Scotchman Porta-Fab 45, Manual

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Page 52
8.3 CYLINDER SEAL REPLACEMENT
Use the following steps to replace the seals in the hydraulic cylinder:
SEE FIGURE 22 ON THE FOLLOWING PAGE.
1. With the arm up, turn the machine’s power OFF.
2. Block the arm up on the tool table. SEE ITEM (A).
3. Remove the hoses from the cylinder and allow the fluid to drain.
4. Remove the cylinder clevis pin (B) and swing the cylinder out away from the arm.
5. Remove the retaining ring (C) from the top of the cylinder.
6. Tap the head down into the tube and remove the second ring (D).
7. Place the pin (B) through the clevis and pull the cylinder apart, using a come-along or similar
device.
8. Remove the locking nut from the end of the shaft and slide the piston and head off of the shaft.
9. Replace all of the seals. There will be extra seals in the kit. Match the replacement seals with the
old ones and discard the rest.
10. Clean all parts, including the inside of the tube, and check all parts for nicks or scratches.
11. Oil all of the seals before reassembling the cylinder.
12. After the head and piston are assembled on the shaft, torque the locking nut to 100 foot pounds.
13. Tap the shaft assembly back into the tube, using a brass or plastic hammer and then, install the
ring (D)..
14. Tap the head into the tube and install the retaining ring (C).
15. Replace the cylinder clevis pin (B) and connect the hoses to the cylinder.
16. Use care when removing the block (A). The cylinder does not have fluid in it and the arms may
drop some when the block is removed.
17. Cycle the machine several times before performing any work.