M A I N T E N A NC E
Page 34
M A I N T E N A NC E
JDN Air Hoists are extremely robust and require little
maintenance. Compliance with maintenance and inspec-
tion intervals is of great importance, in order that the
hoist operates safely and reliably over a period of many
years. It is essential that the intervals are shortened
under particularly wear-promoting operating conditions.
C AU T I O N !
Maintenance work on JDN Air Hoists must
only be performed by trained and qualified
personnel.
If your JDN Air Hoist is often used at different locations,
particularly in dirty and damp environments,
clean the hoist and the chain of dirt contamination,
seal off the air supply connections,
store the hoist in a clean and dry place.
If, during repair work, the replacement of components
is necessary, only original JDN spare parts may be
installed.
(see section
Lubricants,
page 25)
Series lifting equipment is classified into groups and
dimensioned according to the type of operation (Driving
mechanism classification according to ISO/FEM). The
classification (M3/1 Bm) is determined by the average
daily operating time (max. 1 hour) and the load spec-
trum. The theoretical operating time for load spectrum
2 (average) is 1600 hours. This corresponds to 400 full-
load hours. This is provided that the lifting and lowe-
ring paths are approximately the same.
For devices used mainly in vertical operation (from 75 %
of on-time), the theoretical operating time is reduced
due to the higher lowering speed in the range from
50 % to 100 % of the nominal load.
Therefore, the determined portion of the theoretical
operating time must be multiplied by a factor of f
v
.
The factor f
v
has a value of 1 to 50 % of the nominal
load, increasing linearly to 1.5 at 100 % of the nominal
load (nominal load percentage P).
In order to achieve safe operating periods, the company
must check that the theoretical operating time has been
achieved during each inspection, by the person respon-
sible. This must be documented in the inspection log at
least once annually. The inspection log contains a
model for determining the actual operating time.
A general overhaul must be performed, when the theo-
retical operating time has been achieved. Detailed
explanations for the determination of the actual opera-
ting time and its documentation can be found in the
national safety regulations. The general overhaul must
be initiated by the operator and must be documented in
the inspection log. Information on general overhaul can
be requested from the manufacturer.
f
v
= 1+ 0,5
P-50
50
(for P > 50%)
I N S P E C T I O N A N D R E PA I R S
L U B R I C A N T S
S PA R E PA R T S
C L E A N I N G A N D C A R E
M A I N T E N A N C E A N D
I N S P E C T I O N I N T E R VA L S
