Stihl BT 131, Service Manual

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BT 131 17
N
Take out the screw (13).
N
Pry out the insert (14).
N
Pry the brake band (15) out of its seat (arrow).
Do not overstretch the brake band (15).
N
Disengage the auger brake.
N
Unhook the brake band (15) from the lever (9).
N
Check brake band (15) for wear,
@
11.4.
11.4 Checking Brake Band for Wear
Install a new brake band if one of the following points
applies:
–
Large areas of wear on inside.
–
Partially worn areas on outside.
–
Thickness of brake band less than 0.9 mm / 0.035 in
at any point.
11.5 Removing the Brake Lever
N
Remove the brake band,
@
11.3.
N
Engage the auger brake.
N
Use assembly tool 1117 890 0900 (19) to unhook
brake spring (16) from anchor pin (17, arrow).
N
Unscrew the bearing pin (1).
N
Remove the E-clip (10).
N
Push out the retainer (2).
N
Pull out the brake lever (9).
11.6 Removing the Flat Springs
N
Remove the brake lever,
@
11.5.
N
Take out the screw (3).
N
Remove the hooked flat spring (4).
N
Remove the two flat spring (5).
N
Take out the nut (6).
11.7 Removing the Pins
N
Remove the flat springs,
@
11.6.
N
Use 3 mm (1/8 in) diameter pin punch to drive out pin
(8) from the outside.
N
Use 3 mm (1/17 in) diameter pin punch to drive out
pin (8) from the outside.
11.8 Installing the Pins
N
Coat knurled portion of new pins (8 and 17) with
Loctite 242.
N
Insert the pins (8 and 17) in the bores so that their
knurling meshes with the knurling in the clutch
housing (7).
N
Drive pin (17) home until height
‘a’ is about 5.5
-
5.7 mm (about 0.22 in).
N
Drive pin (8) home until height ‘b’ is
about 6.0
-
6.2 mm (about 0.24 in).
N
Install the flat springs,
@
11.10.
15
14
13
0000-GXX-2681-A0
19 16
0000-GXX-2714-A0
8
17
0000-GXX-2715-A0
8
17
a
b
0000-GXX-2716-A0