172
OMAHA STANDARD
CYLINDER REBUILD PROCEDURE
REPALCEMENT OF SEALS (SEE FIGURE 4)
CAUTION: ONLY AN AUTHORIZED DEALER OR SKILLED PROFESSIONAL
FAMILAIAR WITH HYDRAULIC PRODUCTS SHOULD ATTEMPT CYLINDER
REBULD. CALL FACTORY BEFORE ATTEMPING REPAIR.
WARNING: PROP OR BRACE BODY BEFORE SERVICING HOIST OR
WORKING UNDER BODY!
CAUTION! DO NOT USE SAFETY PROP TO SUPPORT A LOADED BODY
1. The cylinder should be disassembled in a clean environment to prevent dirt or other
contamination from entering the interior of the cylinder. Clean any accumulated dirt or debris
from the port openings an rod guide area. Remove the port plugs and drain any oil from the
cylinder. Do no reinstall the port plugs at this time. No special tools are required for
disassembly. Items that should be at hand are a vise, flat punch hammer, clean oil, clean paper
towels or shop towels and wrenches for removal of the guide retaining capscrews and the
piston nut.
2. Remove the two rod guide retaining capscrews that are installed in the face of the rod guide.
3. After removing the guide retaining capscrews, secure the cylinder in a vise at about the
mid-point of the wall. Do not excessively tighten vise on wall or it will be difficult to pull
piston past deflected area of wall. Place the punch on the face of the rod guide and gently tap
on the punch with the hammer to drive the rod guide into cylinder bore. Drive the rod guide
inside the bore until the groove in wall. A screwdriver can be used to lift the retaining ring out
of the groove also. Be very careful to not scratch any part of the cylinder bore as a scratch may
damage the piston seal on assembly.
4. Pull the rod vigorously outward and allow the piston to bump the rod guide. If there is high
resistance to piston movement in the area of the vise jaws, the vise is probably too tight. The
momentum of the rod should be sufficient to pull the rod guide and piston from cylinder barrel.
Be careful to not mar the chromed surface of the rod. NOTE: the piston seal and the rod guide
static seal will likely be cut by the edge of the retaining ring groove on removal from the
barrel. This is normal and cannot be avoided on disassemble.
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