From inside (document excerpt):
ProCore 648 Specifications* PROCORE 648, MODEL 09200 ENGINE FUEL CAPACITY ELECTRICAL DRIVETRAIN HYDRAULIC SYSTEM CONSTRUCTION TIRES BRAKES GROUND SPEED Kohler ®, 2-cylinder, air-cooled, 23 hp (17.2 kW) gross, 19 hp (14.2 kW) net @ 3000 rpm, 41 cu-in. (674 cc) displacement. Dry, large capacity, replaceable element air filter. External spin-on oil filter, 2-quart (1.9-liter). 7.5-gallon (28.4-liter), gasoline.
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12 volt, 15 amp regulated charging alternator/generator. BCI Group No.: U1 battery, 300 cold cranking amp @ 0°F. Micro-processor logic control. 3WD, Series-Parallel hydrostatic, closed loop. Variable displacement piston type pump. High-torque, low-speed wheel motor drive. Remote spin-on filter. 3.0- gallon (13.2-liter), Mobilfluid 424 (std.) or Mobil EAL biodegradable (opt.). Traction unit: welded steel frame. Coring head: welded steel frame with cast crank and arm assembly. 20 x 10-10, 2-ply rated, smooth tread, tubeless, inflated to 12 psi, de-mountable rims. Dynamic braking through hydrostatic transmission service brake. Hand actuated parking brake. Transport: Forward: 0-3.5 mph (0-6.4 km/h), variable Reverse: 0-2.0 mph (0-3.2 km/h), variable Aerating: .77-1.51 mph (1.23-2.42 km/h), variable Hourmeter, tachometer. Hand controlled bail on handle, coring head lifts and de-clutches if control bail is released. Parking brake and transaxle shift on handle. Coring head raise/lower switch on handle console. Side console with ignition, aeration spacing, manual ground follow and system reset. Aeration depth adjustment on coring head. Throttle and choke on engine. Clutch latch, traction neutral, coring head raise/lower. Length 104.5 ” (265.4 cm) Width 50.12 ” (127.3 cm)