Sakai SV400D-2, Shop Manual

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9-002
TROUBLESHOOTING
1-2. Important Information for Troubleshooting
Before conducting troubleshooting, it is important to carefully read the operation manual and workshop
manual and understand the electric circuits for each component as well as the structure and function
of each system. Sufficient knowledge of the systems will enable you to identify a possible cause
much faster. A fault or problem may seem to be related to many different factors. To identify the true
cause, some experience is needed. To perform the appropriate troubleshooting, it is important to learn
not only the normal operations of the systems but also the possible symptoms that may occur when
an abnormal condition is present. This chapter explains the possible causes and remedies for likely
incidents taken from past experience.
1-3. Before Starting a Troubleshooting Session
The information in this section is provided to assist the troubleshooter in understanding the systems
and quickly determine the causes when operating abnormalities occur.
The following steps are recommended:
1. If not familiar with the machine, study the Operator’s Manual and this Shop Manual.
2. Check with the operator for full details of the trouble, ask questions.
3. Verify the trouble by warming up the machine and operating it. Check the problem yourself.
4. Identify the problem with either a mechanical, hydraulic or electrical system source.
5. Isolate the problem to a particular component or circuit.
6. Eliminate the simplest or easiest to check possibilities first to prevent unnecessary disassembly of
components.
7. Following repair or replacement of any parts, perform operational tests to verify that the problem
has been eliminated and the performance of all the systems is normal.
1-4. Wire Color Code
B Black BrY
Brown/
Yellow stripe
L Blue LgY
Light green/
Yellow stripe
W White YL
Yellow/
Blue stripe
BR
Black/
Red stripe
G Green LR
Blue/
Red stripe
R Red WB
White/
Black stripe
YR
Yellow/
Red stripe
BW
Black/
White stripe
GB
Green/
Black stripe
LW
Blue/
White stripe
RB
Red/
Black stripe
WL
White/
Blue stripe
YW
Yellow/
White stripe
BY
Black/
Yellow stripe
GL
Green/
Blue stripe
LY
Blue/
Yellow stripe
RG
Red/
Green stripe
WR
White/
Red stripe
Gy Gray
Br Brown GR
Green/
Red stripe
Lg Light green RL
Red/
Blue stripe
WY
White/
Yellow stripe
O Orange
BrB
Brown/
Black stripe
GW
Green/
White stripe
LgB
Light green/
Black stripe
RW
Red/
White stripe
Y Yellow Sb Sky blue
BrR
Brown/
Red stripe
GY
Green/
Yellow stripe
LgR
Light green/
Red stripe
RY
Red/
Yellow stripe
YB
Yellow/
Black stripe
P Pink
BrW
Brown/
White stripe
LgW
Light green/
White stripe
YG
Yellow/
Green stripe