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Fox dpx2 service

PB Forum :: Mechanics' Lounge
Fox dpx2 service
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flag Tciva77
Posted: May 6, 2019 at 20:10 Quote
Hey guys !

I just noticed that my dpx2 needed a bleeding.
But when reading the full process how to from fox,
I reach the step when you have to refill the ifp chamber.
But I can’t see wich adaptator you need to fill this chamber
Without going through the nitrogen process.
When servicing my vivid air and coil rock shox made the special
Adaptator so you were able to pressurize this ifp chamber with
Your high pressure pump.
Anyone of you have an idea on how to service this shock.

Cheers !
flag ZSW
O+
Posted: May 6, 2019 at 21:36 Quote
This is the tool that I use

https://www.ebay.com/i/231897570435?chn=ps&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=231897570435&targetid=596465896308&device=m&adtype=pla&googleloc=9023224&poi=&campaignid=1689407489&adgroupid=74365778308&rlsatarget=pla-596465896308&abcId=1140476&merchantid=8446024&gclid=Cj0KCQjwtr_mBRDeARIsALfBZA51Q_M4TVMKtxqOT-d-44pJe1q3V3ReOBFEfXayI6egvbi7fyNlmC4aAjB6EALw_wcB

I have rebuilt several dpx2 shocks with it and while it’s not as nice as the real fox tools it works totally fine. You will also need a 4mm Allen with a hole through it ( like a tamper resistant Allen key).

It’s worth it to do some reading on how the pellet and pellet retainer work. I’d also stock up on pellets because I went through a few until I sorted out the process
flag Tciva77
Posted: May 6, 2019 at 23:40 Quote
Thank you for the details.
What is the fox tool your talking about?
I’ve been searching on universal cycle but can’t figured which one it is.
I would rather use the « official » tool.
flag ZSW
O+
Posted: May 7, 2019 at 12:30 Quote
Pretty sure this is the correct tool

https://www.polyperformance.com/fox-nitrogen-safety-needle-802-01-000-kit?utm_source=google&utm_medium=cse&utm_term=FOX-802-01-000-KIT&gclid=CjwKCAjw2cTmBRAVEiwA8YMgzSrVPxv1FqFx7EumOAGGEwo2qph7axHitOSO4EEqY8EQWGX8u4j8rxoCCqQQAvD_BwE

The correct tool part numbers from fox should be included with the rebuild information on their site. Those tools are designed to work with their nitrogen setup though, so you will need to incorporate a schrader valve into the assembly if you want to use a shock pump
flag Tciva77
Posted: May 7, 2019 at 20:23 Quote
Ok thank you for the advices ????????????
flag woodsroamer
O+
Posted: Feb 6, 2020 at 7:50 Quote
Do you guys use these tools to put air instead of nitrogen? I need to service my DPX2, and I'm looking for a serviceable shock without dealing with nitrogen.
flag ZSW
O+
Posted: Feb 6, 2020 at 14:54 Quote
woodsroamer wrote:
Do you guys use these tools to put air instead of nitrogen? I need to service my DPX2, and I'm looking for a serviceable shock without dealing with nitrogen.

Yes I use air instead of nitrogen. I have never used nitrogen and don’t notice any negative effects. The important part is getting a good air free bleed and getting the ifp depth and pressure correct.
flag lance-h
O+ FL
Posted: Feb 8, 2020 at 21:13 Quote
Buy a float X2/DHX2 then you can use a regular shock pump your IFP. Most of fox's other shocks will use needle style.
flag woodsroamer
O+
Posted: Feb 12, 2020 at 20:05 Quote
Yes I use air instead of nitrogen. I have never used nitrogen and don’t notice any negative effects. The important part is getting a good air free bleed and getting the ifp depth and pressure correct.[/Quote] That's great to know.

lance-h wrote:
Buy a float X2/DHX2 then you can use a regular shock pump your IFP. Most of fox's other shocks will use needle style.
Yeah, I learned that X2 takes air. I thought about getting it, but I already have a DPX2. It makes sound like air mixed in the damper. I wasn't sure I want to keep it or not. I think I'll get the tool and rebuild by myself. Not hard to put 150psi of air in the IFP chamber. I like my DPX2 setup when it's working good.

Thanks for your quick responses and tips guys very helpful.
flag ZSW
O+
Posted: Feb 12, 2020 at 21:16 Quote
Dpx2 is a pretty good shock to play around with. Definitely easier to work on than an X2. If it’s all sloshy sounding it’s got nitrogen in the oil. Bad news is that the oil is pressurized now too, be careful opening the shock even after letting the nitrogen out of the ifp. Open everything very slowly and as soon as you hear or see oil coming out stop and let the pressure bleed off.

