Regulator
• Unwind Pressure Switch 30 to its full extent.
Using a 2mm Hexagonal Wrench unscrew Screw 74 remove Pressure Switch 30 Regulator Lock 31, Spring
32 and Locking Bearing 33.
• Using a 14mm Spanner unscrew the Pressure Catch 28 the Regulator 29 should then be unscrewed
from the Pressure Catch 28 once withdrawn.
• Remove Spring 34 and Spring Guide 27.
• Using Pliers gently clamp onto the Pressure Rod 25 and Pull this will remove the Pressure Rod 25 and
Pressure Rod Sleeve 26 remove O Ring 66, 68.
• Remove Spool Valve 24, remove O Ring 65.
• Remove Lip Seal 54, to re-insert this seal use Seal Guide
Nose Equipment
• Using a 19mm Spanner unscrew Nose Casing 13.
• Retract the Nose Rod 73 and remove the Chuck Nut 14 by hand.
Using a 14mm Spanner and the 4mm Push Pin undo the Mandrel Adaptor 15 from the Locking Nut
17 and remove both items.
Head Assembly
• Using a 2mm Hexagonal Wrench unscrew Screws 74 and remove End Cap Assembly 20.
• Using a 2.5mm Hexagonal Wrench unscrew Screws 43 and remove Distributor Assembly 21, Ball 42 and Air
Tubes 44
• Fully unscrew Stroke Adjuster 19 and withdraw Spring 41.
• Remove Air motor assembly M, Drive pin 18B, Washer 18C, Hydraulic piston 18A. Remove Lip seal 72 and
O-ring 70.
• Some residual oil may be expelled when the Hydraulic Piston 18A is removed.
• Remove Static Lip Seal 40.
• To reassemble, use Assembly Bullet to mask Piston Rod 18B thread.
Manual Reverse Switch
• Remove Manual Reverse Screw 23.
• Withdraw Manual Reverse Switch 22, remove O-ring 64, 63.
Sub-Assemblies contained in Base Tool 74202-shown in exploded view
19
ENGLISH
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