Item No.	Description	Item No.	Description
1	Piston Rod	12	Piston
2	Rod Bearing	13	Cylinder Tube Seal
3	Wiper	14	Rear Head
4	O-ring	15	Tie Rod Nuts (4)
5	Bearing Plate	16	Tie Rods (4)
6	Backup Ring	17	Piston Retainer
7	Rod U Cup	18	Piston O-Ring
8	Front Head	19	Piston Seal Backup Ring
9	Cylinder Tube Seal	20	Piston Bearing Strip
10	Cylinder Tube	21	Piston Seal Backup Ring
11	Piston U-Cup
* Available as factory assembled only ** Available as rod seal kit only a Available as piston seal kit only

NOTE: Cylinder life is directly dependent on proper installation and air preparation.

Cylinders are not structural units and they are designed only to push and pull. The piston rod must be properly aligned with the mating part in both the extended and retracted position. Any misalignment will cause interference and shorten the cylinder life.

Air lines must be free of all contamination. An air line filter should be used. The air supply must be clean and free of moisture. Proper lubrication is also recommended.

When rebuilding cylinders, make sure all parts are clean before reassembly and avoid introducing any dirt or chips into the cylinder. Check the piston rod (1) and the cylinder tube (10) for damage and replace either if necessary before proceeding. Pre-lubrication of all seals prior to re-assembly is recommended for ease of installation.

To Replace the Rod Seals
Remove any rod clevis or jam nut from the piston rod (1). Using a spanner wrench or other appropriate tool unscrew the bearing (2) and slide it over the piston rod. Insert a new backup ring (6), rod seal U-cup (7), and wiper (3) into the new bearing (2).

IMPORTANT: The backup ring must be installed in the groove before the U-cup, and install the U-cup with the lips facing the piston.

Install the new bearing assembly over the piston rod, taking care in passing it over the threaded part of the rod. Retighten the bearing firmly.

NOTE: If the bearing is difficult to remove, loosen the tie rods slightly on the cylinder. This will take pressure off the bearing plate (5) and should allow easier disassembly. If the tie rods are loosened, re-torque them afterward to the values shown in the chart below.

To Replace the Piston Seals
Remove the front head (8) by unscrewing four tie rod nuts (15) and lifting the front head off the cylinder tube (10). Remove the piston rod/cylinder tube assembly from the rear head (14) and pull the piston rod assembly from the rear head (14). Then pull the piston rod assembly out of the tube. Remove the piston U-cups (11), their backup rings (19 & 21), and the bearing strip (20).

IMPORTANT: Install new U-cups and backup rings, making sure that the lips of the seals face away from each other, and that the backup rings are behind the U-cups.

Use grease to hold the new bearing strip in place, and insert the piston rod assembly back into the cylinder tube.

NOTE: It may be necessary to temporarily compress the first piston U-cup to allow it to enter the tube. Make sure the bearing strip is not pinched between the tube and piston.

Install new cylinder tube seals (9 & 13) into the heads, and reinstall the cylinder tube. This is best done in the vertical position, with the blind end cover down. Make sure the tie rod assembles through the tie rod holes in the heads. Retighten the tie rods using equal torque per the chart below.

Bore Size	Torque
1 1/2"	8-10 ft.lbs.
2", 2 1/2"	15-20 ft.lbs.
3 1/4", 4"	30-35 ft.lbs.
5", 6"	70-75 ft.lbs.