Engine and Hidraulique problem in 322c

Hello my friends. First sorry for mi English is not the best. Whe have a caterpillar 322c with around 30.000hours and sometimes the machine don´t start engine, the fuel filters are news the sistem of diesel is ok but just dont start working, and the hidraulics are a bit slow, im working in Angola and here theres not easy to find some parts. i wont to find manual of reparing. Where can i find repairing manual? If sameone helps me? Tanks