Power Take Off (crankshaft) Pulleys
The first two rows of pictures show typical PTO (Power Take Off) pulleys we manufacture that allow for the attachment of a High Output Second (dual)
alternator to most engine manufacturer crankshafts. It is available in twin V-belt or 8 Groove Serpentine configurations. The PTOs on the top (first)
row show an optional ZRD blue finish. The picture on the middle row shows the standard (normal PTO) finish. We stock PTO pulleys that fit (bolt on to)
most Yanmar engine crankshafts. For other engine manufacturers, we make the PTO on demannd. Standard delivery is 2-6 weeks.
Below the standard crankshaft PTOs (bottom - third row) are examples of three custom PTOs. The first picture is a 4 sheave PTO pulley that is designed for significantly larger engines that are able to feed multiple power take off options. This type of PTO requires additional horsepower and the availability of room around the engine in order to allow for the attachment of the options.
In the middle the photo shows how ZRD is able to custom create (special order) a PTO pulley or a new replacement pulley that will be the combination of the main (original) crankshaft pulley (one or two sheaves) plus a 2 sheave PTO. The end result is a new bolt replacement pulley for the crankshaft with three or four sheaves that will accommodate all of your needs to mount v-belts. This example was designed and manufactured to have a single 3/8" sheave to match the original crankshaft and then add two 1/2" PTO sheaves.
Pictured at the far right is an example of a customer's requirements that needed a very specific solution. It had very different specifications than is normally required of standard PTOs. Note there are multiple sheaves with different diameters and widths. The finished PTO is shown bolted on to the existing engine crankshaft pulley. Part of the PTO fits inside the crankshaft pulley with very tight tolerances. It fits like a tight leather racing glove. The crankshaft pulley and the PTO are bolted together with Titanium bolts.
All of our Pulleys (Standard and Custom) are custom made by hand locally at ZRD in the USA (truly Made in USA) on CNC machines. Cost of materials, labor, and especially machine time is extremely expensive. It is a very detailed and expensive manufacturing process. The expenses of producing one-offs PTOs requires considerably more expense than the standard prospective customer may know and is difficult to explain without them knowing what is involved when they place their initial inquiry. Our "in-stock" PTOs are slighly less expensive due to quantity production runs, but still more expensive than most realize.
Depending on your situation, we may ofer to custom create (requires a special order) a new replacement
pulley for most items attached to your power plant or accessories in order to have a proper total solution.
The costs associated with this option varies widely depending on what is required, complexity of fabrication
and the man hours that may be required. A free phone consultation is always available in order to get initial
estimates for your situation.
Special Note: The following service is not provided to all manufacturers' engines. It is displayed here to show ZRD capabilities. This limitation is due to the additional side loading (mostly on water pump components) created by alternators that exceed 94 amps. This has reportedly led to premature engine failures. ZRD will provide this specific service only if authorized by the original engine manufacturer. This restriction is due to factors beyond our control that may lead to overloading and failures.
The first photo (top right) is an installation that had it's 3/8" single sheave crankshaft pulley modified to become a 1/2" single sheave version and a new 1/2" water pump pulley was made to replace it's previous 3/8" one.