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CAT EXCAVATOR HYDROULIC ISSUE
- Thread starter cat 302
- Start date
BigWrench55
Senior Member
If you are not sucking the filter dry and once you prime it will run again. I think that you are sucking air between the injection pump and filter.
BigWrench55
Senior Member
No that would be just a leak.
There's either a restriction in the line feeding the injection pump or its sucking in air.
If your filter before the injection pump ( primary filter) is dry and the other is full then you are sucking in air in that line or restricted. If both filters are dry. Then either you are sucking in air on the lines from the from the tank to lift pump, or sucking air after the lift pump to the water separator. Or restricted. It should flow tank, lift pump, water separator, primary filter, injection pump.
Made some progress tonight I thank everyone again. I am new to heavy equipment and hydraulics. I found the bango bolt under the lift pump as well as a rust covered and crap filter I removed it and will tighten bleed everything tommorow.
Seems like a new issue everytime I turn around. I turned the machine off the other day and came back in the morning to start it however nothing. I can hear the solonoid but the starter does not engage. The lights and everthing on the ignition work well just not I turn the key and it is not cranking. I had the complete starter rebuilt last summer.
Machine will probably have a separate starter relay ahead of the solenoid, you may be hearing that. May also have a "Safety relay" which interfaces between the alternator and the starter relay to prevent the operator from engaging the starter when the engine is already running. Or any time it kinda feels like messing with you.
John C.
Senior Member
Cat doesn't use a safety relay. The key switch is set up so that you can only hit start position once. If the engine doesn't start then you have to put the switch to the off position and then try to start the engine again from there.
There is a switch on the hydraulic lockout on the left side console. Make sure the lever is all the way in the cut off position before trying to start the engine.
There is a switch on the hydraulic lockout on the left side console. Make sure the lever is all the way in the cut off position before trying to start the engine.
Now you made me unlazy myself and look it up to be sure, the 9KK were Catabishi, and while they may have the American key switch, they have Mitsubishi wiring, so actually they do have a safety relay in the circuit breaker and relay box along with the starter relay and the glow plug relay. 094-2080: RELAY SAFETY. Not that I'm sure that's the problem, more than likely it's something more simple like the lockout switch or a stuck solenoid.
ok here is an update I replaced all the batteries and fixed up some connections. The machine still continues to just click except a couple times it was not really an attempt. The loud click is coming from one of the relays behind the fuse box you can feel the juice in the wire and the relay or solonoid making loud noise. Could this be the issue?
Refer the attached image for the identification of the components.
Normally when we turn start key to on position that shutdown relay will activate once by the controller and that will energize the shutdown solenoid once as well. So if that relay engaging sound happens only once at the start, it is OK.
I think you have to check the starting circuit again Including hydraulic activation control switch.
Few months earlier I also came across with some electrical issues with our excavator as well. At that time i draw a little diagram to simplyfy things and that includes starting circuit, shutdown circuit,etc.
I think though the picture is not that good it will be useful to you if you follow it carefully.
I think though the picture is not that good it will be useful to you if you follow it carefully.
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Start at either end, maybe jumper the starter solenoid hot to see if the starter engages, then work your way back to the starter relay, etc. both ends of the starter relay circuit could have an issue, either the interlock switch or the ground at the safety relay... And of course it all starts at the key switch which feeds the interlock/neutral switch.