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I'm getting an E03 code on my 2009 Komatsu D39PX-21A dozer. The code only comes on after the machine has been running for about 1-3 minutes. It never shows up while the machine is in park, no matter how long it idles. The dozer runs strong, doesn't bog down, and doesn't go into limp mode. Has...

I recently changed the transmission oil on my Caterpillar D9G, and now the machine won't move at all. Before the oil change, it was operating normally. While researching the issue, I found a similar case involving a D9H where the problem was traced to a dirty priority valve and a faulty pressure...

I recently set up my Komatsu PC360-11 for a hydraulic hammer by switching the return line to the auxiliary valve. After connecting a grapple bucket, the attachment works as expected, but the machine is now showing pump relief codes. I'm wondering if the issue is related to hydraulic settings...

My Bobcat 773 lift and tilt hydraulics have suddenly started moving really slow. The machine still operates, but both functions feel weak and sluggish compared to normal. Trying to figure out if this is caused by low hydraulic fluid, clogged filters, weak hydraulic pump pressure, or another...

Our Caterpillar TH350B suddenly lost boom hydraulic function while working in the paddock. The boom will not operate normally, but it works fine when holding the bypass switch on the joystick. A mechanic checked the machine but could not find the fault. Has anyone experienced similar Caterpillar...

I am having an issue with the swing circle on my Caterpillar 14M, and I'm trying to figure out if this is normal wear.

I've been browsing Boom & Bucket pretty regularly lately, and honestly there seem to be some surprisingly good deals popping up if you watch closely. I recently saw a low-hour skid steer listed way below similar machines on Marketplace, and it got me wondering what other people here have managed...

I'm having an overheating issue on my Komatsu PC200-5 with the 6D95 engine. We already checked the engine, adjusted the hydraulic pump load, and even replaced the engine with a spare, but the machine still runs hot. After removing the cylinder head, we found white marks/patterns on all 6 pistons...

I am looking for some help/insight on a John Deere 490E stalling issue I'm dealing with. The machine starts and idles fine, but as soon as I run any hydraulic function all the way to relief, the engine bogs hard and stalls. Here's what I've checked so far: Getting 5V at the pressure and angle...

I'm trying to track down a hydraulic diagram or pump manual (PDF) for a Sumitomo S280F2 and am not having much luck so far. I recently got my hands on one and want to better understand the hydraulic system layout, pump specs, and troubleshooting basics before I start digging into any repairs...

Trying to troubleshoot my Bobcat 334. It was working fine, then suddenly the swing kept going one way, and now I've got no swing in one direction at all. All other functions are strong, no visible leaks. Could this be a swing motor, relief valve, or sticking control valve issue? Just trying to...

I'm still learning my way around electrical troubleshooting and could really use some help on my JLG E300AJ. Everything else works fine, but I've completely lost forward and reverse drive. I'm getting a 7740 code that points to the shunt circuit. I already checked the wiring and continuity, and...