7-4 Disassembly and Repair
Pump rebuild
Disassembly
Figure 7.7 - Removing the Pump Actuator
Assembly.:
1 Pump Assembly
2 Shifter Fork
3 Screws
4 Actuator Assembly
Ygure 7.8 -
Cylinder Head Details.
Figure 7.9 -
Removimg the Piston
Assembly Components.
1. Remove the pump from the applicator. Refer to Pump replacement,
earlier in this section.
2. Lay the pump assembly (1) on a flat work surface.
3. Move the piston up or down until the shifter fork (2) is in the center of
the pump mount.
4. Use an 8 mm wrench to remove the screws (3) holding the actuator
assembly to the air cylinder.
.
5. Lift the assembly (4) up and set it aside.
6. Remove the clamping screw from the shifter fork. Slide the fork
towards the air motor and off the piston shaft.
7. Remove the cylinder head from the cylinder.
8. Check the o-ring on the cylinder head for damage. Replace if
necessary.
9. Remove the cylinder from the pump mount.
lO..Hold the piston shaft with a wrench on the flats. Remove the nut at
the top of the piston shaft.
11. Remove the two piston cup washers, the two piston cups and the
piston seal washer from the piston shaft.
12. Inspect the piston cups. Replace if they are cracked, creased or
otherwise damaged.
PM 106 701A
41.2300SP - Issued 1194
0 Nordson Corporation 1994
All Rights Reserved
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