HYDRAULIC INSTALLATION
HYDRAULIC QUICK DISCONNECTS
NPK recommends against the use of non-NPK quick
disconnects on hydraulic circuits operating NPK Products.
1. The hydraulic pulsations caused by hydraulic hammer operating can cause internal
pieces of non-NPK quick disconnects (32) to disintegrate. These pieces would
migrate into the hammer, causing damage.
2. If hydraulic quick disconnects are used, they should be capped when the hammer is
removed from the carrier to keep them clean. Contamination can get into the
hydraulic quick disconnect and can be flushed into the hammer and/or the hydraulic
system when re-connected. This, again, can cause damage.
3. Most quick disconnects create a restriction in the circuit. NPK Hammers are not
backpressure sensitive, but restrictions cause unnecessary heating of the oil. Also,
the pressure required to operate the hammer, plus the restriction in the disconnects
may push an older, low pressure, carrier machine to the limit of its hydraulic system.
This would interfere with proper hammer operation. However, the NPK approved
quick disconnects are properly sized so that the hammer operation is not
affected.
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