A system employing dams and settling chambers
is desirable.
CAUTION: All pumps should be installed level. For
mobile applications the maximum angle of intermittent
operation pumps (SC pumps) should be no more than
5 degrees in any one direction.
Pumps are not designed to withstand piping weight,
vibration, and the effects of thermal piping expansion/
contraction. Piping loads may be considerable and the
weight of all valving, dampeners, filters, and associated
forces, moments, and couples must be completely
isolated. Use flexible hoses and rigid piping supports to
isolate the pump and its driver from these effects.
SUCTION PIPING
No part of the piping system deserves more careful
planning than the suction piping system. Suction
piping must be short, direct and oversize. Use one pipe
size larger than the pump suction connection. 1 to 3
feet per second suction velocity is acceptable.
Reference the following table to size a direct suction
line from a tank to a pump.
Suction Piping
4" – 6" 6" – 8" 8" – 10"
MA-240M MA-240L MA-240K
MA-240M-HD MA-240L-HD SC-300L
SC-300 RO-358L
Use no elbows, tees, or restricted port valves in
this line. Do not install orifice plates or positive
displacement type fluid meters in the suction line
which act as flow restrictors. Avoid the use of suction
filters. Consider filtering the liquid as it enters the
supply tank rather than as it leaves it. The use of an
eccentric reducer with the flat side up located at the
pump suction connection is recommended. The suction
line should slightly rise from tank to pump and loops in
which air may collect must be avoided.
The absolute pressure in a suction line may be less
than atmospheric pressure and air may be sucked into
the line unless all flanges and connections are airtight
and watertight. If you can see water leaking out of a
suction line when the pump is still, that may mean air
is being sucked in when the pump is running.
Suction piping should be buried beneath the frost
line, or insulated to avoid freezing in the winter. If the
suction line has a block valve at the supply tank, a
suitable relief valve is suggested to relieve the suction
piping from any possible dangerous overpressure from
the discharge piping system.

15
Suction piping is often large, heavy (especially when
filled with liquid), and tends to vibrate. Proper solid
supports are recommended. A suction hose located
near the pump will isolate these effects, protecting
the pump from the forces and moments that piping
weight creates.
New suction piping systems should be flushed free
of pipe scale, welding slag, and dirt before starting
the pump. Hydrostatic testing to detect air leaks is
advisable. Proper choice of suction hose construction is
essential to avoid collapse of the hose liner.
Install a dry type compound gauge in the suction
line near the pumps which should fluctuate evenly. If
violently pulsating, this gauge indicates that the
pump is not fully primed, or that one or more valves
are inoperative.
ACCELERATION HEAD
A characteristic of all reciprocating pumps is the
imperative need to consider the effects of acceleration
head. Acceleration head may be considered to be the
loss of available hydraulic head (energy) in the piping
system occurring because the demand by the pump
cylinders for liquid is not smooth and even. Because
the pump’s demand for liquid is cyclical, the velocity
of the liquid in the entire suction system is not truly
constant but varies in response to the combined
demand of the reciprocating plungers. The loss of
available hydraulic head is proportional to the speed
(RPM) of the crankshaft, the average liquid velocity
in the piping, the length of the suction piping, the
number of pumping chambers and the compressibility
of the liquid.
For a given pump, acceleration head effects may be
reduced by the use of the shortest possible suction line
sized to reduce liquid velocity to a very low speed.
Each pump should be fed by its own separate
individual piping system, free from the effects of
other pump cyclical demands for liquid.
DISCHARGE PIPING
A properly designed discharge piping system usually
prevents the need for a pulsation dampener. A good
discharge piping system includes a properly sized,
correctly set relief valve, a full opening discharge
gate or ball valve and a pressure gauge with gauge
dampener or snubber.
Locate the relief valve and pressure gauge ahead of any
block valve so that the pressure in the pump is always
reflected at the relief valve. The relieving capacity
of the relief valve must exceed the capacity of the
pump to avoid excessive pressure while relieving. Use
a full size relief line. To minimize vibration (whether
hydraulic or mechanical), discharge lines should be
kept short, direct, well supported and solidly anchored.
BYPASS PIPING
A reciprocating pump, especially after maintenance
of the valves or plungers, starts with one or more fluid
chambers full of air. Pumps operating on propane,
butane, or other volatile liquids start with vapor in the
fluid chamber(s).
Positive displacement pumps do not automatically
purge themselves of air and gas after shutdown.
