Bad billy
Active Member
What's the first thing I look for to figure out why my machine won't turn off by key?.It starts fine .
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Hitachi ex75ur won't turn off by key
- Thread starter Bad billy
- Start date
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- Tags
- excavator hitachi 75ur
thepumpguysc
Senior Member
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- Mar 18, 2010
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Go and watch the engine and have someone turn it off..
If it has a controller working the throttle on the injection pump to the shut off position, it may just need to be calibrated..
Or do u shut it off w a pull cable.??
If so, again.. go watch the engine and see what the cable is attached to and adjust..
If it has a controller working the throttle on the injection pump to the shut off position, it may just need to be calibrated..
Or do u shut it off w a pull cable.??
If so, again.. go watch the engine and see what the cable is attached to and adjust..
Bad billy
Active Member
Ok
I will do this when i get back to the machine .
To calibrate is to adjust the cable correct?
truecountry
Senior Member
ok i have not worked on that small of machine but 160 270 and 330 ...that being said does it have the dial for throttle if so its a electric motor on hydraulic pump side on machine that works throttle to injection pu,mp ....they are bad about eating gears up inside ...the gears are rubber and grease gets hard and over time teeth break off maybe just one but its out of time then and engine will not cut off ...only way to se this is take it off open it up and you will see tooth missing ..also if you have to replace it ..its a relearning for new throttle to machine its a toggle switch behind seat near fuse panel that i will try to find relearn about ....also i have seen the knobs for throttle break lil tit off and get out of time so if you turn dial it goes farther oneway then other
seville009
Well-Known Member
The one I used to have would occasionally not shut off with the key. I would just idle down, the stall it out when the key would not work.
Bad billy
Active Member
Bad billy
Active Member
Did what you said above ,there was no movement of any parts or suck
Bad billy
Active Member
Such
Coaldust
Senior Member
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- Cargo Tanks, ULSD, RUG, Methanol, LPG
The alternator could be back feeding the ignition, keeping the fuel pump energized.
You could try disconnecting the field wires ( not the big wire) from the alternator and see if the engine dies, to confirm.
Why does that happen? Really need a wiring diagram to figure it out, but the Japanese machines often have a diode somewhere in the system to prevent that. Such as the infamous Komatsu D11 diode hidden in the RH console.
You could try disconnecting the field wires ( not the big wire) from the alternator and see if the engine dies, to confirm.
Why does that happen? Really need a wiring diagram to figure it out, but the Japanese machines often have a diode somewhere in the system to prevent that. Such as the infamous Komatsu D11 diode hidden in the RH console.