Servicing; General Servicing; High-Pressure Hose; Repairs At The Unit - WAGNER ProSpray 3.21 Mode D'emploi

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.
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The risk of damage rises with the age of the high-
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. 10,
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) from the pump
manifold (6).
4. Ensure that the seal (5) is seated correctly, then screw the
new valve housing (4) completely into the pump manifold (6).
Tighten securely with a wrench.
5. Align the cam base (3) with the hole in the pump manifold (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.
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5
7
3
4
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GB
11.2

Inlet and outlet valve

1. Remove the four screws in the front cover and then remove
the front cover.
2. Switch the unit ON and then OFF so that the piston rod is
positioned in the lower stroke position.
Danger of crushing - do not reach with the fingers or
tool between the moving parts.
3. Unplug the power plug from the outlet.
4. Remove the retaining clip from the connecting bend at the
suction hose and pull off the suction hose.
5. Screw off the return hose.
6. Swivel the unit 90° to the rear in order to work more easily on
the material feed pump.
7. Remove the pusher stem clip and slide the pusher stem
housing (7) from the inlet valve housing (1).
8. Unscrew the inlet valve housing (Fig. 11, Item 1) from the
pump manifold.
9. Remove the lower seal (2), lower ball guide (3), inlet valve ball
(4), inlet valve seat (5) and O-ring (6).
10. Clean all the parts with the corresponding cleaning agent.
Check the inlet valve housing (1), inlet valve seat (5) and inlet
valve ball (4) for wear and replace the parts if necessary. If the
worn inlet valve seat (5) is unused on one side, install it the
other way round.
11. Unscrew outlet valve housing (Fig. 12, Item 8) from the piston
(9) with adjusting wrench.
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12. Remove the upper ball cage (11), crush washer (10), outlet
valve ball (12), and outlet valve seat (13).
13. Clean all the parts with the corresponding cleaning agent.
Check outlet valve housing (8), outlet valve seat (13), outlet
valve ball (12), crush washer (10), and upper ball cage (11) for
wear and replace parts if necessary. If the worn outlet valve
seat (13) is unused on one side, install it the other way round.
14. Carry out installation in the reverse order. Lubricate O-ring
(Fig. 11, Item 6) with machine grease and ensure proper
seating in the inlet valve housing (Fig. 11, Item 1).
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Repairs at the unit
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3
4
5
6
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ProSpray 3.21