*1st Gear:* This is the lowest gear and is used for starting off, pulling heavy loads, or working in rough conditions.
*2nd Gear:* This is the second lowest gear and can be used for pulling moderate loads or working at higher speeds than in first gear.
*3rd Gear:* This is the middle gear and can be used for most general-purpose tasks, such as mowing, tilling, and cultivating.
*4th Gear:* This is the highest gear and can be used for transport, hauling light loads, or working at high speeds.
*Reverse Gear:* This gear is used to move the tractor backwards.
The pattern of the gears on a 901 Ford tractor is as follows:
```
_________ _________
/ 1|2|3|4 \ R|N |
'___________'
```
The gear shift lever is located on the right side of the steering wheel. To shift gears, lift the gear shift lever and move it to the desired position.