ADJUSTING THE UPPER BLADE GUIDES AND BLADE SUPPORT BEARING

Adjust the upper blade guides and blade support bearings ONLY AFTER the blade has the correct tension and is tracking properly. To adjust, do the following:

DISCONNECT MACHINE FROM POWER SOURCE

1. Make sure that the bottom blade guides and support

bearings are not touching the blade.

2. Check the upper blade guide assembly. The blade

guides (A) Fig. 54 should be parallel to the blade. To

adjust, loosen the screw (B) and rotate the complete

guide assembly (C). When the blade guides are parallel

with the blade, tighten the screw (B).

3. Adjust the guides (A) Fig. 55 so that the front edge of

the guides are just behind the “gullets” of the saw teeth.

The complete guide block bracket can be moved in or

out by loosening the thumb screw (C) and turning the

knurled knob (D) Fig. 55. When the guides (A) are set

properly, tighten thumb screw (C).

4. Two set screws (B) Fig. 55 hold the upper blade

guides (A) in place. Loosen the set screws (B) to move

the guides (A). Place them as close as possible to the

side of the blade. (Be careful not to pinch the blade).

Tighten the screws (B).

5. When the blade guide wears to a point that it cannot

be adjusted close to the blade, loosen screw (B) Fig. 55

and reverse the blade guides (A) Fig. 55.

CB

A

Fig. 54

F

G

H

6. The upper blade support bearing (E) Fig. 55 prevents

damage to the set in the saw teeth by keeping the blade

E

D

C

from being pushed too far toward the back. The support

bearing (E) should be set 1/64" behind the blade by

loosening the thumb screw (F) and turning the knurled

knob (G) to move the support bearing (E) in or out.

7. Adjust the blade support bearing (E) so that the back

edge of the blade overlaps the outside diameter of the

ball bearing by about 1/16". The bearing (E) is set on an

eccentric. To change the position, remove the screw (H)

and bearing (E) Fig. 55. Loosen the thumb screw (F),

back out the knurled knob from the set screw. Remove

the hex shaft from the hole, and rotate it to move the

eccentric for the bearing.

A B

BA

Fig. 55

21

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Porter-Cable 28-475X, 28-248 instruction manual Adjusting the Upper Blade Guides and Blade Support Bearing
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28-475X, 28-248 specifications

The Porter-Cable 28-248 and 28-475X are two impressive models from Porter-Cable, a brand known for its high-quality power tools that cater to the needs of both professionals and DIY enthusiasts. These models are designed to deliver reliable performance, durability, and innovative features suitable for a wide range of applications.

The Porter-Cable 28-248 is a 28-gauge pneumatic brad nailer. This tool is compact and lightweight, making it easy to maneuver in tight spaces. One of its standout features is the tool-free depth of drive adjustment, allowing users to modify the depth of the nails without additional tools. This is particularly useful when working with different materials or when precision is paramount.

The 28-248 is equipped with a rear exhaust that directs air away from the user, keeping the workspace clean and enhancing comfort during operation. The integrated power adjustment dial lets users adjust the power depending on the material being used, providing versatility across various projects. Additionally, the 28-248 features a reload indicator that signals when it's time to refill the magazine, preventing interruptions during work.

On the other hand, the Porter-Cable 28-475X is a more robust option designed for industrial applications. It is a 27-gauge nail gun that offers a higher capacity magazine for less downtime. The 28-475X features a stainless steel magazine that ensures durability and smooth operation while reducing the risk of jams.

This model also includes a selective actuation switch, allowing users to choose between sequential and contact firing modes based on their needs. The built-in dry fire lockout mechanism is another valuable feature that prevents the tool from firing without nails, which prolongs its lifespan and ensures safety.

The ergonomic design of both models emphasizes user comfort, with features like rubber grips that minimize fatigue during prolonged use. Both tools are compatible with a variety of nail sizes and types, making them suitable for a range of tasks from cabinetry to flooring installations.

In summary, the Porter-Cable 28-248 and 28-475X stand out for their innovative features, ergonomic designs, and flexibility in application. Whether you're a contractor or a DIY hobbyist, both models offer the durability and performance needed to tackle any job efficiently.
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