How often should a Large Protective Case seal be replaced?

Answer: By cycles and permanent set, typically three years or 5,000 lid cycles. Below 12.6 mm after a 30 minute rest, it is due.

Can a noisy axle be fixed with grease alone?

Answer: No. Noise means play past 1.2 mm and a worn race; grease only hides it while the housing wears oval.

Is the yearly proof load worth it?

Answer: Yes. Clamp load can fall 15 percent in a year; a 10 minute hold at 1.25 times rating exposes it.

Does a 1.0 mm stack set mean scrap?

Answer: No, drop it to single-layer duty. A deformed rim cuts compression to about 13 percent.

Can the body be cleaned with a pressure washer?

Answer: Yes, at 300 mm and under 80 bar, then dry the seal groove.

Can a torn seal be glued?

Answer: For one trip, yes. The joint squeezes open, so replace the run before deployment.

Large Protective Case Service: 6-Month Checks, 14 mm Seals

Quick answer: Service a Large Protective Case by counters, not the calendar. Replace the 14 mm seal when set passes 2 mm or hardness hits 78 Shore A; read axle play every 500 km, proof-load lift points yearly, and drop a stack layer at a 1.0 mm rim set.

Inspection Rhythm for a Large Protective Case
Seal Compression: A 14 mm Profile and Two Replacement Lines
Wheel Axles and Lift Points: Two Loaded Parts
Judging Stack Deformation
Stretch the Service Life: Washing, Storage, Spares
FAQ

1. Inspection Rhythm for a Large Protective Case

Three counters set the schedule for a Large Protective Case: lid cycles, transport kilometres, humidity of the store. Indoors for three years the seals stay soft; two years on a truck and the axles go first.

Past one metre and 18 kg empty, the lid doubles hinge load for one person, so tighten the schedule.

Item	Interval	Limit	Action
Seal surface	3 months	no cracks or glazed skin	replace the run
Compression	12 months	9.8 mm left when latched	adjust or reseal
Axle end play	6 months or 500 km	1.2 mm maximum	new bearing
Wheel wear	6 months	118 mm minimum	new wheel set
Lift points	before every lift	no whitening or bulges	out of service

Twelve months is the longest gap; axles sit at six because wear speeds up after 500 km, taking another 0.3 mm of tread every 100 km.

2. Seal Compression: A 14 mm Profile and Two Replacement Lines

Most Large Protective Case bodies take an EPDM hollow seal, 14 mm tall, in a 4.5 mm groove. At 30 percent compression it stands 9.8 mm; under 8.4 mm the groove is shallow or the bulb has collapsed.

Large Protective Case: the same blue case on a white table, long handle and lid rim up, fingers at the top corner, rounded edges

Two lines force replacement: a profile recovering to under 12.6 mm after a 30 minute rest has lost a tenth of its elasticity, and Shore A climbing from 65 to 78 means it cracks at minus ten degrees. Either one means a full run, never a splice.

Dust, salt and grease build a film that speeds plasticiser loss, so wipe every three months with a neutral cleaner at pH 6 to 8 and water under 40 degrees Celsius. Acetone, thinner and alcohol above 75 percent strip the anti-ageing layer and craze the surface within six months. Finish with silicone grease at 0.2 g per metre to block ozone; in coastal air halve the interval, and in storage leave the lid open 5 mm.

3. Wheel Axles and Lift Points: Two Loaded Parts

The first parts to fail are the axles and lift points, both metal cast into plastic with almost no warning.

Part	Spec	Interval	Limit
Axle	125 mm wheel, 8 mm 304 shaft, 2RS bearings	6 months or 500 km	1.2 mm play, new wheel at 118 mm
Housing	M8 bolts	6 months	12 N·m, no white ring in the counterbore
Lift points	M12 inserts	before every lift	no whitening, crack or bulge
Proof load	1.25 times rating	12 months	10 minutes, 53 kg on a 42 kg body
Retorque	lift bolts	12 months	25 N·m, never past 30 N·m

A body lifted 22 times a year has pushed its inserts through 22 cycles, which is when the proof load cannot be skipped.

Lift points are not tie-downs: side pull creeps a bell mouth into the plastic within six months.

4. Judging Stack Deformation

Two loaded units put upper weight on the lower rim for 30 days, and polyolefin creeps visibly above 40 degrees Celsius, the temperature of a top rack in summer.

Large Protective Case: a blue case lying open and empty, curved handle cutout in the lid, a hinge row between halves, white foam board behind

A 500 mm straight edge with a 0.1 mm feeler settles it: slip under at 1.0 mm and the set is permanent. Base diagonals 2 mm apart mean the frame is out of square.

Past 1.0 mm it will not spring back, it only stacks lower.

A 12 mm plywood pallet spreads the load; on bare concrete the corners sink 0.8 mm in 30 days. Empty bodies stack three high, loaded ones two, with base bosses 3 mm inside the lid recess.

5. Stretch the Service Life: Washing, Storage, Spares

A Large Protective Case is rated for eight years if it is washed, stored and repaired correctly.

Washing: neutral cleaner, water under 40 degrees Celsius, pH 6 to 8; pressure washer 300 mm away, under 80 bar.
Storage: 5 to 35 degrees Celsius, under 70 percent humidity, 100 mm off the floor.
Hardware: 304 pins, no red rust after 96 hours of salt spray.
Spares: hold 5 percent of seal runs, wheel sets and latches.

Order from the same batch: 1 mm of seal height changes compression by 7 percent, and a seal that looks seated still leaks.

Conclusion

Wipe the seal every three months, read the axle every 500 km, hang 53 kg once a year, measure the base corners at every intake. Do those four and eight years is delivered, not claimed. Keep the schedule on the body and a Large Protective Case will not leak by year three.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.