Dake Movable Table - Elecdraulic I /42 series 400's - Manual (Page 3)

Model 42-403 05/10 3
CAUTION : 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.
3. The handle on the left side of the workhead (item 67 on workhead parts list) opens and closes the
ball valve, which releases pressure on the ram. This valve should be kept firmly closed and open
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 handle (items 86 & 91 on the work head parts list) on the right side of the panel
regulates the speed of ram travel. The handle will return to the off position when released. It is not
necessary to stop motor after each operation.
6. The relief valve (item 79 on the workhead parts list) 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 looses pressure:
a. Check all tubing joints for leaks and tighten the tube nuts.
b. Leakage past release valve (Item 67). Drain the reservoir, and remove packing nut (Item 75),
valve rod (Item No 64), and ball valve (Item No 63). 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 No. 60). Drain reservoir, remove large pipe plug
(Item No. 62), valve seat (Item No. 61), and check ball (Item No. 60). 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 No. 123). 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 52) is installed in the side
of the piston. If not, insert ½”-13 stud or cap screw 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.
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 75), which governs the pressure at which the valve will bypass oil, is adjusted by turning
the screw (Item 79) in to increase pressure or out to decrease pressure. Replace seal (Item
74) and cap nut (Item 78). NOTE: We advise that the relief valve not be tampered with
after it is set at the capacity of the press.
3. If nothing happens when press is operated.
a. If motor does not run, the electrical circuit should be investigated.