Schmidty racing also sells schrader valves that can be used to convert the plug/needle system to a schrader valve.

https://www.schmidtyracing.com/Nitrogen-Reservoir-Schrader-Valves-p/n-shr.htm
flag skycries57
Posted: Apr 4, 2020 at 7:16 Quote
ZSW wrote:
Dpx2 is a pretty good shock to play around with. Definitely easier to work on than an X2. If it’s all sloshy sounding it’s got nitrogen in the oil. Bad news is that the oil is pressurized now too, be careful opening the shock even after letting the nitrogen out of the ifp. Open everything very slowly and as soon as you hear or see oil coming out stop and let the pressure bleed off.

Schmidty racing also sells schrader valves that can be used to convert the plug/needle system to a schrader valve.

https://www.schmidtyracing.com/Nitrogen-Reservoir-Schrader-Valves-p/n-shr.htm

LBS wants to charge me $250+ in my dpx2 for service all seals and nitrogen recharge. Is this fair? I'm 200 from a brand new one. Thoughts?
flag ZSW
O+
Posted: Apr 4, 2020 at 10:33 Quote
skycries57 wrote:

LBS wants to charge me $250+ in my dpx2 for service all seals and nitrogen recharge. Is this fair? I'm 200 from a brand new one. Thoughts?

Yes it’s fair considering how much time it takes and what the seal kit and specialty tools will cost; however a suspension specialist will do just as good a job or better and likely be less expensive. Bike shops either have to charge more or basically do the job for cost. Personally I do the job for cost as a favor to customers that I know well and refer everyone else to a suspension specialist. IMO a professionally rebuilt one is better than a new fox one. I originally got interested in rebuilding them because we had so many oem ones show up bad out of the box. If you trust the shop to handle the job (most shops wouldn’t even think about tearing into a rear shock) then it might be worth giving them the business even if it’s more expensive. It always pays to have someone local who has your back and money spent at good bike shops usually pays itself back many times over
flag Skimoab
Posted: Oct 8, 2020 at 17:16 Quote
ZSW wrote:
Schmidty racing also sells schrader valves that can be used to convert the plug/needle system to a schrader valve.

https://www.schmidtyracing.com/Nitrogen-Reservoir-Schrader-Valves-p/n-shr.htm

If you use these, are they just a permanent replacement? So they stay on the shock?
flag ZSW
O+
Posted: Oct 8, 2020 at 21:29 Quote
Skimoab wrote:
ZSW wrote:
Schmidty racing also sells schrader valves that can be used to convert the plug/needle system to a schrader valve.

https://www.schmidtyracing.com/Nitrogen-Reservoir-Schrader-Valves-p/n-shr.htm

If you use these, are they just a permanent replacement? So they stay on the shock?

They stay installed on the shock during use but are not permanent. They thread in so they can be easily removed if you want
flag daguvena
Posted: Nov 20, 2020 at 7:20 Quote
ZSW wrote:
Skimoab wrote:
ZSW wrote:
Schmidty racing also sells schrader valves that can be used to convert the plug/needle system to a schrader valve.

https://www.schmidtyracing.com/Nitrogen-Reservoir-Schrader-Valves-p/n-shr.htm

If you use these, are they just a permanent replacement? So they stay on the shock?

They stay installed on the shock during use but are not permanent. They thread in so they can be easily removed if you want


Does this adapter thread into and replace the pellet retainer (hex/allen) plug?
photo

Seems obvious but it eliminates the rubber pellet and white Delrin ball, right? If so, happen to know the size? I'm thinking 5/16"-24 since the Fox DPX2 instructions suggest the following to remove the End Cap.


018-02-034 Fastener, Standard: Screw [5/16-24 X 1-1/2] Socket Head Cap, Zinc Plated (Optional tool for Reservoir End Cap Removal)

I see the following valve adapters:

1/8" - 27 NPT | Standard Pressure
1/8" - 27 NPT-HP/T | High Pressure/Temperature
1/8" - 27 NPT-SS-UHP/T | Ultra High Pressure/Temperature
1/4" - 18 NPT-HP/T | High Pressure/Temperature
5/16" - 32 ORB-HP/T | High Pressure/Temperature
5/16" - 24 ORB-HP/T | High Pressure/Temperature
7/16" - 20 ORB-HP/T | High Pressure/Temperature
7/16" - 20 ORB-HP/T | Ultra High Pressure/Temperature
King Shocks 1/8" NPT | High Pressure/Temperature | Straight Thread; O-Ring Backed

Thanks!!!
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