Manitou MLT 629 2003

[Moggytom]

Manitou MLT 629 2003 telehandler.
Currently have transmission oil pressure lamp on and on checking oil level find it is full but there is black oil contamination showing on dip stick.
I only ever use correct transmission oil which is fine and clear so can anyone anyone suggest cause if this contamination and what other symptoms I should look out for that would relate to this problem as I am no machinery expert.
I do notice two things - machine slow to move off from standstill when cold (as if excellerstir not working) and boom slow to extend and retract when moving dung onto dung heap. I don’t know if these are related problems to transmission or separate issues?

 

[Moggytom]

Ps. Have just had all filters and engine oil changed by qualified engineers so all should be ok

 

[kevindb880]

Head to machinery page, you’ll get more help there!

 

[Moggytom]

Head to machinery page, you’ll get more help there!

Thank you