Honda H5518

Honda H5518 lawn tractorThe Honda H5518 is a lawn tractor with Honda GX640 two-cylinder water-cooled gasoline engine 0.64 l (635 cc, 38.7 cu-in). The Honda H5518 tractor used selective sliding 8 speeds forward and 4 speeds reverse transmission. The Honda H5518 tractor was produced from 1991 to 1999.

The Honda 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. It produced 18.0 HP (13.2 kW) at 3,600 rpm of output power and 46.1 Nm (4.7 kg·m, 34.0 ft·lb) at 2,500 rpm of torque.

The Honda H5518 tractor used a mechanical leading-trailing shoe type brakes and pinion-and-sector four-wheel steering. The tractor has 150 mm (5.9 in.) of ground clearance.

General information

General Specifications
ModelHonda H5518
Modifications A4 type – two and four-wheel drive;
A2 type – two-wheel drive only
Length2,190-2,370 mm (86.2-93.3 in)
Width1,070-1,125 mm (42.1-44.3 in)
Height1,235 mm (48.6 in)
Wheel base1,305 mm (51.4 in.)
Dry weight457.0-480.0 kg (1,008-1,058 lbs)
Front tires size20×7.0-12
Front tires pressure98 kPa (1.0 kg/cm2, 14 psi)
Rear tires size24.5×8.0-14
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)
Gear typeSelective sliding 8 speeds forward and 4 speeds reverse transmission
Gear selections8 forward, 4 reverse
Groung speeds Forward:
1 (L-1): 0.7 km/h (0.4 mph)
2 (H-1): 1.1 km/h (0.7 mph)
3 (L-2): 1.5 km/h (0.9 mph)
4 (H-2): 2.4 km/h (1.5 mph)
5 (L-3): 3.4 km/h (2.1 mph)
6 (H-3): 5.3 km/h (3.3 mph)
7 (L-4): 7.1 km/h (4.4 mph)
8 (H-4): 11.1 km/h (6.9 mph)

1 (L-R1): 0.8 km/h (0.5 mph)
2 (H-R1): 1.4 km/h (0.7 mph)
3 (H-R2): 1.8 km/h (1.1 mph)
4 (H-R2): 2.8 km/h (1.7 mph)

BrakesMechanical leading-trailing shoe type brake (rear wheels)
SteeringPinion-and-sector four-wheel steering
Hydraulic system
Working pressure90 kg/cm2 (1,280 psi)
Pump typeGear pump
Oil capacity2.0 L (2.1 US. qt)
Wheels and tires
Front tires pressure98 kPa (1.0 kg/cm2, 14 psi)
Rear tires size24.5×8.0-14
Rear tires pressure79 kPa (0.8 kg/cm2, 11.4 psi)
Fuel tank capacity9.0 l (2.38 US gal., 1.98 Imp gal.)

Maintenance data

Idle speed1,400 ± 150 rpm
Cylinder compression4.0-7.0 kg/cm2 (57-100 psi) at 350 rpm
Valve clearance
Intake valve0.10-0.14 mm (0.004-0.006 in)
Exhaust valve0.18-0.22 mm (0.007-0.009 in)
Main jet#98
Float height14.0 mm (0.55 in)
Pilot screw opening1-1/2 turns out
Oil system
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)
Oil pressure3.0-4.0 kg/cm2 (43-57 psi) at 350 rpm
Start opening82° C (180° F)
Fully open95° C (203° F)
Lift height8.0 mm (0.31 in)
Temperature range for continuity110° ± 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 clearance0.04-0.09 mm (0.0016-0.0035 in)
Ignition system
Ignition timing22 ° B.T.D.C
Spark plug NGK: BPR5ES-11
Spark plug gap1.0-1.1 mm (0.039-0.043 in)
Primary side ignition coil resistance0.37-0.50 Ω
Secondary side ignition coil resistance8.0-9.3 kΩ
Starter motor
Brush length14 mm (0.55 in), limit: 9.0 mm (0.35 in)
Mica depth (limit)0.2 mm (0.008 in)
Transmission oil capacity3.8 L (4.0 US.qt)
Front differential oil capacity0.45 L (0.48 US.qt)
Final riduction oil capacity0.2 L (0.21 US.qt)


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Loader weight249 kg (550 lbs)
Height (to pin)1,83 mm (72.1 in)
Dump reach410 mm (16.4 in)
Dump angle47°
Reach at ground1,210 mm (47.9 in)
Rollback angle17°
Lift to full height (at pin)181 kg (400 lbs)
Bucket width1,060 mm (42 in)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

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