1. Inleiding en veiligheidsinformatie
Thank you for choosing the AL-KO Highline 51.9 SP-H Petrol Lawn Mower. This manual provides essential instructions for the safe and efficient operation, maintenance, and troubleshooting of your new lawn mower. Please read this manual thoroughly before initial use and keep it for future reference.
1.1 Algemene veiligheidswaarschuwingen
- Lees de handleiding: Lees en begrijp altijd de volledige gebruiksaanwijzing voordat u de machine in gebruik neemt.
- Persoonlijke beschermingsmiddelen (PBM): Wear appropriate safety gear, including sturdy footwear, long trousers, and hearing protection.
- Blijf vrij: Ensure that other persons, especially children and pets, are kept at a safe distance from the operating area.
- Brandstofbehandeling: Handle fuel with extreme care. Petrol is highly flammable. Refuel outdoors and do not smoke while refueling.
- Helling Bediening: Exercise extreme caution when operating on slopes. Mow across the face of slopes, never up and down.
- Inspectie: Before each use, inspect the machine for damaged parts, loose fasteners, or fuel leaks.
2. Product voorbijview
The AL-KO Highline 51.9 SP-H is a robust petrol lawn mower designed for efficient lawn care. It features a 51 cm cutting width, a powerful 3.2 kW engine, and a self-propelled drive system for effortless operation. Key functionalities include central cutting height adjustment, mulching, and side discharge.

Figure 2.1: AL-KO Highline 51.9 SP-H Petrol Lawn Mower, front-side view.
2.1 Belangrijkste kenmerken
- Snijbreedte: 51 cm for efficient coverage of large areas.
- Motorvermogen: 3.2 kW for reliable performance.
- Zelfrijdend: Wheel drive for reduced effort during operation.
- Centrale maaihoogteverstelling: Easy adjustment from 30 mm to 80 mm.
- 4INONE-functie: Mowing, catching, mulching, and side discharge capabilities.
3. Opstelling en eerste voorbereiding
3.1 Uitpakken en monteren
- Haal alle onderdelen voorzichtig uit de verpakking.
- Unfold and secure the handle assembly using the provided fasteners. Ensure all cables are routed correctly and not pinched.
- Assemble the grass catcher according to the instructions and attach it to the mower.

Figure 3.1: Mower showing the 4INONE function label, indicating versatility.
3.2 Initial Checks and Fueling
- Motorolie: Before first use, check the engine oil level. If necessary, add suitable 4-stroke engine oil up to the 'MAX' mark on the dipstick. Refer to the engine manual for oil specifications.
- Brandstof: Fill the fuel tank with fresh, unleaded petrol (minimum 95 RON). Do not overfill. Ensure the fuel cap is securely tightened.
- Bougie: Verify that the spark plug cable is securely connected to the spark plug.
4. Gebruiksaanwijzing
4.1 Starten en stoppen van de motor
- Beginnend: Ensure the spark plug cable is connected. Push the primer bulb (if equipped) 3-5 times. Hold the engine brake lever (safety bar) against the handle. Pull the starter cord firmly until the engine starts.
- Stoppen: Release the engine brake lever. The engine will stop automatically.
4.2 Maaihoogte aanpassen
The cutting height can be centrally adjusted using a single lever. This mower offers 7 cutting height positions from 30 mm to 80 mm.
- Zorg ervoor dat de motor is uitgeschakeld en dat het blad niet meer draait.
- Locate the central cutting height adjustment lever, typically on the side of the mower deck.
- Pull the lever outwards and move it to the desired height setting. Release the lever to lock it into position.

Figuur 4.1: Zijkant view van de maaier, waarmee het zijn voordelen illustreertfile and handle position.
4.3 Maaitechnieken
- Voor het beste resultaat maait u het gras als het droog is.
- Vermijd het maaien van meer dan een derde van de grashoogte per keer.
- Overlap each pass slightly to ensure an even cut.
- Change mowing direction regularly to prevent matting of the grass.
4.4 Mulchfunctie
The mulching function finely chops grass clippings and returns them to the lawn as natural fertilizer. To engage mulching:
- Verwijder de grasopvangbak.
- Insert the mulching plug into the discharge opening.
- Ensure the mulching plug is securely in place before starting the engine.
4.5 Side Discharge Function
For areas with very tall grass where catching is not desired, the side discharge function can be used.
- Remove the grass catcher and mulching plug.
- Attach the side discharge chute to the side opening of the mower deck.
- Ensure the chute is securely attached before operation.

