Stanley AV 20 Instruction And Service Manual page 15

O R I G I N A L I N S T R U C T I O N
• Screw the *Piston Bullet - Front on to the front of the Piston 1.
• Place the Body 2 nose up on a bench. Then using a soft mallet, tap the Piston 1 towards the rear of the Body and out the
back end, taking care not to damage the bore within the Body.
• Note that when removing the Piston 1, oil on the pull side of the Piston will leak from the front and rear of the Body 2.
• When removing the Piston 1, the Front Seal Gland 16 may be retained on the Piston shaft. If this is the case, unscrew
the *Piston Bullet - Front and pull the Front Seal Gland off of the Piston.
• Using a small fl at screwdriver remove Piston Seal 31 and the two Anti-Extrusion Rings 32, from the external groove
on the Piston 1, and discard. When removing the seals, take care not to damage the surface of the Piston with the
screwdriver.
• If the Front Seal Gland 16 is still retained in the Body 2. Place the Body nose up on a bench and then push the Front Seal
Gland from the front until it is free from the recess within Body. The Front Seal Gland can then be removed from the
back end of the Body. Take care not to damage the bore within the Body when doing so.
• Using a small fl at screwdriver remove O-Ring 28 and Spiral Back-up Ring 27, from the external groove on the Front Seal
Gland 16, and discard. When removing the seals, take care not to damage the surface of the Front Seal Gland with the
screwdriver.
• Remove Rod Seal 30 and Wiper Seal 26, from the internal grooves on the Front Seal Gland 16, and discard. When
removing the seals, take care not to damage the surface of the Front Seal Gland with the screwdriver.
• Remove the Front Bearing Ring 29 and check the part for wear or damage. Discard if necessary.
• Using a small fl at screwdriver, remove O-Ring 25 from the Body 2 and discard.
• Remove the spare *Quick Coupler - Female from the Quick Coupler – Male 10 on the Hydraulic Hose – Pull 19.
• Do not remove Set Screw 36 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
assembly tools.
• Slide O-Ring 28 over the Front Seal Gland 16 and into the external groove. Insert the Spiral Back-up Ring 27 in the same
groove, in front of the installed O-Ring. Refer to the General Assembly and Parts List for the correct orientation of the
O-Ring and Spiral Back-up Ring.
• Press the Front Bearing Ring 29 into the internal recess within the Front Seal Gland 16 and then install Rod Seal
30 behind the Front Bearing Ring. Install the Wiper Seal 26 in the front recess of the Front Seal Gland. Refer to the
General Assembly to ensure the correct orientation of the Rod Seal and Wiper Seal.
• Lubricate the surface and leading edge of the Body 2 bore into which the Front Seal Gland 16 is to be installed with
Molykote ® 111 grease.
• Lubricate the spigot on the *Front Gland Guide Rod tool and then place the Front Seal Gland 16, Rod Seal 30 end fi rst,
fully over spigot.
• Insert *Front Gland Guide Rod into the rear of the Body 2 and then push the Front Seal Gland fully into the bore within
the Body. Reasonable force is required to insert Front Seal Gland into the Body, so the use of a press or vice may be
necessary. Remove the *Front Gland Guide Rod while ensuring that the Front Seal Gland stays in place.
• Lubricate the seal groove and major external diameter of the Piston 1 with Molykote
31 over the front of the major Piston diameter and into the seal groove. Install two Anti-Extrusion Rings 32 into the
Piston seal groove, one either side of the Piston Seal.
• Screw the *Piston Bullet - Front on to the front of the Piston 1. Lubricate the *Piston Bullet - Front, Piston shaft and
Piston Seal 31 with Molykote
• Screw the *Piston Guide Sleeve fully into the rear of the Body 2. Lubricate the bores in both the Body and the *Piston
Guide Sleeve with Molykote
• Connect the spare *Quick Coupler - Female to the Quick Coupler - Male 10 on the Hydraulic Hose – Pull 19. This will
allow air to be released from the pull side Piston 1 when inserting the Piston.
• Insert the assembled Piston 1 into the rear of the Body 2 and through the assembled Front Seal Gland 16. Push the
Piston into the fully forward position until it stops against the Front Seal Gland. Hydraulic oil will be expelled from the
Hydraulic Hose – Pull 19.
®
®
111 grease.
® 111 grease.
111 grease to all seals, seal grooves, back-up rings and the
® 111 grease. Slide the Piston Seal
E N G L I S H
15