Volvo a25c gearbox problems

[D1ESEL]

Looking for opinions on an A25C gearbox. GKN manufactured gearbox.

Dumper will go into forward and reverse but will not shift up through the gears. Box has had the oil removed, although dirty oil no metallic contamination found. Oil filter cleaned and re-fitted. No difference. However on the over run going down hill it WILL shift up through the gearbox.

Local plant company insists on wanting to fit a reconditioned gearbox they have on the shelf @ £7500 ($11,500).

This gearbox must have been used in different aplications. £7500 seems a lot of money when our 'knackered' gearbox is going to be an exchange unit. What could possibly cost £7500 inside that gearbox!

GKN manufactured gearbox.

A few thoughts of the top of my head: My first thought is there must be a valve body inside the gearbox that controls the clutch packs through solenoid valves and pressure. This I assume can be removed/reconditioned. I know it is not a lot of money to have an automotive valve body reconditioned.

Any ideals welcome!!

 

[cps]

Hi There, there is a part called a potensiometer on the engine that tells the box when to change! sounds as if its out of range! it has a small linkage connecting it to the injector pump,
it has 2 spud type things on the body of it and a lever pointing up wards that has linkage connect to! the lever has to be at 2 oclock when idling and 10 oclock when flatout! (or vice versa not sure)
the fact that you say it changes going down hill is pointing me that way!

Hope that helps

Aiden

 

[billythebairn]

Hi, as aiden says the linkage on the potentiometer ball ends wear allowing it to move out of alignment, this can be adjusted or ball ends replaced as req, check wiring to unit also, if this is no help I would suggest getting a Volvo engineer to check as old 25c had many a wiring fault in harness, this may save you money as the box may be ok.

 

[m4tic]

Check your speed sensors on the transmission for faults

 

[stevenatkinson]

Hey fellas
We have a 1999 A 40 that has lost drive it feels like it is engaging a gear as there is slight movement in the prop to the Dropbox.
It will select reverse but will not come back to neutral.
Any ideas would be greatly appreciated.
Thanks Steve

 

[sfrs4]

just to help a little bit, the part aiden described is pic below, if it works

View attachment A25c load sensor.pdf

it is located directly behind the injection pump

i have also sent you a private message regarding the transmission.

 

[princeAbdul]

My dumper A25c will select gear normal but 'll not move. I 've tried all we could but still not moving.