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Old 09-28-2015, 01:02 PM   #1
MattFX4
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Default battery cable install

What do most of you guys do when tightening your terminal nuts? Do you use a torque wrench, or just tighten with a socket wrench and snug them down? I snugged mine up pretty good with a regular socket and now concerned I may have over-tightened. Going to loosen them all and just barely snug them up enough so cable wont move.
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Old 09-28-2015, 01:24 PM   #2
tlove007
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Default Re: battery cable install

I think Trojan recommends 110 ft pounds. That's pretty tight, but not so that you might rip the post out of the battery. I usussally torque one of them to 110 and kind of get a feel for how tight that is. I usually guestimate the others. Your theory of tightening until the cable won't wiggle is a good measure. I would re-check them after using the cart and see if they need re-tightening.
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Old 09-28-2015, 01:26 PM   #3
vagabond
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Default Re: battery cable install

110 inch lbs I believe is the proper torque
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Old 09-28-2015, 01:32 PM   #4
scottyb
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Default Re: battery cable install

Quote:
Originally Posted by tlove007 View Post
I think Trojan recommends 110 ft pounds. That's pretty tight, but not so that you might rip the post out of the battery. I usussally torque one of them to 110 and kind of get a feel for how tight that is. I usually guestimate the others. Your theory of tightening until the cable won't wiggle is a good measure. I would re-check them after using the cart and see if they need re-tightening.
you mean 110 INCH pounds = 9.16 ft pounds or wrist tight without trying real hard or getting your arm into it... to give an example a faucet handle should not require more than 5 ft pounds to operate.
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Old 09-28-2015, 03:54 PM   #5
JohnnieB
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Default Re: battery cable install

Attached are the battery terminal type list and the battery terminal tightening specs from a Trojan user guide.

Golf cart batteries typically have one of the terminal types circled in red, so the recommended torque is 95 to 105 Inch Pounds, which translates to 7.9 to 8.8 Foot Pounds.

FWIW: I use either a 1/4" drive with a screwdriver handle or a 1/4" ratchet with a two inch, rubber coated handle.
Attached Images
File Type: jpg Battery Terminal Types - Trojan.jpg (96.1 KB, 0 views)
File Type: jpg Battery Torque Specs - Circled.jpg (117.9 KB, 0 views)

Last edited by JohnnieB; 09-28-2015 at 03:59 PM.. Reason: Added comment
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Old 09-28-2015, 04:27 PM   #6
scottyb
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Default Re: battery cable install

Know some of you guys tighten solenoid lugs to 110 ft pounds. I've gotten the returns
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Old 09-28-2015, 06:40 PM   #7
DaveTM
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Default Re: battery cable install

I usually cut off my right arm.....then have it sent into Starrett Precision Tools for calibration. Starrett will replace my forearm bone, calibrate and tighten my muscle, and fine tune my sinew to make ultra adjustments within fractions of an inch\lbs of what is correct. Yes, it's costly and there is blood loss involved, but hey.....that's what the Red Cross is for. Right?
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Old 09-29-2015, 07:48 AM   #8
JohnnieB
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Default Re: battery cable install

I can't stand the sight of blood, especially my own, so having my arm calibrated isn't a viable option for me.

Instead, I use the laws of physics and a bit of common sense.

A wrench is a lever arm, so the length of the wrench is effectively its gear ratio.

If the wrench is 12 inches long, it has a gear ratio of 1:1 and when I applied ten pounds of force to the far end of it, the nut I'm tightening has 10 ft/lb of torque applied to it, but if the wrench was only six inches long, its gear ratio is 2:1 and a 10 pound of force on the far end only applies 5 ft/lb of torque to the nut.

The 2" ratchet I use has a gear ratio of 6:1, so I have to apply 60 pound of force to apply 10 ft/lb of torque to the nut being tightened.

The screwdriver handle I use has a diameter of about 1", so the lever arm is about 0.5" long and the gear ratio is 24:1, so I have to apply 240 pounds of force to apply 10 ft/lb of torque to the but being tightened.

In a nutshell, the shorter the wrench, the more force it takes to apply the same torque to a nut, so when tightening the nuts on batteries, use a short wrench.
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Old 09-29-2015, 08:08 AM   #9
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Default Re: battery cable install

Quote:
Originally Posted by scottyb View Post
Know some of you guys tighten solenoid lugs to 110 ft pounds. I've gotten the returns
Thanks for this mornings "having coffee and surfing the net" laugh. That was really good.
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Old 09-29-2015, 09:57 AM   #10
teecro
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Default Re: battery cable install

Quote:
Originally Posted by JohnnieB View Post
... In a nutshell, the shorter the wrench, the more force it takes to apply the same torque to a nut, so when tightening the nuts on batteries, use a short wrench.
And with a short wrench the less likely you are to short it out across the terminals too...
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