Maxi
Grindex Maxi — Drainage - Heavy duty large capacity.
Inspector Detail
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Common issues
- Impeller wear from abrasive solids in the dewatering stream
- Mechanical seal failure from running dry or from abrasive ingress
- Cable gland leakage allowing water ingress into the motor compartment
- Strainer/inlet clogging reducing flow and causing cavitation
- Bearing wear from prolonged continuous duty or misalignment
- Impeller-to-wear-plate clearance increase reducing head and flow over time
- Overheating trip from voltage drop on long cable runs or an undersized supply
Inspection checklist
- Insulation resistance (megger) test of motor windings
- Oil chamber/seal housing inspection for water contamination in the barrier oil
- Impeller condition and clearance check
- Cable and cable gland condition for cuts or abrasion
- Strainer/inlet screen condition
- Lifting handle/chain and guard condition
- Running current draw vs rated current
- Vibration check while running
Service intervals
| Barrier/seal oil check and change | every 1000-2000 running hours or per the manufacturer's schedule |
| Insulation resistance test | every 3-6 months or before redeployment |
| Impeller and wear plate inspection | annually or per duty severity |
| Cable and gland inspection | at every deployment/retrieval |
| Bearing lubrication service | per the manufacturer's interval, typically annual on continuous duty |
Typical wear limits
| Impeller-to-wear-plate clearance | typically 0.3-0.8 mm when new; condemn at roughly double the as-new clearance for this duty class - confirm against the manufacturer's manual |
| Insulation resistance | commonly expected above 1 M ohm for continued service - follow the manufacturer's minimum accept value |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Mechanical seal set (pump-side and motor-side)
- Impeller
- Wear plate/suction cover
- Cable gland kit
- O-ring and gasket set
- Barrier/seal oil (correct grade)
Safety
- Electrical isolation before handling - submersible motor is connected to a mains supply
- Lifting equipment condition - the pump is heavy and typically lowered by crane/winch
- Confined space entry risk in the sump or pit where the pump is deployed
- Residual pressure in the discharge hose when stopping under head
Class survey
Where fitted as essential dewatering or salvage equipment, class will expect periodic function testing, insulation resistance records, and confirmation the pump remains within its certified duty envelope (head/flow/solids).
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Visual inspection of impeller surface, hard-iron coating integrity, and strainer perforations. Check for pitting in hydraulic surfaces.
Run pressure drop test across seal cavity; measure leakage rate at discharge. Inspect seal chamber for contamination ingress.
Megohm meter (insulation resistance test) across motor windings to ground at 500-1000VDC. Document baseline and trending.
Visual inspect cable jacket for cracks, UV damage, moisture ingress. Measure conductor resistance and insulation resistance annually.
Temperature monitoring of bearing housing (should not exceed 65°C). Visual inspection of oil color/clarity in accessible bearing cavities post-operation.
Type-general inspection and maintenance points for this equipment category — not model-specific.
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