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O R I G I N A L I N S T R U C T I O N
8. HYDRAULIC MODULE ASSEMBLY 70500-02000 - MAINTENANCE
8.1 DISMANTLING THE TAIL JAWS
With the aid of Spanners*, remove Adaptor 24 and "Tail Jaw Assembly" from Tail Jaw Housing 42. The Turret 22 and the
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Turret Jaws 19 will be exposed. Care should be taken not to misplace the Jaws.
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Clean and inspect Jaw Housing 45. It will be necessary to remove the Jaw Housing only if damaged. To remove the Jaw
Housing 45 use Jaw Housing Key* and Spanners.
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Clean all items, clean and replace as necessary. Regrease using Molylithium based grease.
8.2 DISMANTLING TAIL JAWS ASSEMBLY
Remove Adaptor 24 and Tail Jaws Assembly.
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Remove Adaptor 24 from Front Cylinder 44 using Spanner*. Remove Banjo 43 and 'O' Rings 9.
With the aid of Spanners* remove Turret 22 from Front Piston Rod 49.
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With the aid of Spanners* remove Front Cylinder 44 from Rear Cylinder 28. Remove Front Piston Rod 49 and Piston 26.
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Remove Circlip 16 and remove Piston 26 from Piston Rod 27. Remove 'O' Ring 4 from Front Cylinder 44.
Note: Removal of 'O' Rings from internal recesses requires the use of a pointed probe. Care must be taken not to damage
sealing surfaces. Remove 'O' Ring 8 from Piston. Remove 'O' Ring 10 from Piston using Spatula *.
Remove Seal Retainer 30, with the aid of spanner* remove Front Rear Cylinder 28 from Back Rear Cylinder 28. Remove
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Piston Rod 27, Circlip 16, Piston 26, and 'O' Ring Seals as described.
Remove Seal Retainer 30. With the aid of spanner * remove Back Rear Cylinder 28 from Rear Plug 29. Remove Seal
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Retainer 30.
Remove Piston Rod, Circlip, Piston and 'O' Ring Seals as described.
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Replace worn or damaged parts as required. Clean all parts thoroughly, lubricate Seals and Cylinder Bores with
Molylithium grease. Re-assemble in reverse order.
8.3 DISMANTLING HYDRAULIC BODY ASSEMBLY
Using Hexagon Wrench* remove Button Head Bleed Screws 1 and Seals 6 from Body 38. Allow hydraulic fluid to drain
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from Cylinder Body.
Using Hexagon Wrench* remove Barrel Assembly 2, 11, 13, 20, 21, 23, 25, 31, 32, 33, 34, 35, 36, 37.
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Using spanners* to prevent the Body 38 rotating, and with the aid of spanners* remove the Tail Jaw Housing 42 and Tail
Jaw Assembly.
With the aid of spanners* remove Locknut 46 and Piston Nut 47. Remove Buffer Stops 48.
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Note: It is important that the same number of Buffer Stops removed, are replaced on re-assembly.
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Remove Piston 41. Remove Hydraulic Seal 15 and Piston Guidance Tape 39, clean all parts thoroughly, inspect for
damage and replace if necessary.
Remove Hydraulic Seal 14 and Piston Guidance Tape 40 from Body 38, clean and inspect for damage and replace if
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necessary.
Note: Extreme care must be taken when removing Seals, to avoid damage to sealing surfaces.
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Inspect Piston diameters, and Body Cylinder bore, for wear and damage. Replace Hydraulic Seals and Piston Guidance
Tape in the correct relative positions. For Hydraulic Seals 14 use assembly tools*. Insert Seal in tapered end of Sleeve*.
Ensure seal is orientated correctly. Insert sleeve into bore of Body 38. Using Push Rod*, push Seal out of sleeve into
body groove. Lubricate Seals and Cylinder Bores with Molylithium grease.
8.4 RE-ASSEMBLING HYDRAULIC BODY
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Using Assembly Bullet*, positioned on the thread of Piston 41 and with the aid of Piston Assembly Rod*, push the
piston through the bore of the Body 38 until it reaches the shoulder of the Body, remove the Assembly Bullet*.
Assemble Buffer Stops 48, ensure the same number are assembled as were removed.
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* Refers to items included in the service kit, see page 16.
Item numbers in bold refer to the general assembly and parts list on pages 21-22.
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