For example, a quintuplex plunger pump will, after
servicing, expel the air in four of the five pump
chambers. Thus, the pressure from four of the “active”
cylinders will keep shut the discharge valve of the
“inactive”, or “air bound,” cylinder. Then, the air or
gas in this cylinder will be compressed and expanded
by its reciprocating plunger and never leave the
chamber. Similar effects occur in duplex and
triplex pumps.
To overcome these difficulties, adequate provision for
expelling the gas in the “air bound” cylinders must
be present. Common practice is to totally relieve the
pump of all discharge pressure during the start-up,
after servicing.
Consider the operational advantage of a full-sized
bypass line (return to tank) which substantially removes
discharge pressure from all cylinders during the start.
This requires a block valve on the discharge side and a
full opening bypass valve on the other side.
The bypass (to tank) can be combined with the relief
valve discharge line. This line must be full-sized, well
supported, and sloped downward to avoid freezing in
cold weather.
The ability of a reciprocating pump to be self-priming
depends on the ratio of the swept (displaced) volume in
the cylinder to the unswept (clearance) volume at the
end of the stroke. This depends on the design of the
fluid end and on the plunger size selected.
Choice of the largest size plunger for a particular fluid
end improves this compression ratio and so leads to
self priming, or easy priming. Choice of the minimum
size plunger sometimes leads to difficulties, especially
with pumps that require frequent servicing, or which
handle volatile liquids, or which contain substantial
amounts of dissolved air or gas.
An automatic bypass and purging system for these
applications may be merited.

16 17
LUBRICATION
Myers Aplex Series pumps utilize S.A.E. 40 wt.
nondetergent oil in the crankcase. This oil requires
only a nonfoaming additive and should possess good
water separation (antiemulsion) characteristics. Such
oils are often labeled “industrial” or “turbine” quality
lubricants.
In temperate climates, oil viscosity selected should
fall between 70 and 84 seconds Saybolt viscosimeter
at 210º F. In arctic service, low pour point oils
are needed.
After the first 500 hours of operation in a new pump,
drain the oil. Refill with clean, fresh oil. Change
the oil every 1,500 hours or sooner if it becomes
contaminated with water or dirt. Fill to the center of
the sight gage. Recheck after starting, adding oil to
center of gauge while running.
V-BELT DRIVE
A properly designed, well-aligned V-belt will provide
years of reliable, economical service if properly
tensioned and kept dry, free of oil and ventilated.
Alignment is critical for long life. If the shaft axes
are not truly parallel, or if the sheave grooves are not
positioned in good alignment, some belts will carry
most of the load, resulting in their disproportionate
load share and may actually twist or turn over in the
groove. Use a straight edge across the rim of the
sheaves to detect and correct for misalignment.
After about one week of operation, new V-belts will
have stretched somewhat. The motor must be moved
on its slide base to re-establish proper belt tensioning.
Insufficient tension results in slippage, burning,
squealing (especially during starting) and shortened
belt life. Overtightening imposes excessive loads on
pump and motor bearings and can cause early shaft
fatigue failure.
Use the following table in adjusting V-belt tension:
Belt
Cross-Section
Tension at Mid-Span
New Belts Used Belts
“B” 5 – 6 lb. 3-1/4 – 5 lb.
“C” 9-3/4 – 13 lb. 6-1/2 – 9-3/4 lb.
“3V” 4 – 10 lb. 3 – 7-1/2 lb.
“5V” 17 – 30 lb. 13 – 23 lb.
Applying the above forces with a small spring scale,
adjust motor position to provide the following deflection
at mid-span:
Approx. Center Distance
(Span), inches
Deflection,
inches
16 1/4
22 3/8
28 7/16
32 1/2
40 5/8
48 3/4
60 15/16
Belts must be matched in pitch length. If one or
two belts are slack, when the others are correctly
tensioned, investigate for possible reasons. Correct
any misalignment or lack of matching so each belt will
transmit its load share.
Sheaves must be balanced to prevent abnormal
vibration. Balancing weights must not be removed.
Type “QD” sheaves must be evenly tightened on their
tapered hubs to avoid rim wobble and severe lateral
vibration. V-belts which snap and jerk will produce
abnormal vibration and loads on both pump and motor
or engine.
Run the pump several minutes at full load with belt
guard removed, observing for uneven motion on the
belt slack side, especially.
When an old V-belt drive becomes unserviceable,
replace all belts, not just the broken or cracked belts.
