Avantco B70 Silent Instruction manual

AVANT B70 Silent
AVANT B110 Silent
AVANT B160 Silent
Workshop Manual

1. DISASSEMBLY AND ASSEMBLY
1.1 MAIN COMPONENTS
LOCATION OF MAIN COMPONENTS (HAMMER MECHANISM)
A. Pressure measuring plug
B. Pressure accumulator
C. Valve body
D. Cylinder and front head
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1.2 RELEASING HYDRAULIC PRESSURE FROM
HAMMER
RELEASING PRESSURE
Warning The hydraulic pressure inside the hammer must always be
released before making any adjustments or repairs when the hammer
is connected to the carrier. There may also be pressurized oil trapped
inside the hammer even if the hammer is disconnected from the carri-
er. Release the hydraulic pressure according to the following instruc-
tions before opening any plugs or valve covers.
1. Stop the carrier engine.
2. perate boom and hammer controls to release any pressure trapped in-
side hoses.
Warning This procedure does not release the pressure from the pres-
sure accumulators Read the instructions dealing with the accumula-
tor before disassembling the hammer. See Releasing pressure from
accumulator on page 4.
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Disassembly and assembly
hydraulic breaker

1.3 RELEASING PRESSURE FROM ACCUMULATOR
LOCATION OF ACCUMULATOR REFILLING PLUG
RELEASING PRESSURE FROM ACCUMULATOR
Warning Do not disassemble hammer before releasing pressure from
accumulator.
1. Remove shield plug from accumulator.
2. pen filling plug carefully. Wait until all nitrogen gas has escaped.
Item Description
A Shield plug
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1.4 HOUSING
TORQUES, ADJUSTMENTS AND LUBRICANTS
Item Lubricant
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Disassembly and assembly
hydraulic breaker
All screw threads and bearing surfaces Thread grease
Item Tightening torques
Housing plate mounting screws (B) 70 Nm 17 Nm 17 Nm
Model B70 B110 B160

DISASSEMBLING HOUSING
Warning The hammer must be secured from falling down in either di-
rection when handling it. Check that the lifting capacity of the hoist
you are using is sufficient for the job.
1. Remove hydraulic hoses.
2. pen mounting bracket screws.
3. Remove screws and lock washers.
4. Install lifting eye nuts using screws to the housing plate flange.
5. Lift housing plate off with lifting device.
6. Lift hammer mechanism out from housing.
7. Remove dampers.
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8. Remove parallel pins.
ASSEMBLING HOUSING
1. Install dampers to both housing plates.
2. Insert parallel pins.
3. Install hammer mechanism into its place.
4. Lower remaining housing plate into its correct position.
5. Install compression screws crosswisely.
6. Compress housing plates together with compression screws.
7. Grease threads and bearing surfaces of screws and lock washers.
8. Install screws and lock washers to remaining holes and tighten fully;
Then replace compression screws.
9. Torque screws to specified setting.
10. Install mounting bracket.
11. Grease screws with lock washers and nuts.
12. Torque screws to specified setting.
13. Install hydraulic hoses.
14. Install hammer to carrier.
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Disassembly and assembly
hydraulic breaker

1.5 VALVE BODY AND DISTRIBUTOR
TORQUES, ADJUSTMENTS AND LUBRICANTS
Item Lubricant
All seals and O-rings O-ring grease
All parts Hydraulic oil
Contact surfaces of cover, valve body
and cylinder
Anticorrosive agent (e.g. CRC 3-36)
Screw threads and bearing surfaces,
lock washers
Thread grease
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Item Tightening torques
Cover screws (A) 70 Nm 17 Nm 460 Nm
Nozzle (B), width across flats 7 mm 20 Nm 20 Nm 30 Nm
Pressure measuring plug (C) 30 Nm 30 Nm 30 Nm
Model B70 B110 B160

OPERATING PRESSURE ADJUSTMENT
The hammer is tuned at factory to suit for specified AVANT carrier models.
This is done with a nozzle which is inside the UT-port of the breaker,
located on the valve housing.
The nozzle adjust the operating pressure of the hammer. If the nozzle is not
suitable for the excavator, then the hammer power may be low or the oil has
a tendency for heating. In either case please contact your dealer for further
instructions.
1. Remove hose fitting from " UT" port.
2. Remove nozzle from inside " UT" port using socket wrench.
3. Insert proper nozzle and tighten it to specified setting. Do not apply lock-
ing fluid.
4. Install hose fitting to " UT" port.
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Disassembly and assembly
hydraulic breaker

DISASSEMBLING VALVE BODY AND DISTRIBUTOR
Warning Make sure that accumulator is depressurized See Releas-
ing pressure from accumulator on page 4.
1. pen cover screws and remove cover.
2. Remove seals and -ring from cover.
3. Remove -rings from valve body.
4. Lift valve body off and set valve body upside down on work bench.
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