TexasDan
Member
Hey everybody,
New member and first time posting here. I recently purchased a used PC78 with ~6k hours on the machine. I wasn't able to test the equipment too much at the dealership (used equipment lot), but the machine appeared to operate well. After the machine was delivered I started to put it to work and noticed it was significantly under-powered. After working the machine for 10-15 minutes it began stalling very easily under almost any load, or sometimes no load at all, with any/all combination of functions (travel, boom, arm, curl, swing, counter-steer, push dirt with blade, etc). The machine is always operated with full RPM.
The machine will immediately crank back up after stalling with no issues, and no error codes are indicated on the computer screen. The machine will put off a little dark smoke when immediately starting but after that it runs smooth (less than 2 seconds). If I wasn't operating the machine I have full confidence that it would run without stalling until the machine ran out of fuel. Also, until the machine bogs down and stalls it sounds like its running smooth. Also, when I'm operating the hydraulics there is no unusual noise coming from the hydraulic pump. When the machine bogs down and stalls it doesnt produce any noticeably colored smoke either.
All the fluid levels on the machine are good, I replaced the fuel filter and hydraulic filter, tried running the machine with the fuel cap off (I read on another post that that could indicate something), and put clean fuel in the machine and treated with dry gas and algae killer, just in case. All had no effect. The fuel-water separator had no water in it, and very little dirt/sediment. I also checked the banjo bolts going to/from the fuel filter, they didn't have any screens or signs of clogging or dirt. My guess is maybe there are some more banjo bolts in the fuel system to look into.
I'm pretty limited when it comes to mechanic skills, I have the basic skills, but if anyone has any ideas on what this could be, where to look, or things to do to test/troubleshoot or eliminate possible causes I'm all ears.
Thanks for reading and any help provided.
-Dan
New member and first time posting here. I recently purchased a used PC78 with ~6k hours on the machine. I wasn't able to test the equipment too much at the dealership (used equipment lot), but the machine appeared to operate well. After the machine was delivered I started to put it to work and noticed it was significantly under-powered. After working the machine for 10-15 minutes it began stalling very easily under almost any load, or sometimes no load at all, with any/all combination of functions (travel, boom, arm, curl, swing, counter-steer, push dirt with blade, etc). The machine is always operated with full RPM.
The machine will immediately crank back up after stalling with no issues, and no error codes are indicated on the computer screen. The machine will put off a little dark smoke when immediately starting but after that it runs smooth (less than 2 seconds). If I wasn't operating the machine I have full confidence that it would run without stalling until the machine ran out of fuel. Also, until the machine bogs down and stalls it sounds like its running smooth. Also, when I'm operating the hydraulics there is no unusual noise coming from the hydraulic pump. When the machine bogs down and stalls it doesnt produce any noticeably colored smoke either.
All the fluid levels on the machine are good, I replaced the fuel filter and hydraulic filter, tried running the machine with the fuel cap off (I read on another post that that could indicate something), and put clean fuel in the machine and treated with dry gas and algae killer, just in case. All had no effect. The fuel-water separator had no water in it, and very little dirt/sediment. I also checked the banjo bolts going to/from the fuel filter, they didn't have any screens or signs of clogging or dirt. My guess is maybe there are some more banjo bolts in the fuel system to look into.
I'm pretty limited when it comes to mechanic skills, I have the basic skills, but if anyone has any ideas on what this could be, where to look, or things to do to test/troubleshoot or eliminate possible causes I'm all ears.
Thanks for reading and any help provided.
-Dan