Husqvarna 390XP Workshop Manual page 14

Chain brake
5.3 Assembly
WARNING!
Make sure the spring does not fly out
and cause injury. Wear eye protection
Assemble the chain brake:
1. Fit the toggle joint and brake strap. See fig. 9.
2. Grease the moving parts of the toggle joint (J) and fit
the unit on the chain saw. See fig. 10.
Compress the spring and press it in place.
3. Grease and fit the lever (I). See fig. 7.
4. Grease and fit the retaining bush (H) withspring. See
fig. 7.
5. Fit the cover over the chain brake mechanism. Four
bolts (B). Tighten the bolts to 4 Nm. See fig. 1.
6. Fit the chain guide-plate with bolt (A). See fig. 1.
7. Fit the hand guard with the sleeve on the starter side.
See fig. 2.
8. Push back the hand guard so that the chain brake is
in the off position.
9. Check that the brake strap is correctly positioned in
the recess (K) in the crankcase. See fig. 10.
10. Fit the clutch hub on the crankshaft and tighten with
the clutch tool. Note – left-hand thread! See fig. 11.
11. Remove the piston stop and fit the spark plug and
put on the ignition cable.
12. Grease in the needle bearing before fitting. Fit the
clutch drum (E) with needle bearing (F) and chain
drive sprocket (G). See fig. 3.
13. Fit the washer (D) and locking ring (C). See fig. 4.
14. Fit the cylinder cover, chain and bar. See Operators
Manual.
NOTE!
After repair of the chain brake. The chain brake
must be tested as described in Function check.
5.4 Function test
For this test, the engine must not be running. Check that
the chain brake engages as follows:
Hold the chainsaw over a stable surface as shown in fig
12. The distance between the bar and surface is given in
the table below.
Bar length, L
15 - 20 Inches
21 - 28 Inches
29 - 32 Inches
Let go of the front handle and let the chainsaw pivot
round on the rear handle.
1. When the bar hits the surface the chain brake
should engage..
14 - English
Height, H
50 cm
70 cm
80 cm
Fig. 8
F
Fig 10
Fig 11
Fig. 9
Fig. 12
E
C
H
L