Improper storage of air and hydraulic cylinders can lead to premature failure of
the seals and other wear items.
When a cylinder leaves our factory, it has been pressure tested and then sealed
ensure that contaminants do not enter the cylinder ports. The rod thread is also
protected against accidental contact damage. The cylinder’s ins only of value if
it remains in its protected state prior to being used.
The following guidelines should be used for storage and handling of cylinders
prior to being installed on machinery.
1. Do ensure that port plugs remain secured in the ports until just prior to
being connected the fluid source. Any contamination that enters the cylinder
will cause premature wear resulting in shortened life.
2. Do keep rod threads protected from impact damage by either pre-installing
clevises or putting a protective sleeve over the threads. The sleeve can be
cardboard tube or old hose ends. The rods should be fully retracted during
storage to avid damage.
3. Do tag spare cylinders with machine center information so they can be
4. Do leave room for cylinders on shelves so they are not crowded. Cylinder
heaped on each other will pull out the port plugs and damage other key
components or labels, pins and grease fittings.
5. Do store cylinder in ready-to-use state which mean all pins, clevises,
grease fittings, retainers et car wired together and connect with the
cylinders so they cannot be separated.
6. Do store heavier cylinders on the lower or bottom shelves to reduce
personal strain when handling.
7. Store cylinders with rods retracted for maximum protection.
1. Do not store cylinders outside for any length of time. Exposed surfaces
including the chrome rods can rust quickly and will cause rapid failure of
seals and bushings.
2. Do not spray rods or cylinders with CRC, WD40 or other water displacement
chemicals. Theses chemicals cause the urethane seals to swell thus leading
to premature seal failure or cylinder jamming. Use a proper soluble wax rust
preventer if required. A light mineral oil can be used to coat the inside
for cylinders that will be stored longer than 6 months.
3. Do not dismantle cylinders in stores to salvage spare parts. The spare
cylinder at this point is useless although it may appear to be intact and
functional. Tie rod tension may be in correct which may result in cylinder
failure of persona injury in the event of a tie rod failure or cylinder
Port plugs and proper storage.
NPT push in style and SAE thread in style plugs are shown below.