Do not operate belts on sheaves having worn, rusted,
greasy or broken grooves. Shut off power to driver
before servicing drive or pump.
WARNING: Do not operate without appropiate guards
in place.
DIRECTION OF ROTATION
Before placing pump in operation, check that
crankshaft rotation agrees with the arrows cast on top
of the power frame by briefly jogging the electric motor.
Crankshaft rotation must be clockwise as viewed from
the right side of pump.
If pump is gear driven, remember that the pinion
shaft turns opposite the crankshaft, if using a single-
reduction geared drive or in the same direction as the
crankshaft when using a planetary gear.
AUTOMATIC (SAFETY) SHUTDOWNS
Carefully check all electric shutdown devices present,
such as crankcase oil level, discharge pressure,
vibration, lubricator oil level, motor thermostat, etc.

17
NOTES 1) CENTERLINE OF PUMP SUCTION (INLET) TO BE SLIGHTLY HIGHER THAN CENTERLINE OF SUCTION (INLET) VALVE, SO ANY AIR IN SUCTION SYSTEM PROMPTLY REACHES THE PUMP AND IS EXPELLED. 2) SLOPE BYPASS SO LOW POINT DRAIN WILL FULLY
EMPTY RELIEF AND CHOKE VALVES AND ALL
LIQUID IN BYPASS CIRCUIT.
3) DO NOT LOCATE PIPING OR OTHER EQUIPMENT IN FRONT OF OR ABOVE PUMP LIQUID END, PREVENTING SERVICING. 4) LOCATE CHARGING PUMP AT POINT SHOWN IF A
CHARGING PUMP IS NECESSARY (AS FOR VOLATILE FLUIDS, FOR EXAMPLE).
5) IF DESIRED, A TWO-WAY MOTOR-OPERATED BYPASS
VALVE MAY BE USED RATHER THAN A MANUAL TYPE. IT SHOULD BE DESIGNED TO OPEN AUTOMATICALLY WHILE STARTING OR STOPPING.
6) FEED LINE AND BYPASS LINE SHOULD FEED
LIQUID INTO TANK BELOW MINIMUM LIQUID LEVEL.
LIQUID SUPPLY TANK
SUGGESTED PIPING SYSTEM FOR PLUNGER PUMPS
BYPASS LINE
FULL-OPENING SUCTION (INLET) LINE VALVE
LOW POINT DRAIN VALVE (SEE NOTE 2)
FLEXIBLE HOSE OR EXPANSION JOINT (SEE NOTE 7)
NEEDLE OR HARD-TRIMMED CHOKE BYPASS VALVE OPEN TO
EXPEL AIR IN PUMP PRIOR TO LOADING (SEE NOTE 5)
FULL-OPENING RELIEF VALVE OR BURST-DISC
VALVE OPENS FULLY WHEN SET PRESSURE IS REACHED
HORIZONTAL PLUNGER PUMP WITH DUAL SUCTION AND DUAL DISCHARGE CONNECTIONS (DRIVER AND FOUNDATIONS NOT SHOWN)
PRESSURE GAUGE AND BLOCK VALVE
DISCHARGE PULSATION DAMPENER (IF USED)
SUCTION PULSATION DAMPENER (IF USED)
DISCHARGE LINE (SEE NOTE 7)
FULL-OPENING DISCHARGE LINE VALVE
SWING CHECK VALVE WITH FULL-OPENING SEAT
PRESSURE RELIEF VALVE AND COLD WEATHER DRAIN (SEE NOTE 9)
CENTERLINE OF PUMP SUCTION (INLET) (SEE NOTE 1)
ECCENTRIC REDUCER WITH FLAT SIDE UP
PRESSURE GAUGE AND BLOCK VALVE
FLEXIBLE HOSE OR EXPANSION JOINT (SEE NOTE 7)
SUCTION (INLET) LINE. SEPARATE LINE REQUIRED FOR EACH PUMP IF MULTIPLE PUMPING UNITS ARE USED. SIZE OF LINE DEPENDS ON ACCELERATION HEAD FACTOR BUT MUST AT LEAST EQUAL PUMP SUCTION CONNECTION SIZE. (MINIMUM)
SEE NOTE 4
VORTEX SPLITTER AND SUPPORT
SUCTION BELL. DESIGNED FOR LOW LIQUID ENTRY VELOCITY (MAY INCLUDE FOOT VALVE IF DESIRABLE)
COMPLETELY SUBMERGED BAFFLE PLATE SEPARATING INCOMING FROM OUTGOING LIQUID
MANHOLE
MINIMUM LIQUID LEVEL
FEED LINE (SEE NOTE 6)
7) TO REMOVE PIPING STRAIN AND VIBRATION, A
FLEXIBLE HOSE, EXPANSION JOINT, OR SWIVEL JOINT PAIR SHOULD BE POSITIONED TO MINIMIZE EFFECTS OF PIPING THERMAL
EXPANSION, CONTRACTION AND PIPING WEIGHT. 8) SUCTION AND DISCHARGE PIPING MUST BE SUPPORTED AND ANCHORED. 9) TO PROTECT SUCTION SYSTEM AGAINST
HAZARD OF DISCHARGE PRESSURE ENTRY (AS WHEN PUMP IS IDLE) A SMALL RELIEF VALVE IS OFTEN CONNECTED HERE. 10) ALL SYSTEM CONPONENTS MUST HAVE ADEQUATE PRESSURE RATINGS FOR OPERATING, STARTING, AND UPSET CONDITIONS IN ORDER TO REDUCE POTENTIAL HAZARDS, PARTICULAR ATTENTION IS RECOMMENDED FOR THE SURGE CONDITION THAT WILL RESULT DOWNSTREAM OF THE RELIEF
