Cub Cadet 8454 Service Manual download pdf (Page 33)

ENGINE

2-11

D569-W02 May-2003

569W219A

569W218A

2.2 LUBRICATING SYSTEM

(1) Inlet (3) Inner Rotor

(2) Outlet (4) Outer Rotor

(1) Piston (9) Rocker Arm Shaft

(2) Idle Gear (10) Rocker Arm

(3) Oil Pump (11) Push Rod

(4) Relief Valve (12) Tappet

(5) Strainer (13) Oil Pressure Switch

(6) Oil Filter Element (14) Camshaft

(7) Bypass Valve (15) Crankshaft

(8) Oil Pan

A. FLOW OF LUBRICATING OIL

The lubricating oil is forced to each journal through the

oil passages of the cylinder block, cylinder head and

shafts. The oil, splashed by the crankshaft or thrown

off from the bearings, lubricates other engine parts

such as the push rods (11), tappets (12), piston pins

and timing gears.

B. OIL PUMP

The oil pump is a gear type. Whose rotors have tro-

choid lobes. The inner rotor (3) has 4 lobes and the

outer rotor (4) has 5 lobes, and they are eccentrically

engaged to each other. The inner rotor, which is driven

by the crankshaft through the gears, rotates the outer

rotor in the same direction, varying the space between

the lobes.

While the rotors rotate from (A) to (B), the space lead-

ing to the inlet port increases, which causes the oil to

flow through the inlet port. When the rotors rotate to

(C), the port to which the space leads is changed from

inlet to outlet. At (D), the space decreases and oil is

discharged though the outlet port.

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Cub Cadet 8454 Service Manual Page 33