Go General Overhaul; Maintenance Schedule - DEMAG DC-Com 1 Operating Instructions Manual

8.3.5

GO general overhaul

The chain hoists are designed for a period of use of at least 10 years until the first general overhaul is carried
out. This is based on the condition that the specified group of mechanisms is not exceeded by the actual dura‐
tion of service. When the actual duration of service has reached the theoretical duration of service relevant for
the given group of mechanisms, further operation of the chain hoist is only permitted after a general overhaul
has been carried out.
The theoretical duration of service D (hours at full load h) depends on the Group of Mechanisms classification of
the chain hoist. The actual duration of service should be determined every year according to FEM 9.755. You can
arrange to have the actual service life calculated as part of the annual inspection by our after-sales service.
The owner must arrange for a GO general overhaul to be carried out when 90% of the theoretical duration of serv‐
ice has elapsed – if the chain hoists are correctly classified after 8 to 10 years. A general overhaul must be carried
out by the end of the theoretical duration of service.
During the general overhaul, the following parts must be replaced in addition to the checks and work specified in
the inspection and maintenance schedule:
● Gearbox housing with installed gear parts,
● Gear oil and gearbox cover with seal,
● Connecting elements,
● Shaft sealing rings, bearings, plugs,
● Brake.
The small parts (screws, washers, etc.) to be replaced when maintenance and assembly work is carried out are
not listed separately. The general overhaul carried out by the manufacturer or a specialist company authorised by
him satisfies the requirement to be met for continued operation of the chain hoist.
Therefore, the provisions of the relevant UVV accident prevention regulations and BGV D8 are satisfied.
The equipment may continue to be used when an expert engineer has entered the conditions for further utilisation
into the test and inspection booklet. Completion of the general overhaul must be confirmed in the test and inspec‐
tion booklet and a further period of utilisation in accordance with FEM 9.755 must be entered.
8.4

Maintenance schedule

Activity
Check continuity of the PE conductor connection
Check emergency-stop device
Check direction of movement
Check 7-segment display
Check chain lubrication (under arduous conditions, the chain must
be lubricated more frequently)
Check function of the lifting motion operating limit switch
Check function of the lowering motion operating limit switch
Check cut-off buffer/cut-off spring/operating limit switch actuator
Check control cable and control pendant housing for damage
Check operation of the brake
Check hook and hook safety catch
Check load handling attachments for deformation, cracks, damage
caused by corrosion, safety device malfunctions
Read the C switching cycles
Read operating hours to determine the remaining safe working pe‐
riod
68 Check electric switchgear and wiring
Section
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 "Mains connection", Page 42
 "7-segment display for operating sta‐
tus and fault display", Page 29,
 "Display of software version, operating
hours, number of cycles", Page 30
 "Available hoist chains", Page 77
 "Checking operating limit switches",
Page 71
 "Checking operating limit switches",
Page 71
 "Checking the cut-off buffers/cut-off
springs", Page 86
 "Checking the operating limit switch
actuator", Page 72
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 "Checking the load hook", Page 83
 "Service life of the contactor", Page 64
 "7-segment display for operating sta‐
tus and fault display", Page 29
 "S.W.P. measures for achieving safe
working periods", Page 65
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Before first put‐ Before starting
ting into opera‐ work
tion
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During the an‐
nual inspection
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