Lukas 81-50-35, Instruction Manual

23

In the case of a 

monocoupling system:

Hose lines cannot be 

coupled

They are under excessive 

pressure (e.g. due to 

excessive ambient 

temperature)

Open discharge valve and 

bleed device.

Coupling defective

Coupling should be 

replaced immediately.

In the case of a 

monocoupling system:

Hose lines frequently 

cannot be coupled

Hydraulic fluid of the 

application situation not 

adapted

Hydraulic fluid needs 

to be changed (see the 

chapter “Hydraulic fluid 

recommendation” for more 

information).

Coupling defective

Coupling should be 

replaced immediately.

In the case of a quick-

disconnect coupling 

system:

 Hose lines cannot 

be coupled

System is under pressure Open discharge valve and 

bleed device.

Coupling defective

Coupling should be 

replaced immediately.

In the case of a 

monocoupling system:

Leakage at the couplings

Coupling defective

Coupling should be 

replaced immediately.

In the case of a quick-

disconnect coupling 

system:

 Leakage on the 

male coupling

Safety valve has 

responded (in the 

decoupled state)

After depressurisation, no 

further leakage occurs.

Male coupling defective

Male coupling should be 

replaced immediately.

In the case of a quick-

disconnect coupling 

system:

 Leakage at the 

female coupling

Female coupling defective Female coupling should be 

replaced immediately.

Hydraulic fluid escaping 

from the hoses or at the 

joints

Leakage, possible damage Replace hoses.

Damage on the surface of 

the hydraulic hoses

Mechanical damage or 

contact with aggressive 

media

Replace hoses.

If the defects cannot be remedied, notify an authorised LUKAS dealer or contact LUKAS 

Customer Service directly!

The address of LUKAS customer service is:

LUKAS 

 Hydraulik GmbH

Weinstraße 39,  D-91058 Erlangen

Tel.:  0049 (0) 91 31 / 698 - 348

Fax.:  0049 (0) 91 31 / 698 - 353

http://www.lukas.com

Problem

Cause

Remedy