Hyundai — Control Valve Assembly
A Hyundai service procedure — check it applies to your exact model before use.
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Before you start
- Always repair parts that were scored at disassembly
- Mixing of foreign matter will cause malfunction. Wash parts well with cleaning oil, let them dry with jet air and handle them in clean place
- Always tighten bolts, plugs, etc. to their specified torques
- Do not fail to coat sliding surfaces with clean hydraulic oil before assembly
- Replace seals such as O-ring with new ones as a rule
Procedure
- Put compensating rod into compensating hole of casing.
- Put pin force-fitted in lever into groove of compensating rod and fit lever to pin force-fitted in casing.
- Fit spool and sleeve into hole in spool of casing.
- Confirm that spool and sleeve slide smoothly in casing without binding.
- Fit return spring and spring seat into spool hole and attach snap ring.
- Fit fulcrum plug so that pin force-fitted in fulcrum plug can be put into pin hole of lever. Then fix locking ring.
- Insert adjusting plug and fit locking ring.
- For assembly, reverse disassembly procedures.
Source: manual:Hyundai_excavator_Service_manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.