This document provides the technical basis for approving lubricant selection and controlled changeover in manufacturing and assembly plant hydraulic systems. It is intended for engineering, maintenance and procurement teams operating within structured approval and audit environments.
Equipment covered
- Machine tools and CNC equipment
- Presses and forming machinery
- Assembly line hydraulic systems
- Material handling and positioning equipment
Operating environment considerations
- Continuous or near-continuous duty cycles
- Precision control requirements
- Thermal load from extended operation
- Low tolerance for process variation or downtime
Hydraulic oil selection basis
Manufacturing hydraulic systems require stable viscosity, consistent antiwear performance and oxidation resistance under continuous operation. Oils meeting ISO 11158 L-HM and DIN 51524 Part 2 are commonly specified for these applications.
Viscosity grade selection
| System condition | Typical selection | Technical rationale |
|---|---|---|
| High precision or servo-controlled systems | ISO VG 32 | Supports fast response and stable control accuracy |
| General manufacturing hydraulics | ISO VG 46 | Balanced viscosity for wear protection and thermal stability |
| High load or elevated operating temperatures | ISO VG 68 | Improved film strength under sustained thermal stress |
Equivalency statement for internal approval
Hydraulic oils meeting ISO 11158 L-HM or DIN 51524 Part 2 are technically suitable for manufacturing and assembly plant hydraulic systems when viscosity grades are selected in line with equipment manufacturer guidance.
Changeover guidance
- Changeover should be completed during planned maintenance windows
- No flushing is normally required when replacing oils of the same specification category
- System cleanliness and filtration practices should be maintained
Expected outcome
- Stable hydraulic response and process consistency
- Maintained component protection under continuous operation
- No increase in operational risk when applied correctly
Technical use notice
Technical use notice
This guidance supports specification alignment. Final lubricant selection must follow equipment manufacturer requirements, operating conditions and site maintenance practices.