87
As to malfunction reason and repair
manner of the engine, please refer to
the 《YANMAR 403C-11 engine malfunction
estimation and maintenance manual 》.
Only authorized people can disassemble and repair the hydraulic parts, please
consult with manufacturer if mentioned works is necessary.
Lower the work equipment or dozer blade to the ground when servicing them and
release the residual pressure of hydraulic system:
Park the machine on level ground, stop the engine, put the pilot control rod
on open position
and shake the pilot operation handle for several circles.
6. TROUBLE SHOOTING
If malfunction occurs, stop machine immediately, analyze the reason and maintain adjust or
repair the machine as following methods, objects and order.
Malfunctions and solutions
Malfunction Reasons Solutions
Noisy hydraulic pump and
vibratory pipeline
1． Hydraulic malfunction.
2． Air bubble in hydraulic
system.
3． Aging hydraulic oil,
degenerative oil mixed with
moisture, wrong brand and
specification produce
bubble.
4． Low hydraulic oil
temperature and high
viscidity of hydraulic oil.
1． Consult with your
dealer.
2． Check whether air
leakage at oil pump inlet
pipeline.
3． Replace oil.
4． Run engine in low revs
and then warm up the
engine.
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