10
All units with two or more chain strands must be inspected
before every operation for twisted or kinked chains. Chains
on 2-strand units may become twisted if the bottom block
is rolled over . If a strand is twisted disconnect it from the
hoist and re-thread it correctly . In some cases it may be
necessary to remove the last link.
8. Before initial operation lubricate the unloaded chain and
test all hoist functions under a no-load condition.
Inspect the hooks for deformation, damage, surface cracks,
wear and signs of corrosion as required but
. Adverse working conditions may dictate shorter
periods. Hooks that do not fulfill all requirements must be
replaced immediately, Welding on hooks to compensate
for wear or damage is not permissible. Hooks must be
replaced when the mouth of the hook has opened more
than 10% (Fig.14) or the nominal value of other dimensions
has decreased by 5% due to wear . Nominal dimensions
and wear limits are shown in the following table.
In particular check following parts:
• Side plate
For cracks or deformation in particular around the areas of
Visually check for cracks and wear on trolley wheel flanges.
In particular around threaded areas for cracks.
Check nuts, screws and locking devices for tightness.
6.6 Electric chain hoist in general
In particular check following parts:
• Threaded connections in general
Check all nuts, screws and locking devices for tightness.
Ensure the chain container is securely fastened. Check
(Connection between hoist and suspension hook resp.
trolley) Check for cracks or wear. Ensure all safety devices
The overload protection device ( slipping clutch) is factory
10% of the rated capacity and can be checked
by lifting a suitable load. If the device slips at the rated
• Increase the moment of friction by turning the straining
screw (45) in clockwise direction.
• Re-check the adjustment with a suitable load.
• Lock the straining screw (45) with the threaded pin (9).
The gearbox is practically maintenance-free. Service is
therefore reduced to changing the oil.
The oil (approx. 0,3 l) is to be changed every 5 years or at
the latest after 400 operating hours.
Disassemble the gear cover (51) by removing the cylinder
screws (52) and unscrew the screw plug (44). Place the
hoist horizontally and turn so that the oil can drain from the
fill hole into a suitable container (approx. 30 minutes).
Replenish the gearbox oil. W e recommend a mineral oil
viscosity class ISO-VG 460, e.g. FINA GIRAN L 460. Finally
re-adjust the overload protection device.
The gearbox has oil lubrication
1. Pull the coupling (50) of f the gear shaft (35). Loosen
screws (52) and remove gearbox cover (51).
2. Remove screw plug (44) and seal (45).
3. Place gearbox upside down and drain oil from the fill
hole into a suitable container .
