Komatsu PC88MR-10 Shop Manual page 947

Failure mode
All work equipment, and swing and travel system operate slowly or
lack power
Engine speed lowers extremely or engine stalls
Any of work equipment, travel and swing does not work
Unusual noise is heard from around hydraulic pump
Fine control performance or response is poor
Boom speed or power is low
Arm speed or power is low
Bucket speed or power is low
Boom swing speed or power is low
Blade speed or power is low
Work equipment does not move in single operation
Hydraulic drift of work equipment is large
Time lag of work equipment is large
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
In combined operation of work equipment or swing and travel, travel
speed drops largely
Machine does not travel straight
Travel speed is slow
Machine is hard to steer or travel power is low
Travel speed does not change, or travel speed is too slow or fast
One of tracks does not run
PC88MR-10
Component causing failure
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Boom q
Arm q
Bucket q
Blade
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q
Troubleshooting of hydraulic and mechanical system (H-
Control valve
q q
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q
q q
q
q
q
q q
q
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q
q q
q
40 Troubleshooting
mode)
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
40-459
H-1
H-2
H-3
H-4
H-5
H-6
H-7
H-8
H-9
H-10
H-11
H-12
H-13
H-14
H-15
H-16
H-17
H-18
H-19
H-20
H-21
H-22
H-23
H-24