Precautions During Use - jcb JS300 Service Manual

Installation
1 Precautions when installing the ram on the machine.
a When installing and removing from the machine,
suspend the ram safely.
b Suspending the ram by the piping is not only
dangerous, but can also cause damage to the
cylinder.
c Secure the piston rod with a band. It is very
dangerous if the rod extends unexpectedly. Also,
the rod can be damaged and become unusable.
2 Welding after installing the ram may result in damage.
a If electric welding is done even at a point away
from the ram, there may be sparking inside the
ram and it will become necessary to replace the
ram with a new one.
3 When painting the machine, mask the ram.
a If paint adheres to the rod surface or to the wiper
ring and the ram is operated, the wiper ring will not
function properly and foreign matter and paint can
easily enter the ram. This will cause damage to
the seals, drastically shortening the life of the ram.
4 Install the ram only when it is clean.
Caution During Use
1 Use only under designated conditions.
a If hydraulic oil other than the designated oil is
used, the seals quickly degenerate and become
damaged. If the relief valve is set at a value higher
than specified, it may cause ram damage and is
dangerous.
b In high temperature environments (approx. 90°C
and above) or low temperature environments
(below -20°C), seals quickly become damaged.
Special seal materials are necessary so check to
see if the ram that you are using is suitable or not.
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Precautions During Use

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Maintenance, Inspection Points
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Section E - Hydraulics
c The number one cause of ram oil leakage is rod
damage. Be careful not to damage the rod.
Warm up sufficiently before beginning work.
a In cold conditions the rod seals may be frozen, so
if the ram is operated at maximum pressure and
maximum speed, the seals will be damaged.
b There is a large amount of air in a new ram or one
which has been left for a long time, so the ram will
not operate smoothly. Also, if pressure is applied
suddenly without bleeding
temperatures will be generated due to adiabatic
compression and the seals may burn.
c Before beginning work, always move the ram at
full stroke with no load and expel air from the
cylinder.
When stopping or storing, do it at a safe and fixed
position.
a The installed ram cannot maintain the same
position for a long period of time, because the oil
inside the ram may leak and the hydraulic oil
volume decreases as it cools. Stop or store the
machine in a safe and fixed position.
Carry out daily maintenance and inspection.
a The key point for correct long-term ram function is
daily maintenance and inspection. Carry out
maintenance and inspection so that the ram
functions fully at all times. Always remove any
mud, water, dust or oil film adhering to the rod and
keep it in normal condition. However, when
cleaning the wiper ring and seals, do not get them
wet with water but wipe clean with a rag. To
prevent rust forming during storage, the amount of
exposed ram piston rod should be kept to a
minimum. If leaving for more than one week,
apply a light coating of suitable grease or
petroleum jelly to the exposed part of the ram
piston rod.
Use genuine JCB parts when replacing parts.
Hydraulic Rams
Precautions During Use
the air, high
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