Adjustment; Hydraulic Hoses And Couplings - Husqvarna PP 518 Manuel D'utilisation

Adjustment

In the PP518, the pressure at which the throttle valve reacts,
is adjusted to achieve the required function of a specific tool
and condition.
1 Connect the hoses and the tool to be used.
2 Set the switch for the automatic throttle to position 1.
3 Set the flow switch to a suitable setting for the tool.
CAUTION! If the oil is cold, the counter pressure in the
system triggers full throttle.
4 Allow the hydraulic oil to heat up for 1 to 2 minutes. It is
now ok to begin working. The hydraulic oil reaches a
stable operating temperature in about 5 to 10 minutes.
5 If the machine has been running for 10 minutes and the
automatic throttle function is not working correctly, the
pressure's threshold value between idling and full throttle
can be adjusted.
6 Adjust the pressure in the throttle's pressure sensor with
an 8 mm or 5/16" hex wrench.
If the hydraulic unit's engine is still at full throttle without
engaging the tool and hydraulic oil is hot. Turn the
adjustment screw clockwise 1/8
the correct operation is obtained.
If the hydraulic unit's engine still idles when the tool is
engaged and work well, but the oil is cold. Turn the
adjustment screws counter clockwise 1/8
time until the correct operation is obtained.
12 –
English
OPERATING
th
of a turn at a time until
th
of a turn at a

Hydraulic hoses and couplings

The PP518 is fitted with a 7.5 m (25 ft) long hose with an inner
diameter of 12.7 mm (1/2 in). ONE additional half-inch hose
10 m (33 ft) long can be fitted (18-20 m/60-65 ft in total). If you
need a longer hose for your application, we recommend:
Maximum hose extension - up to a total length of 40 m (130
ft).
• Use the 7.5 m (25 ft) long hose that is supplied with the
power unit.
• Connect two 16-metre (53 ft) extension hoses with a
diameter of at least 16 mm (5/8 in).
A 32 metre (100 ft.) hose length can also be used, but it is
cumbersome to handle.
We strongly recommend using HTMA "Flat Face" compatible
hydraulic couplings.
IMPORTANT! The hydraulic hoses and
!
couplers must have a rated pressure
capacity of 140 bar (2,000 psi) with a safety
factor of 4 to 1.
CAUTION! The flow direction through the system is always
from the male to the female coupling. This means that all
extension hoses must be assembled in the same way. If
there is a male coupling at one end of a hose, there must
always be a female coupling at the reverse end. Never use
two of the same type of coupling on a single hose.
IMPORTANT! The hydraulic oil and,
!
consequently, the hoses and hydraulic
couplings can become scalding during
normal operation.
A hydraulic coupling at a temperature of 50 °C (120 °F) is
experienced as HOT when touched. It is normal for the oil
temperature in the hydraulic unit to reach 70 °C (158 °F) if it
is used on a very hot day with ambient temperatures of over
40 °C (104 °F).
As a reference, it can be noted that a car engine normally
operates at 90 °C (195 °F).