Troubleshooting
Safety, Operation and Maintenance Manual - Aug 2012
6-28
SY115C9/135C/155H Crawler Hydraulic Excavator
6.7.2 Failure codes
The failure code(1) displayed on the monitor
can be used to make failure analysis.
Fig. 6-20
Failure
Code
Symptom
Alarm Trigger Condition
3
Engine oil pressure low
Oil pressure lower than 200 and engine speed higher than
800 for 15s
4
Fuel level low
Fuel level lower than 10% for 10s
5
Coolant temperature high
Coolant temperature higher than 105°C or coolant tempera-
ture over-high pressure switch off
6
Air cleaner plugged
Air cleaner plugging pressure switch off
7
Engine speed low
Engine speed lower than 800 rpm but higher than 400 rpm
for 3s
8
Engine speed high
Engine speed higher than 2500 rpm
10
Hydraulic oil temperature high Hydraulic oil temperature higher than 90°C for 10s
12
Motor working range irregular
Motor feedback voltage lower than 0.25V or higher than 4.75V
for 3s
20
Front pump pressure sensor
abnormal
Front pump pressure collecting volt lower than 0.25V or
higher than 4.75V for 3s
21
Rear pump pressure sensor
abnormal
Rear pump pressure collecting volt lower than 0.25V or high-
er than 4.75V for 3s
22
Bucket-dig pilot pressure sen-
sor abnormal
Bucket-dig pilot pressure collecting volt lower than 0.25V or
higher than 4.75V for 3s
23
Bucket-dump pilot pressure
sensor abnormal
Bucket-dig pilot pressure collecting volt lower than 0.25V or
higher than 4.75V for 3s
24
Arm-in pilot pressure sensor
abnormal
Arm-in pilot pressure collecting volt lower than 0.25 and
higher than 4.75 for 3s
25
Arm-out pilot pressure sensor
abnormal
Arm-out pilot pressure collecting volt lower than 0.25 and
higher than 4.75 for 3s
5
S
C
H
E
F
12
36
h
25
m
2010/07/27
1 5 : 3 2 : 4 8
Sany Hydraulic Excavator
S
Lo
CZ215-1103058
1