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Repair

< 3 > Disassembling Gear Housing (cont.)

3.Remove four 5x25 tapping screws and two 5x55 tapping screws as illustrated in Fig. 6.

Removal of the screws will release tubular handle from gear housing.

4.Remove tubular handle from the bottom side of gear housing L as illustrated to left in Fig. 7.

5.Remove gear housing R from gear housing L as illustrated to right in Fig. 7.

Fig. 7

Fig. 6

Tubular handle

Tapping screw 5x25

Tapping screw 5x55

Tubular handle

Oil tank

Gear housing L

Gear housing R

Gear housing L

<4 > Replacement of Straight Bevel Gear 43 and Oil Pump Complete

1.Remove gear housing R from gear housing L as described in "<3> Disassembling Gear Housing". (Fig. 5, 6, 7)

2.Remove ball bearing 608ZZ using Bearing extractor (No.1R269) (Fig. 8)

3.Remove safety washer from spindle. And now straight bevel gear 43 can be removed from spindle. (Fig. 8)

Note: Before installing a brand-new straight bevel gear 43, be sure to apply 3g of Makita grease N No.1 to its gear teeth.

Fig. 8

[Gear housing viewed from the position A]

A

Straight bevel gear 43

Safety washer

Ball Bearing 608ZZ

Bearing extractor

(No.1R269)

(to be continued to next page)

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Makita UC4503A, UC4003A Repair Disassembling Gear Housing, Replacement of Straight Bevel Gear 43 and Oil Pump Complete
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UC3003A, UC3503A, UC4003A, UC4503A specifications

The Makita UC4503A, UC3003A, UC4003A, and UC3503A are cutting-edge electric chain saws designed to meet the needs of both professionals and DIY enthusiasts. Each model incorporates advanced technologies and features that enhance performance, safety, and user comfort.

Starting with the UC4503A, this model boasts a powerful 2000W motor that delivers robust performance, making it suitable for intensive cutting applications. The high chain speed of 14.5 m/s enables fast and efficient cutting, allowing users to tackle demanding jobs with ease. This model also features an automatic chain lubrication system, ensuring smooth operation and extending the life of the chain. Its lightweight design and ergonomic handle provide comfortable handling, reducing fatigue during prolonged use.

The UC3003A is equipped with a 1800W motor, striking a balance between power and weight. It features a 30 cm (12") guide bar, ideal for homeowners looking to manage tree pruning and light to medium cutting tasks efficiently. The instant start feature eliminates the need for pull cords, making it user-friendly, particularly for those less experienced with chainsaws. The integrated chain brake enhances user safety by stopping the chain's movement in emergencies.

Meanwhile, the UC4003A model is designed with versatility in mind, featuring a 2000W motor and a 40 cm (16") bar length that allows for wider cuts. It also incorporates an electronic brake that stops the chain in seconds, providing an additional safety layer for operators. The model's rubberized grip ensures a secure and comfortable hold, even in challenging conditions, making it a reliable option for varied cutting tasks.

Lastly, the UC3503A combines a 1800W motor with a mid-size 35 cm (14") bar, providing an excellent compromise between weight and cutting capability. This model is particularly beneficial for those who require efficiency without excess weight. Its design includes a tool-less chain adjustment system, enabling quick and easy maintenance.

In summary, the Makita UC series of electric chain saws are engineered for performance, safety, and user comfort. With their powerful motors, automatic lubrication systems, and various safety features, these models are suitable for both professionals and general users, offering reliability and convenience for a wide range of cutting tasks. Whether pruning trees, cutting firewood, or managing yard debris, the UC4503A, UC3003A, UC4003A, and UC3503A stand out as high-quality options for anyone in need of a dependable electric chainsaw.
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