Correction sheets

Maintenance manual: Safe load indicator

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Important information

This additional page applies to the maintenance instructions for the following GMK truck cranes:

GMK 2035GMK 3050

GMK 4075GMK 5100

GMK 5180 / 5200GMK 6200-1/6220/6220–L

GMK 6250 / 6300GMK 7450

Reasons for the additional information

Through product observation, Deutsche GROVE GmbH has discovered that contact problems can arise on the slip ring assemblies of the cable drums for the safe load indicator when the lubricant with GROVE part number 3315060 is used.

About this correction sheet

This supplement contains descriptions of the corrections made in chapter 5, Maintenance overview, and chapter 8, Description of maintenance work on the superstructure, of the maintenance manuals for the truck crane types listed above.

5.2.5 Maintenance and inspection plan M6: every 6 months / after 500oper. hrs. M6

Maintenance work on the SUPERSTRUCTURE every 6 months / after 500 oper. hrs.

–Service the slip ring assemblies in the cable drums; à Chapter 8.

8.7.1 Maintenance of the slip ring assembly of the cable drum

Maintenance of the slip ring assembly is carried out in order to prevent contamination and corrosion and to prevent malfunctions on the SLI. The GMK truck cranes have two cable drums whose slip ring assemblies must be serviced.

There is a cable drum (1) on the left side of the main boom.

GRisk of crushing when extending or retracting boom

Secure the boom against unintentional movement, so that your fingers will not be crushed by retracting telescopic sections or by the turning slip ring assembly. If you are carrying out this operation with the help of someone else, communicate with the person in the crane cab by means of clear hand signals.

The second cable drum (1) is located in the main boom underneath the telescoping cylinder.

You can reach the cable drum through the manhole if you first extend telescopic section I by approx. 2m (ca. 6.6ft).

HThe following sections describe the maintenance procedure for the outer cable drum. Maintenance on the cable drum in the boom is carried out in the same way.

Prerequisites

Before maintenance, the following requirements must be met:

–The main boom must be resting in the boom rest.

–The battery master switch must be switched off; à Operating instructions, Chapter Crane engine, Section Turning off crane engine.

GRisk of damaging the safe load indicator

Before maintenance work on the slip ring assembly, always switch off the battery master switch so that the cable drum is current-free. This prevents short circuits which may lead to damage to the central unit.

To remove abrasion particles from the contact brushes, use only dry, oilfree air or a clean, lint-free cloth.

• Make sure that the cable drum is currentfree.

• Unscrew all screws (1) and remove the casing (2).

• Check the seal on the casing for damage and replace it if necessary.

• Remove any moisture in the casing with a clean, lint-free cloth.

• Remove visible dirt on the slip rings (2) with dry, oil-free air or a clean, lint-free cloth.

• Check to make sure all screws (1) are tight.

• Put the casing (2) back in place. Make sure that the seal is in the right place.

• Fasten the casing with all the screws (1).

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