VALVE WHEN NORMAL DISCHARGE IS BLOCKED.

18 19
CRANKSHAFT ASSEMBLY
GENERAL
Myers Aplex Series crankshaft suspension uses two
single-row tapered bearings, which are shim adjusted
to provide the correct running clearance.
Thorough cleaning of all components prior to assembly
is essential.
Power frame, shaft, bearings and retainer must be
scrupulously scrubbed with clean solvent before
starting. Remove any oil, dirt, rust and foreign matter
which might prevent the correct fit up.
Crankshaft journals are critical. Remove all burrs, rust
spots, and nicks, paying special attention to the ground
areas on which bearings and oil seals operate.
Connecting rods and crossheads may be installed
either before or after installing the crankshaft in
MA-240M pumps.
TAPERED ROLLER BEARINGS
Shaft and frame tolerances provide a tight fit on the
shaft and in the carrier. The best way to install the
cone assembly (consists of the inner race, cage and
rollers) on the shaft is to heat the cone assembly
in an electric oven for 30 minutes at 300 to 400ºF.
(do not heat bearings with an acetylene torch as this
will ruin the bearings!) Using clean, insulated gloves,
remove the hot cone assembly from the oven, promptly
dropping it on to the shaft.
The cone assembly must contact the seat thrust face
and the large end of the rollers must be down. Do not
hammer on the bearing. The soft steel cage is easily
distorted, ruining its function as a roller separator and
guide against skewing. If the cone does not contact
its thrust face properly, it must be pressed into place
using a specially machined sleeve (which does not
touch the soft steel cage). A hydraulic press is
recommended if this difficulty arises.
CUP INSTALLATION
Tapered roller bearing cup (outer races) is a press-fit in
the bearing carrier, using a hydraulic press. Cup must
be pressed into a clean carrier until the race solidly
abuts its shoulder.
The tool or plate used for this must contact only the
outer end face – not on the taper.
CENTER BEARINGS
The two center bearings are pressed into the power
frame bore, one from the right and one from the left.
The drilled indentation on the bearing must be aligned
with drilled and tapped hole in the back of the power
frame. After the bearing is pressed into place, this
indentation must approximately line up to allow use of
the locking set screw. Press into place until the flange
on the bearing faces out on the counter bore in the
power frame. This ensures the bearing is not cocked.
After the bearings are in place, lock them with the set
screw.
INSTALLING CRANKSHAFT
SHIM ADJUSTMENT OF TAPERED ROLLER
BEARINGS
To provide for crankshaft thermal expansion, sufficient
shims must be installed to provide .005" to .015"
lateral end play, when shaft is cold. Shims must be
placed only under the drive side bearing carrier. The
lube oil housing has a gasket under it.
A feeler gauge and a 1" micrometer caliper are
required. Install a trail shim set on one side of the
pump. Tighten the flange bolts on this side only.
CAUTION: Lubricate the frame bores and the O-ring
seals located in each carrier to prevent damage during
entry. Oil the bearings.
Draw up the carrier, evenly tightening its cap screws.
Rotate the crankshaft slowly by hand, seating all rollers
into running position.
