I bought an 873G a few months back and found when I worked the machine hard and then let it idle, I would get a low oil pressure alarm/light. If I would increase the idle a little it would go off and I could go back to work. I decided to try a new psi sensor, now it seems to go on the same way but increasing the rpm's does not make it go out anymore. When I bought the machine the previous owner told me he replaced the turbo. Is it possible that there is a problem related to the turbo changeout that I am overlooking. Is it possible the oil filter is plugging up? Previous owner changed the oil between the time I bought machine and took delivery. I thought that was odd that he would just up and change the oil but now I think he knew it had this problem. Any suggestions or comments would be greatly appreciated. Machine has the oil cooled Duetz 73hp engine, 2002 vintage.
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J-Long
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- Oct 17, 2011
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The first thing I would do if I thought there was an oil pressure problem is gauge it.. see what you're actually dealing with in terms of pressure.
Previous owner changed the oil between the time I bought machine and took delivery. I thought that was odd that he would just up and change the oil but now I think he knew it had this problem.
Yeah, I hate to say it.. But I think you're right. I know with come cars it took less than 5psi to put the light out. When they had bearing wear or other internal issues that caused low oil pressure that low at an idle, they'd substitute thicker oil to bump the pressure up enough to put the light out and sell it. It's a terrible practice, but I've seen it happen. You may be in the same situation here.
Further, if the light does not go out at all, don't run it.. Because you may not have any pressure and, from what I gather the Deutz (I've got one too, I'm just now learning about it.. And the first thing I learned is it's costly!) is expensive enough to rebuild.. Let alone if you trash the shortblock from lack of oil.
If it were me, the next time I started it, it would be to gauge it cold...
My 2 cents.
Good luck!
Previous owner changed the oil between the time I bought machine and took delivery. I thought that was odd that he would just up and change the oil but now I think he knew it had this problem.
Yeah, I hate to say it.. But I think you're right. I know with come cars it took less than 5psi to put the light out. When they had bearing wear or other internal issues that caused low oil pressure that low at an idle, they'd substitute thicker oil to bump the pressure up enough to put the light out and sell it. It's a terrible practice, but I've seen it happen. You may be in the same situation here.
Further, if the light does not go out at all, don't run it.. Because you may not have any pressure and, from what I gather the Deutz (I've got one too, I'm just now learning about it.. And the first thing I learned is it's costly!) is expensive enough to rebuild.. Let alone if you trash the shortblock from lack of oil.
If it were me, the next time I started it, it would be to gauge it cold...
My 2 cents.
Good luck!
Thanks for the reply J-Long. Would you just tee in a guage with the sensor or is there a plug somewhere that you know of?
J-Long
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- Joined
- Oct 17, 2011
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I'd plug it into the sensor port..
I'm at a big disadvantage here, as I just bought my first loader a couple of weeks ago, and have no experience with them in particular.
But the same holds true for all engines.. If you've got psi problems, gauge it first. I've got a light hydraulic set of gauges from Mac that I use for these things.. Set me back about 80 bucks..
But if you don't want to spend that, get a cheap under dash gauge set from Auto Zone for a few dollars.. They come with adapters and it should be accurate enough to show you if a real problem exists.
If you do have a problem, stop immediately and come back and find someone who is familiar with the Deutz diesel.. Perhaps they can point you towards common issues, tools and parts suppliers.
I know they're expensive, and if it's rebuildable, you will only run the price up by trashing the shortblock.
Good luck!
I just put a psi gage on with the sensor port and started the machine. I gave it 1/8 throttle until it warmed up a little as I always do, had 48psi. Went down to idle after it started running good and had 40. Went full throttle and had 60. Idled for 10 min and went full again and had 50. After full throttle for 5 min the psi went down to 40, idle 20. Got it up to operating temp and had 36 full throttle and 16 idle followed by low psi light. speeded up again and light went out. Went from full to idle slowly and psi went down to 16-18 but no light? when I go high speed to low speed slowly I get no light. Go to idle fast and I get a light. Final psi at high speed pretty consistently was 40 and idle 16-18. Anyone know what those numbers suggest? I drained the oil and pulled the filter and plan on cutting it apart tomorrow to see what's in it.
That pressure seems a little low to me. If you call the builder of the engine, they could tell you what it should be.
If its low, it could be worn bearings or a worn oil pump. Some times using a thicker oil can help things.
I would see how it is with new oil filter. I have seen odd things happen with the oil pressure due to a clogged filter. They sell a filter cutting tool. If the pump is worn it could be the actual pump or the pressure regulating section with a lazy spring.
another thing to look for is :, unscrew the threaded nipple which the oil filter screws onto to alot of engines have a ball and spring under that nipple and it maybe sticking , I had that problem on a Kubota that kept shutting down on low oil pressure , and a piece of plastic material that I never did figure out where it came from or what it was had stuck in the spring , I think it was introduced into the engine when filling it with oil with a dirty oil container , also verify that you have the correct oil filter , sometimes oil filters will screw right on and look right but will have anti drain checks or by pass built into them that isn't needed on different engines -----------add some Lucas oil stabilizer to the oil and use Rotella 15W40-------- I presume you have the Duetz engine and on the oil cooled engines when you change the oil , you don't get alll the oil out the engine as some is in the oil cooler and the hoses going to it , so when you do an oil change you are not getting all the old oil out , you may have wear on the bearings and that is where you are loosing oil pressure ---Lucas will stiffen it up ----------- from memeory it seems if the pressure drops below 10-12 psi is where the alarm should go off
I stopped in at Bobcat today and they said to check the oil pressure regulating valve. Came home all ready to do that and realized I need a metric allen socket, the same set I borrowed to a co-worker today. I will keep you guys posted.
Well I took all the oil pressure control valves apart and cleaned them, none were really dirty, in fact the internals of the engine are very clean as I saw it. I put new oil in and a new filter and started up going through the same routine as before. After the machine was warm the pressure was around 40 full throttle and 19 idle. The light didnt come on at all so I hope this is a victory. I still wonder if it's a little low, the heat in the cab (oil heat) never really gets hot, just warm and when I idle there is a noticable change in the amount of heat.
What does the manual say for oil pressure? Was there a spring in the oil pressure control valve? Maybe replace it. Difficult to know if its weaker than new.
The manual says Oil pump pressure setting - 101.5 PSI Min Eng. oil pressure, pil temp. 230 F (110 c) at 900 rpm 20.3 1800 rpm 31.9 2800rpm 43.5 There are actually 3 oil pressure control valves, they all have springs, and like you say it's hard to tell by looking if it's weak or not. I did inquire about the springs and they did not have them locally. I may get a better guage as the one I'm using is of questionable quality. I wonder if there is a place to check the oil pump pressure right after the pump where it would be at it's highest reading. And the fact that they call the first spec oil pump pressure setting makes me wonder if it's adjustable. Unless they are referring to the action of the oil pressure control valves making the oil pump pressure go up to 101.5. I did notice in the manual there is a relief valve on the oil pump. I'm going to pull that and make sure it is clean as well.
