Maintenance; Head Assembly - Avdel 74405 Manuel D'instructions

M a i n t e n a n c e
Every 500,000 cycles the tool should be completely dismantled and new components should be used where worn, damaged or
recommended. All 'O' rings and seals should be renewed and lubricated with Moly Lithium grease EP 3753 before assembling.
The employer is responsible for ensuring that tool maintenance instructions are given to the appropriate personnel.
The operator should not be involved in maintenance or repair of the tool unless properly trained.
The air line must be disconnected before any servicing or dismantling is attempted unless specifically instructed otherwise.
It is recommended that any dismantling operation be carried out in clean conditions.
Prior to dismantling the tool it is necessary to remove the nose assembly. For simple removal instructions see the nose assemblies
section, page 9.
Remove Bleed Screw 32 and Washer 31 and drain oil from tool.
For total tool servicing we advise that you proceed with dismantling of sub-assemblies in the order shown below.
To disconnect the Oil Hose 46* and Air Delivery and Return Hose 45* from the tool, disengage Spiral Protection Sleeve 47* from
Sleeve 39 and lower Sleeve 39 to gain access to the hoses.
Disconnect Air Hoses by pushing and releasing the quick release connectors. Using two spanners, undo Oil Hose 46* at Air Connector
38 leaving the connector attached to the handle of the tool. Remove the tool.
Remove the nose equipment from the tool by loosening the nose tip lock nut and unscrewing the nose tip. Unscrew Nose Casing 33,
and with the aid of spanners* remove the components of the nose assembly. Remove the two Air Tubes 48* from the Centre
Connectors 1.
H e a d A s s e m b l y
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Using the pins of the combination spanner*, unscrew Stroke Adjustment Lock Nut 12.
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Withdraw Stroke Adjustment Lock Nut 12, Air Motor Assembly 49, Spring 13, Movement Pivot 22, Shim Adjustment Ring 23,
Piston 24 and Lip Seal 25.
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Grip the flats on the Air Motor Casing 3 in a vice fitted with soft jaws and with a spanner* separate the air motor assembly from the
Piston 24. Spring 13 and Stroke Adjustment Lock Nut 12 can now be removed from Air Motor Casing 3.
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Using circlip pliers* remove Circlip 26 and extract Lip Seal 42.
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From the Air Motor Casing 3 remove Centre Connector 1 using an Allen key* and extract Spring 2, Ball 4 and Pushrod 5.
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Reassemble in reverse order of dismantling, observing the following:
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Use nylon bush* and pusher* to fit Lip Seal 42 into it's housing.
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Use circlip pliers* to fit Circlip 26.
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Insert metal bush* into Handle 28.
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Fit Lip Seal 25 onto Piston 24.
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Screw bullet* onto Piston 24 to ease insertion of Lip Seal 25 into the handle.
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Insert Piston 24 into the handle through the metal bush*, then remove the bush* and bullet* from the piston.
R e a s s e m b l y o f H e a d A s s e m b l y
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Assemble in reverse order of dismantling
When reassembling, clean threads of air motor and piston and assemble using Loctite ® 243.
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*refers to items included in the 74405 Service Kit. For a complete list see page 11.
Item numbers in bold refer to the Base Tool General Assembly drawings and Parts Lists pages 16-17.
Item numbers bold* refer to the Intensifier General Assembly drawings and Parts List pages 18-19.
I M P O R T A N T
Read Safety Instructions on page 4.
The tool shall be examined regularly for damage and malfunction.
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