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2005 Volvo A25D Transmission Issues

ms0115

Senior Member
Joined
Mar 3, 2014
Messages
336
Location
Ethridge, TN
2005 Volvo A25D
Serial # - A25DV13985

Transmission fluid is full. Looks good and does not smell burnt. When the truck is cool it will shift fine for 1 or 2 loads. Then when starting off under a load the motor will rev up like the transmission is slipping and it will not pull. Occasionally you can pull it into first gear and it will pull off and you can shift it through the gears. But then it will go back to sounding like it is slipping again. The operator states an alarm went off, a light came on and a he believes it indicated low fluid level according to a picture in the operator's manual. I have not seen the light yet. Any ideas on how to proceed?
 

funwithfuel

Senior Member
Joined
Mar 7, 2017
Messages
5,519
Location
Will county Illinois
Occupation
Mechanic
Monitor vehicle speed and engine speed on display, sounds like you may be losing the vehicle speed in the dropbox.
BTW the dropbox symbol is sometimes confused with trans oil level.
 

ms0115

Senior Member
Joined
Mar 3, 2014
Messages
336
Location
Ethridge, TN
If I am loosing the vehicle speed in the dropbox, what is the fix? Or what should I be looking for? Thanks.
 

ms0115

Senior Member
Joined
Mar 3, 2014
Messages
336
Location
Ethridge, TN
The speedometer seems to read correctly and does not fluctuate. While driving, it will jump out of gear, the motor will rev up, then it will go back into gear firmly and shift thru the gears. When it starts jumping in and out of gear you can come to a complete stop. Pull forward a little and feel the transmission re engage. One time the transmission main oil pressure low symbol came on for about 5 seconds.
 

funwithfuel

Senior Member
Joined
Mar 7, 2017
Messages
5,519
Location
Will county Illinois
Occupation
Mechanic
I would say it's time to drop the Filters and change the oil to see what you have cut the filters apart carefully inspect for debris. Keep in mind there should also be a Sump strainer in the bottom of your oil Pan you may want to remove the Pan to access the sump screen Make sure you don't have any heavy clutch material or metal in the bottom of your Pan as well
 

funwithfuel

Senior Member
Joined
Mar 7, 2017
Messages
5,519
Location
Will county Illinois
Occupation
Mechanic
Use a proper filter cutter to disassemble your oil filter similar to the one shown in the image
 

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walkerv

Senior Member
Joined
Jan 21, 2016
Messages
1,125
Location
wingate nc
Did you drop the Pan and look inside
Im not familiar with anything but the a40 series transmissions , the a40d i took care of had 12600 ish hours on it did some similiar things as it began to fail. Does the a25/a30 tranny have the same life expectancy as the a40d of 10k to 13k hrs . Im curious as to how many hours are on the op tranny
 

ms0115

Senior Member
Joined
Mar 3, 2014
Messages
336
Location
Ethridge, TN
9,000 hours on the machine currently. I did not drop the pan because it is in the the field and I will have it in the shop before I do any more disassembly. I did order a new diagnostic kit that will enable me to do the proper diagnostic work on this Volvo.
 

sfrs4

Senior Member
Joined
Jul 22, 2013
Messages
683
Location
Great Britian
Occupation
parts admin
Defo not the drop box as that is mechanical and you would hear any issue in there. there is a small chance the main pressure pwm valve is acting up and not giving you pressure when you need it, have you monitored the pressures as it happens? visually with a pressure gauge? oil pump be giving up and causing momentary losses of pressure or even the torque converter.
 
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