Komatsu 75001, Shop Manual

Page: 957 / 1293

SEN03849-00
40-500
4
WA250, 250PZ-6
500 Troubleshooting of hydraulic and mechanical system (H-mode)
Method of using troubleshooting chart
3. Operate the machine and carry out trouble-
shooting of the items not checked in Step 1.
Operate the machine in the same way as in
Step 1, and if any problem occurs, put a check
against the item. (In Troubleshooting item 5 in
the d ia gr am b elo w, the p rob lem w as re -
enacted.)
4. Find the matching cause in the Cause column.
In the same way as in Step 2), if a problem is
found, the
Q marks on the same line for the
troubleshooting item are the causes. (In Diag-
nosis item 5 in the diagram below the cause is
(b) or (e).)
5. Narrow down the causes.
Of the causes found in Step 2) and Step 4),
there are common items (
Q marks on the line
for each Diagnosis item and in the same
Ca u se c olu mn a s e a ch o th er ) tha t ha ve
causes common with the problem items found
in the troubleshooting in Step 1) and Step 3).
a The items that are not common (items that
do not have
Q marks in the same cause
common as each other) are probably not
the cause, so they can be eliminated. (The
causes for Diagnosis item 2 in the dia-
gram below are (c) or (e), and the causes
in Diagnosis item 5 are (b) or (e), so
Cause (e) is the common cause.)
6. Repeat the operation in Steps 3, 4, and 5 until
the cause is narrowed down to 1 item (1 com-
mon item).
a
If cause items are 2 or more, continue until
number of items becomes minimum.
7. Remedy
After narrowing down the common causes,
take the action given in the remedy line.
Marks and remedies in remedy line
×: Replace
E
: Repair A: Adjust C: Clean