Gravely lawn tractors
Gravely 450
The Gravely 450 is a garden tractor introduced in 1970 as part of the 400 Series. It features a 16.5 hp Onan 816cc 2-cylinder air-cooled gasoline engine, a Swiftamatic 8 shaft-driven 4-speed transmission with forward and reverse gears, and two-wheel drive with manual steering. The tractor has an open operator station and weighs 950 lbs (430 kg). It rides on 16x6.50-8 front tires and 23x8.50-12 rear tires. Attachments include 30", 40", and 50" mid-mount mower decks. Electrical system is 12 volts with negative ground. Serial numbers are located ahead of the rear axle on the left side.
Power16 hp
Founded30/40/50" deck
Model450
Technical Specifications
Detailed specifications and technical data for Gravely 450
Tires
| Rear tire | 23x8.50-12 |
|---|---|
| Front tire | 16x6.50-8 |
Engine
| Type | gasoline, 2-cylinder, air-cooled |
|---|---|
| Model | Onan CCKA |
| Power | 16.5 hp (12.3 kW) |
| Fuel tank | 5.3 gal (20.1 L) |
| Rated RPM | 3600 |
| Air cleaner | dry element |
| Bore/Stroke | 3.00x3.25 inches (76 x 83 mm) |
| Displacement | 816 cc (49.8 ci) |
| Oil capacity | 2 qts (1.9 L) |
| Sparkplug gap | 0.025 inches (0.635 mm) |
| Starter volts | 12 |
| Intake valve clearance | 0.011 inches Cold (0.279 mm) |
| Exhaust valve clearance | 0.011 inches Cold (0.279 mm) |
Dimensions
| Width | 41.75 inches (106 cm) |
|---|---|
| Height | 43 inches (109 cm) |
| Length | 75.5 inches (191 cm) |
| Shipping weight | 950 lbs (430 kg) |
Electrical
| Ground | negative |
|---|---|
| Battery volts | 12 |
Mechanical
| Drive | Two-wheel drive |
|---|---|
| Steering | Manual steering |
| Operator station | Open operator station |
Production
| Type | Garden tractor |
|---|---|
| Series | 400 Series |
| Manufacturer | Gravely |
| Year introduced | 1970 |
Attachments
| Notes | Garden tractors are capable of using tillers, plows, or other ground-engaging attachments. |
|---|---|
| 30 inch mid-mount mower deck | 30 inches (76 cm) |
| 40 inch mid-mount mower deck | 40 inches (101 cm) |
| 50 inch mid-mount mower deck | 50 inches (127 cm) |
Transmission
| Type | shaft-driven gear |
|---|---|
| Gears | 4 forward and reverse |
| Model | Swiftamatic 8 |
| Notes | Two-speed shift-on-the-move affects transmission and PTO speed. Additional two-speed range for transmission can be shifted only when stopped. Right-hand directional clutch lever controls forward and reverse. |
| Oil type | SAE 90W-EP |
| Oil capacity | 5 qts (4.7 L) |
Serial Numbers
| Location | Ahead of rear axle on left side. |
|---|