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Maro MA Series - User Manual

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1
MARO OPERATING MANUAL
INCLUDING: OPERATION, INSTALLATION & MAINTENANCE
RELEASED: 1.4.2021
3” MARO MA Series Metallic DIAPHRAGM PUMP
READ THIS MANUAL CAREFULLY BEFORE INSTALLING, OPERATING OR SERVICING THIS EQUIPMENT. It is the responsibility of the employer to
place this information in the hands of the operator. Keep for future reference. Failure to comply with the recommendations stated in this
manual can cause serious injury, damage the pump and void factory warranty.
Compound
Optimum
Temperature
Main Applications / Chemical Compatibility
Neoprene
10 to 54 C
General purpose diaphragm
(non-aggressive applications -- water-based slurries, well water or sea
water)
50 to 130 F
Buna-N
10 to 60 C
50 to 140 F
Petroleum/oil-based fluids (leaded gasoline, fuel oils, non-synthetic
hydraulic oils, kerosene, turpentine, motor oils)
Santoprene
10 to 100 C
50 to 212 F
Low
er
cost
alternative to
PTFE
in many acidic and caustic applications
such as sodium hydroxide, sulfuric or hydrochloric, At a cost comparable
to neoprene.
PTFE
10 to 100
C
50 to 212 F
Aggressive chemicals and solvent but low abrasion resistance
PUMP DATA
Maximum Capacity: 890 l/min (236 gpm)
Air Inlet Connection: ¾” BSP (F)
Fluid Inlet/Outlet Connection: 3” BSP (F) or NPT (F)
Max. Working Pressure: 8.3 bar (120psi)
Suspended Solids Max. Dia.: 9 mm (3/8”)
Max. Dry Suction Lift: 5.8 m (19 ft)
Shipping Weight: 50 Kg (110 lbs) AL Pump
97 Kg (213 lbs) CI Pump
101 Kg (223 lbs) SS Pump

Table of Contents

Questions and Answers

  • A
    Ana ValenzuelaJul 29, 2025
    What to do if Maro Water Pump cannot start?
    • K
      Kayla DavisJul 29, 2025
      If your Maro Water Pump fails to start, several issues could be the cause. First, ensure the air is connected to the air inlet, not the exhaust. If that's correct, check for obstructions or shut-off valves in the discharge piping; clean the line or open the valve if needed. Other potential causes include a failed shaft seal (replace it), a ruptured diaphragm (replace the diaphragm), or a malfunctioning air valve system (check the carrier for movement and seals in the chest assembly, clean or replace if necessary).
  • L
    Leon RyanAug 4, 2025
    Why Maro Water Pump runs but has no discharge?
    • P
      pamela29Aug 5, 2025
      If your Maro Water Pump is running but not discharging any fluid, there might be a suction line leakage, so check and repair it. Alternatively, the valve ball may not be seating correctly or is damaged; remove any obstructions and replace the balls or seats if needed. Also, the suction strainer or line could be clogged, so clear it. Finally, excessive suction lift could be the problem; shorten the suction line. A ruptured diaphragm may also cause this issue; replace it.
  • J
    johnvalenciaAug 10, 2025
    What to do if Maro Water Pump has erratic flow?
    • V
      Virginia HarperAug 10, 2025
      If your Maro Water Pump is experiencing erratic flow, several factors could be responsible. A ruptured diaphragm on one side is a potential cause, so replace the diaphragm. Check for suction line leakage and repair it if necessary. A malfunctioning air valve system could also be the culprit; inspect the carrier for freedom of movement and all seals in the chest assembly, cleaning or replacing parts as needed. Other possible issues include a failed shaft seal (replace it) or a valve ball not seating correctly or damaged (remove any obstructions and replace the balls or seats).
  • E
    Edwin MccarthyAug 16, 2025
    Why Maro Water Pump has intermittent stroke rate?
    • J
      Jason NavarroAug 16, 2025
      An intermittent stroke rate in your Maro Water Pump can be caused by several factors. A failed shaft seal may be the issue, so replace it. Alternatively, the air valve system might be malfunctioning; check the carrier for freedom of movement and all seals in the chest assembly, and clean or replace if necessary. Over-lubrication can also cause this, so clean the air valve system and shaft bushing. Lastly, a valve ball obstruction or a ball not sealing correctly could be the problem; remove any obstructions and replace the balls or seats.
  • J
    joyjenningsAug 22, 2025
    What to do if there is fluid discharge from air in Maro Water Pump?
    • V
      vallenAug 22, 2025
      If you notice fluid discharging from the air vent of your Maro Water Pump, it could be due to a loose outer piston. Try re-torquing it to the manual exhaust specification. Another potential cause is a ruptured diaphragm, which would require replacement.

Summary

MARO MA Series Metallic Diaphragm Pump Overview

Pump Data Specifications

Provides key specifications like capacity, connections, pressure, and weight for the pump.

General Description and Safety

Operating and Safety Precautions

Crucial safety instructions, warnings, and cautions for handling and operating the pump.

Pump Identification and Installation Guidance

Identification Code

Installation Diagram

Pump Performance and Components

Pump Curve

Graphical data showing pump performance characteristics like flow rate and head.

Parts List

Fluid Section Details and Requirements

Torque Requirements

Specifies torque values for critical fasteners during assembly and maintenance.

Lubrication and Sealants

Disassembly, Reassembly, and Torque

Fluid Section Disassembly and Reassembly

Assembly Torque and Lubrication

Air Motor Service and Troubleshooting

Air Motor Section Service

Troubleshooting Guide

Identifies common pump problems and provides solutions for starting, flow, and stroke issues.

Maro MA Series Specifications

General IconGeneral
ModelMA Series
CategoryWater Pump
Maximum Suction8m
Power SourceElectric
Power0.5 HP
Voltage220V
Frequency50Hz
Maximum HeadUp to 50 m
Max HeadUp to 50 m
Inlet/Outlet1"
Power Consumption370W, 550W, 750W
MaterialCast Iron