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Impact 440
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. Unscrew the inlet valve housing (Fig. 11, Item 1) from the
pump manifold.
8. Remove the lower seal (2), lower ball guide (3), inlet valve
ball (4), inlet valve seat (5) and O-ring (6).
9. 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.
2
3
4
5
6
1
10. Unscrew outlet valve housing (Fig. 12, Item 8) from the
piston (9) with adjusting wrench.
11. Remove the upper ball cage (11), crush washer (10), outlet
valve ball (12), and outlet valve seat (13).
12. 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.
13. 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).
repairs at the unit
9
11
10
12
13
8
21
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