MO Gear Pump
Azcue Pumps (Spanien, gegr. 1937 Mendaro) ist Iberian/Mediterranean Standardlieferant für Marine-Pumpen. MO-Serie ist Standard-Gear-Pump auf spanischen, italienischen und südamerikanischen Newbuildings.
Inspector Detail
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Common issues
- Gear and bushing wear increasing internal clearance and reducing volumetric efficiency
- Mechanical seal leakage from dry-running or abrasive contamination in the fuel
- Relief/bypass valve drift or sticking causing over-pressure or reduced discharge
- Coupling misalignment causing bearing or seal wear
- Cavitation from a restricted suction line or clogged strainer
- Bearing wear from prolonged operation outside the rated viscosity range
Inspection checklist
- Check pump discharge pressure/flow against commissioning baseline
- Inspect the mechanical seal area for weeping or leakage
- Check relief/bypass valve setting and function
- Inspect the suction strainer for fouling
- Check coupling alignment and condition
- Measure gear/bushing clearance if performance has dropped and the pump is opened
- Check bearing condition (noise/vibration) and lubrication
- Verify motor current draw against rated value
Service intervals
| Mechanical seal inspection | typically every 4,000-8,000 hours or condition-based |
| Strainer cleaning | per fouling rate, commonly every 250-500 hours or as indicated by differential pressure |
| Coupling alignment check | at each major maintenance or after any disturbance to pump/motor mounting |
| Internal clearance/overhaul | condition-based, typically every 15,000-25,000 hours depending on fuel cleanliness - confirm against maker's guidance |
Typical wear limits
| Gear-to-casing radial clearance | typically a few tenths of a millimetre for pumps in this flow range, but scales with pump size (MO 25 through MO 65) - confirm against the specific size's manual rather than assuming one figure |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal kit
- Gear set (driving/driven gears)
- Bushings/bearings
- Relief valve spring/seat kit
- Coupling element
Safety
- Pressurised fuel oil system - isolate and depressurise before opening the pump casing
- Fire risk from fuel leakage at seal or gasket joints - keep the area free of oil accumulation
- Rotating shaft/coupling guarding must be in place before running
Class survey
Fuel oil transfer pumps are typically part of the fuel oil system covered under machinery class rules; surveyors check for leakage, guarding, relief valve function and availability of a standby pump where a duty/standby arrangement is required.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Service & Maintenance
Standard gear pump service.
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