Hyundai Robex 22-7, Service Manual

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11-3 Assembly
11-3-1 Assembly procedure
1. The assembly procedure is the reverse of disassembly.
2. Before assembly, check whether metallic powder or other foreign matter is not sticking
to any of the parts and whether the parts can be reused.
3. Coat hydraulic oil on each part before assembling them.
4. Assemble beforehand the parts into the following assemblies.
• Cylinder tube assembly
• Rod cover assembly
• Piston rod
• Piston assembly
11-3-2 Inspection procedure
Clean each disassembled part with light oil or treated oil except for the packings.
Packings are cleaned with petroleum hydraulic oil.
Other types of oil will remarkably shorten the life of the packing.
Thoroughly clean the sliding surface, oil hole, O ring, packing groove, etc. If the part is
not used for a long time after being cleaned, execute a rust proof treatment.
(Coating hydraulic oil is effective for rust prevention to a certain degree.)
1. Check all parts for flaws, cracks, deformation, rust, or burrs which may affect the
operation. (Inside of the tube, rod, etc.)
2. Check each part for metallic powder or other foreign matter sticking to it.
3. Check the sliding surface of piston rod for damage, uneven abrasion, discoloring, or
any defect which may affect its operation.
4. Packings and seals are usually replaced with new one. If you must reuse them, check
that there are no tears, cuts or foreign matter sticking to the packing.
11-3-3 Precautions for assembly
Assemble the cylinder while paying attention to the following matters.
1. Replace the packings with new ones before assembly.
2. Execute assembly work paying attention to the direction of cushion bearings (boom,
arm, bucket and swing) and seal rings (arm and swing).
3. Replace the set bolts with new ones.
In assembling, after tightening the set bolts, further tighten and firmly fix them by hitting
with punch at two points on the periphery.
4. Tighten the rod cover, piston and nuts with a specified tightening torque shown in the
attached table (page 11-1).
5. Check fully before starting assembly work.
11-5