Zavedení
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your KOSHIN SEH-25H 1-inch gasoline water pump. The SEH-25H is a compact and versatile self-priming centrifugal pump, powered by a reliable Honda GXH50 4-stroke engine, designed for various water transfer applications including irrigation, draining ponds, and washing agricultural equipment. Please read this manual thoroughly before operating the pump.
Bezpečnostní informace
Always prioritize safety when operating the KOSHIN SEH-25H water pump. Failure to follow these instructions can result in serious injury or damage to the equipment.
- Přečtěte si manuál: Před použitím se seznamte se všemi provozními postupy a bezpečnostními upozorněními.
- Větrání: Operate the pump in a well-ventilated area. Engine exhaust contains carbon monoxide, which is a colorless, odorless, and poisonous gas.
- Bezpečnost paliva: Gasoline is highly flammable. Refuel in a well-ventilated area with the engine off and cool. Do not smoke or allow open flames near the pump.
- Horké povrchy: The engine and muffler become very hot during operation and remain hot for a period after stopping. Avoid contact to prevent burns.
- Elektrická bezpečnost: Do not operate the pump in wet conditions or near standing water unless specifically designed for submersible use (this pump is not).
- Stabilní povrch: Place the pump on a firm, level surface to prevent tipping during operation.
- Ochrana očí: Wear appropriate eye protection when operating or maintaining the pump.
- Děti a domácí mazlíčci: Udržujte děti a domácí zvířata mimo provozní oblast.
Komponenty skončilyview
The KOSHIN SEH-25H pump consists of several key components. Understanding their location and function is crucial for proper operation.

Obrázek 1: Přední strana view of the KOSHIN SEH-25H water pump, showing the pump casing, engine, and carrying handle.

Obrázek 2: Strana view of the pump, highlighting the Honda GXH50 engine with its recoil starter and fuel tank.

Obrázek 3: Přední strana view of the Honda GXH50 engine, showing the air filter housing and engine controls.
Mezi klíčové komponenty patří:
- Motor: Honda GXH50 4-stroke gasoline engine.
- Palivová nádrž: Located on top of the engine, capacity 0.77 L.
- Zpětný startér: Slouží k ručnímu spuštění motoru.
- Čerpadlo Casing: Made of die-cast aluminum, houses the impeller.
- Suction Port (Inlet): 1-inch (25mm) connection for the intake hose.
- Discharge Port (Outlet): 1-inch (25mm) connection for the discharge hose.
- Priming Port: Cap for filling the pump casing with water before starting.
- Vypouštěcí zátka: For draining water from the pump casing.
- Víčko/měrka oleje: Pro kontrolu a doplňování motorového oleje.
- Rukojeť na přenášení: Pro snadnou přepravu.
Nastavení
1. Vybalení a kontrola
Carefully remove the pump from its packaging. Inspect for any shipping damage. Ensure all standard accessories are present: 1 strainer (suction basket), 2 hose nipples, 3 hose bands, and 1 engine tool set.

Figure 4: The product packaging for the KOSHIN SEH-25H, detailing key specifications and included standard accessories.

Obrázek 5: Další view of the product packaging, illustrating performance data and operational guidelines.
2. Přidejte motorový olej
The engine is shipped without oil. Fill the engine crankcase with the recommended 4-stroke engine oil (e.g., SAE 10W-30) up to the upper level mark on the dipstick. Do not overfill. The pump features a low oil safety shutdown.
3. Doplňte palivo
Fill the fuel tank with unleaded gasoline. Ensure the fuel cap is securely tightened after refueling.
4. Připojte hadice
- Sací hadice: Attach a reinforced suction hose (1-inch/25mm diameter) to the suction port. Ensure all connections are airtight to prevent air leaks, which can affect priming. Submerge the strainer end of the suction hose completely in the water source.
- Vypouštěcí hadice: Connect a discharge hose (1-inch/25mm diameter) to the discharge port. Secure with hose bands.
5. Prime the Pump
Before starting, the pump casing must be filled with water. Remove the priming port cap and slowly pour clean water into the pump casing until it overflows. Replace the cap securely. This step is critical for self-priming pumps.
Návod k obsluze
1. Spuštění motoru
- Ensure the pump is on a stable, level surface.
- Open the fuel valve (if applicable).
- Move the choke lever to the "CHOKE" position (cold engine start).
- Move the throttle lever slightly to the "FAST" position.
- Pull the recoil starter handle slowly until resistance is felt, then pull sharply and smoothly. Repeat until the engine starts.
- Jakmile motor nastartuje, postupně posouvejte páčku sytiče do polohy „RUN“, zatímco se motor zahřívá.
- Adjust the throttle to the desired operating speed.
2. Zastavení motoru
- Přesuňte páku plynu do polohy „POMALU“ nebo „VOLNOBĚH“.
- Otočte spínač motoru do polohy „VYPNUTO“.
- Close the fuel valve (if applicable).
3. Obecné provozní pokyny
- Do not run the pump dry. Ensure the suction hose is always submerged in water during operation.
- Monitor the pump for unusual noises or vibrations.
- The pump is designed for clean water with solid particles up to 2mm in diameter. Avoid pumping highly abrasive fluids or large debris.
- The pump can operate for approximately 1 hour on a full tank of fuel.

