Yale RPYS-1215 Originalbetriebsanleitung Seite 15

General Operating Instructions for
Yale-Hydraulic Cylinders and Hand Pumps
1. Unpacking:
Check all unpacked Yale - hydraulic units for any possible
transport damage. Report any damage to the forwarding
agent immediately, since they are not covered by the Yale
guarantee conditions.
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2. Initial Operation:
Yale-hydraulic cylinders come ready to use together with
female coupler half; all Yale hand pumps are filled with
hydraulic oil. Check oil level before initial operation.
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3. Air bleeding:
Prior to the initial operation of new hydraulic components
the system schould be de-aerated. To this end, the cylinder
should be extended and retracted several times, holding
it with the coupler connection upright while retracting the
cylinder. This leads to a concentration of air in the area
of the oil port, and the air is transported to the reservoir
with the returning hydraulic oil.
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4. Advance of hydraulic cylinder:
Connect the hydraulic hose by completely closing the
sleeve of the female coupler half. Any inclompletely closed
coupler causes the flow to be blocked by the inner balls.
The couplers are self-sealing and should therefore only
be screwed together finger-tight. Open the air-bleeding
plug on the reservoir by approx. 1/2 turn and close the
relief valve (hand wheel).
The cylinder may now be extended.
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5. Correct application:
Yale hydraulic equipments with their extremely robust
construction offer a long service life.
Nevertheless, the following points should be observed for
your own safety:
• Never exceed the maximun capacity of the hydraulic
cylinders.
• Avoid any eccentric loading of the hydraulic cylinder.
• Never stay below lifted loads, unless they are supported
additionally.
• Keep hydraulic units away from heat (welding etc.).
• Protect hydraulic hoses against damage; avoid excessive
bending and tensioning.
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6. Off-center load:
To guarantee a long service life the Yale-700 bar-Hydraulic-
cylinder Series YS, YLG, YFG, YLS, YFS, YCS, YCH,
YH and YPL are made of Chromium-Molybdenum-Steel.
The cylinder housing and plunger are specially heat-treated
and provided with two bronce bearings.
Hydraulic cylinders in general should not be side loaded.
This can lead to a reduction of the service life.
Some applications in practice, however, may require an
off-center loading. In those cases, only 50 % of the max.
operating pressure and stroke of the cylinder should be
utilized.
Be sure always to have the load resting on the total surface
of the saddle and / or piston head. In addition, the total
surface of the cylinder base shall rest on solid ground.
This especially applies to flat cylinders!
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7. Oil level / Oil change:
Oil change is required, however at least once a year.
This perfect condition of the hydraulic oil is one of the
decisive factors for the service life of yoiur hydraulic com-
ponents. Under adverse conditions (e.g. dust, humidity etc.)
the oil should be changed at shorterintervals, if required.
Be sure to use Yale-Hydraulic Oil exclusively, in order to
maintain your garantee rights. Check the oil level regularly.
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Please be eco-friendly -
dispose your waste oil as instructed!
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8. Maintenance:
All moving parts should be greased at certain intervals
(e.g. hand lever at the pump head). Oil change see under
para. 7 "oil change". Depending on their specific appli-
cation conditions, all parts should be regularly checked
for damage. Any damaged parts should be exchanged
immediately.
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9. Repairs:
Repair and maintenance should only be performed by
expert personnel; be sure to use original spare parts only.
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10. Cleanliness:
Keep your hydraulic system clean and avoid any contami-
nation and humidity. This applies in particular to coupler
connections (rinse with cleaner's naphta, if required).
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11. Hydraulic connections with 3/8-NPT:
For a simple sealing of hydraulic fittings, hoses, gauge
adaptors etc. with 3/8 NPT, wrap the male thread tightly with
approx. 2 layers of Teflon tape, leaving the first 2 threads
uncovered. Then tighten parts together well finger-tight
and check for leakage.
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12. Working safety:
All parts in the Yale hydraulic programme have been de-
signed for a max. operating pressure of 700 bar (10.000
psi) exception: 2000 bar programme.
Pressure relief valves are set to their individual permis-
sible operating pressure and must never be adjusted to
a higher value. The max. operating pressure of 700 bar
must never be exceeded. The built-in pressure relief valves
discharge the excessive pressure to the reservoir, as soon
the max. pressure has been achieved. Any external loads
must not exceed the max. capacities of the connected
hydraulic cylinder.
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