When the DWP% reaches zero, a general overhaul (GO) must be conducted. For more
information, see chapter General overhaul.
7.3.2
General overhaul
In the general overhaul (GO) service, the product is assigned with a new, runtime-based design
working period (DWP), provided that it is safe to continue the operation. The runtime-based
DWP means the lifetime of the interchangeable rotating components of the hoist, for example,
the hoisting gear and the hoisting motor. For instructions on how to perform the DWP
calculation, see chapter DWP calculation.
WARNING! MACHINE MALFUNCTION HAZARD
Using a defective chain hoist could cause serious injury, death, or damage to the
equipment.
When the DWP of the chain hoist has decreased to zero or is counting in the negative,
do not use the chain hoist until after a GO service has been conducted. Alternatively,
replace the chain hoist with a new one.
WARNING! MACHINE MALFUNCTION HAZARD
When performing the general overhaul, do not change the construction of the chain
hoist or repair the supporting structures without permission of the manufacturer.
Unauthorized changes or modifications to the product could cause serious injury,
death, or damage to the equipment.
If there are any deformations, cracks or corrosion in the supporting structures of the
hoist, replace or repair the parts according to the instructions that given by the
manufacturer.
Only authorized service personnel or an experienced service technician who is authorized by
the manufacturer or the manufacturer’s representative may conduct a general overhaul service.
The data and the information about conditions based on which the general overhaul should be
performed can be provided for a chain hoist by one or more of the following means:
• A time counter keeping track of the hoist operational hours (runtime)
• Manual bookkeeping/diary/logbook about the use and the operating conditions of the hoist.
NOTE
The same hoisting machinery can undergo no more than two general overhauls before it
must be replaced completely.
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 duration of service. When the actual duration of service has reached
the theoretical duration of service valid for the group of mechanisms, further operation of the
chain hoist is only permissible after a general overhaul.
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 is to be determined annually in
accordance with FEM 9.755. During the annual inspection by our after-sales service, you may
have the actual service life determined.
Upon expiration of 90% of the theoretical duration of service – if the chain hoists are correctly
classified after 8 to 10 years – the owner must arrange for a general overhaul to be carried out.
A general overhaul must be carried out no later than when the end of the theoretical duration of
service is reached.
During the general overhaul the following parts must be replaced in addition to the checks and
work specified in the inspection and maintenance schedule:
OWNER’S MANUAL
This document and the information contained herein, is the exclusive property of Verlinde S.A.S and represents a non-
public, confidential and proprietary trade secret that may not be reproduced, disclosed to third parties, altered or
otherwise employed in any manner whatsoever without the express written consent of Verlinde S.A.S. Copyright 2020
© Verlinde S.A.S. All rights reserved.
6/2020
