Volvo A25C will not shift into gear

HeavyMachines · Feb 19, 2021

What would be the first things to check out?

It does not want to shift into gear no matter the throttle input. Oil pressures are fine and inside the specifications.
If anybody has a workshop manual and could find relevant pages, that would be of great help.

Any advice is appreciated.

ETMF 58 White · Feb 26, 2021

Be certain that the battery is fully charged and the alternator is working. Electric shift on these machines.

Dave Neubert · Feb 27, 2021

Just had one do this make sure battery charging system is good check to see if you got power to the shifter make sure oil level is good if all that checks out check trans main pressure the one I worked on had a bad shifter but be ready to pay through the nose $1900.00

HeavyMachines · Feb 28, 2021

Thank you all for these suggestions. I will update as the situation develops.

HeavyMachines · Mar 1, 2021

Alright, all pressures are fine and battery and alternator are fine too. Now the machine is able to shift into first gear and into reverse gear, but fails to do so into higher gears. This, I assume, would rule out the gear selector being bad.

It is possible that the transmission is broke altogether, but I would rather rule out 'cheaper' problems first .

Nige · Mar 1, 2021

Often a transmission that will not shift other than 1st speed forward can be a speed sensor issue. Because if the control can’t detect the ground speed then it can’t give an instruction to upshift. I don’t know how the Volvo transmission gets its shift commands but I suspect it’s the same.

Zwelimw · Mar 3, 2021

Check your speed sensor and engine speed sensor of you getting any accurate readings

sfrs4 · Mar 8, 2021

check both input and output speeds on the transmission, if it "see's" a difference it won't shift up as it thinks there is slip happening

Oros · Jan 5, 2022

sfrs4 said:
check both input and output speeds on the transmission, if it "see's" a difference it won't shift up as it thinks there is slip happening

I got a25c only shift 1 fwd no output speed sensor test ok wiring test ok

sfrs4 · Jan 6, 2022

are you saying you have no output speed sensor? then that is your problem, you need the transmission ECU to see no - small difference between the input and output speed senors otherwise the ecu will limit shifts because it thinks you have a slipping transmission

Volvo A25C will not shift into gear

HeavyMachines

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ETMF 58 White

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Dave Neubert

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HeavyMachines

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