Doosan D35S-5 Service Manual page 105

Oil Filter
1. Out packing
2. Seaming cap
3. Bypass element assembly
4. Full-flow element assembly
5. Housing
Oil filter uses a spin-on type paper element, in which
full flow filter and bypass filter are integrated.
Bypass valve is assembled to the bottom of the filter.
If the element is loaded, valve opens so that engine
oil goes to oil main gallery without passing through
the element to prevent engine overload.
D439E Service Manual
Lubrication of Parts
The engine oil routed from the oil filter to oil main
gallery lubricates all engine parts as detailed below
before returning to the oil pan.
1. Main bearing and connecting rod bearing
a. There is an oil passage (1) provided from the oil
main gallery to each main bearing. The oil flows
through the oil hole (2) to lubricate the main
bearing and passes through the oil passage
drilled into the crankshaft to lubricate the
connecting rod bearings.
b. The Oil jet (1), installed at each cylinder oil
main passage, injects engine oil into the piston
(2) to cool the piston. This oil jet has a check
valve which is opened/closed by the specified
oil pressure, it prevents oil flow and oil pressure
from decreasing at low pressure.
103 2. Engine Mechanical System (D439E)