NPK GH7 - Hammer Specifications

NPK
- 7 -
HAMMER SPECIFICATIONS
HAMMER
MODEL
IMPACT
ENERGY
CLASS
FREQUENCY WORKING
WEIGHT
TOOL
DIA WORKING
LENGTH
ft lb bpm lbs (Kg) in (mm) in (mm)
GH7 2500 400 - 750 2900 (1320) 4.6 (116) 23 (583)
GH9 3000 500 - 670 3600 (1635) 5.0 (126) 24 (608)
GH10 4000 400 - 550 4200 (1900) 5.4 (136) 24.5 (620)
GH12 5500 380 - 480 5650 (2565) 5.7 (146) 25.5 (650)
GH15 8000 320 - 400 6800 (3085) 6.1 (156) 27 (690)
GH18 12000 300 - 400 7800 (3540) 6.5 (165) 29 (740)
GH23 13500 300 - 400 9240 (4190) 6.9 (174) 34.6 (880)
GH30 15000 310 - 390 13500 (6125) 7.2 (184) 32 (813)
GH40 17000 240 - 330 17000 (7710) 8.0 (204) 35.4 (899)
GH50 20000 210 - 280 24910 (11300) 8.4 (214) 39.7 (1008)
HAMMER
MODEL
OIL FLOW
HYDRAULIC
OPERATING
PRESSURE
1
CIRCUIT
RELIEF
minimum
2
GAS CHARGE
PRESSURE
5
Cold
3
Hot
4
gpm (L/min) psi (bar) psi (bar) psi (bar) psi (bar)
GH7 26 - 48 (100 - 180) 2600 (180) 3100 (215) 350 (24) 405 (28)
GH9 40 - 53 (150 - 200) 2600 (180) 3100 (215) 365 (25) 420 (29)
GH10 44 - 55 (165 - 210) 2600 (180) 3100 (215) 365 (25) 420 (29)
GH12 45 - 58 (170 - 220) 2650 (183) 3150 (218) 365 (25) 420 (29)
GH15 53 - 66 (200 - 250) 2600 (180) 3100 (215) 365 (25) 420 (29)
GH18 58 - 77 (220 - 290) 2500 (172) 3000 (207) 365 (25) 420 (29)
GH23 66 - 85 (250 - 320) 2600 (180) 3100 (215) 390 (27) 450 (31)
GH30 74 - 92 (280 - 350) 2600 (180) 3100 (215) 390 (27) 450 (31)
GH40 79 - 106 (300 - 400) 2600 (180) 3100 (215) 390 (27) 450 (31)
GH50 92 - 119 (350 - 450) 2600 (180) 3100 (215) 390 (27) 450 (31)
*Specifications subject to change without notice.
NOTES:
1. Hydraulic operating pressure maximum is inlet pressure at the hammer with the oil at
operating temperature and with the gas charge set at the hot operating pressure.
See CHECKING THE HYDRAULIC PRESSURES section in Service Manual.
2. Circuit relief pressure is at least 500 psi (35 bar) above hammer operating pressure.
3. Cold gas charge is the initial set with the hammer at ambient temperature.
4. Hot gas charge is checked after 1 to 2 hours of running and with a system oil temperature of
140° to 180°F (60° to 80°C). This is the preferred check.
5. Pressures listed are maximum. Use tolerance of minus 25 psi (2 bar).