Doosan D35S-5 Service Manual page 39

Before removing the timing gear case, remove
timing gear case mounting bolt (1) at the supply
pump first.
If the mounting bolt at the supply pump is not
removed, timing gear case will not be removed.
8. Remove the front oil seal slinger (1).
D439E Service Manual
CAUTION
9. Remove the oil pump gear (1).
10. Remove the idler gear A (1).
37 2. Engine Mechanical System (D439E)