Repair

Operation

Repair

Repair

WARNING

Hydraulic system under high pressure

Carrying out repairs on the pressurised hydraulic attachment may lead to serious injury. Connections may come loose unexpectedly, parts may move suddenly and hydraulic oil may squirt out.

  1. Depressurise the hydraulic system before carrying out repairs to the hydraulic attachment or the carrier (see chapter Depressurising the hydraulic system).

  1. 1.
    For technical support contact the Epiroc Customer Center / Dealer in your area.

Sending in the hydraulic attachment for repairs

NOTICE

Mixed hydraulic oil

Never mix mineral and non-mineral hydraulic oils! Even small traces of mineral oil mixed in with non-mineral oil can result in damage to both the hydraulic attachment and the carrier. Non-mineral oil loses its biodegradability.

  1. Only use one type of hydraulic oil.

  1. 1.
    Always specify which hydraulic oil has been used when sending in the hydraulic attachment to have it repaired.

Welding

  1. 1.
    Only commission qualified welding specialists to perform welding; specialists are people who:

  • have been trained to operate MIG welding equipment according to the national regulations,

  • know all the relevant national/regional safety and accident prevention regulations and

  • who are familiar with and understand these Safety and Operating Instructions.

WARNING

Hot hydraulic oil squirting out

The hydraulic system is under high pressure. If hydraulic connections come loose or are disconnected, hydraulic oil will squirt out under high pressure. Hydraulic lines may spring a leak or burst. Hydraulic oil squirting out can lead to serious injury.

  1. Depressurise the hydraulic system before carrying out repairs to the hydraulic attachment or the carrier (see chapter Depressurising the hydraulic system).

  2. Depressurise the hydraulic system according to the manufacturer's safety and operating instructions for the carrier.

WARNING

Hot parts

The hydraulic cylinder, hoses, pipes and fittings become very hot during operation. Touching them may lead to burns.

  1. Never touch hot parts.

  2. If you have to carry out activities where you have to touch the parts, wait for them to cool down first.

NOTICE

Environmental damage due to hydraulic oil

Hydraulic oil is environmentally harmful and must not penetrate the ground or enter the water table or water supplies.

  1. Collect any hydraulic oil which escapes.

  2. Dispose of it in accordance with the applicable environmental regulations.

Hard facing the cutter jaws

  1. 1.
    Depressurise the hydraulic system (see chapter Depressurising the hydraulic system).
  2. 2.
    Check which sections of the cutter jaws are to be hard faced.
  3. 3.
    Grind the worn out tip of tooth very well. Clean up the surface of hardface. Remove buffer material and crushed stone pieces.
  4. 4.
    Weld the points (A), (B), (C), and (D) with a buffer layer (see chapter Welding regulations).
  5. 5.
    Weld point (D) (only the tip of the tips) to hard-face the tip of tooth.

NOTICE

Damage due to hard facing with lack of buffer layer

  1. Hard facing directly onto the cutter jaw base material may cause the cutter jaw to crack.

  2. Weld the buffer layer on first before hard facing.

  1. 1.
    Observe the following welding regulations to achieve optimum reworking.

Welding hard facing of cutter jaws

Welding regulations

Preheating temperature to buffer layer

> 100 ºC

Welding filler for buffer layer

DCMS-IG solid wire electrode EN 12070 G Cr Mo 1 Si, Material 1.7339

Inert gas

EN 439-M 21

Intermediate layer temperature

100 - 180 ºC

Preheating temperature for hard facing welding

100 ºC

Intermediate layer temperature

100 - 200 ºC

Welding filler for hard facing

EN 12072 G 13 4CN 13/4 solid wire electrode (Böhler)

Inert gas

EN 439-M 21

Cooling

Under cover

Surface hardness

38 - 42 HRC

Cutter jaws

  1. Hard facing CN 13/4-IG