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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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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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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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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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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5. Remove -rings and parallel pin from cylinder.
6. Remove steering ring and distributor from valve body.
7. Remove -rings from steering ring.
ASSEMBLING VALVE BODY AND DISTRIBUTOR
1. Check all parts for wear and damage. If necessary, use fine emery cloth
or grinding agent. Clean and oil all parts.
2. Install -rings to steering ring.
3. il parts properly and insert distributor into steering ring.
4. Apply oil on distributor parts and valve body hole.
5. Install steering ring and distributor to the valve body. Check that distrib-
utor moves freely inside.
6. Install -rings to cylinder.
7. Insert parallel pin.
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8. Apply anticorrosive agent on contact surfaces of valve body and cylin-
der.
9. Install valve body.
10. Install -rings to valve body.
11. Install seals and -ring to cover using suitable pliers.
12. Install cover.
13. Install cover screws and lock washers. Torque screws to the specified
settings.
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1.6 PRESSURE ACCUMULATOR
LUBRICANTS FOR PRESSURE ACCUMULATOR
DISASSEMBLING PRESSURE ACCUMULATOR
Warning Make sure that accumulator is depressurized See Releas-
ing pressure from accumulator on page 4.
1. Remove cover, valve body and distributor. See Valve body and distrib-
utor on page 8.
2. Remove support ring.
Item Lubricant
Accumulator cover (gas side) (A) Silicone grease
Accumulator membrane (inner side)
(B)
Hydraulic oil
Casting burr (C)
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3. Remove accumulator cover.
4. Remove membrane from cylinder.
ASSEMBLING PRESSURE ACCUMULATOR
1. Clean and dry parts carefully.
2. Apply thin layer of oil to membrane and accumulator area in cylinder.
3. Put cylinder on vise.
4. Install a new membrane on cylinder. Check that the edge of the mem-
brane which have casting burr go first. Be careful not to damage the
membrane when pulling it over shoulders of cylinder.
5. Apply silicone grease inside accumulator cover. To prevent risk of gas
leak be careful not to stain silicone in sealing grooves. Align split pin be-
tween accumulator cover and cylinder. Install accumulator cover in its
place. Use plastic hammer if necessary.
6. Install support ring.
7. Install distributor, valve body and cover. See Valve body and distributor
on page 8.
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1.7 CHARGING ACCUMULATORS
TORQUES, ADJUSTMENTS AND LUBRICANTS
CHARGING ACCUMULATOR
Warning Use only nitrogen (N2) for charging accumulator. Use of oth-
er gases may cause accumulator to explode.
1. Install new usit ring.
2. Install filling plug.
3. Install adapter with -ring.
4. Insert pin.
Item Tightening torque
Shield plug (A) 1 0 Nm
Accumulator filling plug (B) 20 Nm
Item Charging pressure (Nitrogen N2)
Accumalator 2 bar
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5. Insert pin.
6. Install charging device.
7. Connect charging system to nitrogen bottle.
8. Tighten filling plug carefully through charging device until you feel it stop,
then open it three (3) turns.
9. pen discharge valve on charging device fully.
10. Carefully open nitrogen gas bottle valve and adjust gas flow to minimum.
11. CAUTI N! Charging device does not have any pressure relief valve.
Shut gas bottle valve when gauge shows correct charging pressure.
12. Close discharge valve on charging device and charge accumulator 2-3
bar above specified charging pressure. bserve pressure gauge read-
ing.
13. Shut nitrogen bottle valve.
14. Wait 10 minutes for nitrogen gas pressure to stabilize inside accumula-
tor.
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15. Adjust pressure in accumulator to correct setting by carefully opening
discharge valve.
16. Torque filling plug through charging device to specified setting.
17. Release pressure from charging hose by opening discharge valve.
18. Remove charging system from accumulator.
19. Check accumulator for nitrogen leak by filling Usit-ring area with thin oil.
If gas bubbles appear, discharge accumulator and replace Usit-ring.
20. Install shield plug with -ring.
21. Torque plug to specified setting.
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1.8 BODY PARTS
TORQUES, ADJUSTMENTS AND LUBRICANTS
Item Lubricants and accessories
Contact surfaces of cylinder and
valve body
Anticorrosive agent (e.g. CRC 3-36)
All seals and O-rings O-ring grease
Screw threads and bearing surfaces,
lock washers. Outer surfaces of the
lower tool bushing.
Thread grease
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forAvan
DISASSEMBLING BODY PARTS
Warning The hydraulic pressure inside the hammer must always be
released before removing any of the plugs or valves. Read the instruc-
tions on releasing the hydraulic pressure from the hammer. See Re-
leasing hydraulic pressure from hammer on page 3.
1. Remove piston.
2. Set power cell to horizontal position. Remove lower tool bushing.
3. Remove split pins.
4. Remove seal carrier. Use hook and sliding hammer.
5. Remove seals and -ring from seal carrier.
ASSEMBLING BODY PARTS
1. Check all parts for wear and damage. If necessary, use fine emery cloth
or grinding agent. Clean and oil all parts.
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2. Install seals and -ring to the seal carrier using suitable pliers.
3. il seal carrier and cylinder properly and install seal carrier to the cylin-
der. Note the seal carriers direction. Align split pin holes in the seal car-
rier and cylinder.
4. Install lower tool bushing and tool retaining pin.
5. Install split pins to the cylinder.
6. il cylinder and piston properly. Insert piston into cylinder.
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