Failure Mode And Cause Table - Komatsu PC200-8M0 Shop Manual

SEN06139-00

Failure mode and cause table

Failure mode
All of work equipment, swing and travel work slow or
lack power
Engine speed lowers extremely or engine stalls
All work equipment, travel, and swing systems do not
work.
Unusual sound is heard from around hydraulic pump
Fine control performance or response is poor
Speed or power of boom is low
Speed or power of arm is low
Speed or power of bucket is low
Work equipment does not move in single operation
Hydraulic drift of work
equipment is large
Time lag of work equipment operation is large
Other wok equipment moves when one of work equip-
ment is relieved
One-touch power maximizing function does not work.
In combined operation of work equipment, equipment
having heavier load moves slower
In combined operations of swing and boom RAISE,
boom rising speed is low
Travel speed drops largely in combined operation of
swing and travel
Machine does not travel straight
Travel speed is low.
Machine is hard to steer or travel power is low
Travel speed does not change or travel speed is too
low or high
One of tracks does not run
Upper structure does not
swing
Swing acceleration is poor
or swing speed is low
Upper structure overruns
considerably when it stops
swinging
Shock is larger when upper structure stops swinging
Large unsual noise is heard when upper structure
stops swinging
Swing drift on a slope is
large
Attachment circuit is not changed
Oil flow in attachment circuit cannot be changed
6
40-500
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Failed parts
q
Boom
Arm
Bucket
Upper structure swings
neither to the right nor left
Upper structure does not
swing in only one direction
Poor or low for both of the
right and left
Poor or low for only in one
direction
Largely for both of the right
and left
Largely for only in one
direction
When swing brake works
When swing brake works
Tank Hydraulic pump
q q q q q q q q q
q q q q q q q
q q q
q q q q
q q q
q
q
q
PC200, 200LC, 220, 220LC-8M0
Failure mode and cause table
Control valve
q q q
q
q
q q q q q q q q q
q q q q q q
q q
q
q
q q
q q
q
q
q
q
q q q q q
q q q
q q q q q q
q
q
q
q q
q
q q
q
q