Yale RPYS-1215 Originalbetriebsanleitung Seite 14

Operating Instructions for
Hydraulic Test Rig 12 tons Model:
5. Testing the brake during the lowering process
5.1 Retract the piston of the hydraulic cylinder completely
by opening the relieve valve of the hand pump.
5.2 Tension the chain of the hoist by hand and position
the hoist to "lower".
5.3 Operate the hand pump. The hydraulic cylinder
advances, loads the hoist and closing the brake.
5.4 Release the brake of the hoist by operating the hand
lever of the hoist in lowering position.
5.5 Operate the hand pump and advance the cylinder
against the brake of the hoist.
Repeat this procedure a few times.
In this way, the proper function of the brake can be
tested. The cylinder stroke of 150 mm normally allows
a full rotation of the load sheave of the hoist and can
be used several times in succession.
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6. Regulations
German regulations require a test at working load
limit It can differ from country to country. Check national
standards to ensure compliance with the law.
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7. Pressure gauges
For a better reading of the pressure (resp. force) the
test rig is equipped with two pressure gauges:
1 pce. GGY-1005 (0-160 bar for hoists up to 4 ton)
1 pce. GGY-1003 (0-400 bar for hoists up to 12 ton)
Attention: Never overload the pressure gauges !
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8. Shut-off valve VHM-2
The VHM-2 can be used for hermetic shut-off the
loaded piston in order to monitor exactly a possible
pressure drop caused by a slipping hoist brake.
Attention: Never overload the pressure gauges while
the VHM-2 is closed.
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Incidently please note our "Operating Instructions for
Yale Hydraulic Cylinders and Pumps"
14
RPYS-1215