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Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5446
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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My question is similar to one submitted three years ago, ( I

Customer Question

Hi, my question is similar to one submitted three years ago, ( I have a 420E CAT0420EVHLS04291, manual shift, extendahoe with thumb hydraulics, floats/ride control and 4x4. Battery went dead, not sure why. Now thumb and extendahoe don't work. Even when hookup up to a jump vehicle. It also has pilot controls. For the Backhoe. Thanks.
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Dan replied 1 year ago.

Hi Jesse, My name is***** will be glad to help. there is a service bulletin on this issue. First correct your low voltage issue by replacing your battery with a known tested good one with a digital tester with no internal problems, dead cells etc. Clean and tighten all battery to starter connections including all grounds and verify the alternator is charging around 2 volts above battery voltage with the engine running. Once okay and if the problem still exists your controller ( ECU) software needs to be updated and reflashed/reprogrammed by the dealer. If the reflash fails you will need to replace the faulty controller. Let me know

Expert:  Dan replied 1 year ago.

Hi Jesse ,Did you get this resolved?