Dake 906425 User Manual

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INSTRUCTIONS AND PARTS LIST FOR

Models 6-225, 6-425, 6-250, 6-450,

6-275, 6-475, 6-650, and 6-850

Air Hydraulic Presses

WARNING LABELS

To the left is the safety Alert symbol. When you see these safety alert symbols on your press,

be alert to the potential for personal injury.

Follow recommended precautions and safe operating practices.

SETTING UP THE PRESS FOR OPERATION

For shipping convenience, some of the parts are not assembled. Assemble these parts in the following order:

1. Bolt the base angles to uprights using four bolts and nuts, which are provided. Make sure base
angles are against stops on uprights.

NOTE: The press should set on a level floor with the base angles touching the floor at all
points. Use shims where necessary.

2. Connect airline into street elbow (Item No. 136) at right hand side of control block.

NOTE: Avoid restrictions in air supply line to insure ample air-to-air motor. To ensure
maximum performance the air supply line should be ½” pipe line if the distance from the
compressor to press is 0-30 feet, ¾” line 30-60 feet, and 1” if greater than 60 feet.
NOTE: AIR MUST BE MOISTURE FREE. WATER IN AIR LINE WILL CORRODE THIS PRESS
BEYOND REPAIR.

3. Oil Requirements: Fill reservoir with Mobil DTE 24 or equivalent oil thru pipeline in back of press at
pipe coupling by removing pipe plug. NOTE: Make sure the air-source is removed from the

reservoir prior to removal of plug. Oil level may be checked (with ram up) by removing the
pipe plug on the right side of reservoir near the front. Replace plug before operating the press.

Model 6-225 & 6-425 25-ton presses use 6 quarts

Model 6-250 & 6-450 50-ton presses use 8 quarts
Model 6-275 & 6-475 75-ton presses use 10 quarts
Model 6-650 & 6-850 150-ton presses use 20 quarts.

4. Attach nose piece to ram by inserting shank into ram and tightening the set screw.

5. CAUTION! Place the hoist crank on the lift drum shaft. Turn the hoist crank to relieve

the pressure on the table pins. Keeping tension on the hoist crank, remove the table pins one
at a time. After removing the tables pins, turn the crank running the table channels from top to
bottom. Check to make sure the cable is tracking correctly. The cable should be on each of
the two upper pulleys and should track back and forth on the cable drum. Always place table
pins under the table channels before releasing the hoist crank when positioning the table
channels for cable tracking, servicing, or set-up for desired work opening. If a tracking
problem exists, contact the Dake factory for instructions. Be sure all table pins are fully
inserted in place before applying pressure. Always remove or release pressure on the cable
before pressure is applied.

Optional Equipment

Remote relief valve- part number 713510.

Model 6-225, 6-425, 6-250, 6-450,
6-275, 6-475, 6-650, & 6-850

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OPERATIONS

WARNING: DO NOT OVERSTROKE THE RAM. Overstroking will cause premature seal failure. Models

6-225, 6-425, 6-250, 6-275 and 6-475 have a 10-inch stroke. Models 6-650 and 6-850 have a 16-inch
stroke.

The press has been completely tested at the factory and after setting up according to instructions above, the
press is ready for operation. However, it is necessary for the operator to acquaint themselves with the
controls.

1. Three screws (item 109) are used to lock the workhead in the desired position along head
channels.

2. The handcrank (item 19) is provided to raise or lower the table channels to the proper work height.
When desired height is obtained insert the table pins. Models 6-225, 6-425, 6-250 and 6-450 use 2
pins on each side (4 total) and Models 6-275, 6-475, 6-650 and 6-850 use 3 pins on each side (6
total). NOTE: Be sure ALL table pins are in place an in as far as they can go before pressure

is applied. Be sure to slack off on the cable before pressure is applied. (Refer to point 5
under SETTING UPS THE PRESS FOR OPERATION)

3. The handle on the left side of the control block (item 76) opens and closes the ball valve, which
releases pressure on the ram. This valve should be kept firmly closed and opened only when it is
desired to return the ram to its up position.

4. The two table plates and two V-blocks are used for supporting the work in process.

5. The control knob (item 103) on the right side of the panel regulates the speed of ram travel. The
knob will return to the off position when released.

6. The relief valve (item 90) has been set at factory to open at maximum tonnage of press. The valve
can be adjusted by removing hex nut located on top of the valve block at the right front of reservoir
and turning the adjusting screw to the left for a lower setting. WARNING: Never exceed rated

tonnage of press.

MAINTENANCE

CAUTION: When disconnecting any parts of this machine be extremely careful that all parts are clean
to prevent entrance of dirt in the hydraulic system.

