AVR AVK Series Installation, Operation And Maintenance Manual - Page 9

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9.3. Seal renewal

1. Remove the piston assembly

2. Remove piston seal ring (14)

3. Clean and lubricate seal groove (15)

4. Check seal ring for cracks or damage, replace if necessary

5. Install seal ring

6. Remove bottom nut (20)

7. Take apart valve guide (19), piston (5) and main seal (18)

8. Check main seal for cracks or damage, replace if necessary

9. Refit seal and assemble the parts

10. Lubricate inner cylinder and piston seal ring with suitable lubricant

11. Reinstall piston assembly with new split pins

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