Dayton Die Cushions
6330 Industrial Dr, Eden Prairie Mn 55346, USA
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 Installation Guides
>>Installation/Operation >>Cushion Operation
Die cushion operation is quite straightforward. Standard pneumatic die cushion is pushed down by the ram through pins that rest on the top of the pin pad and then it returns to its upper stop position (usually bottom of the bolster or cushion's stop rods) by following the ram movement up during return part of the stroke. However there are few concepts that should be mentioned in regards to die cushion operation:

1.Die cushion tonnage

System pressure defines the die cushions tonnage that it will develop during the stroke. Die cushion tonnage is rated at the maximum allowed pressure and at the top of the stroke. Generally pneumatic die cushions are rated to 100 or 200 psi. They can develop less than rated tonnage by adjusting system pressure to the number lower than the maximum pressure. Tonnage-pressure relation is proportional so if for example die cushion develops 10 tons at 100 psi, it will develop 5 tons at 50 psi. Also, system pressure increases slightly during the stroke (by no more than 15%), so it is higher at the bottom of the stroke.
In order to regulate pressure in low pressure die cushions (operating at maximum 100 psi), one should use regulator and gauge assembly and just shut off regulator inlet port (by turning regulator knob) when the system reaches desired pressure. Similarly, for high pressure die cushions (200 psi maximum), regulator on the booster pump should be closed once the system pressure is at desired level.

2.Correct die pin placement

It is critical to evenly load the die cushion's pin pad to prevent so-called off-center loading and cocking of the cylinder-piston assembly. Even distribution of pins throughout the pin pad and use of compensating pins will help accomplish this.


To ensure proper die cushion functioning, prevent galling and scoring of the cylinder-piston bearing surface and other mechanical damage, die cushions should be lubricated after every 8 hours of operation.

4.Draining the die cushion

Die cushions and surge tank should be drained daily to remove any accumulated moisture inside the system. It is important as it could reduce system surge volume and result in too high of the pressure build-up (above safety limits). Some model D die cushions are not supplied with the surge tank. In this case drain cock should be installed directly on the cushion. Otherwise, drain cock should be installed at the low point of the system and on the surge tank.


Model C
Model D
Model HC
Model HD
Model MC
Model MD
Model HMC
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