Komatsu 830E-AC Shop Manual page 824

1. Testing operation of shutters
2. Check hydraulic pressure to
cylinder rod end
3. Check hydraulic pressure to
cylinder head end
4. Check hydraulic pressure
between pressure reducing
valve (3) and solenoid valve
(4)
5. Check hydraulic pressure
between pressure reducing
valve (2) and
reducing valve (3)
6. Pressure reducing valve (3)
is defective
7. Solenoid Valve (4) is defec-
tive
8. Check oil supply pressure to
pressure reducing valve (2)
9. Pressure reducing valve (2)
is defective
10. Hydraulic supply to shutters
is incorrect
M19-6
TABLE II. Troubleshooting
With engine at slow idle, connect a
24 VDC power source to solenoid
valve (5, Figure 19-1)
Install tee fittings (6, Figure 19-3) in
lines (8 & 9). Connect pressure
gauges with a 0-3500 kPa (0-500
psi) range to tee fittings. Discon-
nect wire harness (5) from solenoid
valve. There should be 517 kPa
(75 psi) pressure in hose (9), and
NO pressure in hose (8).
Connect 24 VDC power source to
solenoid valve. There should be
517 kPa (75 psi) pressure in hose
(8), and NO pressure in hose (9).
Install hose with tee fitting between
pressure reducing valve (3) and
valve (4). Connect pressure gauge
with a 0-3500 kPa (0-500 psi)
range to tee fitting.
should be 517 kPa (75 psi).
Install hose with tee fitting between
pressure reducing valve (2) and
pressure pressure reducing valve (3). Con-
nect pressure gauge with a 0-
35000 kPa (0-5000 psi) range to
tee fitting. Pressure should be
10,342 kPa (1,500 psi).
Replace pressure reducing valve
(3).
Replace solenoid valve (4).
Install tee fitting between oil supply
hose (1) and pressure reducing
valve (2). Connect pressure gauge
with a 0-35000 kPa (0-5000 psi)
range to tee fitting.
should be 20,684 - 24,131 kPa
(3000-3500 psi) the same as steer-
ing system standby pressure.
Replace pressure reducing valve
(2).
Perform troubleshooting
dures in appropriate shop manual
to correct truck hydraulic system.
Radiator Shutters
Shutters close - GO TO STEP 11
Shutters stay open - GO TO STEP
2
In Spec - GO TO STEP 3
Out of Spec - GO TO STEP 4
In Spec - GO TO STEP 11
Out of Spec - GO TO STEP 4
If nothing changed as compared to
Step 2 - GO TO STEP 7
In Spec - GO TO STEP 7
Out of Spec - GO TO STEP 5
Pressure
In Spec - GO TO STEP 6
Out of Spec - GO TO STEP 8
GO TO STEP 5
In Spec - GO TO STEP 9
Out of Spec - GO TO STEP 10
Pressure
GO TO STEP 8
proce- GO TO STEP 8
M19003