check the cooling fan between the drive & pump motors also check the battery voltage, should not go under 42 volts if it do's e71 error code show in the display the means height low voltage, charge the battery when you work the truck to hard yes it' overheat's let it cool off and then drive it if eveything it ok, if it was the bearing sensor it will not drive at all or lifts and cutt of, calibrate hydraulic levers
regards
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