1. If press loses Pressure:

a. Check all tubing joints for leaks and tighten the tube nuts.
b. Leakage past release valve (Item 72). Drain the reservoir, and remove packing nut (Item75),

valve rod (Item 73), and ball valve (Item 72). Clean out valve seat and reseat ball valve using
brass rod as a drift striking sharply with a hammer. Reassemble valve rod, packing and packing
nut. Refill reservoir with appropriate oil amount.

c. Leakage past eductor inlet check ball (Item 69). Drain reservoir, remove large pipe plug (Item

71), valve seat (Item 70), and check ball (Item 69). Clean and inspect seat. Reseat ball on seat
or replace seat with a new one if necessary. Reassemble with ball above the seat tightening
plugs securely.

d. Worn cup leather (Serial No < 192522) or T-ring seal (Serial No > 192523). If none of the

previous conditions seem to have been the cause of the trouble, the cup leather or T-ring seal
may be worn out or damaged. To inspect this it is necessary to drain the oil and remove the
workhead from the press frame. Remove tube assembly (Item 144). Set 2 4x4 blocks on the
table then raise table channels with the block up to the bottom of the reservoir applying pressure
to the reservoir. Remove roller brackets from the reservoir and lower workhead using the table.

WARNING: Be sure that stroke indicator rod support (item 61) is installed in the side of
the piston. If not, Insert ½”-13 stud or capscrew in tapped hole in piston. This will hold
the piston down under spring pressure. Next remove nuts from cylinder flange and lift

Model 6-225, 6-425, 6-250, 6-450,
6-275, 6-475, 6-650, & 6-850

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cylinder off piston. The piston leather or T-ring seal can now be inspected and replaced if
necessary. Press may be reassembled in reverse order being careful not to damage the lip of
the leather cup or T-ring seal as it enters the cylinder.

2. If press will not develop rated tonnage.

a. Dirt under valve balls. Refer to MAINTENANCE 1 – c above.
b. Worn cup leather. Refer to MAINTENANCE 1 – d above.
c. Relief valve not set properly. This valve is located on the top side near the right end of the

control block at the front of the reservoir. The valve is set at the factory to bypass oil from the
pump back to the reservoir when the press reaches its rated capacity. The load on the spring
(Item 91), which governs the pressure at which the valve will bypass oil, is adjusted by turning
the screw (Item 90) in to increase pressure or out to decrease pressure. Replace seal (Item

89) and cap nut (Item 88). NOTE: We advise that the relief valve not be tampered with
after it is once set at the capacity of the press.

3. If nothing happens when press is operated.

a. Release valve open. Be sure to have release valve firmly closed when using press.
b. If the ram will come down only a fraction of its rated stroke, check the oil level in the reservoir

with the ram at the top of its stroke. It should be visible in the sight window at the side of the
reservoir.

4. If press is operating slow.

a. Check air supply line for restrictions to determine if air motors are getting ample supply of air.
b. Release valve not closed properly. Release valve must be firmly closed when using the press.
c. Wrong hydraulic fluid. After considerable research and tests made with the cooperation of the

pump manufacturer, we recommend Mobil DTE 24 oil or equivalent.

5. If Oil is coming out of the air vent.

Drain out the spring chamber by removing the 1/8” pipe plug, which is put in the hub or boss that
contains the oil seal where the ram extends out of the reservoir. Once oil is drained, run the press up
to full tonnage with pipe plug still out. Excessive oil is a sign that the head seal has been damaged.
Refer to Maintenance section 1 item d to replace seal. Replace pipe plug.

6. Excessive leakage around the ram.

Drain out the spring chamber as instructed in Maintenance section 5. A small amount of oil in this
chamber facilitates lubricating the bushing the ram passes thru and prevents scoring. However, if
operation performed on press is spoiled due to slight leakage of oil, remove pipe plug as described in
MAINTENANCE 5 and connect tube line to continually drain this chamber.

Model 6-225, 6-425, 6-250, 6-450,
6-275, 6-475, 6-650, & 6-850

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WARNING LABELS

Label 300168

Label 84487

Label 84399

Label 84395

Label

76462

Label 7355

To the left is the safety Alert symbol. When you see these safety alert symbols on your press,

be alert to the potential for personal injury.

Follow recommended precautions and safe operating practices.
Carefully read all safety messages in these instructions and on your press safety signs.

Keep safety labels in good condition. Replace missing or damaged safety labels. This machine is intended
to be operated by one person. This person should be conscious of the press ram movement not only for

himself but also for persons in the immediate area of the machine.

Label Placement View

Model 6-225, 6-425, 6-250, 6-450,
6-275, 6-475, 6-650, & 6-850