Dixon 25 TON RAM User Manual SEC07

25 Ton Ram Operating Instructions

Section 7

Internal Expansion of

Holedall H-520 Series Couplings

Dixon Valve & Coupling Company

800 High Street • Chestertown, MD 21620

ph: 800•355•1991 fax: 800•283•4966

www.dixonvalve.com

25 Ton Ram Instruction Manual Internal Expansion of H-520 Couplings

Before you begin, make sure the Ram is fully retracted.
Install the Holedall Petroleum Thrust Plate Adapter
(25ROSTPA) to the end of the 25IXATTACH with set screws.
Select the proper Pull Rod.

For 5/8” and 3/4” use 25ROSTROD screwed together
with 25ROSTADP.
For 1” thru 1-1/2” use 25RODSMALL.
For 2” thru 4” use 25RODLARGE.

Screw the short threaded end of the rod into the face plate of
the 25IXATTACH.

Note: Picture shows 25RODLARGE.

Select the corresponding Thrust Plate for the size fitting that
you are installing. Assuring that the recess is facing outward
towards the operator, slide the Thrust Plate over the Pull Rod
until it reaches the 25ROSTPA. Align the holes in the Thrust
Plate over the pins. Tighten the wing nut to lock it in place.

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2

Slide the stem over the Pull Rod and into the recess of the
Thrust Plate with the connection side of the stem facing the
ram. For male stems, insert the hex into the recess of the
Thrust Plate. For female stems, insert the first hex into the
Thrust Plate so that it goes all the way through, so that the
second hex will fit into the recess of the Thrust Plate.

Note: There is no need to lubricate the plug or stem. The

stems are pre-lubricated at the factory.

Screw (or slide) the IX plug, small end first, onto the Pull Rod
and into the shank of the stem. For 2” and above screw the
retaining nut on until it contacts the plug. Move the stem
slightly to allow for slack and hand tighten the plug or nut
until it is snug.

Hint: When doing more than 1 hose assembly of the same ID

size take the time to screw the Pull Rod further into the face
plate of the 25IXATTACH. This will allow for a shorter
cycle time.

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customer service 800•355•1991

1Section 7

25 Ton Ram Instruction Manual Internal Expansion of H-520 Couplings

Accurately measure the hose O.D. with a diameter tape.
Select the correct Holedall Petroleum Ferrule from the DPL
based upon the hose O.D. just measured.

Note: Always measure both ends of the hose for accurate

ferrule selection.

Make sure the hose end is cut square. Measure and
mark the hose in accordance with the provided Insertion
Dimension chart (see page 3). This will ensure that the
proper rubber displacement “pocket” is maintained when
proceeding to Step 7.

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6

Ensuring that the end of the ferrule is aligned with the mark
from Step 6, slide the hose with ferrule over the shank until
the ferrule contacts the shoulder of the stem. Check to see if
the proper pocket is maintained.

Important! If there is an insufficient pocket for the rubber to

displace into, damage may occur to the stem, ferrule and/or
hose.

While holding the hose and the ferrule firmly against the stem shoulder,
engage the Ram by stepping on the foot pedal, or depressing the “ON”
button on the remote control. The internal expansion operation is
complete when the hose and stem assembly is pushed completely over
the internal expansion plug. Release the foot pedal or “ON” switch.

Note: If the gauge reads 10,000 PSI before internal expansion is

complete, stop. Contact Dixon for further assistance.

During internal expansion never stand directly in front of the
Ram. Visually inspect the coupling and clean excess lubricant from the

stem ID. Dixon Valve and Coupling Company recommends that all
hose assemblies be tested as recommended by the Rubber Manufacturers
Association.

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customer service 800•355•1991

2Section 7

25 Ton Ram Instruction Manual Internal Expansion of H-520 Couplings

Insertion Dimensions for Rostra Fittings

Ferrule Sizes Insertion Length

1"...........................................................25/32"

1¼"........................................................25/32"

1-3/8" ....................................................25/32"

1½"...................................................... 1-1/32"

2"....................................................... 1-19/32"

2½"........................................................ 2-1/4"

3"........................................................... 2-3/4"

4"......................................................... 3-7/32"

INSERTION LENGTH

FERRULE

customer service 800•355•1991

3Section 7