The full-flow oil filter (Fig. 1) is fixed with three bolts on the right side of the lower part of the crankcase through a gasket and consists of a housing 11, caps 17 and two filter elements
The filter elements consist of outer and inner perforated cylinders with end caps.
In the annular space between the cylinders, a paper tape 7 is placed, folded like an accordion to increase the filtering surface.
Two such replaceable elements are mounted on rods 3, with which the caps are attracted to the body 11 through the sealing rings 10.
Each element is centered by bushing 12 and is also pressed against the body by spring 6 through cup 5 and sealing ring 2.
The oil pumped by the pump enters both caps simultaneously and passes under pressure through the pores of the paper tape into the space between the filter element and the rod.
From here, the purified oil enters the oil line through a channel in the housing.
Over time, the pores of the filter elements become clogged and the oil begins to pass into the line uncleaned through the bypass valve 15.
When the valve opens, it presses the mobile contact 14 against the screw 13 of the signaling device and this turns on the lamp on the instrument panel in the cab.
Normally, the lamp lights up immediately after starting the engine. If it continues to burn steadily even after warming up, the filter elements must be replaced.
Emergency pressure sensor 16 turns on a signal lamp on the pressure gauge in the cab when the oil pressure in the line drops below 70 kPa.
The oil pressure in the system is controlled by an electric pressure gauge, which operates from a sensor connected by a tube through a threaded hole A in the housing to the main line.
Replacing filter elements
To change the filter elements of the full-flow oil filter:
- - unscrew the drain plugs on the caps and drain the oil from the filter into a lined dish;
- — unscrew the bolt securing the filter cap and remove the cap together with the element;
- — remove the filter element from the cap;
- - in this order, remove the second cap and filter element;
- —wash the filter caps with diesel fuel;
- - replace filter elements and assemble the filter; check for oil leaks at the filter connections with the engine running.
In case of leakage, tighten the cap bolts. If the leak on the seal of the caps is not eliminated by tightening the bolts, replace the rubber seals;
- — after replacing the filter elements, bring the oil level to normal