Storch Airless ST 550 Mode D'emploi page 237

Repairs
In order to damage to persons, please read all warning
notice in this operating manual before performing repair
work.
Replace needle
1. Perform the pressure relief procedure, actuate the trig-
ger lock.
2. Remove the hose and tip guard.
3. Disengage gun safety latch and squeeze the gun trig-
ger.
4. Remove needle seat (1a).
5. Remove the counter nut and end cap.
6. Knock the needle out to the front using a plastic ham-
mer.
7. Clean the gun's internal channels with a soft brush.
8. Lubricate o-rings of new needle with silicon-free gre-
ase.
9. Insert the new needle with the thread first into the
spray gun from the front.
10. Attach the counter nut and end cap loosely.
11. Apply a medium-strength (blue) sealant to the thread
on the needle seat.
12. Pull the trigger when installing the needle housing.
Apply a torque of 35 - 43 Nm.
13. Perform needle adjustment.
Needle adjustment
1. Follow pressure relief procedure and secure gun trigger.
2. Remove tip, tip guard and hose.
3. Hold the gun so that the tip is pointing upwards. Turn
the retaining nut clockwise until the trigger is visible and
visibly lifts a little.
4. Turn the retaining nut 3/4 of a turn anticlockwise. If
adjusted correctly, the trigger is freely movable.
NOTE:
The needle is adjust correctly if the trigger is freely mova-
ble.
6. Attach the hose. Install tip guard. Vent sprayer.
7. Aim the gun into the pail and trigger until the spray flu-
id flows out of the gun.
8. Release the trigger. The fluid flow should stop imme-
diately.
9. Lock gun safety latch. Try to trigger the gun. No fluid
should escape now.
10. If the gun does not pass the test, repeat steps 1 - 9
after adjusting the needle.
237 Original instruction