Engine typing refers to an engines' capability. In general, the smaller the number, the more power, size, capacity, etc.
Here's the minimum standards for each type:
Type 1 - 1000 GPM, min. 400 gallons of water, 1200' of 2 1/2", 400' of 1 1/2", 200' of 1", 1 20' ladder and min. 4 personnel.
Type 2 - 500 GPM, min. 400 gallons of water, 1000' of 2 1/2", 500' of 1 1/2", 300' of 1", 1 20' ladder and min. 3 personnel.
Type 3 - 120 GPM, min. 500 gallons of water, 1000' of 1 1/2", 800' of 1", min. 3 personnel.
Type 4 - 70 GPM, min. 750 gallons of water, 300' of 1 1/2", 300' of 1", min. 3 people.
Type 5 - 50 GPM, min. 500 gallons of water, 300' of 1 1/2", 300' of 1", min. 3 people.
Type 6 - 50 GPM, min. 200 gallons of water, 300' of 1 1/2", 300' of 1", min. 2 people.
Type 7 - 20 GPM, min. 125 gallons of water, 200' of 1 1/2", 200' of 1", min. 2 people.
An "X" after the type number means it's 4-wheel drive.
And here is a picture of a McLeod if I did the image insert thing right. Great tool for duff and leaf/needle litter plus it can dig a lot of line in a short time. Hope this helps. CLM