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1. If the press loses pressure:
a. Check all tubing joins for leaks and tighten tube nuts.
b. Leakage past the release valve (Item 67). Drain reservoir and remove packing nut
(Item 66), valve rod (Item 64), and ball valve (Item 63). Clean out valve seat and
reseat ball valve using a 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 60). Drain reservoir, remove large pipe
plug (Item 62), valve seat (Item 61), and check ball (Item 60). Clean and inspect
seat. Reset ball on seat or replace seat with new part if necessary. Reassemble
with ball above the seat tightening plugs securely.
d. Worn leather cup or T-ring seal. If none of the previous conditions seem to have
been the cause, the leather cup or T-ring may be worm or damaged. To inspect,
drain oil and remove the work head from the press frame. Remove tube assembly
(Item 123). Set two 4x4 blocks on the table then raise the 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 the work head using the table.
WARNING: Be sure the stroke indicator rod support is installed in the side of
the piston. If not, insert 1/2"-13 stud or cap screw into the tapped hole in the
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.
Note: A leather cup will only be in presses made before 1992 or has a serial
number before 192522.
2. Press will not develop rated tonnage.
a. Dirt under ball valves. Refer to 1 – c above.
b. Worn leather cup or T-ring seal. See 1 – d above.
c. Relief valve is 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 to the
capacity of the press.
905050
12
Dake Corporation
724 Robbins Road
Grand Haven, MI 49417
www.dakecorp.com
REV112019
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