Stanley AV50 Instruction And Service Manual page 14

E N G L I S H
the Piston. Screw the Collet Adapter 40 on to the Piston 1 until the front face is flush with the end of the Piston. Align the
hole in the Collet Adapter with the slot in the end of the Piston and then insert Locking Pin 41. Refer to the illustration
below for the correct assembly of the *Piston Extraction Tools.
Piston Extractor
Piston Extractor
Piston Extrac on
Piston Extraction Rod
• Using a 55 mm spanner, unscrew the *Piston Extraction Rod from the *Piston Extractor - this will slowly pull the Piston 1
from the bore of the Body 2. Continue to unscrew the *Piston Extraction Rod until the Piston is pulled to stop against the
front face of the *Piston Extractor. Lift and remove the *Piston Extraction Tools together with the Piston from the front of
the Body.
• Remove the Pin 41 and Collet Adapter 40 from the Piston 1, enabling the Piston to be removed from the Piston
Extraction Tools.
• Remove the Valve Rod 16 from the Piston 1 and check the part for wear or damage. Replace if necessary.
• Remove the placing tool from the vice and empty the hydraulic oil from the tool. Remove the spare *Quick Coupler –
Male from the Quick Coupler - Female 11.
• The Piston Seal 26 is a two-piece seal consisting of an external sealing ring and an inner o-ring. Using a small knife,
cut through the external sealing ring and remove from the external groove on the Piston 1. Then using a small flat
screwdriver remove the inner o-ring from the Piston, and discard. When removing the seals, take care not to damage the
surface of the Piston.
• Do not remove Set Screw 42 from the Body 2.
Assemble in reverse order to dismantling noting the following points:
• Clean all components before assembling.
• To aid assembly of seals apply a light coating of Molykote® 111 grease to all seals, seal grooves, back-up rings and the
assembly tools.
• Lubricate the seal groove and major external diameter of the Piston 1 with Molykote® 111 grease. Slide the inner O-ring
from Piston Seal 26 over the front of the major Piston diameter and into the seal groove.
• Screw the *Piston Bullet on to the Piston 1. Place the *Piston Seal Sleeve over the Piston shaft and then place the outer
sealing ring from Piston Seal 26 over the *Piston Seal Sleeve so that it rests on the tapered diameter. Lubricate the
surface of the *Piston Seal Sleeve with Molykote® 111 grease.
• Place the *Piston Seal Plunger over the Piston 1 shaft and the *Piston Seal Sleeve so that the open end of the *Piston
Seal Plunger rests on the outer sealing ring of Piston Seal 26. Using the *Piston Seal Plunger, push the outer sealing ring
over the *Piston Seal Sleeve and into the Piston seal groove. Reasonable force is required to expand and insert the outer
sealing ring on the Piston, so the use of a press or vice is necessary.
• Remove the *Piston Seal Plunger and the *Piston Seal Sleeve from the Piston 1. Lubricate the *Piston Bullet - Front, Piston
shaft and Piston Seal 26 with Molykote® 111 grease.
• Clamp the tool body in a vice with soft jaws so that the tool is pointing nose up.
• Fill the rear of the Body 2 with Enerpac® HF hydraulic oil to a depth of approximately 30 mm.
• Apply a light coating of Molykote® 111 grease to leading edges and bore within the Body 2 and to the Piston Seal 26.
• Place the Piston 1 in the front of the Body 2, so that the rear edge of Piston Seal 26 rests on the leading edge of the main
bore within the Body. When inserting the Piston the take care not to damage the Piston Seal on the threads at the front
end of the Body.
All numbers in bold refer to the General Assembly and Parts List on pages 17, 18 and 19.
* Service Kit on page 12.
14
Rod
O R I G I N A L I N S T R U C T I O N
Piston Extrac on
Piston Extraction Sleeve
Sleeve