Gear Transmission System - YANGDONG SERIES Y85 Operation & Maintenance Manual

There is a thrust flange at the front end of camshaft,and a thrust plate of camshaft is located
at the front end to control the camshaft axial moving.The lube oil is deliv-ered to the camshaft
bushings separately t!lrough the main oil line.Before assembling the front bushing of camshaft,
check whether the oil holes on the bushing and oil passage in the cylinder block communicate
with each other. As the camshaft gear is engaged with the driven gear on the
011
pump.therefore,
before dismantling the camshaft,it is necessary to disassemble the lube oil pump. then draw the
camshaft ut from the front end.
The axis of the tappet deviates from the center line of cam width.During oper -ating,the
tappet rotates so as to provide an even wearing on the bottom surface and the cylindncal surface
of tappet.
VI. Gear Transmission System
The gear transmissio n system consists of the crankshaft timing gear,timing idler,camshaft
timing gear,injection pump
timin~
gear and hydraulic pump gear.
Except the hydraulic pump gear,all the timing gears are all marked with timing signs which,
when assembling,should align wtih each other at the meshing position (the single tooth marked
with a sign is inlaid between the two adjacent marked teeth)in order to ensure the movement
relationship of all moving parts,as shown in Fig.9.
Fig.9 Timing gear meshing signs
5-6