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ProMark Offroad Blog

Winch Pulling Power

Electric Winch

Electric winches require cooling periods to prevent overheating on long pulls.

Electric winches are rated by maximum pulling capacity. For example, a 10,000 lb winch can safely handle up to 10,000 pounds without breaking or stalling, under the right pulling conditions.

The maximum pulling capacity is based on the first layer of cable on the drum. If you rig up your winch with more than one layer remaining on the drum, the pulling capacity drops for each added layer of cable on the drum. As the layers increase, pulling power decreases.

How to Get More Winch Power

If you need more pulling power, spool out more cable. You can do this either by choosing an anchor point further away from the vehicle or by using a snatch block to double back the cable. A double line pull increases your winch power by almost doubling the capacity.

Be careful not to exceed the maximum rated capacity for your winch. If you think the load will be close to the maximum winch rating, rig up a double line pull for extra power. If you exceed the winch’s rating, the cable could snap, the winch could stall, or you could damage your winch. Exceeding the winch’s rating is dangerous, since a snapped cable can cause major damage to anyone or anything in its way.

How to Prevent Overheating

Unlike hydraulic winches, electric winches are not designed for long, continuous pulls. If you need to winch over a long distance, stop winching and let the motor cool down every so often to prevent overheating. If the motor becomes uncomfortably hot to the touch, that means you need to take a break. Wait five minutes or so—until the motor feels cooler to the touch—and continue winching.

Does a 10K Winch REALLY Pull 10,000 lbs?

This 10K Midnight Recovery Winch has the capacity to pull 10,000 pounds is all the required factors are met.

This 10K Midnight Recovery Winch has the capacity to pull 10,000 pounds if all the required factors are met.

The short answer to this question? Yes…BUT there are several factors that determine how much your 10,000 lb winch (or any other winch) can pull, including the following:

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  • There must be only one full layer of cable left on the drum.
  • The vehicle being pulled must be on solid ground (not mud, sand, or any other “sucking” surface).
  • The vehicle being pulled must have properly inflated tires and be able to roll easily.
  • The winch must NOT be pulling the vehicle up an incline.
  • The winch must receive adequate 12 volt power and amp draw.

If you are pulling a 10,000 pound load and then STOP winching, there will be more than one layer of cable on the drum, which means that when you try to start winching again, your winch may not be able to handle the load.

As more layers stack up on the drum, your rated line pull drops. For example, if you have 3 wraps on the drum after you stop pulling, you’ll only have about 6500 pounds of pulling capacity when you start pulling again. See the following table for an example of how much the rated line pull of a 10K recovery winch would drop per layer:

10,000 LB Rated Line Pull

Layer of Cable 1st Layer 2nd Layer 3rd Layer 4th Layer
Rated Line Pull per Layer 10,000 lbs. 7,964 lbs. 6,591 lbs. 5,632 lbs.

 

So how does a winch manage to KEEP pulling a 10,000 pound load even as the layers stack up on the drum? Momentum. Although it might take 10,000 pounds to break the initial resistance and get the vehicle in motion, once it starts rolling, the momentum of the pull helps the winch keep on pulling, even though the layers are stacking up on the drum and the rated line pull is dropping.

In every winching situation, your circumstances will be different, which means that your winch may not pull as much as it’s rated for every time you use it. One way to get around this is to double the winch line using a snatch block. This will double the rated line capacity of the winch and unwind more cable from the drum, which gives you a higher line pull.

Can a Winch Hold a Load?

Winching Tip of the Week from ProMark Offroad

 

Winching Tip of the Week: NEVER rely on a winch to hold a load from rolling backward.

Most off road winches are designed with a dynamic braking system, which is not designed to hold a load. This means that 1) you need to be especially careful when winching up a hill or incline, and 2) you should never use your winch as a hoist.

  1. Use caution when winching up a hill or incline.
  2. When you’re winching up a hill, do not stand behind the vehicle being winched. Keep all bystanders out of the way. Be aware that if you stop winching, the load may roll back a few feet before stopping. Even if the vehicle is stopped on the hill, avoid walking behind it during the winching process.

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  3. Do not use the winch as a hoist.
  4. An ATV winch or recovery winch should never be used as a hoist unless specifically approved by the manufacturer. You should not winch at an angle greater than 45 degrees with an ATV or recovery winch. The dynamic braking system in these winches is not designed to hold a load vertically or at steep angles. A hoist has a specially designed gearing and braking system that allows it to hold a vertical load. A winch is designed for pulling; a hoist is designed for lifting.

Drum Diameter and Line Speed for Offroad Winches

Along with the gear ratio, the drum diameter of your winch has a direct effect on line speed and pulling power. As more layers of cable pile up on the drum, the pulling power from your winch decreases and the line speed of the cable drops.

The rated line pull per layer drops up to 20 percent for the first layer of cable on top of the base layer and then 10 percent or more for layers after that.

