Stihl BT 131, Service Manual

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BT 131 21
13.1 Special Servicing Tools, Servicing Aids
–
Socket, T27 – 0812 542 2104
–
Installing sleeve (5) – 1115 893 4600
–
Press arbor – 1117 893 7200
–
Press arbor – 4119 893 7200
–
Torque wrench – 5910 890 0302
–
Screwdriver, T27x200 – 5910 890 2415
–
Hot air blower
–
Pin punch, 5 mm (1/4 in)
–
STIHL multipurpose grease – 0781 120 1110
–
STIHL gear grease – 0781 120 1118
–
Dirko HT red sealant – 0783 830 2000
13.2 Disassembling the Gearbox
N
Preparations,
@
3.1.
N
Remove handlebar together with control handle,
@
5.2.
N
Remove the powerhead,
@
7.2.
N
Remove clutch housing together with gearbox,
@
9.2.
N
Remove clutch housing from the gearbox,
@
9.4.
N
Take out the screw (3).
N
Insert 5 mm / 1/4in diameter pin punch (11) through
bore (arrow) and tap to release the gearbox housing
(1)
N
Pry the gearbox housing (1) off the gearbox cover (3).
N
Pull the output shaft (9) with gear (10) out of the ball
bearing.
N
Push the output shaft (9) out of the gear (10).
N
Heat the gearbox cover (4) in bearing seat area to
about 120°C (250°F).
N
Knock the gearbox cover (4) against a wooden base
until the ball bearings (7 and 8) fall out.
N
Use 5 mm / 1/4in diameter pin punch to remove the
oil seal (6).
N
Heat the gearbox housing (1) in bearing seat area to
about 120°C (250°F).
N
Use press arbor 4119 893 7200 to remove ball
bearing (2) from the gearbox housing (1).
13 Gearbox
9
8
4
7
6
5
10
3
M5x28 (8 Nm / 71 lbf. in.)
1
2
0000-GXX-2682-A0
11
1
4
0000-GXX-2713-A0