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Buying a used servo press can deliver excellent value, but requires careful inspection. Here is what to check before committing.
## Documentation Check
Request: maintenance records, fault history log, original commissioning report, and any repair records. A well-documented press is a well-maintained press. Missing records are a red flag.
## Physical Inspection
**Frame and structure:**
- Inspect for cracks, especially at stress concentration points (corners, holes)
- Check for evidence of overload — deformed frame members
- Verify all safety guards are present and intact
**Slide and gibs:**
- Measure slide parallelism — should be within 2x original specification
- Check gib clearance — excessive clearance indicates wear
- Look for scoring or galling on gib surfaces
**Main bearings:**
- Run the press and listen for bearing noise
- Check for excessive play with dial indicator
- Ask for vibration analysis records
## Electrical and Controls
- Power on and check for fault codes — clear all faults and see what returns
- Verify servo drive model and firmware version — check if parts are still available
- Test all I/O: sensors, safety circuits, E-stops
- Check HMI for error history
## Servo System
- Run at slow speed and check for smooth motion
- Check encoder feedback — position should be stable with no jitter
- Verify motor temperature after 30 minutes of operation
- Request servo drive parameter printout
## Test Run
Always run the press with a test die before purchase. Check:
- Slide position repeatability (measure 10 consecutive strokes)
- Load curve consistency
- Noise and vibration levels
- Cycle rate at rated speed
## Price Negotiation
Factor in: cost of any repairs needed, cost of spare parts for aging components, and cost of re-commissioning. A press needing in work is worth less.