Vertical Mowing Unit

MOWING

1.Stop tractor by releasing the traction pedal (8, Figure 1), then slowly lower the mower units.

CAUTION: Dropping cutting units abruptly could damage them or the H-frame of the wing mowers.

2.Engage reel control switch (10, Figure 1) to the "On" position.

3.Depress traction pedal to the desired speed (see Traction Pedal on page 9 and Speed Control on page 9). Reel speed is constant and ground speed is variable with the traction pedal. Do not try to regulate ground speed with engine throttle (see Throttle Lever on page 9).

1.Be aware that the blades can extend below the roller. Use care when lowering cutting units down onto a hard surface to avoid bending the blades.

2.Setting the depth of cut: Always start with shallow, less aggressive cuts. Set the blades to zero (blade tips even with bottom of roller). Gradually increase depth of cut until suitable results are obtained (see HEIGHT OF CUT ADJUSTMENT on page 18).

3.Keep in mind that vertical mowing is similar to cutting grass; you can be too aggressive. When vertical mowing grass that has never been vertical mowed, avoid going too deep to start with. Gradually increase the depth of cut to obtain desired results.

CAUTION: Dropping the vertical cutting units abruptly could damage the blades and/or the H-frame of the wing mowers.

HILLSIDE OPERATION

The 8400 has been designed for good traction and stability under normal mowing conditions. However, caution must still be used during slope operation, especially when the grass is wet.

Wet grass limits traction and steering control.

In order to minimize the possibility of tipping, the least dangerous method of operating on hills and terraces is to travel horizontally to the hill. It is also advisable to avoid any unnecessary turns while operating on hills. Use extreme caution and travel at reduced speeds.

1.When operating on hillsides or slopes, maintain full engine speed, but let up on the traction pedal as power requirements increase. This will maintain the performance necessary.

2.It is best to mow along the side of the hill, starting at the bottom and working upwards. This allows the machine to negotiate the slope without mowing in a downhill direction.

3.It is essential for the correct tire pressure to be established for maximum traction and hillside holding.

PUSHING OR TOWING

INSTRUCTIONS

The 8400 has a free-wheeling valve, or “tow valve,” which will permit moving the machine at slow speeds without starting the engine.

Do not exceed 2 mph (3 km/h) while pushing or towing (see Free-Wheeling Valve on page 9).

AFTER OPERATION

1.Clean the entire mower after use. Remove loose grass clippings and caked grass to prevent clogging the vented lubrication points and corroding parts.

2.The engine is air cooled. Do not permit dirt or grass clippings to accumulate on the air intake screen, cylinder heads, or on hydraulic pump cooling fan to prevent serious heat damage to the engine or hydraulic pump.

3.If fan blades become damaged, replace the fan.

GB - 12

99500500-8400 specifications

The National Mower 99500500-8400 is an advanced lawn care solution that epitomizes efficiency and innovation for users who demand high performance from their gardening equipment. Designed for residential and light commercial use, this mower combines state-of-the-art technology with robust features to ensure a seamless mowing experience.

One of the standout features of the National Mower 99500500-8400 is its powerful engine. Equipped with a high-output, fuel-efficient engine, this mower delivers consistent power that translates into excellent cutting performance. This ensures that the mower can tackle various grass types and densities, making it useful for both manicured lawns and rugged terrains.

The 99500500-8400 boasts a durable cutting deck made from high-quality materials that resist corrosion and wear. This deck is designed with precision engineering to enhance airflow for optimal grass clipping discharge, resulting in clean, even cuts regardless of lawn conditions. Furthermore, the adjustable cutting height feature allows users to customize the mower’s settings, enabling them to achieve the desired grass length for their specific needs.

In terms of technology, the National Mower incorporates advanced safety measures to enhance user experience. The intuitive safety features include a blade brake that stops the blades within seconds when the operator releases the handle, reducing the risk of accidents. Additionally, the ergonomic handle design ensures comfort during use, allowing for prolonged operation without strain.

Another impressive characteristic of the 99500500-8400 is its ease of maintenance. The mower is engineered for quick blade sharpening and simple access to engine components, making routine upkeep straightforward for users. This is complemented by a lightweight design that enhances maneuverability, allowing users to navigate through tight spots and around obstacles with ease.

Finally, the National Mower 99500500-8400 is designed with environmental sustainability in mind. The fuel-efficient engine minimizes emissions, making it an eco-friendly choice for consumers looking to maintain their lawns without compromising on their commitment to the environment.

In conclusion, the National Mower 99500500-8400 stands out as a reliable, high-performance lawn mower featuring robust power, safety, and user-friendly characteristics ideal for any homeowner or light commercial user. Its blend of innovative technology and practical design makes it a must-have for efficient lawn care.