Honda H4518

Honda H4518The Honda H4518 is a lawn tractor with small 0.64 l (635 cc, 38.7 cu-in) two-cylinder water-cooled gasoline engine Honda GX640. The Honda H4518H is equipped with hydrostatic transmission and 965 mm (38 in.), 1190 mm (42 in.) or 1,168 mm (46 in) mower deck. The mower deck is adjustable in seven increments for cutting heights between 25 mm (1 in.) and 100 mm (4 in). The Honda H4518 lawn tractor was produced from 1991 through 1998.

The GX640 engine develops 18.0 HP (13.2 kW) at 3,600 rpm and 46.1 Nm (4.7 kg·m, 34.0 ft·lb) of torque at 2,500 rpm. It is a liquid-cooling motor with a 76.0 mm (3.0 in) cylinder bore and a 70.0 mm (2.8 in) stroke, and 8.0:1 compression ratio. The has an OHV design with two valves per cylinder; horizontal type carburetor with a butterfly valve; C.D.I. (Capacitor Discharge Ignition) ignition system, a mechanical centrifugal governor and electric starter.

The hydrostatic transmission. The transmissiom has three approximate ground speeds: Reverse to 3.4 km/h (2.1 mph), Mowing to 5.1 km/h (3.2 mph) and Transport to 7.6 km/h (4.7 mph)

H4518 specifications

General Specifications
ModelHonda H4518H
Length1,815 mm (71.5 in)
Width 38 inch deck type: 1,270 mm (50.0 in)
42 inch deck type: 1,460 mm (57.5 in)
46 inch deck type: 1,530 mm (60.2 in)
Height1,052 mm (41.4 in)
Wheel base1,190 mm (46.9 in.)
Dry weight 38 inch deck type: 290.0 kg (639.5 lbs)
42 inch deck type: 302.0 kg (655.9 lbs)
46 inch deck type: 304.0 kg (670.3 lbs)
Front tires size15×6.0-6
Front tires pressure98 kPa (1.0 kg/cm2, 14 psi)
Rear tires size20.5×8.5-10
Rear tires pressure79 kPa (0.8 kg/cm2, 11.4 psi)
Fuel tank capacity9.0 l (2.38 US gal., 1.98 Imp gal.)
Engine modelHonda GX630
Displacement635 cm3 (38.7 cu-in)
Bore x stroke76.0 x 70.0 mm (3.0 x 2.8 in.)
Max. horsepower18.0 HP (13.2 kW) at 3,600 rpm
Max. torque46.1 Nm (4.7 kg·m, 34.0 ft·lb) at 2,500 rpm
CarburetorHorizontal type, butterfly valve
Cooling systemLiquid-cooling
Ignition systemCDI ignition
Lubricating systemForced oil by trochoid pump
Starting systemElectric starter
Stoping systemCut off the power supply to the CDI (Open)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Oil typeHonda 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-40
Oil capacity (without filter changed)2.0 L (2.11 US qt, 1.76 Imp qt)
Oil capacity (with filter changed)2.3 L (2.43 US qt, 2.02 Imp qt)
Hydrostatic type transmission
TypeOil pressure-type variable-speed transmission
Groung speeds Reverse: 3.4 km/h (2.1 mph)
Mowing: 5.z km/h (3.2 mph)
Transport: 7.6 km/h (4.7 mph)
Mower Deck
Deck size965 mm (38 in.), 1,060 mm (42 in.) or 1,168 (46 in.)
Height range25-100 mm (1-4 in.)
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