used to have same problem on jungheinrich tfg 30/25 fitted with gm marine engine , the fault was when the engine is stopped and restarted it rocks back if engine is started while rocking back will eventually break nose cone off , two fixes were fitted , use keyswitch that has to beturned back to off before restart , lansing use one jung fit as standard now i think , (in tvh book) also fit a timer and relay in the starter solenoid wire set the timer for a couple of seconds , this allows the engine to stop before starter engaged , we made one up from rs parts bracket helps keep motor in place but not essential.