Stanley 734 AV Series Instruction And Service Manual page 15

ENGLISH
will release any pressure from the pull side of the Piston 18 and ease the removal of the Piston. Note: Hydraulic
oil will be expelled from the spare quick coupler – female.
Screw the *Piston Bullet - Front on to the front of the Piston 18.
Place the Body 1 nose up on a bench. Then using a soft mallet, tap the Piston 18 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 18, oil on the pull side of the Piston 18 will leak from the front and rear of
the Body 1.
When removing the Piston 18, the Front Seal Gland 17 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 35 and the two Anti-Extrusion Rings 34, from the external
groove on the Piston 18, and discard. When removing the seals, take care not to damage the surface of the
Piston with the screwdriver.
If the Front Seal Gland 17 is still retained in the Body 1. 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 38 and Spiral Back-up Ring 39, from the external groove on the
Front Seal Gland 17, and discard. When removing the seals, take care not to damage the surface of the Front
Seal Gland with the screwdriver.
Remove Rod Seal 36 and Wiper Seal 40, from the internal grooves on the Front Seal Gland 17, 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 37 and check the part for wear or damage. Discard if necessary.
Remove the spare *Quick Coupler - Female from the Quick Coupler - Male 9 on the Hydraulic Hose - Pull 25.
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.
Slide O-Ring 38 over the Front Seal Gland 17 and into the external groove. Insert the Spiral Back-up Ring 39 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 36 into the internal recess within the Front Seal Gland 17 and then install Rod Seal
36 behind the Front Bearing Ring. Install the Wiper Seal 40 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 17 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 17, Rod Seal 36
end fi rst, fully over spigot. Insert *Front Gland Guide Rod into the rear of the Body 1 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 18 with Molykote® 111 grease. Slide the
Piston Seal 35 over the front of the major Piston diameter and into the seal groove. Install two Anti-Extrusion
Rings 34 into the Piston seal groove, one either side of the Piston Seal.
Screw the *Piston Bullet - Front onto the front of the Piston 18. Lubricate the *Piston Bullet - Front, Piston shaft
and Piston Seal 35 with Molykote® 111 grease.
All numbers in bold refer to the General Assembly and Parts List on pages 18, 19 and 20.
* Service Kit on page 13
14
ORIGINAL INSTRUCTION