Dake Air Draulic - 906 series - Manual (Page 2)

Model 6-225, 6-425, 6-250, 6-450,
6-275, 6-475, 6-650, & 6-850
2
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
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.