Measure the gap existing between the frame face and
carrier flange. The correct thickness of the shim set to
be installed equals the measure gap plus about .010".
After installing above shim set, a dial indicator may be
used against the end of the shaft to confirm the shim
selection. Bump the shaft in one direction and zero
the dial indicator. Bump the shaft the opposite way. If
shimming is correct, the shaft will move laterally from
.005" to .010".
The recommended tightening torque for bearing
retainer 5/8"-11UNC cap screws is 118 to 145 ft. lb.
INSTALLATION OF CRANKSHAFT OIL SEAL
Insert oil seal over the end of crankshaft and position
it into the oil seal bore in the bearing carrier. Using a
rubber mallet, tap it into the bore until the face of the
seal is flush with the bearing carrier.

19
LUBE OIL PUMP ASSEMBLY
Lube oil pump and filter assemblies are employed in
certain Myers Aplex Series pumps. This assembly is
installed after the shaft and its tapered bearings have
been correctly set. Providing filtered oil under pressure
(35 to 75 psi) to all crosshead pin bushings and
crankpin bearings, this special gear pump is driven by
a bloted-on drive shaft. Driver is made with a female
drive square which drives the male square end of the
lube oil pump shaft.
The driver shaft is piloted by the main bearing inner
race cone and is secured to the crankshaft by four
socket head cap screws. Stake their heads using a
center punch to upset the adjoining metal.
The lube oil pump (Tuthill) is a gear type pump
possessing a self-reversing sector which automatically
switches suction and discharge connections in the
event that the pump is caused to rotate opposite
the correct direction. The lube oil pump is readily
removed for inspection, repair, or replacement without
disturbing any other pump component.
The lube oil pump shaft is journaled in a bronze
bushing fitted into the bearing carrier. If this bushing
becomes worn, it must be promptly replaced. A worn
bronze bushing will cause this pump to frequently lose
its prime, and also may cause excessive wear in the
pump rotor teeth.
DISASSEMBLY
After removing the connecting rod cap and cap bolts
(note identifying marks on each cap so each may be
later correctly reassembled onto its own rod) remove
a bearing carrier from the frame. Two jack out tapped
holes are provided in the flange of the carrier for this
purpose. Support the shaft during removal to
avoid damage.
The crankshaft may now be extracted, once all
connecting rods are moved clear. Examine the crankpin
surfaces for wear or corrosive pitting. The correct
diameters of these journals are:
Crankpin Diameter............................4.0000/3.9990"
If worn more than .010" undersize, crankshaft should
be replaced, or an attempt to salvage it may be made
at a shop well equipped to grind the crankpins which
must be fully round, chrome plated, and finish ground
to the above sizes.
Crankshaft tapered roller bearings should be carefully
examined for pitting, scoring or corrosion, and replaced
as required. The cone and roller assembly is most
easily removed by first cutting away the cage. Then
heat the cone (inner race) with the shaft held vertically
so cone will drop off due to its own weight. Avoid
excessive heat on the crankshaft which tends to distort
its geometry.
Cups (outer races) of tapered roller bearings may be
extracted from bearing carrier using a conventional
bearing puller tool of the automotive type (widely
available). Do not attempt to use heat on a bearing
carrier as this will result in severe distortion (out-of-
round). Replace the bearing carrier if broken or
out-of-round.
CONNECTING ROD, CROSSHEAD,
EXTENSION ROD, CROSSHEAD PIN
AND WIPER BOX ASSEMBLY/
DISASSEMBLY:
GENERAL
Myers Aplex Series connecting rod assemblies employ
precision automotive type steel backed, babbitt-lined
crankpin bearing halves which require
no shims for clearance adjustment. This pump
employs full circle (piston type) crossheads and
hardened stainless steel extension rods, which are
field replaceable.
Extension rods are provided with wrenching flats
to permit tightening of the tapered thread into the
crosshead, establishing accurate alignment while
affording easy field installation.
Before beginning the assembly all parts must be
scrupulously cleaned, removing all oil, dirt, rust, and
foreign matter which prevent proper fitting, or which
might tend to score the rubbing surfaces. Clean
and examine the power frame bores for scoring and
abnormal wear, especially wear of the lower crosshead
guide way. Hone smooth, if rough.
Measure the bores of the frame using inside
micrometers to determine abnormal frame wear if any.
