Hydraulic Quick Disconnects - NPK PH1 Operator's Manual

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 disconnect to disintegrate. These pieces would migrate
into the hammer, causing damage.
2. If quick disconnects are not used when the hammer is removed from the excavator,
the hose ends should be capped to keep them clean.
contamination in the hose ends will be flushed into the hammer 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 quick
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.
APPROVED CONNECTION (39)
NPK APPROVED CONNECTION QUICK DISCONNECTS
CONTACT YOUR NPK DEALER FOR ADDITIONAL INFORMATION ABOUT
NOT RECOMMENDED CONNECTION
Non-NPK Quick Disconnects (32)
NPK QUICK DISCONNECTS (DX)
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If this is not done,