06/10/2025
๐ง Doosan DL420-7 โ Non-Start Issue Resolved
Called out to a Doosan DL420-7 loading shovel with a non-start issue.
First check โ battery voltage โ it was low, so we jump-started it from another machine and tested the alternator output. It was only charging at 20 volts, yet no battery light was showing on the dash.
We also noted an SCR fault code, but with experience comes knowledge โ and our engineers know when not to chase the wrong problem. Keep it simple: check the basics first.
On this machine, the alternator runs via a PWM (pulse width modulation) control, so you canโt just check the D+ terminal for a live feed โ a normal voltmeter wonโt pick it up properly. Luckily, we have the PicoScope, which let us check the waveform.
The signal was perfect โ confirming the issue was 100% the alternator itself.
At 5pm we diagnosed it, by 8pm we had a new alternator collected, and by 7am the next morning the machine was back up and working.
Thatโs what we call efficiency and expert fault finding โ done right the first time.
No โmain dealerโ prices, just quality service, genuine parts, and the experience to get your machines moving fast ๐โ๏ธ
If youโd like to discuss how we can support your business, drop us a message or book a quick Teams call.
We keep your wheels ๐ turning and your downtime to a minimum