Benefits of Preventive Mechanical Maintenance

Reactive Maintenance Is Burning Your Margin

A Thika packaging line called us after a gearbox seized at 2am. Cost: KES 2.1M in lost output, emergency air freight for a gear, and a missed supermarket delivery penalty. The root cause was a KES 3,200 bearing that a 30-minute vibration check would have caught 3 weeks earlier.

Reactive (fix after failure) costs 3–5× preventive in Kenyan plants we audit. Unplanned downtime averages KES 500k per hour on packaging and KES 1.2M on cement. Preventive is not a cost — it is margin protection.

What Preventive Actually Is

Not “grease and hope.” It is time- or usage-based work before failure:

Inspections: Daily walk-around (10 min), weekly detail (1h), monthly thorough (4h)

Cleaning & Lubrication: Correct grease type/amount — over-greasing kills bearings as fast as under

Calibration & Alignment: Laser alignment to ±0.05mm, belt tension, balancing

Replacement: Seals, belts, filters before MTBF

It sits between run-to-failure and predictive (vibration, thermography, oil analysis). Most Kenyan plants should start preventive, then layer predictive on critical (A) assets.

The Business Case — Numbers from Kenyan Plants

We tracked 47 lines across manufacturing, mining, and milling:

Uptime: 30–40% fewer unplanned stops (14% → 3% at Thika Cloth Mills in 4 weeks)

Life: 20–30% longer MTBF (bearings from 14 to 19 months)

Safety: 45% fewer breakdown-related near-misses (no midnight rush jobs)

Cost: 22% lower spares spend (planned bulk vs emergency DHL)

Compliance: Zero NCA observations on maintenance files vs 2.3 average before

ROI math: A line with 5% downtime (18 days/year) at KES 400k/day = KES 7.2M lost. A KES 85k/month contract (KES 1.02M/year) that cuts downtime to 3% (11 days) saves KES 2.8M — 2.7× return, before safety and life.

How to Build a Program in 30 Days

Week 1: Asset Registry & Criticality

List every asset. Rank A (line stops if it fails), B (slowdown), C (nuisance). Focus 80% of time on A. Example: For a maize mill, the hammer mill and sifter are A; the office AC is C.

Week 2: Tasks & Intervals

Pull OEM manuals + failure history. For each A asset, define tasks:

Hammer mill: daily amp check, weekly belt + screen, 250h bearing grease, 1000h oil analysis

Compressor: daily drain, weekly filter, 500h service

Week 3: Schedule in CMMS

We use a simple sheet or free CMMS (we set it up). Daily tick-boxes for operators, weekly for artisans, monthly for engineers. Each task has a photo guide — in Swahili where needed.

Week 4: Start & Measure

Kick off with toolbox talk. Track 3 KPIs on a whiteboard:

MTBF (hours between failures) — want up

MTTR (hours to repair) — want down

Availability = MTBF/(MTBF+MTTR) — target 98%+ on A

Layering Predictive (Month 2–3)

Vibration: Monthly on motors >15kW, gearboxes. Trend, don’t just threshold.

Thermography: Quarterly on MCC, bearings. Hot spot >20°C over ambient = act.

Oil analysis: For hydraulics and gearboxes — particles tell the story earlier than noise.

What It Looks Like at Dynatec

We don’t sell a binder and leave. For KES 85k/month per line (Thika, Ruiru, Nairobi metro):

1 site visit/week (2h) + 24/7 phone

Vibration + thermography quarterly

Spares kit (bearings, seals, belts) held in Ruiru, dispatched in 24h

Monthly report: MTBF, MTTR, next 30-day plan, spares used

Training: 2 operators on inspection, 1 artisan on alignment

Case: Kwale mining — 340t excavators availability 98.1% (was 91%) after 250h preventive + oil analysis. Breakdowns -40% in 90 days.

Common failure: Starting with C assets because they’re easy. Start with A — that’s where money is.

Next: Want the exact 30-day template (sheet + photo guides) we use? Download it via the OSHA checklist lead magnet at /blog/blog-workplace-safety, or book a free plant walk at /quote — we audit in 1 day and propose in 24h.

*Dynatec — 10+ years, 200+ lines, NCA 3, EBK. Call +254 143 293 534 for a plant walk.*