October 2008 "3072ES / 3772ES / 3772ES HD" Service & Parts Manual
Page 1-18
Preparation
Take care not to damage rod surface and guard against dirt or other foreign
objects entering system.
1. Drain all fluid from cylinder.
2. Clean all dirt and grit from outside of cylinder.
3. Insert cylinder into vise.
Cylinder Disassembly
1. Remove the head from the cylinder body.
2. Remove the shaft assembly from the barrel, pulling in a straight line, so as not to scar the
internal parts.
3. Insert shaft into a soft jawed vise so that the head and piston can be removed. Be sure the
shaft and vise are both clean before using.
4. Remove nut at the end of the shaft and pull head and piston off of the rod.
5. Remove all seals from the head and piston using a non-sharp seal tool. These tools are
available from various seal suppliers.
9. Clean all fluid and debris off of the head, piston, shaft, collar and barrel using solvent, rags,
and an air hose.
10. Inspect parts for scratches, pits or polishing. Check seal groves and sealing surfaces.
• Scratches or pits deep enough to catch the fingernail are unacceptable; replace the
cylinder.
• Polishing is a sign of uneven loading. Check for roundness. If a polished surface is not
round within .007 inch (0.18 mm) replace the cylinder.
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