The Honda H4518 is a lawn tractor with Honda GX640 two-cylinder water-cooled gasoline engine 0.64 l (635 cc, 38.7 cu-in). The Honda H4518H used 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 to 1998.
The GX640 engine produced 18.0 HP (13.2 kW) at 3,600 rpm of maximum output power and 46.1 Nm (4.7 kg·m, 34.0 ft·lb) at 2,500 rpm of maximum torque. The GX640 is a liquid-cooling engine with a 76.0 mm (3.0 in) of the cylinder bore and a 70.0 mm (2.8 in) of the piston stroke, and 8.0:1 compression ratio rating.
The H4518 is equepped with hydrostatic transmission. This transmission 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)
General information
| General Specifications | ||
| Model | Honda H4518H | |
| Length | 1,815 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) | |
| Height | 1,052 mm (41.4 in) | |
| Wheel base | 1190 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) | |
| Fuel tank capacity | 9.0 l (2.38 US gal., 1.98 Imp gal.) | |
| Battery | 12V-30AH | |
| Engine | ||
| Engine model | Honda GX630 | |
| Displacement | 635 cm3 (38.7 cu-in) | |
| Bore x stroke | 76.0 x 70.0 mm (3.0 x 2.8 in.) | |
| Max. horsepower | 18.0 HP (13.2 kW) at 3,600 rpm | |
| Max. torque | 46.1 Nm (4.7 kg·m, 34.0 ft·lb) at 2,500 rpm | |
| Carburetor | Horizontal type, butterfly valve | |
| Cooling system | Liquid-cooling | |
| Ignition system | CDI ignition | |
| Lubricating system | Forced oil by trochoid pump | |
| Starting system | Electric starter | |
| Stoping system | Cut off the power supply to the CDI (Open) | |
| Fuel used | Unleaded gasoline (octane number 86 or higher) | |
| Hydrostatic type transmission | ||
| Type | Oil 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) | |
| Wheels and tires | ||
| Front tires size | 15×6.0-6 | |
| Front tires pressure | 98 kPa (1.0 kg/cm2, 14 psi) | |
| Rear tires size | 20.5×8.5-10 | |
| Rear tires pressure | 79 kPa (0.8 kg/cm2, 11.4 psi) | |
| Mower Deck | ||
| Deck size | 965 mm (38 in.), 1,060 mm (42 in.) or 1,168 (46 in.) | |
| Height range | 25-100 mm (1-4 in.) | |
Maintenance data
| Engine | |
| Idle speed | 1,400 ± 150 rpm |
| Cylinder compression | 4.0-7.0 kg/cm2 (57-100 psi) at 350 rpm |
| Valve clearance | |
| Intake valve | 0.10-0.14 mm (0.004-0.006 in) |
| Exhaust valve | 0.18-0.22 mm (0.007-0.009 in) |
| Carburetor | |
| Main jet | #98 |
| Float height | 14.0 mm (0.55 in) |
| Pilot screw opening | 1-1/2 turns out |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 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) |
| Oil pressure | 3.0-4.0 kg/cm2 (43-57 psi) at 350 rpm |
| Thermostat | |
| Start opening | 82° C (180° F) |
| Fully open | 95° C (203° F) |
| Lift height | 8.0 mm (0.31 in) |
| Thermoswitch | |
| Temperature range for continuity | 110° ± 2° C (230° ± 36° C) |
| Oil pump | |
| Tip clearance (standard) | 0.14 mm (0.006 in) |
| Outer rotor clearance (standard) | 0.15-0.21 mm (0.006-0.008 in) |
| Pump end clearance | 0.04-0.09 mm (0.0016-0.0035 in) |
| Ignition system | |
| Ignition timing | 22 ° B.T.D.C |
| Spark plug | NGK: BPR5ES-11 NIPPONDENSO: W16EPR-11 |
| Spark plug gap | 1.0-1.1 mm (0.039-0.043 in) |
| Primary side ignition coil resistance | 0.37-0.50 Ω |
| Secondary side ignition coil resistance | 8.0-9.3 kΩ |
| Starter motor | |
| Brush length | 14 mm (0.55 in), limit: 9.0 mm (0.35 in) |
| Mica depth (limit) | 0.2 mm (0.008 in) |
| Hydrostatic transmission lube | |
| Transmission oil type | Honda hydrostatic transmission oil |
Attachments
| Honda 38″ mid-mount mower deck | |
| Cutting width | 960 mm (38 in) |
| Honda 42″ mid-mount mower deck | |
| Cutting width | 1,060 mm (42 in) |
| Honda 46″ mid-mount mower deck | |
| Cutting width | 1,160 mm (46 in) |
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