Figure 4.2: Illustration of MAXAIRFLOW technology, enhancing grass collection and mulching performance.
5. Onderhoud
Regular maintenance ensures the longevity and optimal performance of your AL-KO lawn mower. Always switch off the engine, disconnect the spark plug cap, and allow the engine to cool before performing any maintenance.
5.1 Na elk gebruik
- Schoonmaak: Clean the mower deck, grass catcher, and wheels of grass clippings and dirt. Use a brush or a damp cloth. Do not use high-pressure cleaners.
- Inspectie: Check for any loose screws, nuts, or damaged parts. Tighten or replace as necessary.
5.2 Onderhoud van het mes
The cutting blade should be inspected regularly for wear, damage, or imbalance. A dull or damaged blade can lead to an uneven cut and increased engine strain.
- Verscherping: Have the blade sharpened by a qualified service technician.
- Vervanging: Replace severely damaged or unbalanced blades with genuine AL-KO spare parts.
5.3 Motoronderhoud
Refer to the separate engine manual for detailed maintenance schedules and procedures for the engine components.
- Luchtfilter: Maak het luchtfilter regelmatig schoon of vervang het, vooral in stoffige omstandigheden.
- Bougie: Controleer en reinig de bougie jaarlijks. Vervang hem indien versleten.
- Olie verversen: Change the engine oil after the first 5 operating hours, then annually or every 50 operating hours.
5.4 Opslag
- Maak de grasmaaier grondig schoon.
- Drain the fuel tank or add a fuel stabilizer if storing for more than 30 days.
- Store the mower in a dry, well-ventilated area, protected from frost and direct sunlight.
6. Probleemoplossing
This section provides solutions for common issues you might encounter. For problems not listed here or if solutions do not resolve the issue, contact AL-KO customer support or a qualified service center.
| Probleem | Mogelijke oorzaak | Oplossing |
|---|---|---|
| Motor start niet | No fuel; Spark plug cable loose; Engine brake lever not engaged; Dirty spark plug; Old fuel. | Add fresh fuel; Connect spark plug cable; Hold engine brake lever; Clean/replace spark plug; Drain and refill with fresh fuel. |
| Ongelijkmatig snijresultaat | Dull or damaged blade; Incorrect cutting height; Mowing too fast. | Sharpen/replace blade; Adjust cutting height; Mow at a slower pace. |
| Overmatige trillingen | Bent or unbalanced blade; Loose engine mounting bolts. | Inspect and replace blade if bent/unbalanced; Check and tighten all bolts. |
| Motor verliest vermogen | Dirty air filter; Clogged fuel filter; Low oil level. | Clean/replace air filter; Clean/replace fuel filter; Check and top up oil. |
7. Technische specificaties
| Functie | Specificatie |
|---|---|
| Model | Highline 51.9 SP-H |
| Onderdeelnummer | 119884 |
| Motorvermogen | 3.2 kW |
| Snijbreedte | 51cm |
| Maaihoogte-instelling | Centraal, 7 standen |
| Minimale maaihoogte | 30mm |
| Maximale maaihoogte | 80mm |
| Gewicht | 36.3 kg |
| Geluidsvermogensniveau | 98dB |
| Materiaal | Gelegeerd staal, kunststof |
| Aandrijftype | Zelfaangedreven (wielaandrijving) |
| Functies | Mowing, Catching, Mulching, Side Discharge |
8. Garantie en ondersteuning
Your AL-KO Highline 51.9 SP-H Petrol Lawn Mower is covered by a manufacturer's warranty. Please refer to the warranty card included with your product for specific terms, conditions, and duration. Keep your proof of purchase for warranty claims.
8.1 Klantenservice
For technical assistance, spare parts, or service, please contact your authorized AL-KO dealer or visit the official AL-KO website for contact information in your region. When contacting support, please have your model number (119884) and serial number ready.





