Shindaiwa Speed-Feed Trimmer Heads Repair Guide

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Shindaiwa Speed-Feed Trimmer Heads Repair Guide Powered By Docstoc
					Shindaiwa has introduced an innovative new style of trimmer head that does not require any trimmer
head dis-assembly to reload cutting line.

These trimmer heads are called Speed-Feed trimmer heads, and they are compatible with many kinds of

We'll show you how easy reloading is with a Speed-Feed head, explain how to fit one to any compatible
trimmer, and demonstrate trimmer head installation steps.

Installing a new Speed-Feed trimmer head should take less than five minutes with the help of this article and
video demonstration.

How to Load a Speed Feed Trimmer Head

There are a few steps involved in reloading a Speed-Feed trimmer head, but a Speed-Feed reload only takes
about 30 seconds!

1. Line Up the Trimmer Head Arrows with the Eyelets

      Shindaiwa Speed-Feed trimmer heads have two arrows on the top of their heads set at 180 º.
      The first step to reload the line is to line up the arrows with the trimmer head eyelets as shown in the
      picture above. Light will be visible on the other side if you look through the holes.

2. Load Line Through One Side of the Trimmer Head

      Guide a very long length (check trimmer head instructions) of line through one of the eyelets out to
      the other side.

3. Even Out Line Lengths

      Extend both ends of the line all they way out until their lengths match. You will have to step several
      feet away from the trimmer to do this.
      Walk back toward the trimmer and release the lines.

4. Load the Line by Twisting the Trimmer Head

      Twist the top of the trimmer head in the indicated direction.

      The cutting line will automatically load in both ends of the trimmer as you twist the head!

Loading trimmer line with a Shindaiwa Speed-Feed trimmer head takes under 30 seconds.

Speed-Feed Trimmer Head Compatibility
Shindaiwa Speed-Feed trimmer heads fit hundreds of trimmer models, because each new head includes a
versatile set of thread adapters and bolt adapters.

These adapters fit standard arbors common to professional-use gasoline trimmers and other models.

Some gasoline homeowner trimmer models may use standard (compatible) arbors, but many homeowner
models use unique parts to affix trimmer heads that make after-market compatibility impossible.

Click the link below for more information about trimmer head compatibility:

        "How to Buy a Compatible Trimmer Head"

Two of the three Speed-Feed trimmer head models are made forstraight shaft trimmers, and one of the
trimmer head models is made for curved shaft trimmers. Straight and curved shaft trimmer head arbors are
threaded in opposite directions, because their trimmer heads actually spin in opposite directions.

Straight Shaft Trimmer Compatibility

Two of the three Speed-Feed trimmer head models are made for straight shaft trimmers. Straight shaft
trimmers with standard arborsare left hand threaded.

The female thread adapters and male bolt adapters included with each straight shaft trimmer head are
threaded accordingly.

Female thread adapters included:

       8mmx1.25LHF
       10mmx1.0LHF
       10mmx1.25LHF

Male bolt adapters included:

       7mmx1.0LHM
       8mmx1.25LHM
       10mmx1.25LHM

The straight shaft heads fit any trimmer that has a standard arbor in any of the above dimensions.

The 375 model holds approximately twelve feet of cutting line, and the 450 model holds approximately
twenty-four feet of cutting line.
Visit each trimmer head's parts page for a more detailed compatibility list:

     Shindaiwa 375 Speed-Feed Trimmer Head
     Shindaiwa 450 Speed-Feed Trimmer Head

The difference between the 375 model and the 450 models is size.

Curved Shaft Trimmer Compatibility

Curved shaft trimmers use a direct drive design to turn their cutting heads, whereas straight shaft trimmers
have a set of gears just above the trimmer head that transfers power from the engine. Curved shaft and
straight shaft trimmers spin in opposite directions because of this difference.

Likewise, their arbor bolts are threaded in opposite directions so that their heads will stay tight under the
centrifugal force of trimmer operation.

Curved shaft trimmers with standard arbors are right hand threaded. The female thread adapter and male
bolt adapter included with each curved shaft trimmer head are threaded accordingly.

Female thread adapter included:

        3/8"-24RHF

Male bolt adapter included:

        8mmx1.25RHM

The curved shaft heads fit any trimmer that has a standard arbor in any of the above dimensions.

