Replacement Part List
G4-276 (48RCLB) 7/18b
Alternator Specifications
Specifications Alternator
Manufacturer Kohler
Type 4-Pole, Rotating Field
Exciter type Brushless, Rare-Earth
Permanent Magnet
Leads: quantity, type
4Q7BX 4, 120/240
4P7BX 12, Reconnectable
Voltage regulator Solid State, Volts/Hz
Insulation: NEMA MG1
Material Class H
Temperature rise
130_C, Standby
Bearing: quantity, type 1, Sealed
Coupling Flexible Disc
Amortisseur windings Full
Voltage regulation, no-load to full-load
±1.0% RMS
Unbalanced load capability 100% of Rated Standby
Current
One-step load acceptance 100% of Rating
Peak motor starting kVA: (35% dip for voltages below)
480 V, 400 V 4P7BX (12 lead) 180 (60 Hz), 136 (50 Hz)
240 V 4Q7BX (4 lead) 113 (60 Hz)
D The unique Fast-Responser X excitation system delivers
excellent voltage response and short-circuit capability using a
rare-earth, permanent magnet (PM)-excited alternator.
D Brushless, rotating-field alternator.
D NEMA MG1, IEEE, and ANSI standards compliance for
temperature rise and motor starting.
D Sustained short-circuit current of up to 300% of the rated
current for up to 10 seconds.
D Sustained short-circuit current enabling downstream circuit
breakers to trip without collapsing the alternator field.
D Self-ventilated and dripproof construction.
D Windings are vacuum-impregnated with epoxy varnish for
dependability and long life.
D Superior voltage waveform from a two-thirds pitch stator and
skewed rotor.
D Total harmonic distortion (THD) from no load to full load with
a linear load is less than 4%.
Application Data
Engine
Engine Specifications 60 Hz 50 Hz
Manufacturer Kohler
Engine: model, type KG6208 6.2L
Natural Aspiration
Cylinder arrangement V-8
Rated rpm 1800 1500
Displacement, L (cu. in.) 6.2 (378)
Bore and stroke, mm (in.) 101.6 x 95.25 (4.00 x 3.75)
Compression ratio 10.5:1
Max. power at rated rpm, kW (HP) 77.0 (103) 64.3 (86)
Cylinder head material Cast Aluminum
Piston type and material High Silicon Aluminum
Crankshaft material Cast Iron
Valve (exhaust) material Forged Steel
Governor type Electronic
Frequency regulation, no-load to full-load Isochronous
Frequency regulation, steady state 1.0%
Frequency Fixed
Air cleaner type Dry
Engine Electrical
Engine Electrical System
Ignition system Electronic
Battery charging alternator:
Ground (negative/positive) Negative
Volts (DC) 12
Ampere rating 130
Starter motor rated voltage (DC) 12
Battery, recommended cold cranking
amps (CCA):
Qty., rating for --18_C(0F)
One, 630
Battery voltage (DC) 12
Battery group size 24
Exhaust
Exhaust System 60 Hz 50 Hz
Exhaust manifold type Dry
Exhaust flow at rated kW, m
3
/min. (cfm) 16.4 (580) 13.6 (480)
Exhaust temperature at rated kW, dry
exhaust, _C(_F)
649 (1200)
Maximum allowable back pressure,
kPa (in. Hg)
10.2 (3.0)
Exhaust outlet size at engine hookup,
mm (in.)
76 (3.0) OD
Fuel
Fuel System
Fuel type LP Gas or Natural Gas
Fuel supply line inlet 1 in. NPT
Natural gas fuel supply pressure,
kPa (in. H
2
O)
1.74--2.74 (7-11)
LPG vapor withdrawal fuel supply
pressure, kPa (in. H
2
O)
1.24--2.74 (5-11)
Fuel Composition Limits *
Nat. Gas LP Gas
Methane, % by volume 92 min. —
Ethane, % by volume 4.5 max. —
Propane, % by volume 1.0 max. 87 min.
Propene, % by volume 0.1 max. 5.0 max.
C
4
and higher, % by volume 0.3 max. 2.5 max.
Sulfur, ppm mass 25 max.
Lower heating value,
MJ/m
3
(Btu/ft
3
), min.
33.2 (890) 84.2 (2260)
* Fuels with other compositions may be acceptable. If your fuel is
outside the listed specifications, contact your local distributor for
further analysis and advice.
Lubrication
Lubricating System
Type Full Pressure
Oil pan capacity, L (qt.) 5.7 (6.0)
Oil pan capacity with filter, L (qt.) 7.1 (7.5)
Oil filter: quantity, type 1, Cartridge