Skip to content

WARN Winch Performance Specifications: Pulling Capacity by Layer

warn_zeon8_winching_v2By Steve Schoenfelder
WARN Industries

WARN lists winch performance specifications on each winch page (you can find the specs for the ZEON 8 here), this includes winch line speed and amp draw.  This is good information so you can compare the performance of different winch models. Off to the right, we also show a column that says Pull by Layer. This column lists the pulling capacity of the winch with, one layer of rope on the drum, two layers of rope, three layers, etc.

Warn winches are rated to pull their maximum load when spooling the first layer of rope onto the winch drum.  So an 8000lb capacity winch will only pull 8000 pounds when you are spooling the rope onto the first layer.

Now, you’re asking yourself, I thought my 8000lb winch would always pull 8000lbs?  Let me explain the pull by layer concept.  As rope is stacked up onto the drum, you are effectively changing the gear ratio of the winch by increasing the diameter of the winch drum.  To help explain this, think about that old 15 speed bike you had back in the day, it had 3 driving sprockets in the front at the pedals.  When the chain was on the smallest sprocket, you had the most power and could climb steep hills.  This is the same as spooling cable onto the 1st layer of your winch drum. When you moved the chain to the middle sprocket, you had less power, but more speed.  On the largest sprocket, you had the least power, but most speed.

When you look at the ZEON-8 Pull by Layer Column (on the ZEON 8 page; in the 12V Dc Performance Specs chart)  it shows:

Layer 1 – 8000lbs.
Layer 2 – 6777lbs.
Layer 3 – L5878lbs.
Layer 4 – 5189lbs.
That’s a loss of about 15% capacity per layer.

(You can view the ZEON 8 Performance Chart at WARN’s website)

So what does this mean the next time you need to pull yourself up a hill or out of the mud?  Pull as much cable off the drum as possible so your winch is pulling as close to its maximum capacity as possible. (Remember to always leave a minimum 5 wraps on the drum with wire rope, 10 wraps on the drum with synthetic rope).

If your only anchor tree is 20ft away, and you have 125ft of rope on your drum, I would automatically use a Snatch Block.  This does two things, it gets more rope off the drum, and it doubles the winches capacity, so you’re putting less load on the winch motor.  Less load on the motor, means less amp draw, less heat buildup, longer run time, and less load on the battery and alternator.  That’s a Win-Win all the way around!

Take a look at our Basic Guide to Winching Techniques at http://www.warn.com .  The Winching Techniques Guide can be downloaded for later reference, and it’s a great “How To” on the operation of an electric winch and all the accessories needed to use your winch safely and make your winch really useful.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: