MAINTENANCE

MAINTAINING DEPTH GAUGE CLEARANCE

See Figures 51, 59, and 60.

■Maintain the depth gauge (A) at a clearance of 0.6 mm

(0.025 in.). Use a depth gauge tool for checking the depth gauge clearances.

■Every time the chain is filed, check the depth gauge clearance.

■Use a flat file (B) (not provided) and a depth gauge jointer (C) (not provided) to lower all gauges uniformly. Use a

0.6 mm (0.025 in.) depth gauge jointer. After lowering each depth gauge, restore original shape by rounding the front (D). Be careful not to damage adjoining drive links with the edge of the file.

■Depth gauges must be adjusted with the flat file in the same direction the adjoining cutter was filed with the round file. Use care not to contact cutter face with flat file when adjusting depth gauges.

MAINTAINING THE GUIDE BAR

See Figure 61.

CAUTION:

Make sure the chain has stopped before you do any work on the saw.

Every week of use, reverse the guide bar on the saw to distribute the wear for maximum bar life.The bar should be cleaned every day of use and checked for wear and damage. Feathering or burring of the bar rails is a normal process of bar wear. Such faults should be smoothed with a file as soon as they occur.

A bar with any of the following faults should be replaced:

■Wear inside the bar rails which permits the chain to lie over sideways

■Bent guide bar

■Cracked or broken rails

■Spread rails

In addition, lubricate guide bars (with a sprocket at their tip) weekly. Using a grease syringe, lubricate weekly in the lubricating hole.

Turn the guide bar and check that the lubrication holes (A) and chain groove are free from impurities.

MAINTAINING THE SAFE-T-TIP® NOSE GUARD

See Figures 62 and 63.

CAUTION:

Make sure the chain has stopped before you do any work on the saw.

WARNING:

Although the guide bar comes with a SAFE-T-TIP® anti-kick-back device already installed, you need to check the tightness of the mounting screw before each use.

Tighten the mounting screw (A) of the nose guard as instructed below. These are specially hardened screws. If you cannot install the screw tightly, replace both the screw and the SAFE-T- TIP® (B) before further operation. Do not replace the screw with an ordinary screw.

In addition to preventing chain contact with solid objects at the nose of the bar, the SAFE-T-TIP® also helps keep the chain away from abrasive surfaces, such as the ground. Keep it on the right-hand side of the bar where it will be between the chain and the ground during flush with ground cutting.

The mounting screw requires a 5/16 in. spanner (or adjustable spanner) to achieve the recommended tightness of 4-5 Nm (35 - 45 in. lb.). A tightness within this range can be achieved by using the following method.

1.Tighten the screw with your finger.

2.Tighten the screw an additional 3/4 of a turn using a spanner (C).

MOUNTING THE SAFE-T-TIP® NOSE GUARD

See Figures 62 and 63.

1.Mount the SAFE-T-TIP® on the bar nose.

2.Fit the locking rivet or tab in the recessed hole in the guide bar.

3.Tighten the screw with your finger.

4.From the finger-tight position, tighten the screw an additional 3/4 of a turn using a spanner.

CLEANING THE AIR FILTER

See Figures 64, 65, and 66.

NOTE: Always clean the air filter before making any mixture adjustments of the carburettor.

1.For access to the air filter and carburettor area, loosen the three screws (A) holding the cylinder cover (B).

2.Activate chain brake.

3.Lift the front of the cylinder cover past chain brake lever.

4.Lift the back of the cylinder cover past the handle.

5.Before removing the air filter from the carburettor, blow or brush as much loose dirt and sawdust from around the carburettor and chamber as possible.

NOTE: Be sure to pull the choke rod out to keep the carburettor from being contaminated.

6.Remove the screw (C) securing the air filter (D).

7.Position a flat screw driver between the tabs and twist as shown in the illustration.

8.Lift the air filter off the air filter base.

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Homelite UT74121D Maintaining the Guide BAR, Maintaining the SAFE-T-TIP Nose Guard, Mounting the SAFE-T-TIP Nose Guard
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UT74121D specifications

The Homelite UT74121D is a versatile and efficient string trimmer designed for homeowners and gardening enthusiasts who seek an effective solution for lawn maintenance. This machine excels at tackling overgrown grass, weeds, and edging tasks, offering performance and convenience.

One of the standout features of the Homelite UT74121D is its powerful 14-amp electric motor. This robust motor delivers consistent performance and ample cutting power, making it suitable for various landscaping tasks. Unlike gas-powered trimmers, the electric motor ensures quieter operation with zero emissions, making it an environmentally friendly choice.

The trimmer is equipped with a 17-inch cutting width, providing an expansive area for trimming, thus reducing the time needed to complete yard work. Featuring a dual-line feed system, the UT74121D allows for efficient cutting. The automatic line advance ensures that users can focus on their trimming without frequent interruptions to replace the line.

The lightweight design of the Homelite UT74121D contributes to its user-friendliness. Weighing in at just over 10 lbs, it is easy to maneuver, making it suitable for both large yards and tight spaces. The balanced design helps reduce user fatigue, allowing for longer periods of use without strain.

Another key characteristic of the UT74121D is the adjustable telescopic shaft. It can be extended or shortened to accommodate users of different heights, enhancing comfort and control during operation. This customizable feature enables better ergonomics and reduces the risk of back strain.

The Homelite UT74121D also incorporates a convenient pivoting head that allows for versatile trimming positions. This feature is particularly useful for edging alongside sidewalks and driveways, as well as for accessing hard-to-reach areas, making it a multi-functional tool for comprehensive yard work.

Moreover, the trimmer comes with a safety guard to protect the user from flying debris, promoting a safer mowing experience. The straightforward assembly and operation further appeal to users, with easy-to-follow instructions that make setup a breeze.

In conclusion, the Homelite UT74121D string trimmer is a practical and efficient tool for homeowners looking to maintain their lawns effectively. With its powerful motor, expansive cutting width, lightweight design, adjustable shaft, and safety features, this trimmer checks all the boxes for a reliable gardening companion. Whether you’re edging, trimming, or maintaining your yard, the UT74121D is designed to meet your landscaping needs with ease and efficiency.
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