Servicing the Spark Plug

Maintenance

and retain the hose. Wipe up any excess oil on the frame (Figure 25).

Note: Dispose of the used oil at a recycling center.

10.Apply a thin film of clean Exmark 4-Cycle Premium Engine Oil to the rubber gasket on the new filter.

11.Install the replacement oil filter to the mounting pad. Turn the oil filter clockwise until the rubber gasket contacts the pad, then tighten the filter an additional 1/2 to 3/4 turn.

12.Slowly pour approximately 80% of the specified oil into the filler tube—use oil recommended in the Checking the Oil Level section.

13.Install the oil fill cap/dipstick and push into place, but Do Not screw it in.

14.Check the oil level (Figure 24); refer to Checking the Oil Level section.

15.Slowly add additional oil to bring it to the full mark. Do Not overfill.

16.Install the oil fill cap/dipstick.

17.Start the engine and check for leaks.

Service Interval: Every 200 hours/Every 2 years (whichever comes first)

Every 500 hours—Replace the spark plug.

As stated in the maintenance intervals, remove the spark plug, check condition, and reset the gap or replace with a new plug as necessary.

The spark plug is RFI compliant. Equivalent alternate brand plugs can also be used.

Type: NGK BPR4ES (or equivalent)

Air Gap: 0.030 inch (0.76 mm)

Removing the Spark Plug

1.Disengage the blade control switch, move the motion controls outward to the park position, stop the engine, and remove the key.

2.Pull the wire off of the spark plug (Figure 26). Clean around the spark plug to prevent dirt from falling into the engine and potentially causing damage.

Note: Due to the deep recess around the spark plug, blowing out the cavity with compressed air is usually the most effective method for cleaning. The spark plug is most accessible when the blower housing is removed for cleaning.

3. Remove the spark plug and metal washer.

Figure 26

1.Spark plug and wire location

Checking the Spark Plug

1.Look at the center of the spark plug (Figure 27). If you see light brown or gray on the insulator, the engine is operating properly. A black coating on the insulator usually means the air cleaner is dirty.

Important: Never clean the spark plug. Always replace the spark plug when it has a black coating, worn electrodes, an oily film, or cracks.

2.Check the gap between the center and side electrodes (Figure 27). Bend the side electrode if the gap is not correct.

Figure 27

1. Side electrode

3. Air gap (not to scale)

2.Center electrode insulator

Installing the Spark Plug

1.Install the spark plug. Make sure that the air gap is set correctly.

2.Tighten the spark plug to 16 ft-lb (22 N-m).

3.Push the wire onto the spark plug (Figure 26).

4501-191 Rev.A specifications

The Exmark 4501-191 Rev.A is a cutting-edge lawn mower designed to deliver exceptional performance and efficiency for both residential and commercial users. With its robust build and advanced technology, this model has quickly gained popularity among landscapers and homeowners alike.

One of the standout features of the Exmark 4501-191 Rev.A is its powerful engine. Equipped with a high-performance Kohler engine, this mower provides ample horsepower and torque, ensuring efficient cutting even in tough conditions. This allows users to tackle dense grass and uneven terrains with ease, making it ideal for various landscaping needs.

The mower's innovative cutting system is another highlight that sets it apart. Featuring a large, durable cutting deck, the Exmark 4501-191 Rev.A offers an impressive cutting width, enabling users to cover more ground in less time. The deck is designed for precision, providing a clean and even cut every time. Additionally, the adjustable cutting height feature allows for customized lawn care, accommodating different grass types and lengths.

One of the remarkable technologies integrated into the Exmark 4501-191 Rev.A is its efficient fuel system. The mower is engineered to maximize fuel efficiency, allowing users to extend their mowing sessions without the frequent need to refuel. This feature not only saves time but also reduces overall operating costs, making the mower a cost-effective choice for users with large properties.

Comfort and maneuverability are also key characteristics of the Exmark 4501-191 Rev.A. The ergonomic controls are designed for ease of use, providing a smooth and responsive experience. The mower features large rear wheels and front casters, allowing for agile navigation around obstacles and tight spaces. This is particularly beneficial for commercial users who often work in complex environments.

Maintenance is simplified with the Exmark 4501-191 Rev.A, allowing users to focus on lawn care rather than upkeep. The model is built with durable materials, ensuring longevity and reducing wear and tear. Clear access points for cleaning and maintenance further enhance user convenience, making it easy to keep the mower in top shape.

In summary, the Exmark 4501-191 Rev.A is a high-performance lawn mower that combines power, efficiency, and ease of use. With its advanced engine, innovative cutting system, and user-friendly design, it stands out as an excellent choice for anyone looking to achieve a beautifully manicured lawn. Whether for commercial or residential use, this mower is a reliable tool that promises exceptional results.

Exmark 4501-191 Rev.A Servicing the Spark Plug, Removing the Spark Plug, Checking the Spark Plug

Models: 4501-191 Rev.A