HYDRAULICS 1.120 3. Support cylinder on ‘V’ blocks; make sure that when the piston is removed the components are not damaged. 4. Lubricate seals and wiper ring with clean hydraulic oil before and during assembly. 5. Make sure that the wire clip (1) is locking the gland nut (2) to the cylinder (3). If compressed air is used to extend the piston assembly, the gland nut (2) must not be removed. Release all pressure before the gland nut is removed. 4. When the piston assembly is difficult to extend, a compressed air supply may be used to pressurize the cylinder. Use only the minimum pressure necessary to extend piston. 5. Remove the wire clip (1) securing the gland nut (2) from the cylinder (3).
6. Using a suitable peg spanner, unscrew the gland nut (2) from the cylinder (3). 7. Withdraw the piston rod (4) complete with piston and gland assembly from the cylinder (3). If necessary, fit an attachment pin into the piston rod and carefully tap the pin with a soft faced hammer to remove piston rod. 1. Wire clip 2. Gland nut 3. Cylinder 4. Piston rod 5. Piston 6. Piston guide ring 7. Seal 8. Snap ring 9. Dual-seal ring 10. Lip seal 11. Wiper ring 12. Union 13. Pressure reducing valve 14. Bolt 15. Washer 16. Cylinder hose 8. Unscrew the piston (5) from the piston rod (4). 9. Remove the piston guide ring (6) from the piston (5).
Remove and discard the piston seal (7) and snap ring (8) from the piston. 10. Remove and discard the dual-seal ring (9), lip seal (10) and wiper ring (11) from the gland nut (2). 11. Unscrew the union (12) attaching the pressure reducing valve (13) to the cylinder connection. Remove the bolt (14) and three washers (15) securing the cylinder hose (16) to the valve (13) and remove the valve. Assembly 1. Assemble the carriage locking cylinder in the reverse order to dismantling. 2. Use new seals and wiper ring during assembly. 3. Make sure all old Loctite is removed from the threads of the piston and piston rod before assembly.
Apply Loctite sealant to threads of piston rod and securely screw piston to piston rod.