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 12.2.13 Oil Lines
The oil supply line between the cylinder and the control valve should be checked for freedom
from corrosion, leaks, excessive vibration, and adequate support.
12.2.14 Drifting of Lift Platform
Drifting of a hydraulic lift may be an indication of a potentially hazardous situation and
should be carefully investigated to determine the cause of the drifting. This information is
necessary so that a decision can be made as to whether it is safe to allow the lift to continue
in.service. Cylinders which cannot be inspected visually should be tested in the following
manner with no load on the lift. Locate and mark the location of the lift for any convenient
position. Open the disconnect switch for 15 minutes. Note the position of the car platform with
respect to the reference mark. A change in lift position that cannot be accounted for by visible
oil leakage or temperature change of the oil indicates a leak of the cylinder or in the underground
piping and a need for further inspection, tests, or repairs.
12.3 PERIODIC INSPECTION AND TESTS
12.3.1 Scope
This section describes various operational tests that are recommended to be performed on an
annual basis. In addition, there are other tests and inspections that should be performed every
three years. It should be specifically documented on the inspectors report that these tests have
been performed and the dates the tests were made.
12.3.2 Flexible Hydraulic Hose And Fitting Assemblies And Flexible Couplings
Examine flexible hose and fittings assemblies, and flexible couplings as previous described.
Flexible hydraulic hose and fitting assemblies should be subjected to a test at three times the
working pressure. After six years, they must be replaced; the replacement date should be marked
on the hose.
12-7
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