3-137.9. DIRECTIONAL CONTROL VALVE - MAINTENANCE INSTRUCTIONS
All parts must be thoroughly cleaned and kept clean during inspection and assembly. Contamination in
the unit will cause excessive wear, leakage and decreased service life. Clean in accordance with
standard procedures for hydraulic arts. Do not use compressed air to dry parts unless the air is
completely filtered in order to remove water and contaminants.
Coat all internal parts lightly with lubricating oil.
Reassemble and insert into