8
Parker Hannifin
Cylinder and Accumulator Division Europe
Maintenance Bulletin
'Mill Type' Cylinders
MA3 Series
Removal
Standard Gland & Seals, Fig. 2
Fig. 1
Low Friction Gland & Seals, Fig. 3
40
41
14a
134
124
45
123
140b
140a
55
127
125
126
46
127
123
141a
141b
40
14a
134
45
132
46
55
133
131
133
Chevron Gland & Seals, Fig. 4
134
136
14b
45
27
139a
138
137
139b
40
Standard and Low Friction Glands Figs. 1, 2 & 3
The Standard or Low Friction gland seals are housed within
a Parker rod gland. On bore sizes up to 100mm the gland is
screwed to the head. On larger bore sizes the gland is bolted.
1
Inspect the piston rod to make sure it is free from burrs or
damage which would prevent the gland sliding off the rod.
2
Unscrew or unbolt the gland using a gland wrench and spanner,
and slide the gland off the piston rod.
3
Remove the seals and wear rings, taking care not to damage
the gland.
4
Clean and inspect the gland bore and seal grooves. If any wear
is present, replace with an RGN or RGF rod seals and gland kit
containing seals of the correct group for the conditions – see
table. If the gland shows no signs of wear, an RKN or RKF rod
seal kit may be fitted.
Chevron Glands Figs. 1 & 4
The gland seals and wear rings are housed within a two-piece
removable gland, whose retainer (27) is threaded or secured
by screws to the head of the cylinder, clamping the gland
(14b) in place as shown. The wiper seal and a wear ring are
housed in the retainer, while the gland houses two further wear
rings and the chevron seals and their back-up washer.
Cylinders with bore sizes up to 100mm diameter are fitted with
a threaded gland retainer, while bore sizes of 125mm diameter
and above employ a retainer secured by screws (136).
1
Inspect the piston rod to make sure it is free from burrs or
damage which would prevent the gland sliding off the rod.
2
Unscrew or unbolt the gland retainer (27) and slide it off the
piston rod. The gland (14b) will remain on the piston rod and must
be removed separately. The gland has an external thread, as
shown in the table opposite, which can be used in conjunction
with a suitable puller to remove the gland complete with back-
up washers and chevron seals. Alternatively, the head port may
be pressurized using fluid from a hand pump, forcing the gland
bearing forward sufficiently to enable it to be withdrawn.
Never try
to remove the gland by applying compressed air to the opposite
end.
3
Taking care not to damage the gland retainer, remove the
wiperseal and wear ring from the retainer. Noting the order in
which they are removed to assist in reassembly, remove the
chevron seal components and wear rings from the gland. Clean
and inspect the gland bore and grooves. If any wear is present,
replace with an RGLL rod seals and gland kit containing seals of
the correct group for the conditions – see table. If the gland shows
no signs of wear, an RKLL rod seal kit may be fitted.
35
34
36
37
18
17 17a
17b
23
7
40
41
70a
69a
19
15
19
14b
14a
70a
69a
1
45
134
26
23
74
73
47
26
27
47
