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Prediction Report

Ticket #JOB-1 · July 9, 2026 · Predicted
✕
Submitted inputs · July 9, 2026 · 5:27 PM
Nameplate
hp: 100
rpm: 1780
frame: 405T
voltage: 460
phase: 3
fla: 124
Symptoms
Noise character?: speed-proportional grind/rumble
Can you turn the shaft by hand, uncoupled?: rough/notchy
Tests
Insulation resistance: 500.0 MΩ
Surge: pass
Bearing RTD: 96.0 °C
Vibration: bearing_defect_freq
Running current/phase: [110.0, 111.0, 110.0] A
Vibration velocity RMS: 11.0 mm/s
Bearing defect freq: BPFO 142 Hz
Lubrication: dry no grease
Notes
pump motor, DE grinding 2 weeks, bearing hot, normal current
✓ PredictableConfidence 99/100 · High
Executive summary
Signs point to a lubrication-starved drive-end bearing failure (BPFO outer-race defect). Take out of service and inspect/replace bearings before continued running seizes the bearing and damages the shaft/rotor.
Est. cost · internal
$2,700
Labor
16 hrs
Turnaround
2 business days
Repair vs. replace
Repair — strongly favored at this size (replacement cost & lead time)
Likely failure mode
Highouter-race bearing failure, lube starvation
MediumShaft misalignment (or unbalance from the coupled pump) is the primary driver, with bearing damage as a downstream symptom rather than root cause
Lowmechanical looseness / bearing housing wear
Required repairs
• Replace drive-end and opposite-drive-end bearings (pending teardown confirmation)
• Clean and re-lubricate per spec; verify grease type/quantity
• Inspect/machine shaft journal and bearing housing fits if scored (pending teardown)
• Verify coupling alignment on reinstall
Material staging
DE bearing ×1 · ~2d lead
95% likelyorder before teardown
ODE bearing ×1 · ~2d lead
90% likelyorder before teardown
Bearing seals ×set · ~1d lead
85% likelycheck stock
Grease (per spec) ×as req
95% likelycheck stock
Shaft sleeve ×1 · ~2d lead
35% likelyorder before teardown
Labor — 16 hrs total
Teardown
4 h
Replace bearings
4.8 h
Clean & inspect
2.4 h
Reassemble
3.2 h
Run test
1.6 h
Reinstall & coverage
• Reinstall & laser alignment on site — field service, quoted separately
• 12-month workmanship warranty — carried in the estimate
• Preventive maintenance plan — optional add-on
Sharpen estimate
Add evidence to tighten the estimate and raise confidence:
• Photo of the bearing / shaft end — race and shaft condition confirm the mode and whether a sleeve is needed
• Vibration FFT spectrum (harmonics of BPFO vs 1x/2x RPM) — reduces remaining uncertainty in the scope
• Coupling alignment measurement — reduces remaining uncertainty in the scope
All key tests are in — add photos or notes if you have them.
Confirmed outcome
Reasoning
outer-race bearing failure, lube starvation — tests: vibration dominant = bearing_defect_freq, BPFO 142 Hz; tests: bearing RTD 96 C (hot)
Shaft misalignment (or unbalance from the coupled pump) is the primary driver, with bearing damage as a downstream symptom rather than root cause — QUESTION: noise is speed-proportional grind/rumble — consistent with alignment/coupling-driven forcing at running speed; PHYSICS: vibration velocity 11 mm/s in ISO zone C/D — classic misalignment magnitude, not exclusive to bearing defect
mechanical looseness / bearing housing wear — physics: high vibration velocity; advanced bearing damage can loosen fit
rotor/electromagnetic fault
Multiple independent hard signals (bearing-defect frequency, high vibration, 96 C RTD, dry grease, tactile roughness) corroborate; main residual uncertainty is misalignment as root cause, not the bearing diagnosis itself.