Figure 6: The KOSHIN 1-inch pump in action, demonstrating its use for washing agricultural equipment. This highlights its versatility for various water transfer tasks.
Údržba
Regular maintenance ensures the longevity and optimal performance of your KOSHIN SEH-25H pump. Always perform maintenance with the engine off and cool.
1. Daily Checks (Before Each Use)
- Zkontrolujte hladinu motorového oleje a v případě potřeby jej doplňte.
- Zkontrolujte hladinu paliva.
- Zkontrolujte hadice a spoje, zda nedochází k únikům nebo poškození.
- Check the suction strainer for blockages.
2. Pravidelná údržba
- Výměna motorového oleje: Vyměňte motorový olej po prvních 20 hodinách provozu, poté každých 50 hodin nebo ročně.
- Čištění vzduchového filtru: Clean the air filter element every 50 hours or more frequently in dusty conditions.
- Kontrola zapalovací svíčky: Zapalovací svíčku kontrolujte a čistěte každých 100 hodin. V případě potřeby ji vyměňte.
- Čerpadlo CasinČištění: Čerpadlo casing can be easily removed for cleaning. Periodically inspect the impeller and volute for debris or wear.
3. Skladování
For extended storage, prepare the pump as follows:
- Drain all fuel from the fuel tank and carburetor.
- Drain water from the pump casing.
- Vyměňte motorový olej.
- Vyjměte zapalovací svíčku a nalijte do válce malé množství motorového oleje. Několikrát zatáhněte za ruční startér, aby se olej rovnoměrně rozprostřel, a poté zapalovací svíčku znovu namontujte.
- Vyčistěte vnější část čerpadla.
- Skladujte na čistém a suchém místě.
Odstraňování problémů
Tato část obsahuje řešení běžných problémů, se kterými se můžete setkat.
| Problém | Možná příčina | Řešení |
|---|---|---|
| Motor nenastartuje | No fuel; Engine oil low; Choke not set correctly; Spark plug faulty; Fuel valve closed. | Add fuel; Add engine oil; Adjust choke; Clean/replace spark plug; Open fuel valve. |
| Pump does not prime / No water flow | Čerpadlo casing not filled with water; Air leak in suction hose/connections; Suction hose not submerged; Suction strainer blocked; Impeller/volute clogged. | Naplňovací čerpadlo casing; Check and tighten all suction connections; Submerge hose fully; Clean strainer; Clean pump casing/impeller. |
| Nízký tlak/průtok vody | Partial blockage in suction/discharge; Air leak; Worn impeller/seals; Engine running too slow. | Check for blockages; Check for air leaks; Inspect and replace worn parts; Increase engine speed. |
| Nadměrné vibrace/hluk | Pump not on level surface; Loose bolts; Debris in pump casing; Worn bearings. | Place on level surface; Tighten all fasteners; Clean pump casing; Contact service for worn bearings. |
Specifikace
Detailed technical specifications for the KOSHIN SEH-25H water pump.
| Model | SEH-25H |
| Výrobce | Koshin Ltd. Japan |
| Typ motoru | Honda GXH50 4-stroke, air-cooled gasoline engine |
| Zdvihový objem motoru | 49 cm³ |
| Výkon motoru | 1.6 kW (2.2 HP) / 7000 rpm |
| Kapacita palivové nádrže | 0.77 l |
| Provozní doba (plná nádrž) | Přibl. 1 hodina |
| Suction/Discharge Port Diameter | 1 palec (25 mm) |
| Max. Discharge Volume | 135 L/min (8.1 m³/h) |
| Max. Vypouštěcí hlava | 43 m |
| Max. sací výška | 8 m |
| Rozměry (D x Š x V) | 405 x 302 x 447 mm (15.9 x 11.9 x 17.6 palce) |
| Hmotnost | 12 kg (26.5 lb) |
| Materiál | Die-cast aluminum pump casing |
| Max. Solid Particle Size | 2 mm |

Figure 7: Performance curve graph for KOSHIN SEH-25H, SEH-25L, and SEV-25L pumps, illustrating the relationship between total head and delivery volume.
Standardní příslušenství
- 1 x Suction Strainer (Basket)
- 2 x Hose Nipples
- 3 x Hose Bands
- 1 x Engine Tool Set
Záruka a podpora
KOSHIN Ltd. is a renowned manufacturer of pumps, known for quality and durability. For warranty information, technical support, or spare parts, please contact your authorized KOSHIN dealer or visit the official KOSHIN website. Always use genuine KOSHIN spare parts to ensure optimal performance and safety.