I am wondering how the pyramid tracks do in the snow? Side traction?
Any advice would be appreciated. Thanks, great forum you have here.
I found this information:
There are 2 model numbers that show transmission type.
D20 = direct drive transmission. This is a standard shift, where you operate a foot clutch and shift with a lever mounted on the floor. Very similar to a standard shift truck and same benefits. Simple, long lasting and more power to the running gear. Very durable and idea for remote location use. The 3rd forward speed is very fast for overland travel.
D21 = power shift transmission or hydrostatic. This allows shifting without using a clutch. You still have to shift to change direction and speed, but the lever is mounted on the side by armrest. There is still a clutch if you need it for close in work. 2 forward speeds /2 reverse. U pattern with neutral in the center forward. This provides a more open cab design than the direct drive models. Faster operation is one benefit.
There are 2 letter designations after the model number that show track type
A Model = Standard track width. On the factory "A" model the shoes are a 12" single grouser with 5.1 psi ground pressure. Blade width is just over 7'. On the models that we convert the shoes, we install a slightly wider 13.5" single grouser for 4.75 psi ground pressure.
P Model = wide track. On the factory "P" model the shoes are 20" pyramid or swamp type shoes with 3.4 psi ground pressure. Some have grouser bar welded to the top for additional traction. These are an excellent low ground pressure pad and are self cleaning and will run in snow without plugging. They are rough riding on rocky ground, do not provide as much traction as the single grouser shoes and tend to break in hard ground applications. Blade width on the "P" model is 8'-4" and angles to 8'.
We can convert the "P" models to an "A" model by changing out the track shoes to an improved 13.5" single grouser shoe or the factory spec 20" single grouser shoe. The 13.5" shoe increases the ground pressure to 4.75 psi but you have the advantage of increased traction, keep the larger blade of a "P" model and the tracks are more offset from the machine providing a wider stance and more stability. We believe this modification gives you an excellent machine/track combination and is only available from us. We have the shoe plates and bolts in stock to do whatever you prefer.
APPLYING THE ABOVE:
D21P - is a powershift wide track
D20P - is a direct drive wide track
D21A - is a powershift narrow track
D20A - is a direct drive narrow track
The only other model designation is the -5, -6 or -7
Models ending in -5 are pre 1985
Models ending in -6 are 1985-1992
Models ending in -7 are 1992 or newer
There are also some -7 models produced after 1997 that have a single lever blade control and the 2 speed in the directional joystick
The -7 models are different in that they have the latest refinements. The most significant is the option of having a single lever (or joystick) steering control. They are also quieter, have full engine side covers and turn off with the key. The -7 models are quicker and are typically the high end contractor models.
All can be outfitted with a Roll Over Protection System canopy to replace the fiberglass rain canopy. We stock all steel canopies. (RO
