Crank No Start

Phillip Technician Michigan Posted   Latest  

I have a 1992 950 F Loader that ran fine then the starter went out. We replaced the starter wouldn't turnover, then found the two circuit breakers were corroded out we replaced them. The engine still wouldn't crank, found that the S-wire wasn't hooked up. the tech who installed it wasn't the one who removed it plus it was tucked away and the terminal was missing. Was at the machine with my new guy had him repair the S-wire and put it back on wasn't watching him. I went to crank the engine over he had the S-wire on the wrong side and fried the ground wire from solenoid the the starter housing. Replaced ground wire got engine to turn over but won't fire. Replaced fuel filters tired again could only get it to run with ether. Had my mechanics check for fuel from the pump and got nothing. The pump has a solenoid power to the center pin and showing ground at the two outside pins. Looking for either a wiring diagram or any guidance would be greatly appreciated 

0
Interesting
Rex Technical Support Specialist
Ohio
Rex
   

Try providing direct from battery power and grd to that solenoid. Unhook the wiring that is on it now so nothing can backfeed. Did you headlight (load) test the power and ground circuits at the solenoid. There may be corrosion there. You should hear the solenoid click when you power it on. May need bled if fuel had a chance to drain during filter change. When was the last time it ran? ALWAYS…

0
Ð Awarded
Michael Mechanic
Texas
Michael
 

Good tip… but on the fuel pump solenoid you may not be able to hear it… sometimes with fingers on it, when activated, you may be able to feel it. Is this a rubber tire backhoe?

0
Ð Awarded
Phillip Technician
Michigan
Phillip
 

No it's a 950F loader

0
Ð Awarded
Rex Technical Support Specialist
Ohio
Rex
 

Does have rubber tires. Just not a backhoe machinerytrader​.​com/listings/for-s… I would think the first one would scrap out for more than asking price. Labor cost might be to much.

0
Ð Awarded
Michael Mechanic
Texas
Michael
 

Time they sell it I imagine it's going to fetch closer to the 2nd one's price.

0
Ð Awarded
Rex Technical Support Specialist
Ohio
Rex
 

DUH, I missed it was an ongoing bid. Long week!

0
Ð Awarded
Andrew Owner/Technician
Kansas
Andrew
 

Not much help with the heavy equipment but I did find this wiring diagram online, hope it helps. 950F ELECTRICAL SYSTEMS SCHEMATIC | CAT Machines Electrical Troubleshooting (catsch​.​info)

0
Ð Awarded
Rex Technical Support Specialist
Ohio
Rex
 

Interesting site. Thanks

0
Ð Awarded
Marvin Mechanic
Mississippi
Marvin
 

Can you show photo of pump and solenoid….

0
Ð Awarded
Phillip Technician
Michigan
Phillip
 

I will get a picture of it on Monday I'm out of the shop at the moment

0
Ð Awarded
Phillip Technician
Michigan
Phillip
 

Here are the pictures

0
Ð Awarded
David Mobile Technician
Missouri
David
 

Cat 950F Loader - This solenoid is a magnetically latched solenoid, it has three wires, One is from the Key Switch. One goes to the starter S Terminal, and the third is a dedicated ground circut. The Pink or Purple wire goes to the key switch and is hot when the key switch is off. (kinda weird). The middle wire should be a Blue wire and that goes to the Starter S Terminal. The last wire should…

0
Ð Awarded
Phillip Technician
Michigan
Phillip
 

David I posted pictures in the reply above your comment

0
Ð Awarded
David Mobile Technician
Missouri
David
 

I had service calls all day on Monday. Glad you got it figured out. Some of the loaders have a timer on the shut down side of the key switch, so it wont pull down the batteries overnight if nobody shuts off the master disconnect switch. Again, Glad you found the issue!

0
Ð Awarded
Phillip Technician
Michigan
Phillip Resolution
 

Wiring not hooked up at the starter

0
Resolution Ð Awarded