Changing Fluid on GL1500 Air Shock


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Richman2000
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Changing Fluid on GL1500 Air Shock

Post by Richman2000 »



I’ve been reading about changing the fluid on the GL1500 Air Shock. It’s the only fluid on the wing that I haven’t replaced. You can refill it with Honda Suspension fluid, or ATF. I chose to use 140ml of ATF.
Remove the right luggage compartment, along with all the other nearby Tupperware and seat.


Remove the airline from the top of the shock


Compress the spring and remove by sliding it down. Be careful to keep the open hole facing upward to reduce a chance of spillage.
After removing the shock, hold it over a container with the hole facing down, then extend and compress the shock several times. The fluid will spray out of the shock. It can be messy if your not careful. This was the “fluid” that came out of the shock. Only about 90ml.


I used regular ATF to fill the shock. The measuring cup, and fill bottle came from the dollar store. After measuring out 140ml of ATF, I poured it into the bottle.


I secured one end of the shock so that I could extend and compress the other end of shock. This is also a very good time to replace the shock boot it it’s in the condition mine is. That’s another part I need to pick up.




Place the tip of the bottle into the hole, and squeeze the bottle while extending the shock. It will suck the fluid inside. Sorry for the fuzzy pic.


After filling the shock, compress it again and replace it into its original location. I took it for a short ride, didn’t really feel a difference, but time will tell.
Ride Safe,
Rich


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Re: Changing Fluid on GL1500 Air Shock

Post by minimac »

As long as guys don't confuse using ATF in the shock for fork oil in the forks. As always, nice write up and pics!
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Re: Changing Fluid on GL1500 Air Shock

Post by Richman2000 »

Minimac, Thanks for the good words. When I was writing this up, I was figuring on peoples common sense. Now that I think about it, "DO NOT USE ATF IN YOUR FORKS".

Ride Safe,
Rich
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keith3po
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Re: Changing Fluid on GL1500 Air Shock

Post by keith3po »

Got my rear shocks off at the moment and there isn't any oil in the air shock and I can't find any reference to it in my Haynes manual.
Is it for lubrication or does it work the suspension?
You put 140ml in is it the same for all models?
Thanks for the write up I didn't know it had oil in it. :(
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Richman2000
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Re: Changing Fluid on GL1500 Air Shock

Post by Richman2000 »

It should be the same. When you removed the air line from the shock, did you try pumping it? It compresses and expands easily. If no oil came out, then I think you where 140ml low on oil. Try filling it and see what happens. I don't know the function of the fluid.

Ride Safe,
Rich
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Re: Changing Fluid on GL1500 Air Shock

Post by keith3po »

Richman2000 wrote:It should be the same. When you removed the air line from the shock, did you try pumping it? It compresses and expands easily. If no oil came out, then I think you where 140ml low on oil. Try filling it and see what happens. I don't know the function of the fluid.

Ride Safe,
Rich
Yep it pumps really easy and definitely no oil in there i'll put some in when I rebuild the bike thanks again. :D
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keith3po
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Re: Changing Fluid on GL1500 Air Shock

Post by keith3po »

Thanks again for this, worked a treat. :D


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Re: Changing Fluid on GL1500 Air Shock

Post by drebudrebu »

Where can you find the shock boot? I have been on multiple sites and all I can find is the whole assembly for over $200, not the boot by itselft.
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Re: Changing Fluid on GL1500 Air Shock

Post by bjatwood »

I got a shock boot from O'Rielly's Auto parts. Had to shorten the boot a bit, but the boot was less than 10 bucks. ;)
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Re: Changing Fluid on GL1500 Air Shock

Post by Dogsled »

bjatwood
You wouldn't happen to have the number for the O'reillys boot you bought in your records by chance???
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Re: Changing Fluid on GL1500 Air Shock

Post by bjatwood »

Try RS1927. It's like 5.00 bucks and you can shorten it if you need too.
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Re: Changing Fluid on GL1500 Air Shock

Post by Dogsled »

thanks, I got a used one coming with the boot torn.
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Re: Changing Fluid on GL1500 Air Shock

Post by GBKid »

can you use Moly 60 paste to lightly lubricate the smooth portion of the lower air shock mounting bolt?
Last edited by GBKid on Sat Jul 04, 2015 7:10 pm, edited 1 time in total.
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Re: Changing Fluid on GL1500 Air Shock

Post by GBKid »

What are the torque specs for the upper and lower air shock mounting bolts?
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Re: Changing Fluid on GL1500 Air Shock

Post by WingAdmin »

