12
Parker Hannifin
Cylinder and Accumulator Division Europe
Maintenance Bulletin
'Mill Type' Cylinders
MA3 Series
Cylinder Assembly
Figs. 1-7
The cylinder should be reassembled as follows:
1
If the cylinder cap/body joint has been removed (see 'Remo-
val', page 10), the body O-ring back-up washer (47), followed
by the body O-ring (26), should be lightly oiled and pressed into
the groove in the cap, without twisting.
2
Fit the cylinder body, complete with piston and rod, to the
cap by 'rocking' it down over the O-ring until the body is in
contact with the cap.
3
Insert the hex socket-headed cap screws (23) from the
inner side of the retaining flange (19) and tighten in a diagonal
sequence to the appropriate torque figure, shown in the table
on page 6.
4
When fitting the head/gland assembly over the rod thread,a
slight rotary motion will help prevent damage to the seals. In
addition, shim stock or similar thin, tough material should be
wrapped around the threads to protect the seal lips.
5
Lubricate the cylinder body O-ring (26) and back-up washer
(47) and fit the back-up washer, followed by the O-ring, to the
head/gland assembly.
6
Lubricate the gland and seals and, taking care not to damage
the seal lips, slide the head/gland assembly over the threaded
end of the piston rod. Slide the head/gland assembly along
the piston rod into contact with the cylinder body and, using a
soft-faced hammer, tap around the edge of the head assembly
until the body and head are in metal-to-metal contact. Insert the
hex socket-headed cap screws (23) from the inner side of the
retaining flange (19) and tighten in a diagonal sequence to the
appropriate torque figure, shown in the table on page 4.
7
If the gland seals have been serviced, the gland assembly
will be hand tight in the head. Tighten the gland cartridge firmly
against the head, using the face-type pin wrench. Bolted glands
should be tightened to the appropriate torque figure, as shown
in the table on page 7.
Storage
If the cylinder is to be stored before use, the following precauti-
ons should be taken.
1
Cylinders should be stored in an upright position, with the
piston rod end uppermost.
2
A vapour phase inhibitor should be introduced through both
ports. The cylinder should be thoroughly flushed with clean
system fluid before being put into use.
Before first use, all seals should be replaced if the cylinder has
been in storage for more than five years.
