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C. Press does not develop rated tonnage.
1. Dirt under Release Valve Ball: See section above.
2. Worn Leather Cup or Piston Seal: See section above.
3. Air pressure too low: If the air supply is less that 90PSI the pump may develop less than the rated
tonnage.
4. Relief Valve set incorrect: When the press will not develop rated tonnage even though the air motor
continues to pump. It may indicate that the oil is bypassing though the relief valve. The relief valve
has been set at the factory to bypass oil back to the reservoir when press reaches rated tonnage.
The load on the spring which governs the pressure at which the valve will bypass oil is adjusted by
turning the threaded cap, Turning clockwise to increase the load on the spring or counterclockwise to
decrease the load on the spring. After the valve is adjusted the cap is locked in place with a set
screw, the relief valve not be tampered with after it is set to the capacity for the press.
D. Nothing happens when pumps are operated.
1. Release Valve is open: Be sure release valve is firmly closed.
2. Airline connected improperly: If air motors do not run when first time running the press check air line
connections.
3. Insufficient oil: This is not a likely to be the issue on a tire press but if the press will only make a
fraction of its rated stroke and no more, check the oil level in the reservoir. With the ram down the oil
should be about 4" from the top of the reservoir.
4. Repaired Improperly: If press has had any maintenance in the past it is possible that a check valve
spring or check ball got missed in the repairs.
E. Press is too slow.
1. Air pressure too low: If the airline is not large enough to travel a distance from the compressor it may
result in a large pressure drop in the line while air is being used. Check for pressure drop by
installing an air gauge near the inlet of the press.
2. Wrong oil: Oil that is too heavy will slow the pressing speed. DTE Mobil 24 or equivalent hydraulic oil
933587
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Dake Corporation
1809 Industrial Park Dr
Grand Haven, MI 49417
www.dakecorp.com
REV122022
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