Screw Fasteners; Hydraulic Couplings - Husqvarna P 520D Workshop Manual

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 Size
8 mm
10 mm
- -
13 mm
- -
17 mm
17 mm
18-19 mm
24 mm
30 mm
32 mm
Certain unions are screwed into the goods with a
through screw and a lock nut. The thread in the
goods is intended to take the effective torque and
the lock nut 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 lock nut, which is tightened with
less torque. If the lock nut 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

Screw Fasteners

Allen Key
4 mm
5 mm
3 mm
6 mm
4 mm
8 mm
- -
10 mm
- -
- -
- -
3. Lock nut
Thread
M5
M6
M6
M8
M8
M10
M10 12.9
M12
M16
M20
- -

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
Tightening Torques
52 ft/lb (6 Nm)
52 ft/lb (10 Nm)
52 ft/lb (10 Nm)
52 ft/lb (24 Nm)
18 - 20 Nm
52 ft/lb (47 Nm)
52 ft/lb (70 Nm)
52 ft/lb (81 Nm)
80 ft/lb (110 Nm)
52 ft/lb (200 Nm)
Hydraulic couplings, see
separate chapter.
2
7
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