Avdel 07271 Betriebsanleitung Seite 58

AIR CYLINDER ASSEMBLY
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The air cylinder assembly is normally trouble free and will not require any attention for long periods.
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If the air cylinder assembly requires dismantling, service tool part number 07900-00206 will be required.
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There are three pistons on the 07271 model, and only two pistons on the 07274 model.
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To dismantle the air cylinder assembly, remove handle assembly 56 or manifold 69, as applicable.
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Remove cursor assembly 21, by inserting a mandrel through the front of the barrel 59 until it engages in the cursor. Pull out the
mandrel and cursor together.
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Remove tail jaw assembly 7 as previously described.
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Pull out mandrel guide 17.
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Slide off plastic sleeve 60 or 65, easing it over drilled screw 41.
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Remove screw 25 and remove barrel nut 23.
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Slide out barrel 59, spacing collar 39, spacer 13, buffer 15, back-up ring 24 and bush stops 12.
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Undo rear end cap screws 36, 29, 14, noting their positions.
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On the 07271 & 07274 model, remove drilled screw 41, then remove end cap 40.
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Remove gland cup 30, piston seal diaphragm 31, piston diaphragm 32 and second spacing collar 39, noting position of each part.
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On the 07271 model undo cylinder diaphragm seal 32, two screws 29 and pull out the remaining two pistons and the third spacing
collar.
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Insert the cylinder assembly tool* to engage in the front diaphragm with the stem passing through the front of the tool, and tighten
lightly with a washer and a nut to hold the diaphragm against the spring pressure, whilst final screws 29 are removed.
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Measure free length of the spring is 139.5 mm (5.5"), replacing if damaged.
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Reassemble using the procedure described below:
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Assemble diaphragm seal assembly 33, piston spacer 16, piston diaphragm 32, gland cup 30 and piston seal diaphragm 31 onto
the assembly tool with the spring 22 and insert into the cylinder.
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Draw diaphragm seal assembly 33 into position with the nut and rotate using a tommy bar to align the screw holes.
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Position four screws 29 into diaphragm and fully tighten top two screws 29.
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Remove assembly tool, then tighten bottom two screws 36.
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Grease and replace spacing collar 39 and barrel 59.
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Grease and fit next piston assembly onto barrel 59 and carefully push in the second cylinder diaphragm, rotating it into position
with the assembly tool.
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Insert top two screws 29 and replace second spacing collar 39.
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On the 07274 model replace end cap 40.
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On the 07271 model replace the final piston and end cap 40.
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Assemble back-up rings 24, buffer 15, spacing collar 39, spacer 13 and barrel nut 23, which MUST be set with a torque wrench
to 20 Nm (15 lb/ft), using the adaptor and the wrench.
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Lock barrel nut 23 with screw 25.
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Replace sleeve 60 or 65, tail jaw cylinder assembly 7, handle assembly 56 or manifold 69, as applicable.
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Clean and oil cursor 21 ensuring correct orientation when refitting into the front of barrel 59. If incorrectly fitted follow the
procedure on page 7.
* refers to items included in the Avdel service kit. For complete list see page 22.
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I M P O R T A N T
Check the tool against daily and weekly servicing.