Avdel 74201 Betriebsanleitung Seite 37

M a i n t e n a n c e
D i f f e r e n t i a l Va l v e
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Using special flat spanner* unscrew Adaptor Nut 58, withdraw and remove Spring 54 and 'O' Ring 55.
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Remove Threaded Pin 50 and Deflector 49.
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Using a spanner* remove Silencer 59 and nylon Washer 51.
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Push Valve Piston 57 out from its housing together with 'O' Rings 56, 53 and 52.
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Check 'O' Rings 56, 55, 53 and 52 for damage, Spring 54 for distortion and renew if required.
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Assemble in reverse order of dismantling.
H e a d A s s e m b l y
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Remove Nose Casing 1, Adaptor Nut 2 and 'O' Ring 4.
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Using spanners* remove Spindle Connector 3 and Lock Nut 6.
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Using circlip pliers* remove Circlip 11 and Washer 99.
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Remove 'O' Ring 4.
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Renew any damaged seals.
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Assemble in reverse order of dismantling.
R e a r C a s i n g
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Using an Allen key* remove two Screws 33 securing Rear Casing 26 and remove.
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Remove Silencer 25 from inside rear casing.
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Assembly in reverse order of dismantling.
D i s t r i b u t o r
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Using an Allen key* remove two Screws 7.
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Withdraw Distributor 27 together with Ball 18, Pushrod 17 and Spring 15, taking care not to drop Ball 18.
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Hold Distributor 27 in soft jaw vice and using circlip pliers remove Circlip 21.
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Remove Silencer 23 and Spring 22.
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Pull out Piston 29 together with three 'O' Rings 28.
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Using an Allen key* remove four countersunk socket head Screws 19 and withdraw Stroke Stop 16.
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Pull out two Air Supply Tubes 32 and four 'O' Rings 31.
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Renew any damaged seals.
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Assemble in reverse order of dismantling.
H y d r a u l i c P i s t o n a n d A i r M o t o r A s s e m b l y ( 7 4 2 0 0 - 1 2 6 1 0 )
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Wrap adhesive tape around Hydraulic Piston 14 thread and move assembly backwards slowly and firmly.
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Using circlip pliers* remove Circlip 11 and Front Seal 8.
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Using two spanners* separate the Hydraulic Piston 14 from Air Motor Casing 24. Shim Adjustment Ring 34, Movement Pivot 5, 'O Ring
13 and Lip Seal 12 will come out with Hydraulic Piston 14.
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Remove 'O' Ring 13 and Lip Seal 12.
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Remove air motor assembly out of Air Motor Casing 24, using circlip pliers*remove Circlip 107, then tap Air Motor Casing 24 on bench to
free components.
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Parts 100 to 113 (not including Circlip 107) can be pulled out as an assembly, taking care not to drop Pin 106.
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Remove Bearing 108, Planet Gear Spindle 100, three Planets 101, Planet Gear 109 and Spacer 102.
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Using a soft mallet tap splined head of Rotor 111.
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Bearing 110 and Front End Plate 103 will come out with Stator 104 and five Rotor Blades 105. (Rotor 111 remains in place).
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Place Rear End Plate 112 in vice with soft jaws.
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Using a pin punch* tap centre of Rotor 111 to remove Bearing 113. (turn Rotor 111 upside down and Bearing 113 will come out).
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When assembling air motor, rear side of Rotor 111 must just touch Rear End Plate 112 without any axial gap, (any existing gap will
disappear when Bearing 113 is fully located).
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When inserting air motor into Air Motor Casing 24 carefully align parts so that Pin 106 locates in centre hole between spin on/off ports of
Stator 104 and Rear End Plate 112.
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When assembling Hydraulic Piston 14 onto air motor assembly, tighten parts by hand and blow air into one of the outer ports of air Motor
Casing 24, checking to see air motor rotates freely.
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When assembling front Lip Seal 12 ensure larger diameter faces rear of tool.
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Renew any damaged seals.
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Assemble in reverse order to dismantling.
P r e s s u r e S w i t c h R e m o v a l
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See page 16.
Priming is ALWAYS necessary after the tool has been dismantled and prior to operating
* Refers to items included in the 74200 Service Kit. For complete list see page 11.
Item numbers in bold refer to the General Assembly drawing and Parts List (pages 14-15).
I M P O R T A N T
Check the tool against daily and weekly servicing.
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