Why won't my Volvo A35C shift in high range?

[Frank Zimmerman]

I'm having a transmission issue with my Volvo A35C articulated dump truck. In low range, it shifts through all the gears

 

[Paul Adrian]

Hi, @Frank Zimmerman, I'd start by checking the transmission fluid level and condition, then inspect the high-range solenoid, wiring, and any fault codes. A pressure test can also help determine if it's a control issue or an internal transmission problem.

 

[WizzyXchange]

If your Volvo A35C won’t shift into high range, I’d start with the simple things before suspecting a major transmission problem. Check the transmission oil level and condition, then inspect the high/low range switch, wiring, connectors, and fuses for any loose or damaged connections.

It’s also worth checking whether there are any active fault codes, because an electrical or transmission-control fault can prevent high range from engaging. If low range works normally but high range doesn’t engage at all, the range-control solenoid or its electrical supply would be one of the areas I’d test.

A pressure test at the transmission/range circuit can help confirm whether the problem is hydraulic or electrical rather than replacing parts by guesswork. Also check whether the machine is actually receiving the command to select high range.

If you can provide the A35C year/serial number, whether reverse/low range work normally, and any fault codes showing, it would be easier to narrow down the likely cause.

 

[hosapik]

If your Volvo A35C won’t shift into high range, I’d start with the simple things before suspecting a major transmission problem. Check the transmission oil level and condition, then inspect the high/low range switch, wiring, connectors, and fuses for any loose or damaged connections.

It’s also worth checking whether there are any active fault codes, because an electrical or transmission-control fault can prevent high range from engaging. If low range works normally but high range doesn’t engage at all, the range-control solenoid or its electrical supply would be one of the areas I’d test.

A pressure test at the transmission/range circuit can help confirm whether the problem is hydraulic or electrical rather than replacing parts by guesswork. Also check whether the machine is actually receiving the command to select high range.

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If your Volvo A35C shifts through all gears in low range but has problems in high range, I’d start by checking the transmission control system, range selector, and related wiring or solenoids. Also, check the transmission oil level and condition, along with any fault codes. Does it refuse to shift into high range completely, or does it engage but slip or lose power? That detail will help narrow down the likely cause.