1. March 19, 2013 4” Leg Valve Changeout

2. Required Tools and Materials 3” Wrench 9/16” Wrench 11/16 Wrench Seal Pick Clean hydraulic fluid

3. Old Valve Removal Remove hydraulic lines Remove fittings if necessary Relieve pressure by carefully loosening check valve cartridges Use a suitable wrench to remove valve body by rotating counter clockwise Note: fluid loss is minimized if valve removal is done with the leg in a vertical position

4. Replace Seals Clean Rod end Carefully remove old o-rings and backups Be careful not to scratch sealing surfaces Install new o-rings and backups

5. New Dual Counterbalance Valve Body Remove new valve from packaging Lightly lubricate rod seals and inside of valve body with clean hydraulic oil

6. Install New Valve Body Install new valve body on rod and hand tighten On legs with mounting plates that extend above the leg one or more of the cartridges may need to be removed and reinstalled. Torque to 12-15 FT- LBS (144-180 IN-LBS).

7. Tighten Valve Body Using a suitable wrench tighten Valve Body to Rod until fully seated Torque approximately 100 ft*lbs

8. Adjust Port Orientation If necessary adjust port orientation Loosen screw on front of leg with 9/16” wrench Rotate valve body to desired orientation Retighten screw on front of leg Ensure that the screw locates between the gear teeth Reattach fittings and hoses

9. Do not adjust valve Cartridges are preset to 3500 psi Hex contains tamper evident sealing material