What Causes Poor Vacuum Performance — Is It the Machine or theBag?

Troubleshooting weak vacuum is a systematic process. Here is how to accurately diagnose the root cause before calling for
service or replacing equipment:
Diagnostic Decision Tree:
Step 1 — Run a blank cycle (no bag, lid closed).
Gauge reaches ≥ -90 kPa → pump and chamber are fine → go to Step 2
Gauge stops below -70 kPa → machine-side issue → go to Step 3
Step 2 — Run with a new, undamaged bag from a known-good batch.
Vacuum holds → original bag was defective (micro-puncture, wrong material, poor barrier)
Vacuum still poor → check bag placement and sealing bar alignment
Step 3 — Machine-side diagnosis：

The #1 Overlooked Cause: Pump oil. Rotary vane vacuum pumps require oil changes every 500–800 operating hours
(approximately every 3 months in single-shift production). Old, contaminated oil dramatically reduces ultimate vacuum and
accelerates wear. This is the most common cause of gradual performance degradation that operators mistake for “the machine
getting old.”
YGPACK Service Advantage: Every YGPACK machine ships with a first-fill pump oil kit and a maintenance log card. Our
technical support team provides remote diagnostic assistance — including guided gauge testing — before any service ticket is
escalated.