GBKid wrote:can you use Moly 60 paste to lightly lubricate the smooth portion of the lower air shock mounting bolt?
Grease or Moly 60 paste will work fine for this application.
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Re: Changing Fluid on GL1500 Air Shock

Post by WingAdmin »

GBKid wrote:What are the torque specs for the upper and lower air shock mounting bolts?
Left side:
Upper bolt: 17 ft-lb
Lower bolt: 51 ft-lb

Right side:
Upper and lower bolts: 17 ft-lb
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Re: Changing Fluid on GL1500 Air Shock

Post by millerized »

I see here you say never to use ATF in the front forks....and yet in the "How to rebuild your forks" DIY page (viewtopic.php?f=14&t=16118 Step #45) it states it is an acceptable substitute for fork oil.
Not that I can't afford either one, but....just a bit of clarification across the board.
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Re: Changing Fluid on GL1500 Air Shock

Post by WingAdmin »

ATF is perfectly fine to use as fork oil, it is equivalent to about 10 weight fork oil. Fork oil itself is often just relabeled hydraulic oil.

In fact, up until the GL1200, Honda service manuals specified ATF for use in the forks. For the GL1500 onward, they clued into the fact that they could do better by specifying the use of "Pro-Honda Suspension Fluid SS-8 or Equivalent", and then sell their overpriced hydraulic fluid and make a few bucks. :)

Incidentally, the ""Pro-Honda Suspension Fluid SS-8" fluid is 10-weight hydraulic fluid - the same as ATF.

Last time I did my forks I put 15 weight oil in them to firm them up a bit. I think next time I'll go back to 10 weight oil.
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Re: Changing Fluid on GL1500 Air Shock

Post by millerized »

WingAdmin wrote:ATF is perfectly fine to use as fork oil, it is equivalent to about 10 weight fork oil. Fork oil itself is often just relabeled hydraulic oil.

In fact, up until the GL1200, Honda service manuals specified ATF for use in the forks. For the GL1500 onward, they clued into the fact that they could do better by specifying the use of "Pro-Honda Suspension Fluid SS-8 or Equivalent", and then sell their overpriced hydraulic fluid and make a few bucks. :)

Incidentally, the ""Pro-Honda Suspension Fluid SS-8" fluid is 10-weight hydraulic fluid - the same as ATF.

Last time I did my forks I put 15 weight oil in them to firm them up a bit. I think next time I'll go back to 10 weight oil.
Figured you had it right, since it was YOUR bike that was draining ;)

I've mixed viscosities before, when 15 was too harsh and 10 wasn't enough.

Honda doing something like that to make money? Nawh, never happen. Next time you'll tell me HD doesn't rebrand Chinese stuff and resell it :roll:


:lol: :lol:
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Re: Changing Fluid on GL1500 Air Shock

Post by nightprowl3r »

Advance auto #sa1997 shockmate $8.09 needs cut to size and fits nice and tight
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Re: Changing Fluid on GL1500 Air Shock

Post by guitarzan »

Just any kind of Transmission Fluid will do?

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Re: Changing Fluid on GL1500 Air Shock

Post by WingAdmin »

guitarzan wrote:Just any kind of Transmission Fluid will do?

Thanks
Frank
Basically any quality ATF, which itself is just hydraulic fluid.
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Re: Changing Fluid on GL1500 Air Shock

Post by guitarzan »

I was looking and there seemed to be so many different types I just wanted to make sure I wasn't going to mess anything up.

Thank you.

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Re: Changing Fluid on GL1500 Air Shock

Post by guitarzan »

I just want to be clear about this. I can use 10 weight hydrolic fluid on my rear right air shock and on the front forks? Now with that ATF you have a kinds of different kinds, with detergent in it too. Isn't brake fluid hydrolic fluid too?

I just want to know what to use. Thank you guys

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Re: Changing Fluid on GL1500 Air Shock

Post by MikeB »

guitarzan wrote:I just want to be clear about this. I can use 10 weight hydrolic fluid on my rear right air shock and on the front forks? Now with that ATF you have a kinds of different kinds, with detergent in it too. Isn't brake fluid hydrolic fluid too?

I just want to know what to use. Thank you guys

Frank
Frank, I'm confused about it too so do not feel bad. Transmission fluid comes in many flavors and varieties. You will see bottles labeled ATF, Type F, Dexron, Dexron II, Mercon, etc. etc. etc. Since it is really important to know what it is that you put in your shocks, I figure it is easiest to listen to the people that manufacture shocks. I know that ATF can be used in shocks and forks but I prefer to use the fluid that is labeled as shock or fork oil. It makes it so much easier for me that way.


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