Question about Shimano Dura Ace Di2 RD-7970

1 Answer

Hi there, i have been riding with Di2 troublefree for several months. Today, whilst warming up for a time trial both the front and rear mech shifting failed for no apparent reason. Checked battery and it was fully charged ) and for good measure even tried with a fully charged spare). Any ideas or suggestions welcomed

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 1,536 Answers

Note: I haven't seen one of these systems before, but it appears from the technical documentation that the common point is the battery holder; the front and rear derailleurs are not otherwise interconnected. This should narrow the list of things to check.

Inspect the wiring and connectors, especially at the battery unit and the shift switches. Look for corrosion or damaged insulation. Gently pull on each connector to verify it is seated and latched. Where the wiring is subject to repeated movement (especially at the handlebars), flex it and observe whether it bends smoothly. A broken wire inside the insulation will let the insulation turn more sharply at that point. Breaks are most common near where wires are clamped down, so look closely at those points.

If the wiring and connectors look good, inspect the battery contacts for dirt or corrosion. Remove dirt with a soft cloth wrapped around a dowel or pencil eraser. Use a clean pencil eraser to remove tarnish or light corrosion from the battery contacts. If the corrosion is too thick to remove readily with a pencil eraser, cut a strip of Scotch-Brite and fold it across the end of the pencil eraser (make the strip long enough so you can hold it to the sides of the pencil), then use that to clean the contacts.

If you haven't found anything in the preceding work, put the bike on a stand and get a helper to turn the crank and operate the shift buttons while you gently push on the wires going into the battery unit connector. If one of them is broken, you may get intermittent operation. Don't overdo it; you may cause a break!

If you have a multimeter, you can disconnect the wiring and check it for continuity; this is easier and more reliable than push/pull tests, and will not put so much extra wear and tear on the wires. The next step after that would be to connect the battery unit, insert the battery and check for voltage at the shift switch connectors.

Shimano provides an electrical system checker tool specifically for this system, part # SM-EC79. This will not only test the various parts of your system, it will let you reprogram the shifting direction of your shift switches. I don't know how much it costs, but don't be surprised if it has a "sticker shock" price. If you are on good terms with a bicycle dealer who has one you may be able to borrow it.

Posted on May 30, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do i get 3 months free trial on netflix


Netflix Coupon Code December 2016: Free Trial, Promo Codes ...

https://www.dealsplus.com > Coupons > Books, Music & Movies
  1. Cached
  2. Similar
Keep an eye out for their 3 month free trial which is available every few months. Currently, you ... Current Netflix deals offer $7.99 per month subscriptions. More.

Free month - Netflix - Watch TV Shows Online, Watch Movies Online

https://www.netflix.com/getstarted
  1. Cached
  2. Similar
... console, PC, Mac, mobile, tablet and more. Start your free trial today. ... Monthly price after free month ends on 1/27/17. $7.99. $9.99. $11.99. HD available.

Netflix Coupons, Promo Code Discounts 2017 - RetailMeNot

https://www.retailmenot.com/view/netflix.com Save with Netflix coupons and promo codes for January 2017. Today's top Netflix discount: Free First Month When You Join. ... 14% Success • 3 Comments. Showing 3 most recent ... Details: Get 30 day free trial for new customers. Expires on ...

Netflix Coupons December 2016: Coupon & Promo Codes - DontPayFull

www.dontpayfull.com > Entertainment > Online Streaming
  1. Cached
  2. Similar
Netflix Promo code: Free Premium Plan - First Month. Coupon: Free Month Trial. ... Expires: In 3 weeks. All Comments. Saved 15 USD on Enough to get a cheap ...

Up to 50% Off Netflix.com Coupon Codes December 2016

https://www.gvvds.com/store/netflix.com
  1. Cached
The latest Up to 50% Off netflix.com coupon codes for December 2016. ... Free 30 Day Trial at Netflix ... Start your free trial today! ... 6 Months Free Subscription ... (3) Enter the coupon code and click Apply button to see the discount. We're not ...

Netflix Offer Code: Get 3 Month FREE Trial Coupon 2016

promocode4share.com/stores/netflix-promo-codes/
  1. Cached
Use Netflix offer code to get 3 months free trial and great deals on movies, tv shows in 2016. Find the best coupon updated daily at Promocode4share.com.

Dec 29, 2016 | Computers & Internet

1 Answer

Dura Ace di2 front derailleur 10 speed (7970) not shifting correctly. Moving back and forth with clicking sound. How do we fix?


First, is cable tight, it may be that the cable has loosened or stretched. In this case, Put chain on inside spocket, loosen hex head bolt, pull tight, retighten hex head.
It also could be the limit screws have vibrated loose. There are two of them on the top of the derailleur. Make small adjustments in one screw, check to see if it improves shifting or makes it worse. You didn't say whether it was the small or larger spocket. The limit screws control how far in or out the derailleur moves. Read more on Shelton brown .com under derailleur heading

Sep 16, 2014 | Shimano Dura-Ace Di2 7970 Front Derailleur...

1 Answer

I have a 2004 Ford Explorer, and the past 2.Weeks or so it has been.making an awful grinding noise, mostly when I leave work in the morning before it warms up. And when it makes this noise, if I try to...


I have had this on several 01-05 Explorers, and it sounds like the clutch packs are sticking in the rear differential. Once the lube heats up and everything else in there warms up, they will un-stick. Does this noise occur when you make a tight corner at low speeds? If you go around in a tight circle and it makes a horrendous noise in the rear, this is for sure the case. I'm assuming the noise is coming from the rear and not the front. There is no cheap fix for this. They also are known for transmission issues, but that problem generally is high revving and then a hard shift 1-2 and 2-3.

Nov 23, 2012 | Cars & Trucks

2 Answers

1996 chev suburban air condition flow diagram


Give some more details of the problem.

Jul 14, 2011 | 1996 Chevrolet Suburban

2 Answers

Couple of months ago would cut out when but start immediately


hallo
I dont belive it is air that is cousing your problem. Think it is more an electrical isue. I have had some problems with relay module (engine bay, near engine computer). And check fuel lift pump.
hope it helps
Marko

Sep 23, 2009 | 2006 Peugeot 604

1 Answer

Front A/C blows warm, rear is cold


check vacuum hose connections

Sep 11, 2009 | 1999 GMC Suburban

2 Answers

Saab 93 - noisy when going over bumps on the road.


Have you tried driving over a bump whilst also applying the brakes? (Right foot on gas, left gently on brake - with no one behind you!) If the noise goes away, then it could be the brake pads that are not fitted correctly. Only posting this, as this just happened to mine...the mechanic took it over bumps and noise was there. Applied brakes whilst going over bump, noise went away. Replaced badly fitted rear pads (had been bodged by another garage) and the problem was solved.

Apr 23, 2009 | 2004 Saab 9-3

Not finding what you are looking for?
Shimano Dura Ace Di2 RD-7970 Logo

Related Topics:

135 people viewed this question

Ask a Question

Usually answered in minutes!

Top Shimano Cycling Experts

John Egan
John Egan

Level 2 Expert

73 Answers

Eric Hidle

Level 1 Expert

18 Answers

Mike

Level 3 Expert

4336 Answers

Are you a Shimano Cycling Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...