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
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