Mono M12-25 Grifter
Spare Parts for M12-25 Grifter
Spare Parts List
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| Select | Qty | Ref. | Part Number | Description | Material / Spec |
|---|---|---|---|---|---|
| Macerator (125 mm) — Wear & Consumable Parts | |||||
| 1 | 2 | M125 3000 | Cutter Ring (stationary cutting ring) | Carbon-chromium tool steel, hardened — grinder wear | |
| 1 | 4 | M125 3500 | Impeller (rotary cutter) | Carbon-chromium-moly steel, hardened — grinder wear | |
| 1 | 13 | W40533 | Mechanical Seal (macerator) | Carbon / ceramic, oil-lubricated | |
| 1 | 19 | M125 4501 | Shaft Seal Sleeve | – | |
| 1 | 18 | E061 4200 | Thrower | Shaft protection disc | |
| 1 | 3 | W40529 | Torl Seal Ring | – | |
| 1 | 5 | S305360P | Torl Seal Ring | – | |
| 1 | 17 | S355351P | Torl Seal Ring (shaft oil-seal position) | – | |
| 1 | 11 | M125 4000 | Seal Retaining Boss | – | |
| 1 | 9 | N845201F | Impeller Retaining Nut (left-hand thread) | – | |
| 1 | 8 | M125 4700 | Lock Washer | – | |
| Pump Element (CP25) — Wear & Consumable Parts | |||||
| 1 | 2 | M25 2200 | Stator | Nitrile rubber — primary wear item | |
| 1 | 4 | CP25 2520 | Rotor | 316 SS, hard chrome plated — wear item | |
| 1 | 6 | MPK-SK011 | Mechanical Seal Kit (includes torl seal ring) | Carbon / ceramic | |
| Pump Element (CP25) — Body, Castings & Drive | |||||
| 1 | 1 | CP11 2400 | End Cover | Acetal copolymer | |
| 1 | 5 | CP11 0100 | Pump Body | Acetal copolymer | |
| 1 | 12 | CP25 3210 | Stub Shaft | – | |
| 1 | 13 | CP25 4700 | Stator Support Ring | – | |
| 1 | 3 | CP00 0430 | Plug (fill) | – | |
| Fasteners & Hardware (Pump Element) | |||||
| 8 | 7 | K113242F | Hex Head Bolt | – | |
| 8 | 8 | N113102F | Hex Nut | – | |
| 8 | 9 | W113052F | Plain Washer | – | |
| 8 | 10 | W113252F | Spring Washer | – | |
OEM part numbers are referenced for identification purposes only. Parts listed suit the Mono Grifter M12-25 (125 mm macerator + CP25 pump element; order codes M12B125 / M12B325). Ref. = item number on the OEM exploded assembly diagram. This is a curated list of the most-ordered wear and service parts — the full parts list (macerator inlet flange & hardware, breather, revolution counter, control gear) is available on request. Send your nameplate photo and we’ll confirm the exact part.
Exploded Parts Views
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model / Build | Grifter M12-25 packaged pumping station (order codes M12B125 / M12B325) |
| Station Type | Packaged sewage pumping station – 125 mm macerator (grinder) driving a Mono CP25 progressive cavity pump, in a GRP weatherproof kiosk |
| Pump Element | Mono CP25 progressive cavity (single helical rotor / stator), positive displacement |
| Macerator | 125 mm rotary cutter / impeller running within a stationary cutting ring |
| Motor Power | 0.55 kW |
| Electrical Supply | 240V single-phase or 415V three-phase (single or duty/standby control) |
| Nominal Capacity | 0.43 L/s (≈1.5 m³/hr) |
| Maximum Head | 3 Bar (≈30 m) |
| Maximum Suction Lift | System-dependent; ≈3 m at 20 m head (refer to duty / suction-lift curve) |
| Discharge Connection | 1" BSP female (package rising main 1½" BSP union) |
| Valves / Pipework (min. bore) | 25 mm internal diameter |
| Direction of Rotation | Anticlockwise (viewed at the pump end towards the motor) |
| Macerator Materials | Cast iron body (BS 1452 gr 220/260); hardened & tempered carbon-chromium-molybdenum steel impeller; hardened carbon-chromium tool steel cutting ring |
| Pump Materials | 316 S31 stainless steel rotor (hard chrome plated); free-moulded nitrile rubber stator; impact-resistant non-contaminating acetal copolymer body & endcover |
| Mechanical Seals | Carbon / ceramic (macerator seal oil-lubricated, mounted external to process liquid; pump seal carbon / ceramic) |
| Lubrication | Macerator oil bath – Rock Oil ISO 100 (or equivalent), level half-way up the sight glass |
| Weight (Grifter unit) | 45 kg |
| Kiosk / Package | GRP kiosk 1528 × 1048 × 590 mm; sump depth 1200 mm (270 kg) or 1600 mm (350 kg) |
| Noise Level | ≤70 dB(A) |
| Suitable Duty | Normal domestic / municipal sewage. Not for surface water, flooding, or industrial waste containing glass, bone, metal, scouring pads or excessive rag |
Figures are for the Mono Grifter M12-25 (CP25 pump element). Capacity, head and suction lift are system-dependent – confirm against the duty curve for your installation. Order codes M12B125 and M12B325 share this pump element and macerator.
