Speedometer Adapter Failure

HoveringHMMWV

Member
75
58
18
Location
AL
My speedometer quit working, so I tested the cable with an electric drill at two different points. The drive pin/key, part #25, within the adapter was inspected and found to be good. The first test was successful through the cable itself between the adapter and the speedometer. The second test failed when connected to the adapter itself. The adapter part is readily available and one is now on order. But, how common is the adapter as a point of failure?
Thank you in advance,
- HoveringHMMWV

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DREDnot

Active member
575
182
43
Location
Phoenix, AZ
That's the main point of failure in my experience with speedometer cables.

Last one I did the angle adapter seized up and snapped the #25 stub shaft.
I Think that little shaft acts as a "fuse" in the cable drive.

Got a new piece(#25) and opened up the angle drive to clean and re-lube. Good as new.
 

papakb

Well-known member
1,759
286
83
Location
San Jose, Ca
Mine failed 20 tears ago because the adapter had loosened up and that short flex line wasn't running true inside and had rounded off. A trip to the auto parts store for a generic speedo cable that I cut to length fixed it and it hasn't been an issue since.

This is why I advocate spending time under your truck every months just "lookin' around".
 

Mogman

Active member
Steel Soldiers Supporter
416
190
43
Location
Papalote, TX
Replaced mine with a GPS unit, now I know it is accurate no matter what I do as far as tire/transmission goes and no maint.!
 

HoveringHMMWV

Member
75
58
18
Location
AL
A new twist to the story.....
Received the drive pinion (part #1 in the above diagram) from the vendor. I was under the truck disassembling the speedometer cable from the original pinion. When pulling the speedometer cable off of the pinion, the cable tip stayed attached to the pinion. The cable tip is not shown in the diagram, but is the faulty portion (rounded off edges in the pic). This cable tip part (located between parts #1 and #3 in the above diagram) is also readily available from the vendor and will keep me from replacing the speedometer cable itself. A function test using the original pinion and reseating the cable tip proved successful. In order to improve dependability, a new cable tip is now on order. Thank you to the vendor for allowing a return of the uninstalled pinion!
- HoveringHMMWV

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HoveringHMMWV

Member
75
58
18
Location
AL
Speedometer cable tip arrived today. Swapped out the failed one shown in post #6. A quick test flight (taking trash to the dumpster) proved a successful repair. Thanks again to KASCAR for the rapid shipping and for accepting the return.
- HoveringHMMWV
 
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