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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JCB Starter Solenoid

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Rob Buckley

01-29-2007 14:32:03

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The starter motor on me Perkins 4.236 powered JCB 3CX is giving me jip...

Anyway, after sitting for a few months while I fixed the radiator, fired the old girl up (with the aid of a jump start) and it ran fine. Stopped, replaced the fuel filter and (jump) started again (battery not too hot & bleeding it all through took a few goes!).

Ran it for a while to give the battery a good charge up, all's well with the world. Just be sure, thought I'd turn off and make sure it started again, before calling it a day.

Turned the key, to be serenaded with an electrical 'bzzzt' noise...then nothing! Tested with a meter, the wire from the ignition switch to the starter solenoid was getting 12v when the key was turned, and 12v at the main solenoid terminal...but no starting action.

Fast forward to yesterday, armed with a new solenoid I set out to get the machine going again.

Fitted the new solenoid, connected it all up, and it (jump) started fine. To see how the battery was charging, I stuck a meter on the battery...voltage 12.44 volts. Same at the alternator terminals. Hmmm.....

So, i turned off to See what happened next...and you guessed it, on turning the starter the same old 'bzzzt' and then nothing!!

Tested with meter, still getting 12v at ignition switch solenoid wire. 12v at the 'input' terminal on the solenoid....when key moved to start, that drops to 0v, and all the time the start switch terminal on the solenoid is earth. question is...what's going on???

I'm guessing the alternator is knackered, with a low battery & a voltage of 12.44v, doesn't seem to be charging.

But why would it keep blowing starter solenoids? Is the starter kernackered too, or could a bad alternator be taking out the starter solenoid after a few mins of running?

It seems to start fine with a new solenoid, but could get a bit expensive for every start!!

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04-26-2007 14:47:00

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 Re: JCB Starter Solenoid in reply to Rob Buckley, 01-29-2007 14:32:03  
hi all,
Saw this tread going here, I have a JCB with simlar starting problem, Batt seems to be ok, I just switched off the machine and hopped back on it an it wouldnt start. on the batt . lights are working fine.

when I tried to crack it, I turn the hey to the on light on position, then the, move it to the heat position, and the red light on the dash dies.

With the torque selector in forward the light stays on when I try and crack, thus proving the torque selector switch is working ..... i think!!!.

I'm wondering where the relays are located ? are they inside in the dash or where ?? I wilh have to do a bit of tracing, is there any easy way of getting the dash off ??

or am I going too far too quick ???

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01-30-2007 07:07:18

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 Re: JCB Starter Solenoid in reply to Rob Buckley, 01-29-2007 14:32:03  
Your JCB should have a volt meter fitted and that should read over 14Vs after start up,the alternator needs to be excited to set it charging so check to see that the red light in the dash shows when you turn the key on,if not check the bulb,if thats ok pull the plug off the back of the alternator and ground the wire that goes on the small terminal,with the key on the red battery light should be lit,if it is then there is a problem in the alternator,your starting problem sounds to me like your battery is no good as you state each time you started it you were using jumper cables,make sure the battery is good and as in the other man"s reply that all the connections are good,all JCB have an intermittance switch on the starter circuit,make sure the connections are good on the switch.
Good luck AJ

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01-29-2007 14:49:29

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 Re: JCB Starter Solenoid in reply to Rob Buckley, 01-29-2007 14:32:03  
It may not be your solinoid but rather the negitive battery cable or where it attaches to the frame. I have had a few JCB do that in this area. It may look fine but you have to take it off and check and clean it real good. Usaualy does the trick.

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