Typical Rated Line Pull Per Layer

Example: 8000 lb. Winch

Layer of Cable 1st layer 2nd layer 3rd layer 4th layer
Rated line pull per layer 8000 lbs. 6540 lbs. 5550 lbs. 4750 lbs.

 

The smaller the diameter of the drum, the faster the layers pile up and the faster your pulling power drops. On the other hand, a larger diameter drum means that the size of the winch housing has to increase in order to make room for the cable wrapped around the drum. For vehicles with tight mounting spaces, this can be a problem.

Same thing goes for drum length. The shorter the winch drum, the faster the pulling power will drop. Yet the longer the winch drum, the bigger the winch housing needs to be.

The drum diameter and length of ProMark Offroad winches are designed to provide the best combination of optimal line speed and compact housing dimensions.

Dynamic vs Mechanical Winch Brakes

The Outback Series winches have both dynamic and mechanical brakes.

The Outback Series winches have both dynamic and mechanical brakes.

A dynamic winch brake uses the resistance from the winch motor to prevent the drum from turning. It’s a natural braking mechanism built into the winch.

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Unless you plan to use your winch as a hoist, a dynamic brake should be all you need. Winches with dynamic brakes should never be used for a hoist system.

The excessive force on the winch cable caused by hoisted weight will cause the line to “bleed” out, making the load unsafe and endangering the user. If you plan to use your winch as a hoist, make sure the winch you purchase is specifically designed for this purpose.

A mechanical winch brake is a physical brake, like on a car, that stops the drum from turning when there is a load on the cable. Mechanical brakes are optional on most ATV winches, although some winches come with both dynamic and mechanical brakes.

Which Is Better: Dynamic or Mechanical?

The dynamic braking system is sufficient for most ATV winch owners; however, a mechanical brake can be installed in addition to the dynamic brake in order to offer better control and prevent roll back. The XT 1500 winch and the Outback Series winches are designed with a mechanical winch braking system.

The downside of a mechanical brake is the added weight (winches are heavy enough as it is) and the increased size of the winch body. The weight and size issue can be a big deal for ATVs and UTVs with tight mounting spaces.

If you plan to use your winch as a hoist, however, you will need a winch with a mechanical brake to securely hold a vertical load.

How to Install Rubber Line Stopper on Winch Cable

Winch Line Stopper for Steel Cable

Winch Line Stopper for Steel Cable

For most of us it’s a no-brainer, but if you’ve never installed a rubber stopper on a winch cable before, it might feel like the proverbial camel through the eye of a needle. Sticking the metal looped end of the cable through the opening in the rubber line stopper is next to impossible.

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Some guys lube down the cable and stopper and try to force the loop through the opening. Depending on how big the loop is and how big the opening is, this method could split the stopper or damage the cable. Even if you’re able to force the loop through the stopper, it takes just as much—or more—time and effort as it does to do things the right way.

So how do you get the rubber stopper over the cable? The right way to get the stopper onto the cable is to unwind the cable (yup, all the way), remove the metal bolt or pin that attaches the cable to the drum (don’t lose the pin!), and slip the stopper onto the end of the cable that attaches to the drum. Make sure the flat side of the stopper is facing towards the fairlead. The beveled side of the stopper should be facing outward, towards the winch hook.

After you snake the stopper through the cable, reattach the end of the cable to the drum, using the metal bolt or pin, and wind the cable back onto the drum in neat, even layers.

It may seem like a lot more work to unwind the entire cable, but in the long run, doing things the right way is simpler and easier than trying to force the cable loop through the stopper. It could also save you the trouble of getting a new stopper or cable if your “shortcut” backfires.

Planetary Gear, Worm Gear, and Spur Gear Winches

There are 3 basic types of winch gears: planetary, worm, and spur gears. The gear train’s job is to reduce the high speed power from the winch motor into a low speed, high torque pulling force. The main difference between these 3 types of winch gears is their transfer efficiency.

    Planetary Gear Train

    Planetary Gear Train

  • Planetary Gear Winch

    Transfer Efficiency: 65%

    A planetary gear winch is the most popular and most affordable type of offroad winch. It offers strength, smooth operation, and good resistance to torque loads. They also allow for higher gear ratios than worm or spur gears. A planetary winch is typically the most compact of the three types of gear trains, making it the most practical type of winch for ATVs and vehicles with restricted mounting space.

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    Planetary gears got their name because of their design, similar to a sun with revolving planets. A braking system is required to hold the load.

  • Worm Gear Train

    Worm Gear Train

  • Worm Gear Winch

    Transfer Efficiency: 35-40%

    Worm gear winches are known for their endless endurance and high reliability. They are also self-braking, eliminating the need for a braking system. On the other hand, they are also mechanically less efficient than either planetary gear or a spur gear winch.

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    Compared to planetary winches, worm winches are heavier, more expensive, and more difficult to mount. Worm gear winches also have a slower line speed (especially in a no-load situation) and a higher amp draw than planetary winches.