Crosshead O.D.: 5.742/5.740
New Frame Bores: 5.749/5.742
Frame bores that have become worn more than .015"
must be sleeved with a cast iron liner to re-establish
correct geometry and alignment. Contact Myers Aplex
Series concerning the repair of badly worn frame bores.
Smooth any rough corners and edges on the crosshead
skirts, using fine emery cloth. Examine and clean the
female tapered threads and wrist pin holes.

20 21
INSTALLING WRIST PIN BUSHINGS
The wrist pin bushing is precision machined
bearing bronze which is press fitted into the eye of
the connecting rod.
Bushing O.D.: 2.256/2.255
Connecting Rod Eye: 2.251/2.254
MA-240L
SC-300
SC-300L
RO-358
Carefully align the bushing with its hole, and after
applying oil to bushing O.D. use a hydraulic press
to force it home. When a bronze bushing is pressed
into place, the I.D. (bore) of the bushing is reduced
somewhat, owing to the extent of press fit. Therefore,
a clean, new wrist pin should be inserted into the
bushing bore to establish that running clearance has
been obtained. The running clearance between the
wrist pin and installed bushing is:
New Pin O.D.: 2.0238/2.0233
Installed Bushing Bore: 2.0251/2.0261
Oil Clearance ........................................0013/.0028"
Replacement bushings are furnished prebored by
Myers Aplex Series which usually eliminates the need
to ream the installed bushing bore. However, due to
slight variations in finishes and tolerances it sometimes
happens that more than predicted contraction of
the I.D. occurs. This occurrence results in a slight
interference which may be eliminated by lightly honing
the bore of the bronze. (not by reducing the pin size!)
Bore of bushing must be round and free of taper.
PINNING THE CROSSHEAD
A pressfit is employed between the crosshead pin and
crosshead to secure the pin against any motion. A
hydraulic press is employed to force the pin through
the bosses of the crosshead.
A mishap during insertion can occur causing the
ruin of the pin or the crosshead, if during application
of pressure:
(a) Pin is not aligned absolutely square with
the crosshead.
(b) Crosshead is not supported on v-blocks so it can
roll while under load.
(c) Connecting rod is not fully supported so pin
cannot enter the bushing without damage to it.
This will damage the bushing.
(d) Failure to oil pin O.D. and crosshead bores, to
prevent galling. Use clean motor oil.
After installing the pin, carefully check the crosshead
O.D. to see if it is out-of-round. If so, use a rubber
mallet to restore the crosshead O.D. into its original
roundness.
ORDER OF ASSEMBLY
The connecting rod/crosshead assembly is installed
before the crankshaft is installed, because the wiper
box wall bore is smaller than the crosshead O.D.
This is most easily done by setting the power frame
vertically and dropping each crosshead assembly into
its frame bore.
PRECISION CRANKPIN (CRANKTHROW) BEARINGS
Myers Aplex Series pump crankpin bearings require
no shimming to establish correct running clearance.
Precise machining of the connecting rod, caps and
crankpin journals is necessary to achieve
this convenience.
New Crankpin O.D.: 4.000/3.999
New Connecting Rod Bore: 4.232/4.233
Crankpins that are worn out-of-round, tapered, or badly
scored should either be discarded or perhaps salvaged
by grinding undersize, hard chrome-plated, and finish
ground to above diameter.
Connecting rod/cap bore must be perfectly round and
within above sizes and free of taper. Discard if elliptical
or tapered as the result of abnormal heating. Each cap
and rod is match-marked for correct identification.
Take care that each cap is reinstalled properly with its
companion rod. Bearing halves are identical and are
prevented from rotating by tongues that fit into slots in
the cap.
Check that all oil holes are clean and fully open. All
surfaces must be perfectly clean and lightly oiled prior
to assembly. Remove any burrs or sharp corners which
prevent the perfect fitting of these precision bearings.
Using a torque wrench, tighten cap bolts as follows:
Thread Size:
5/8" – 18UNC
Tightening Torque:
125-135 Ft. Lb.
Thread Size:
1/2" – 13UNC
Tightening Torque:
60-75 Ft. Lb.
MA-240L SC-300
MA-240L-HD SC-300L
MA-240M RO-358
MA-240M-HD RO-358L
MA-240K
Specified torque, applied to clean, well oiled threads
and bearing faces, will create tensile stresses in
the cap bolts from 90,000 to 110,000 psi, approx.
and will provide correct initial tension. Myers Aplex
Series pumps use high strength cap bolts suitable