Honda H4518

Honda H4518The 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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