Servicing; General Servicing; High-Pressure Hose; Repairs At The Unit - WAGNER ProSpray 3.21 Original Operating Manual

Servicing

10. Servicing
10.1

general servicing

Servicing of the unit should be carried out once annually by the
WAGNER service.
1. Check high-pressure hoses, device connecting line and plug
for damage.
2. Check the inlet valve, outlet valve and filter for wear.
10.2

High-pressure hose

Inspect the high-pressure hose visually for any notches or bulges, in
particular at the transition in the fittings. It must be possible to turn
the union nuts freely.
The risk of damage rises with the age of the high-
i
pressure hose. Wagner recommends replacing high-
pressure hoses after 6 years.
11.

Repairs at the unit

Switch the unit oFF.
Before all repair work: unplug the power plug from
the outlet.
11.1

Relief valve

1. Use a drift punch of 2 mm to remove the grooved pin (Fig. 11,
Item 1) from the relief valve handle (2).
2. Remove the relief valve handle (2) and cam base (3).
3. Using a wrench, remove the valve housing (4).
4. Ensure that the seal (5) is seated correctly, then screw the new
valve housing (4) completely into the filter block (6). Tighten
securely with a wrench.
5. Align the cam base (3) with the hole in the filter block (6).
Lubricate the cam base with grease and slide on the cam base.
6. Bring the hole in the valve shaft (7) and in the relief valve
handle (2) into alignment.
7. Insert the grooved pin (1) to secure the relief valve handle in
position.
5
4
3
2
1
7
GB
11.2

Inlet and outlet valve

1. Remove the four screws in the front cover and then remove
the front cover.
Danger of crushing - do not reach with the fingers or
tool between the moving parts.
2. Turn the pressure control knob to minimum pressure. The
DESC screen should say "PRIME".
3. Press the #1 key on the DESC control panel. The "CREEP
MODE" screen will now appear.
4. Slowly turn the pressure control knob clockwise to increase
the pressure. The crankshaft/slider assembly will begin to
move very slowly.
5. When it reaches the bottom, dead-center of its stroke, turn
the pressure control knob back to minimum pressure. The
crankshaft/slider assembly should stop.
6. Unplug the power plug from the outlet.
7. Pull off clamp on suction tube and remove return hose.
8. Unscrew the connection hose (Fig. 12, item 1) from the high-
pressure filter.
9. Turn the knob on the side of the cart clockwise to unlock the
cart. Tilt the cart backwards until it locks into place.
10. Loosen and unscrew inlet valve housing (2) from the lower
housing (3) with light blows from a hammer or unscrew with
an adjusting wrench.
11. Remove bearing ring (4), O-ring (5), O-ring (6), inlet valve seat
(7), inlet valve ball (8) and upper ball guide (9).
12. Clean all the parts with the corresponding cleaning agent.
Check the inlet valve housing (2), inlet valve seat (7) and inlet
valve ball (8) for wear and replace the parts if necessary. If the
worn inlet valve seat (7) is unused on one side, install it the
other way around.
13. Carry out installation in the reverse order.
Lubricate O-ring (5) with machine grease and ensure proper
seating in the inlet valve housing (2).
6
16
1
3
9
8
7
6
5
4
2
Repairs at the unit
ProSpray 3.29 • 3.31