Figure 14
Blade Bell
Support
Hex Bolt

Blade Care and Replacement

WARNING: When removing the cutting blade for sharpening or replacement, protect your hands with a pair of heavy gloves or use a heavy rag to hold the blade.

Periodically inspect the blade adapter for cracks, especially if you strike a foreign object. Replace when

necessary. Follow the steps below for blade service:

Blade

Adapter

 

• Disconnect spark plug wire from spark plug.

• Tip mower as specified in separate engine manual. If it does not specify turn mower on its side making sure that the air filter and the carburetor are up.

• Remove the bolt and the blade bell support which hold the blade and the blade adapter to the engine crankshaft. See Figure 14.

• Remove blade and adapter from the crankshaft.

• The blade may be resharpened by removing it and either grinding or filing the cutting edge keeping as close to the original bevel as possible. Do not attempt to sharpen the blade while it is still on the mower.

•It is extremely important that each cutting edge receives an equal amount of grinding to prevent an unbalanced blade.

NOTE: Improper blade balance will result in excessive vibration causing eventual damage to the engine and mower. Be sure to carefully balance blade after sharpening. Possible damage resulting from blade unbalance condition is not the responsibility of the manufacturer.

NOTE: Always remove blade from the adapter for testing balance.

•The blade can be tested for balance by balancing it on a round shaft screwdriver. Remove metal from the heavy side until it balances evenly.

•Before reassembling the blade and the blade adapter to the unit, lubricate the engine crankshaft and the inner surface of the blade adapter with light oil.

•Install the blade adapter on the crankshaft with the “star” away from the engine. See Figure 14. Place the blade with the side marked “bottom” (or with part number) facing away from the adapter. Align the blade bell support over the blade with the tabs in the holes of the blade and insert the hex bolt.

•Tighten the hex bolt to the torque listed below:

Blade Mounting Torque

Center Bolt 450 in. lb. min., 600 in.lb. max.

To insure safe operation of your unit, ALL nuts and bolts must be checked periodically for correct tightness.

NOTE: Cutting grass in sandy soil condition causes abrasive wear to the blade.

Off-Season Storage

The following steps should be taken to prepare your lawn mower for storage.

1. Clean and lubricate mower thoroughly as described in the lubrication instructions.

IMPORTANT: We do not recommend the use of a pressure washer or garden hose to clean your unit.

2.Refer to engine manual for correct engine storage instructions.

3.Coat mower’s cutting blade with chassis grease to prevent rusting.

4.Store mower in a dry, clean area. Do not store next to corrosive materials, such as fertilizer.

NOTE: When storing any type of power equipment in a poorly ventilated or metal storage shed, care should be taken to rust-proof the equipment. Using a light oil or silicone, coat the equipment, especially cables and all moving parts of your lawn mower before storage.

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MTD 503 manual Blade Care and Replacement, Off-Season Storage, Blade Mounting Torque
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503 specifications

The MTD 503 is a versatile and innovative piece of machinery designed for a variety of agricultural and gardening applications. Known for its durability and efficiency, the MTD 503 has become a favorite among both professional landscapers and home users. This powerful equipment boasts numerous features and technologies that enhance its performance and user experience.

One of the standout characteristics of the MTD 503 is its robust engine, which typically comes in a 4-stroke configuration. This design not only ensures superior power output but also contributes to lower emissions and reduced fuel consumption. The engine is paired with an ergonomic design that allows for easy handling and maneuverability, making it suitable for different types of terrain.

The MTD 503 is equipped with a wide cutting deck that allows for efficient grass cutting, while its adjustable height settings cater to various lawn types and preferences. Users can effortlessly switch between different cutting heights, ensuring precision and an aesthetically pleasing lawn finish. Additionally, the model often features a mulching function, enabling the user to recycle grass clippings back into the lawn, promoting a healthier green space.

In terms of technology, the MTD 503 is designed with user-friendly controls that enhance the operational experience. The intuitive dashboard provides easy access to all essential functions, allowing users to operate the machine with minimal complexity. Safety features, such as automatic shut-off systems and easy-to-reach emergency stops, are integrated into the design, ensuring that user safety is prioritized at all times.

Durability is another key characteristic of the MTD 503. Built with high-quality materials, it withstands harsh conditions and requires minimal maintenance, offering long-term reliability. The wheels are constructed for superior traction and stability, making it well-suited for various landscaping tasks, from mowing to hauling equipment.

In conclusion, the MTD 503 stands out in the realm of gardening and landscaping equipment due to its powerful engine, thoughtful design, and advanced technology. Its multiple features make it a practical choice for users seeking efficiency and ease of use in their gardening endeavors. Whether tending to residential lawns or managing larger landscapes, the MTD 503 is equipped to deliver exceptional results time and again.
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