Brush Inspection And Replacement - Porter-Cable 3807 Instruction Manual

4 . Remove arbor screw (E) Fig. 52, by turning screw
(E) clockwise while at the same time pressing in on arbor
lock (F) Fig. 53, to keep arbor from turning. Remove
screw (E) Fig. 52, outside blade flange (H) and blade (J).
DO NOT REMOVE INSIDE BLADE FLANGE.
5 . Make sure the inside surfaces of both the inside and
o u tside blade flanges are clean and free from any
foreign substance.
6 . Make sure the inside blade flange is completely on
t h e a r b o r w i t h t h e f l a ts in the flange engaged with the
f l a ts on the arbor.
7 . I n s tall new blade (J) Fig. 52, outside blade flange
(H) and arbor screw (E). Turn arbor screw (E)
counterclockwise to tighten while pressing in on arbor
lock (F) Fig. 53, to keep arbor from turning.
IMPORTA N T: Make sure flats i n o u tside blade flange
(H) Fig. 52, are engaged with flats on arbor shaft and that teeth of saw blade (J) are pointing down at the front,
as shown in Fig. 52.
8 . Rotate arbor cover (C) Fig. 51, until hook in cover is engaged under screw (B) and tighten screw (B) which
was loosened in STEP 2.

BRUSH INSPECTION AND REPLACEMENT

CAUTION: BEFORE INSPECTING BRUSHES, DISCONNECT THE MACHINE FROM THE POWER
SOURCE.
Brush life varies. It depends on the load on the motor. Check the brushes after the first 100 hours of use for a new
machine, or after a new set of brushes has been insta l l e d .
A fter the first check, examine them after about 10 hours of use until such time that replacement is necessary.
The brush holders (A) Fig. 54, are located on the motor housing opposite each other. F i g . 5 5 , i l l u s t r a t e s o n e o f
the brushes removed for inspection. When the carbon on either brush (B) is worn to
spring or shunt wire (C) is burned or damaged in any way, replace both brushes. If the brushes are found
serviceable after removing, reinstall them in the same position as removed.
A
Fig. 54
F
17
Fig. 53
3 " i n l e n g t h o r i f e i t h e r
...
16
C
B
Fig. 55