Dake Movable Table - Elecdraulic II /42 series 500's - Manual (Page 3)

Model 42-403 05/10 3
2. The two table plates and two V-blocks are used for supporting the work in process.
3. Directional control valve is located on the right side of the press. This controls the diredtion of the
ram travel. There are three positions: Neutral (handle straight out), Ram down (handle pulled
down), Ram up (handle raised). The handle will return as soon as released by operator.
CAUTION: When first starting press after setting it up, run the ram up an down a few times to
work air out of the tube lines before putting pressure on ram. Avoid building pressure at the top
and bottom of the stroke.
4. The relief valve is located in the directional control valve block. It has been set at factory to open at
maximum tonnage of press. This setting should not be changed.
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. Trouble shoot Throttling 4 way valve.
c. Worn T-ring piston seal. If none of the previous conditions seem to havn been the cause of
pressure loss, the T-ring piston seal may be worn or damaged. To inspect this, it is necessary to
remove the work head assembly from the frame. Insert rod into the hole on piston guid and
unscrew from cylinder. Remove piston from cylinder. The T-ring seal can now be inspected and
replaced if necessary. Also at this time, inspection of rod seal and O-ring seal is recommended.
Replace if necessary. The work head can now be reassembled in reverse order bing careful not
to damage the T-ring seals and O-ring seal.
WARNING:
2. If press will not develop rated tonnage.
a. Relief valve set wrong. This valve is located in the lower left hand front corner of the manual
valve. The valve has been set at the factory to by pass oil from the pump back to the reservoir
when the pressure reaches rated capacity. To expose the relief valve for adjusting remove the
control handle ball, the control panel and the hex cap nut. The load on the spring which governs
the pressure at which the valve will by pass is adjusted by turning the adjusting screw clockwise
to raise the setting. Replace the hex cap nut, control panel and control handle ball after
adjusting. The relief valve should not be tampered with after it is once set at the capacity of the
press. NOTE: We advise that the relief valve not be tampered with after it is set at the
capacity of the press.
b. Trouble shoot 4 way vavle.
c. Worn ring – refer to section 1 (C) above.
3. If nothing happens when press is operated.
a. If motor does not run, the electrical circuit should be investigated.
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.
4. If press is operating slow.
a. Improper oil. It is essential that the recommended oil (Mobil DTE 24 or equivalent) be used.
Heavier oils cause a marked reduction in the ram speed. NOTE: DO NOT USE HYDRAULIC
JACK OIL!
5. In case of damage to the pump or if pump will not perform properly refer to pump service instructions.
CAUTION: Adjustments to pump are not necessary and the pump should not be tampered with
because expensive repairs may result.