Visit the curved shaft trimmer head's parts page for a more detailed compatibility list:

     Shindaiwa 375 Speed-Feed Trimmer Head

Trimmer Head Size and Engine Size

In addition to matching the correct shaft type trimmer head to your trimmer, you'll also have to match the
trimmer head size to your trimmer's engine size.

For the Shindaiwa Speed-Feed Trimmer heads:

        The two "375" models (one for straight shaft trimmers, the other for curved shaft) can be used with
         trimmers of any engine size.

        Although owners of larger trimmers (24cc and up) can opt to use the larger trimmer head, many
        prefer to use the smaller heads on larger trimmers for the higher RPM's.

        The "475" model is for straight shaft trimmers only, and it should only be used on trimmers with 24cc
         engines or larger.

Changing the Speed-Feed Thread Adapter
Your Speed-Feed head will come with one of the female thread adapters already installed, the 10mmx1.25

You will not have to change out the female thread adapter in two situations:

         If your trimmer's arbor is female (accepts a male bolt).

         In this case, all you have to do is select the correct male bolt adapter that came with your trimmer
         head. Screw it into the thread adapter already installed in head and the head will be ready to install on
         your trimmer.

         If your trimmer's arbor is a male, 10mm1.25 bolt.

         The thread adapter for this bolt is already installed in your Speed-Feed head.

If your trimmer needs a female thread adapter of a different size, then you need to change the thread
adapter in the Speed-Feed head.

Changing the thread adapter requires completely dismantling the trimmer head, but it is very easy to do and
should only take about three minutes.

Here are the steps for changing the Speed-Feed thread adapter:

1. Pull the cap off.

2. Separate the head.
      Two tabs on the trimmer head must be pressed to separate its two halves. Press each tab on the side
      of the trimmer head one at a time, then pull the assembly apart.

3. Set the bottom half of the trimmer head aside.

4. Remove the spool.

5. Remove the thread adapter cap.
6. Press the thread adapter out with a hammer.

7. Install the correct adapter thread.
8. Reassemble the trimmer head by replacing parts in the reverse order that you removed them.

These Speed-Heads are conveniently designed so that they can not be reassembled incorrectly. The design
simply will not allow the two sides to close unless all the parts are installed properly.

Also, these trimmer heads can not be reassembled with cutting line still installed in the spool. Again,
changing a thread adapter should only take about three minutes.

How to Install the Speed-Feed Trimmer Head

Once you have the thread adapter and/or bolt adapter that you need on your new Speed-Feed trimmer head,
all you have to do is install it on your trimmer.

Installing your new trimmer head on your trimmer should take less than a minute or two.

Here are the steps:

1. Lock your trimmer's spindle.

      Most trimmers will have a small hole on their spindle right above the trimmer head. You'll have to spin
      the trimmer head so that the outer and inner holes line up.

      Insert a small screwdriver into the spindle hole to lock it.

2. Spin the old trimmer head off.

      With the spindle locked, your old trimmer head should twist right off with a little force.

3. Install the trimmer head spacer (if needed).
      If your trimmer's arbor bolt is especially long, or if it has splines exposed at its base, you will also
      need to install the trimmer head spacer that comes with your new Speed-Feed trimmer.

4. Screw the new trimmer head on.

5. Tighten the trimmer head into position.

      You'll need to insert that screwdriver into the spindle holes once again to lock the trimmer head.

      Once the trimmer head is locked with a screwdriver, tighten your new trimmer head on by twisting it
      with some added pressure.

Visit our  Trimmer Heads page here at to view our selection of trimmer head and
other    Power Tool Accessories.

Also, here's those links for the Speed-Feed   Shindaiwa Trimmer Heads once again.

Straight shaft:

      Shindaiwa 375 Speed-Feed Trimmer Head
      Shindaiwa 450 Speed-Feed Trimmer Head

Curved shaft:

         Shindaiwa 375 Speed-Feed Trimmer Head

Get your Speed-Feed head today and you can be loading cutting line faster and easier than you ever

Description: Speed-Feed trimmer heads make it possible to load trimmer line in under 30 seconds, and installing a compatible trimmer head on your trimmer only takes minutes.
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