Atlas Copco LH 11 User manual

Overhauling instructions
Handheld hydraulic breakers
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
LH

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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
Contents
Contents
English ...................................................................4

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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
Contents
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
Overhauling instructions
13. Remove the valve housing from the
cylinder
14. Remove the striking piston from the
cylinder

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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
Overhauling instructions
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
Overhauling instructions
6. Remove the accumulator cover
7. Remove the diaphragm
8. Check the diaphragm for defects

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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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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LH 11, 18, 19 E, 22, 23 E, 27, 28 E, 39, 40 E
© 2008 Atlas Copco Construction Tools AB | No. 3392 5143 01 | 2008-02-29
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