Screw Fasteners - Husqvarna P524 Workshop Manual

3.2 Screw fasteners

Metric threads are used on the machine.
Some bolt fasteners are locked with screws treated
with Eslok ® Nylon 180°. The screw threads have a
red coating. These screws can be refitted three
times before having to be replaced.
Always torque tighten screw unions to the specified
torque table unless specified otherwise in the text.
Spanner Allen Key
Size
8 mm 4 mm
10 mm 5 mm
- - 3 mm
13 mm 6 mm
- - 4 mm
17 mm 8 mm
17 mm - -
18-19 mm 10 mm
24 mm - -
30 mm - -
32 mm - -
Certain unions are screwed into the goods with a
through screw and a locknut. The thread in the
goods is intended to take the effective torque and
the locknut is to secure the union during use.
Therefore, the main part of the torque - screw in the
goods - should always be tightened first and then
secured with the locknut, which is tightened with
less torque. If the locknut is tightened with too high a
torque, the screw in the goods thread will be
unstressed and the bolt fastening will come loose
during use.
1
2
3
1. Screw
2. Goods thread
Thread Tightening
torques
M5 52 ft/lb (6 Nm)
M6 52 ft/lb (10 Nm)
M6 52 ft/lb (10 Nm)
M8 52 ft/lb (24 Nm)
M8 18 - 20 Nm
M10 52 ft/lb (47 Nm)
M10 12.9 52 ft/lb (70 Nm)
M12 52 ft/lb (81 Nm)
M16 80 ft/lb (110 Nm)
M20 52 ft/lb (200 Nm)
- - Hydraulic
couplings, see
separate chapter.
3. Locknut
Hydraulic Couplings
When assembling hydraulic hoses and pipes, first
tighten their cap nuts by hand to stop. Then tighten a
further 1½ flats of the wrench grip. This corresponds
to an approximate 90° turn.
1
1. Starting point
2. Torqued position = 1.5 flats = 90° angle
Service tools
2
English – 11