Atlas Copco LH 23 E User manual

Overhauling instructions

Handheld hydraulic breakers

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No. 3392 5143 01

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2008-02-29

11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E

LH

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No. 3392 5143 01

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2008-02-29

Contents

English ...................................................................4

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Contents

ABOUT THE OVERHAULING INSTRUCTIONS.....................................5

Repair - general information .................................................6

Torque settings ............................................................6

SPECIAL TOOLS FOR REPAIR .................................................6

DISASSEMBLY ..............................................................7

Main components ..........................................................7

Nose part ................................................................10

Valve housing ............................................................11

Trigger valve .............................................................12

Accumulator .............................................................13

Cylinder .................................................................15

E-handle ................................................................16

ASSEMBLY ................................................................19

Valve housing LH 11-LH 19 E ...............................................19

Valve housing (new type) LH 22-LH 40 E ......................................22

Cylinder .................................................................24

Accumulator .............................................................25

Main components .........................................................27

Mounting of bushing in nose part ...........................................31

Mounting of latch in nose part ..............................................32

Adjustment of E-handle ....................................................34

ENGLISH

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Overhauling instructions

About the Overhauling instructions

The aim of the instructions is to provide you with knowledge of how to make basic

overhauling of the LH 11-40 handheld hydraulic breakers.

Only qualified and trained persons may operate or maintain the breakers. Use only

authorized parts. Any damage or malfunction caused by unauthorized parts will not

be covered by the Warranty or Product Liability.

For major service to the breakers, contact your nearest authorized Atlas Copco

workshop.

Safety instructions and technical

specifications

Please consult the "Spare parts list" and the "Safety and operating instructions" for

the LH 11-40 handheld hydraulic breakers regarding safety instructions, technical

specifications, trouble shooting etc.

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Overhauling instructions

Repair - general information

Before repairing the handheld hydraulic breakers,

read the following in order to avoid incorrect repair

and damage to the breaker.

Repair other than in accordance with the

instructions given may subject the breaker to

conditions beyond the design capability, which may

result in system failure.

Notice leakages and defects before disassembly

- if necessary, consult the Trouble shooting section

in the safety and operating instructions. Test the

breaker with test equipment - a defect is easier to

find, when you have a presumption.

Danger

The breaker has a pressure accumulator. This

accumulator is pressurized even when there is no

hydraulic pressure to the breaker.

Attempting to dismantle the accumulator without

first releasing the pressure can cause personal

injury or death. The nitrogen gas pressure (N2)

must be released before carrying out further

dismantling. This procedure must be carried out by

a qualified person.

Warning

Do not repair the breaker when connected to the

hydraulic power source.

Torque settings

Use only the torque settings specified in the spare

parts list.

Caution

All bolts used on Atlas Copco equipment are high

tensile and may not under any circumstances be

replaced by bolts of a lesser tensile specification.

Special tools for repair

Punches (scrapers)

ø14 mm: Part number 3371 8156 07

ø37 mm: Part number 3371 8156 06

ø44 mm: Part number 3371 8206 14

ø47 mm: Part number 3371 8206 20

Tool for accumulator

Part number 3371 8077 60

Filling device

Part number 3371 8011 55

This part number includes the above tool for

accumulator part number 3371 8077 60

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Overhauling instructions

Disassembly

Main components

1. Mount the breaker in a vice

2. Loosen the nose part (a torque wrench can

also be used)

3. Dismount the nose part

4. Remount the breaker in the vice

5. Hammer the nabs away from the screws

6. Loosen the four screws

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Overhauling instructions

7. Remove the screws

8. Remove the handle from the accumulator

9. Loosen the four screws on the accumulator

10. Remove the accumulator

11. Remove the trigger valve

12. Loosen the screws in the valve housing

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Overhauling instructions

13. Remove the valve housing from the

cylinder

14. Remove the striking piston from the

cylinder

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Nose part

1. Mount the nose part in a vice

2. Hammer out the two roll pins and remove

the latch

3. Remove the lock pin and the spring

4. Remove the locking ring

5. Remove the chisel bellows

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Overhauling instructions

Valve housing

1. Mount the valve housing in a vice

2. Loosen and remove the P guide socket

3. Loosen and remove the T guide socket

4. Remove the spool

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Overhauling instructions

Trigger valve

1. Remove the packing gland from the trigger

2. Remove the O-ring and the seal from the

packing gland

3. Remove the trigger spool from the trigger

rod

4. Remove the Seeger spring ring

5. Remove the O-ring, the back-up ring and

the Seeger spring ring from the trigger

spool

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Overhauling instructions

Accumulator

Danger

The breaker has a pressure accumulator. This

accumulator is pressurized even when there is no

hydraulic pressure to the breaker.

Attempting to dismantle the accumulator without

first releasing the pressure can cause personal

injury or death. The nitrogen gas pressure (N2)

must be released before carrying out further

dismantling. This procedure must be carried out by

a qualified person.

1. Check for gas by means of filling device

(part number 3371 8011 55)

2. - or by means of a blunt tool

3. Mount the accumulator in a vice

4. Loosen the charging screw on the cover

5. Loosen the accumulator cover by means of

tool for accumulator (part number

3371 8077 60)

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Overhauling instructions

6. Remove the accumulator cover

7. Remove the diaphragm

8. Check the diaphragm for defects

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Overhauling instructions

Cylinder

1. Mount the cylinder in a vice

2. Remove the locking ring

3. Remove the seal

4. Remove the locking ring

5. Remove the seal and the back-up washer

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Overhauling instructions

E-handle

1. E-handle without top cover

2. Puncture the rubber handles

3. Remove the rubber handles with compressed

air (while pulling the handles)

4. Hammer out the roll pin

5. Remove the trigger lever

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Overhauling instructions

6. Hammer out the left and right latch pin with a

punch. Remove and replace the trigger pawl

if necessary

7. Remove the four springs

8. Hammer out the two roll pins (with a punch)

across from each other

9. Remove the bottom plate

10. Remove the handle rod

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Overhauling instructions

11. Remove the eight nylon guides from the

frame. Replace and grease the nylon

guides when assembling

12. Main parts of the E-handle

Note: The old E-handle with damping element

must be replaced by the new E-handle with

springs described here (see the spare parts

list).

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Overhauling instructions

Assembly

Valve housing LH 11-LH 19 E

1. Parts to be used

2. P and T location (written on housing)

3. Mount the O-rings (at both the T and the P

side)

4. P and T guide sockets

5. Mount the O-rings on the guide socket

6. Mount the auxiliary spool at the P side

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Overhauling instructions

7. Incorrect mounting of the auxiliary spool

8. Oil the guide sockets

9. Apply Loctite or similar to the guide socket

thread

10. Mount the P guide socket at the P side

11. Mount the spool at the T side (notice the

milling pointing to the T side)

12. Mount the T guide socket at the T side

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