  • Spur Gear Train

    Spur Gear Train

  • Spur Gear Winch

    Transfer Efficiency: 75%

    A spur gear winch is the most efficient type of winch, with a fast line speed and high reliability. Unfortunately, space requirements make it impractical to mount on some vehicles. If your vehicle has space restrictions for mounting a winch, the design of the spur gear winch may require extensive modifications to your vehicle.

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    Also, if you’re set on a spur gear winch, expect to pay a little extra. Very few spur gear winches are designed for offroad use. As with the planetary winch, a braking system is required to hold the load.

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Photo Credits: “Planetary Gear Train” is licensed under the Creative Commons Attribution ShareAlike 3.0 License at http://commons.wikimedia.org/wiki/File:Train_planetaire.png.

Electric Winch Motors: Permanent Magnet and Series Wound Motors

The Midnight Series Recovery Winch uses a series wound motor for heavy duty winching.

The Midnight Series Recovery Winch uses a series wound motor for heavy duty winching.

There are two basic types of DC motors used for electric winches. The first type is a Permanent Magnet Motor and the second type is a Series Wound Motor.

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1. Permanent Magnet Winch Motors

With a permanent magnet motor, the drain on your battery is less than a series wound motor, but they also generate more heat than series wound, so there’s a greater chance that your winch motor will overheat.

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Because of this tendency to overheat under heavy loads, the permanent magnet motor is best suited for light to medium duty winching. For Jeep and truck winches, light to medium duty is generally regarded as pulls up to 9500 pounds.

You can compensate for this tendency to overheat by taking frequent breaks during the winching process to let the motor cool down. The heavier the load and the longer the pull, the more breaks you’ll need to take.

2. Series Wound Winch Motors

Series wound motors–such as those used in the Silverback Winches and Midnight Recovery Winches–are designed for heavy duty winching. They are powerful and efficient at high speeds. A permanent magnet motor uses less amp draw than a series wound motor; however, as the permanent magnet motor heats up, the power will drop as the amp draw increases. With a series wound motor, on the other hand, the amp draw will stay the same throughout the pull. Keep in mind that winches with series wound motors tend to cost more than winches with permanent magnet motors.

A Note About Horsepower

The higher the horsepower, the more torque and power that the winch motor will have. Horsepower directly affects line speed and pulling power.

A Note About Amp Draw

The max amp draw for a winch motor is typically around 400. Higher amps than that would damage the battery or power source. To lower the amps, the gear ratio must be increased. This reduces the amp draw on the motor, but unfortunately it also reduces the line speed, making for a slower winching process.

For heavy rigs, series wound motors are your best bet. They handle heavy loads and longer pulls with ease. The vast majority of truck and Jeep winches on the market today are series wound winches.

Electric Winch Components

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Electric Winch Components – Parts Diagram 1

Structural Components of an Electric Winch

Structural Components of an Electric Winch - Diagram 1

Motor – In a typical setup, the winch motor runs off your vehicle’s battery. This battery power transfers from the winch motor to the gear train (also known as the drive train), which in turn causes the winch drum to rotate and the steel cable to spool in and out.

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Solenoid (also known as Contactor) – The solenoid controls the direction that the drum will rotate. The solenoid receives power from your vehicle’s battery and protects the motor from overheating.

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An integrated solenoid is permanently mounted over the winch (such as the Silverback winch package), and a remote solenoid is mounted separately from the winch (such as the XT winch package).

Steel Cable – The steel cable is wrapped around the winch drum and fed through the roller fairlead on the front of the winch. Synthetic rope is an alternative winch cable preferred by some offroaders for its ease of handling and safety.

Roller Fairlead – The fairlead guides the steel cable during the winching process and prevents the cable from getting snagged in moving winch parts. An aluminum fairlead is recommended for use with synthetic cable.

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Electric Winch Components – Parts Diagram 2

Structural Components of an Electric Winch - Diagram 2

Structural Components of an Electric Winch - Diagram 2

Winch Drum – The winch drum is the spool wrapped with steel cable that rotates during the winching process and winds the cable in or out.

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Internal Brake – The brake is the mechanism located inside the winch drum that keeps the load from slipping.

Gear Train (also known as Drive Train) – The gear train converts the power from the winch motor into a pulling force. The gear ratio is a major factor in the line speed.

Freespool Clutch – The freespool clutch allows you to engage or disengage the drum from the gear train. The freespool (disengaged) position allows you to freely spool out the cable by hand. The engaged position allows you to power out the cable.

Color Coded Winch Wiring

Never installed an electric winch before? No problem. PROMARK OFFROAD winches (formerly Gorilla Winches) come with color-coded wiring to make installation quick and easy. You don’t need a degree in electrical wiring to install one of our winches.

Just to make it foolproof, we’ve designed each of the wires to be a different color: red, blue, black, or yellow. Each wire attaches to the same color winch post (i.e. yellow wire to yellow winch post).

This is winch wiring for dummies at its best. See the pics below for proof.

Winch Wiring Diagram

Winch Wiring from the Contactor


Wiring to the ATV Winch (Trail Series)

Wiring to the ATV Winch (Trail Series)