Specifications
5
www.milleruidpower.com
Miller Fluid Power
Des Plaines, IL
Milton, Ontario Canada
STEPPED CUSHIONS
CAP END PLUNGER
ROD END PLUNGER
High Strength Tie Rods
– Made from 100,000 PSI
minimum yield steel with
rolled threads for
added strength.
Adjustable Floating Stepped Cushions –
For maximum performance – economical
and exible for even the most demanding
applications – provides superior performance
in reducing shock. Cushions are optional and
can be supplied at head end, cap end, or
both ends without change in envelope or
mounting dimensions.
The Cylinder Tube
– Heavy-wall steel
tubing, honed to a
micro nish bore.
Piston Rod – Medium
carbon steel, induction
case-hardened, hard
chrome-plated and
polished to 10 RMS
nish.
Ports – S.A. E. “O”-ring
ports are standard
One-Piece Nodular Iron
Piston – The wide piston
surface contacting cylinder
bore reduces bearing loads.
Anaerobic adhesive is used to
permanently lock and seal the
piston to the rod.
Steel Cap – Bored and
grooved to provide
concentricity for mating parts.
OPTIONAL PORTS
Ports – N.P.T.F. ports
are optional at no extra
charge. Oversize N.P.T.F.
and S.A.E. ports are
available at extra charge.
Hi Load Piston – Optional at
extra charge. Includes wear
rings and bronze-lled PTFE
seals. Two wear rings serve
as bearings which deform
radially under side-loading,
enabling the load to be
spread over a larger area
and reduce unit loading.
Bronze-lled PTFE seals are
designed for extrusion-free,
leak-proof service and longer
cylinder life than the lipseal
type piston. Not available
with retainer nut.
(1) When a cushion is specied at the head end:
a
. A self-centering stepped plunger is furnished on the piston rod assembly.
b. A needle valve is provided that is ush with the side of the head even
when wide open. It may be identied by the fact that it is socket-keyed.
It is located on side number 2, in all models except 67, 68, 81, 82, 87 and
89. In these models it is located on side number 3.
c.
On 6.00" bore and larger cylinders, a springless check valve is provided
that is also ush with the side of the head and is mounted adjacent to the
needle valve except on model 72, where it is mounted opposite the
needle valve. It may be identied by the fact that it is slotted.
d. On 1.50" - 5.00" bore cylinders a slotted sleeve design is used in place of
the check valve.
e. 1.50" - 2.50" bore cylinders use cartridge style needle valve (see Figure A).
OPTIONAL PISTONS
(2) When a cushion is specied at the cap end:
a. A stepped plunger is provided on the piston rod.
b. A “oat check” self-centering bushing is provided which incorporates a
large ow check valve for fast “out-stroke” action.
c. A socket-keyed needle valve is provided that is ush with the side of
the cap when wide open. It is located on side number 2 in all models
except 67, 68, 81, 82, 87 and 89. In these models it is located on side
number 3.
Figure A
Step cut iron piston rings
are optional.
Lipseal
®
Piston – Zero leakage
under static conditions for
hydraulic pressures up to 3000
PSI. Seals are self-compensating
to conform to variations in
pressure, mechanical deection,
and wear. Back-up washer
prevents extrusion.
Spring Loaded PTFE
Piston Seals
Optional lled PTFE piston
Lipseals utilize an internal
stainless steel spring to
energize both the dynamic
and static sealing lips to
optimize seal performance
throughout the operating
temperature range. Non-
metallic piston wear ring in
1.50"-6.00" bores (bronze in
7.00" & 8.00" bores) reduces
possibility of damaging
piston which can score
expensive tubing. Combine
with High Temperature
Bushing for cylinder heat
resistance to 400° F. See
class 8 seal specication
on Operating Fluids and
Temperature Range page.
FILLED
PTFE
BEARINGS
SYNTHETIC RUBBER
EXPANDER RINGS
BRONZE
FILLED PTFE
RINGS