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ATTENTION
GAS CHARGE
NITROGEN GAS PRESSURE
The nitrogen gas pressure must be measured with no preload on the tool. Remove the
tool; or position the hammer with the tool fully extended against the tool retaining pin.
The hammer must not be resting vertical on the tool. The gas pressure in the hammer
will vary according to the gas temperature.
PREFERRED METHOD
The preferred method to measure or charge the nitrogen gas pressure is with the
hydraulic system temperature stabilized at maximum operating temperature. The chart
showing values for
“Operating Temperature”
should be used, see below.
ALTERNATE METHOD
The nitrogen gas pressure can be measured or charged at ambient temperature (cold),
before operating the hammer. See the chart
“Ambient Temperature”
below.
DO NOT OVERCHARGE THE HAMMER!
Exceeding the gas pre-charge specifications can result in damaging hammer
components. The NPK WARRANTY does not cover failures resulting from exceeding
the specified nitrogen gas pressure.
NITROGEN GAS PRE-CHARGE
MODEL
AT AMBIENT TEMPERATURE
(cold, before operating)
PSI (BARS)
(plus 0, minus 25)
AT OPERATING TEMPERATURE
PSI (BARS)
(plus 0, minus 25)
GH06
350 (24)
405 (28)
GH07
350 (24)
405 (28)
GH1
350 (24)
405 (28)
GH2 / GHS2
350 (24)
405 (28)
GH3
350 (24)
405 (28)
GH4
375 (26)
435 (30)
GH6
390 (27)
450 (31)
GAS CHARGE ADAPTER
MODELS GH06, GH07, GH1, GH2/GHS2
The NPK Models GH06, GH07, GH1 and GH2/GHS2
hydraulic hammers have a gas charge fitting in the gas
head that is different from all other NPK hydraulic
hammers. After removing the existing plug (g12), the
adapter (P/N 30604100) (g13) is threaded on to the
existing gas charge fitting. This adapter is included in
the gas charge kit that is provided with the hammer and
allows use of the standard NPK gas charge valve (P/N
30604040) (g1), see next page.
Содержание GH06
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