Screw Fasteners; Hydraulic Couplings - Husqvarna RC 318T Workshop Manual

Service tools

3.2 Screw fasteners

Metric threads are used on the product.
Some bolt fasteners are locked with screws treated
with Eslok ® Nylon 180°. The screw threads have a
red coating. These screws can be refitted 3 times
before they have to be replaced.
Always torque tighten screw unions as given in the
table, unless specified otherwise in the instruction.
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
12 – English
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

3.3 Hydraulic couplings

When hydraulic hoses and pipes that are NOT
specified on the next page, are assembled, first
tighten their cap nuts by hand to a 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
2