Troubleshooting, Common Faults & Solutions
Static or Rising Liquid Level (Station Not Clearing the Tank)
Likely Cause: Control breaker tripped; incorrect direction of rotation; restriction in the vertical suction pipe or macerator; restriction in the check valve or delivery pipeline; damaged pump element; level control restricted at low level; or a damaged mechanical seal in the macerator or pump
Action / Part: Reset breakers and confirm rotation is anticlockwise (viewed at the pump end towards the motor). Clear the suction pipe by removing plug ‘D’ and rodding, then reseal with PTFE. Inspect the macerator (cutter ring M125 3000, impeller M125 3500) and pump element (stator M25 2200 + rotor CP25 2520); replace worn seals (macerator W40533 / pump MPK-SK011)
Unit Fails to Stop at Low Level
Likely Cause: Float / level switch movement restricted, or accumulated solids on the level switch, cable or tank bottom
Action / Part: Check the float switch moves freely through its full travel; remove any accumulated solids from the switch, cable and tank bottom that could foul it or damage the macerator/pump
Incorrect Direction of Rotation (Critical)
Likely Cause: Supply phased for the wrong rotation on initial start-up or after re-wiring
Action / Part: CRITICAL: correct rotation is anticlockwise viewed at the pump end towards the motor (also arrowed on the macerator body; confirm by the thrower ‘T’ rotation through the slots). If it runs clockwise, STOP IMMEDIATELY and re-wire the supply — running in reverse damages the pump element and can unscrew the rotor. Never run the unit in ‘hand’ where a dry run could occur
Reduced Flow / Poor Maceration
Likely Cause: Worn macerator cutter ring / impeller (poor grinding, frequent blockages) or worn pump stator and rotor (runs but low output)
Action / Part: Inspect and replace the cutter ring (M125 3000) and impeller (M125 3500); replace the pump stator and rotor together as a matched set (stator M25 2200 + rotor CP25 2520). Confirm total discharge pressure is within the pump rating (max 3 Bar)
Leakage at the Mechanical Seal / Oil Leakage
Likely Cause: Worn or damaged macerator or pump mechanical seal (leakage of pump lubricant at the back of the unit indicates a damaged seal)
Action / Part: Check the macerator oil level (half-way up the sight glass; top up with Rock Oil ISO 100 or equivalent). Replace the macerator mechanical seal (W40533) or pump mechanical seal (MPK-SK011). Note: motor or bearing damage caused by a worn mechanical seal is not covered by warranty
High Level Alarm Lit
Likely Cause: Station not keeping up with inflow — any of the “static / rising level” causes above — or an abnormal ‘flash’ inflow
Action / Part: Investigate immediately. Check breakers, rotation, and for suction/delivery restriction; inspect the pump element and macerator for wear. Do not ignore the alarm — serious damage can result if warning lights are ignored
Never Run Dry / Frequent Blockages
Likely Cause: Running dry (immediate damage to the pump element) or unsuitable material in the tank (glass, bone, metal scourers, wet-strength nappies, excessive rag, surface water)
Action / Part: Never run the pump dry — ensure at least 200 mm of liquid in the tank and the delivery valve is open; fill the pump via plug ‘P’ before starting. The Grifter is for normal domestic sewage only; exclude abrasives and surface water to preserve the cutter ring (M125 3000), impeller (M125 3500) and stator (M25 2200)
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