DEMAG Electric Chain Hoist Demag DC-COM 1

Check brake wear depending on the year of manufacture of your chain hoist:

● When the max. brake displacement is reached (see  Tab. 64, Page 88), the brake must be replaced immediately.

● For brake displacement up to 0,5 mm, the brake can still be used until the next maintenance is due.

As of year of manufacture 04/2009

Since 04/2009 – depending on the size of model – brakes have been gradually equipped with a plug inside the brake housing to enable brake wear to be measured without the need to remove the brake. Brake wear is measured by the air gap.

Disconnect the chain hoist from the power supply (mains connection switch) and secure it against switching on again.

● Open the electric equipment cover.

● Unscrew brake plug screw (1) from the brake.

Dispose of waste oil in accordance with environmental protection requirements.

Under normal operating conditions, the lubricant must be changed at least every 10 years. Under exceptional conditions, e.g. increased ambient temperatures, we recommend that oil changes be adapted to suit these conditions.

Demag special oil with wear-minimising additives, range of viscosity 10W-30 (part no. 664 020 44) for slipping clutch without speed monitoring. Malfunctions of the slipping clutch may occur if oils are used that are not approved. Contact the manufacturer for ambient temperatures lower than -20 °C or higher than +45 °C.

Safe operation cannot be ensured

Malfunctions of the slipping clutch may occur if oils are used that are not approved and safe operation can then no longer be ensured.

Does the return sprocket turn easily?

Are the load bars removed from the bottom block?

Does the bottom block move easily during lifting and lowering operations?

Are there any abrupt movements of the bottom block?

When was the return sprocket last replaced?

Sign off on the monthly return sprocket check

WARNING: Non-compliance with operating and maintenance regulations can lead to danger to life and limb. Required tests and inspections must be carried out. This work may only be carried out by specialist personnel.

Hoists and cranes must be inspected by an experienced technician at least once a year.

Visual inspection and function check completed

Condition of components and equipment checked for damage, wear, corrosion or other alterations

Integrity and efficiency of safety devices checked

Defective parts and components replaced

Load-bearing media and suspensions inspected along their entire length

Function and brake test with a load carried out

Remove guide half sections (1) (four M 6 bolts)

Remove bottom block retaining bolts (2) and remove the bottom block

Insert the new chain into the bottom block in the same position and orientation (chain must operate without any twist)

Re-assemble the bottom block and tighten bolts (2) to a torque of 52 Nm

Check correct fit of the four cut-off springs (3) in new halves (4) of the bottom block

Install new guide half sections (1) and tighten bolts (5) to a torque of 5,5 Nm

Perform a function check (run against the operating limit switches and check against the 7-segment display)

Sign off on the bottom block standard replacement