The Core 12 (what to keep on hand)
Blades / Knives (case sealers, wrap cutters)
Why: Dull or nicked blades cause flagging, torn film, crooked seals.
Replace when: Tape “tails,” ragged cuts, film snags.
Qty: 5–10 per machine.
Wipe pads & rollers (tape heads)
Why: Glazed/contaminated pads = poor wipe pressure → seal lift.
Replace when: Visible glazing, tape build-up, uneven wipe.
Qty: 2 sets per sealer.
Tension / return springs (tape heads, flap folders, clamps)
Why: Weak springs = inconsistent cutting/folding.
Replace when: Loss of snap/return, uneven action.
Qty: 2–4 per mechanism.
Belts (conveyors, compression/drive, timing belts)
Why: Slipping or cracked belts cause mistracking, jams, mis-locks.
Replace when: Cracks, frays, glazing, frequent re-tension.
Qty: 1 full set per conveyor or mechanism.
Idler/guide rollers & bearings
Why: Flat spots or seized bearings = tracking issues, noise, heat.
Replace when: Wobble, heat, squeal, visible wear.
Qty: 2–4 spares of the common sizes.
Sensors / photoeyes (carton present, home, product detect)
Why: Bad reads stop lines, cause phantom jams.
Replace when: Intermittent reads after cleaning/alignment.
Qty: 1–2 universal or model-specific spares per line.
Airline repair kit (regulators, push-to-connect fittings, tubing)
Why: Small leaks → weak clamps/wipes → quality issues.
Replace when: Audible leaks, pressure won’t hold.
Qty: Assorted fittings + 10–20 ft common tubing.
Contact consumables (print/coder)
Why: Dirty/worn printheads and rollers smear/skip codes.
Replace when: Smearing after cleaning, worn edges.
Qty: 1 spare printhead (if applicable) + 1 roller kit.
Pre-stretch carriage parts (stretch wrappers)
Why: Worn pre-stretch rollers/bushings = tailing, film breaks.
Replace when: Scoring, roughness, seized bushings.
Qty: 1 roller kit + blade for Auto Film Cut.
Compression wheels/pads (Kwik-lock & folder mechanisms)
Why: Worn pads fail to seat locks fully.
Replace when: Glazing, rounding, inconsistent locks.
Qty: 1 set.
Fuses & relay set (electrical cabinet)
Why: Cheap insurance against nuisance faults.
Replace when: Blown fuse/relay fault confirmed.
Qty: 2–3 of each rating used on the line.
Fasteners & alignment shims (service pack)
Why: Vibration loosens mounts; shims re-square guides fast.
Replace when: Monthly PM discovers looseness/splay.
Qty: Small kit of the machine’s common sizes.