This 1999 Uni-Loader was running fine through out the morning, it was parked for lunch, then wouldn't start again in the afternoon. The engine cranks fine but no sign of combustion. It wasn't run out of diesel and always had at least 1/2 a tank. Battery seems fine and the engine cranking seems strong. Air intake and filters are clean. No trouble lights on except Alternator (which is normal on start up). Oil is clean and full. Hydraulic oil and coolant, full. I'm not sure where to start diagnosing the problem. Maybe someone could offer a few ideas or pointers? Much appreciated. Thanks.
check the electric fuel solenoid is working. also check fuel lines for crack's or leak's before transfer pump. it could have cracked while it was running and got an air pocket in it when you cut it off. is it smoking when you crank it if not it's probley not getting fuel....PS if it gets air in fuel system you will have to crack inj. lines while cranking to get it to out
Welcome ttabyss. Problem could be electrical. There are a couple of different types of injector pumps fitted to the 1840. Can you describe what yours looks like? Rotary CAV or an in-line Bosch?
Identifying the injector. Hi airman. Thanks for helping. I'm not sure how to identify the injector. Here are a couple of pictures.of what I think might be the injector. Sorry, I'm a bit new to skidsteers. This machine did have some electrical faults in the instrument panel which were recently corrected. It has been running for about 4 hours since then. I've checked both fuses and they are fine.
Hi Clintm. Does the fuel solenoid appear in any of the 4 pictures? I'm not sure where to find it. I will run through the procedure for clearing air from the fuel lines and see if it makes a difference. Thanks.
Quick check for fuel - remove inlet line at fuel filter and crank if you get fuel that means the fuel shut off is open
You have the Emission Control ( EC) version of the 4-390. This uses the "in-line" Bosch pump. Behind the pump, between it & the engine, is the shut off solenoid (#30). It should pull the fuel shut off lever (#37) back during start up, if not, put the ignition ON & attempt to manually pull the shut off lever as far back as you can & see if it "clicks" into place & is held by the solenoid. If it does hold in place - see if it starts. There are 3 wires, 1 has power at start,crank / 1 has power at ign on / last is ground, earth. Likely problem is the solenoid is faulty, & a new one is required. PS - good work on loading the pics :thumbsup
Yup, fuel shut off solenoid - problem identified! I followed your instructions - thanks, they were absolutely perfect! When the engine is switched on, the solenoid does not pull back on its own. Shifting it back by hand all the way and it holds in place magnetically. It has to be held there while cranking, but then the engine starts right away - no problems! The solenoid holds itself once the engine is running and releases when shut off. This is great! So, is it best to repair or just replace? Would it be worth checking the 3 wires with a volt meter to see if it is a wiring problem or a defective solenoid? Cheers!
Yes, you should first check if the wiring is OK. Likely the solenoid is at fault. If so, you will need to replace it. You will need to slide the cab forward to gain access & even though it does not look like it, the solenoid does come out from behind there without removal of the pump. The solenoid part number/s J932529 - original Case number 3932529 - Cummins number 87420952 - New CNH number
Been a few years since I've worked on an 1840, are the solenoid wires typical of pull coil solenoids, black=ground, red=hold, white=pull? If so, what supplies the power to the pull wire?
The Ign switch willie! :tong . . . via a relay under the seat......
Ahh, I see. On Bobcat machines the pull wire relay is controlled by the ECU when you power up ignition, ECU drops power on the pull wire relay after the fuel solenoid is engaged, didn't know just how Case did it. Thanks.
That's the beauty of the Case 1800 series skidsteers. Simple, minimal electrics........ those were the days
Problem solved, all working fine again! Went to check the wiring with a volt meter. Two of the wires register 12 volts in the 'run' position. The 3rd wire registers just under 10 volts in the 'start' position. I expected the voltage to be 12 volts, maybe that's why the fuel solenoid wouldn't pull back. But, when reconnecting the wiring harness, I noticed there was a clip lock for latching the two halves together. It hadn't been locked when I disconnected the cable. After pushing it all the way in and engaging the clip, the engine started right up. Now it is running fine. So, in the end, it was a loose wire harness which just needed to be tightened. It must have vibrated loose enough to disconnect the 'start' pair but not the 'run' pair. I am very grateful for all the help you guys gave, especially your patience, airman. It would have been tough to know where to start without all your help. You guys are the best! Thanks.
Another happy customer!....... Glad to help :drinkup
I have a 1840 doing the same thing, sounded like a simple fix till the move the cab forward thing.
Im in the same boat mitchbob. My cab doesn't just slide forward it comes up and off. Please can someone help a person with mechanical skills but knows nothing about diesel mechanics.
Welcome to HEF @Todd Mcloughlin Could you supply machine make & model please? From what you are describing, you don't have a Case 1840.