TL;DR
Slow ram speed on the Aida NC1 usually means worn hydraulic pump output or a pressure relief set too low. Measure pump flow and compare to spec before assuming any single cause.
What you might see
- ram descends slower than programmed
- cycle time longer than baseline
- hydraulic pressure gauge reads low
- pump noise elevated under load
Likely causes
Worn hydraulic pump producing low flow at rated speed
Relief valve pressure setting drifted below specification
Clogged hydraulic filter restricting supply flow
Internal valve spool wear causing bypass and flow loss
Required tools
- Calibrated hydraulic flow meter
- Hydraulic pressure gauge
- LOTO kit
- Die block (press-specific)
- Replacement hydraulic filter element
- Torque wrench
Safety first
- Always insert the die block and engage the Emergency Stop before working inside the press stroke area. Stored mechanical energy in the flywheel can cause an unexpected stroke.
- Bleed hydraulic pressure to zero before opening any hydraulic fitting or port. Hydraulic injection injuries are life-threatening.
- Lock out and tag out both the electrical main disconnect and the hydraulic pressure isolation valve before performing any maintenance.
Procedure
- 1
Press the Emergency Stop and engage the die block before entering the press work area.
- 2
Lock out and tag out the main power disconnect and the hydraulic pressure source.
- 3
Check the hydraulic reservoir fluid level. Low fluid causes pump cavitation and reduced flow.
- 4
Inspect the hydraulic filter element condition indicator. Replace the filter if the indicator shows restriction.[1]
- 5
With the system de-energized and pressure bled, remove the pump outlet gauge port plug and install a calibrated flow meter.
- 6
Re-energize under controlled conditions and measure pump output flow at rated speed. Compare to Aida NC1 spec.[1]
- 7
If pump flow is more than 10% below spec, schedule pump replacement. Worn pump internals cannot be field-repaired.
- 8
Check the main relief valve setting with a pressure gauge. Adjust to the Aida-specified pressure only if measured pressure is out of range.
- 9
Replace hydraulic fluid and filter after any pump or valve work, metallic debris from worn components contaminates the system.
Sources
Aida NC1 Mechanical Servo Press Operation Manual, Aida Engineering
Aida NC1 Mechanical Press Operation Manual, hydraulic system maintenance procedures (general)
View source
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