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Old 03-16-2011, 04:49 PM   #1 (permalink)
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I tried looking up in the OEM service manual the procedure for changing out the front fork oil on the 1500 and it appears to show me the fork assembly needs to be removed?. Is this right?. I couldn't find a plug in the illustration. Any help would be most appreciated!!. Allan
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Old 03-16-2011, 06:48 PM   #2 (permalink)
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Easier on a GL1500. The top caps are easier to take off. Most of them have a 10mm drain bolt, its the one just above the allen bolt this guy is working on.

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Old 03-16-2011, 07:01 PM   #3 (permalink)
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BenMC wrote:
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Easier on a GL1500. The top caps are easier to take off. Most of them have a 10mm drain bolt, its the one just above the allen bolt this guy is working on.



Ok so filling them is????
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Old 03-16-2011, 11:01 PM   #4 (permalink)
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After you get all the oil out you just remove the Air valves then the new oil is added through the air valves on the 1500 you want it to be 5.5 inches from the top. Look it up in the tech posts Rudy has a real engenious way of doing it otherwise the service manual says (right fork 320cc/10.8oz/11.4 imperial oz)

(left fork 325cc/10.9oz/11.2 imperial oz)that's from my Honda 1993 GL1500 service manual page 2-6.
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Old 03-17-2011, 03:31 AM   #5 (permalink)
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DO NOT and I repeat DO NOT fill it 5.5 inches from the top. This figure comes from people misreading the instructions from the Progressive fork spring installation. No where on there does it say to fill GL1500 fork tubes to 5.5 inches from the top. They have only published 1 set of instructions that cover ALL street bike fork spring installations. It tells you to follow your service manual for proper filling. The properlevel is also with the springs out and the forks fuly collapsed. If you fill it to 5.5 inches from the top with the forks extended and the springs in, this is about 10 inches overfilled, guaranteed to give you one of the roughest rides you have ever experienced and will probably kill your fork seals. Read this thread if you plan on doing it through the schrader/air valve: http://www.goldwingfacts.com/forums/forum1/110432.html



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Old 03-17-2011, 10:19 AM   #6 (permalink)
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pwhoever wrote:
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DO NOT and I repeat DO NOT fill it 5.5 inches from the top. This figure comes from people misreading the instructions from the Progressive fork spring installation. No where on there does it say to fill GL1500 fork tubes to 5.5 inches from the top. They have only published 1 set of instructions that cover ALL street bike fork spring installations. It tells you to follow your service manual for proper filling. The properlevel is also with the springs out and the forks fuly collapsed. If you fill it to 5.5 inches from the top with the forks extended and the springs in, this is about 10 inches overfilled, guaranteed to give you one of the roughest rides you have ever experienced and will probably kill your fork seals. Read this thread if you plan on doing it through the schrader/air valve: http://www.goldwingfacts.com/forums/forum1/110432.html


I'm in total agreement!!. I'm just changing/checking the oil in the front. And your 100% correct on not filling it 5.5 inches from the top!!. Here below is an inset directly from the Progressive web site about filling shocks " AFTER " you have removed the springs from your front end!!!.:re adit:

Fork oil level/volume should be checked according to the steps outlined
in your authorized shop manual. Measurement of your fork oil
by level is the preferred method. However, some manuals only specify
a volume measurement. Due to the design of a progressive wound
fork spring it will displace more oil thus requiring a maximum oil
level of 5.5" (140mm). Caution: This is not a recommendation,
it is only a precautionary statement
. If your manual specifies an oil
level higher than 5.5"
(140mm) set the oil level
at 5.5" (140mm). (Oil
level is the distance
from the top of the
fork tube to the top of
the oil with the fork
completely collapsed
and the fork spring removed.

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Old 03-17-2011, 10:49 AM   #7 (permalink)
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Progressive couldn't have made that more confusing if they tried.
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Old 03-17-2011, 08:31 PM   #8 (permalink)
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Ok, with Progressive fork springs what's the recommended amount (in cc's) for the fork tubes? I'm going to be changing mine soon on my '98.
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Old 03-17-2011, 08:57 PM   #9 (permalink)
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Even though the amounts are important, as long as you set the correct level, you will be fine. Each fork will have different amounts because of different components but the measured level will be the same in both. The correct amounts only come into play if the forks are completely drained which wont happen using the drain plug method. There will still be some left behind. But setting the correct level will work fine. Take a look at this thread and go down to the post by Satan. I would consider him the guru of gl1500 fork levels: http://goldwingfacts.com/forums/view_topic.php?id=66332
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