SECTION 3 - CHASSIS & TURNTABLE
3-218
3121160
Table 3-18. Air Compressor Troubleshooting
SYMPTOM
PROBABLE CAUSE
SOLUTION
1. Compressor shuts down with air demand
a. Compressor temperature; switch opening.
b. Plugged oil filter
c. Dirty cooler core
d. Contaminated cooler core
e. Hydraulic pressure & Flow incorrect
a. Low oil level-top up. Restricted cooling air intake- clean-
reposition machine. Fan not operating-check ground-check
fan switch.
b. Replace
c. Clean
d. Remove and clean
e. Adjust and reset
2. Compressor will not build up pressure
a. Air demand too great
b. Air filter plugged
c. Press. switch out of adjustment
d. Defective pressure switch
e. Motor does not speed up
f. Belts slipping
g. Service valve wide open
h. Sol. valve stuck
i. Leak in air pilot line
a. Check for leaks and correct Too much air demand
b. Check and replace
c. Reset
d. Replace
e. Pressure switch Check hydraulic flow
&
pressure
f. Readjust/tighten
g. Close
h. Replace
i. Check for leaks & correct
3. Compressor over pressures
a. Press. Regul. out of adjustment
b. Defective press. switch
c. Leak in air control line
d. Inlet valve stuck
e. Restriction in control line
f. Sol. valve not energized/faulty
g. Faulty gauge
h. Defective safety valve
i. Plugged coalescer
a. Reset
b. Replace
c. Check and correct
d. Free or replace
e. Dirt or ice, clean/free up
f. Check for power/replace
g. Check with shop air/replace
h. Replace
i. Replace
4. Insufficient air delivery
a. Plugged air filter
b. Plugged coalescer
c. Motor speed too low
d. Inlet valve stuck
f. Belts slipping
a. Replace
b. Replace
c. Check hydraulic flow & pressure
d. Free or replace
f. Readjust
Summary of Contents for 740AJ
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Page 116: ...SECTION 3 CHASSIS TURNTABLE 3 64 3121160 Figure 3 44 Swing Hub Prior to SN 0300074383...
Page 203: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 151 Figure 3 77 EFI Component Location...
Page 206: ...SECTION 3 CHASSIS TURNTABLE 3 154 3121160 Figure 3 78 ECM EPM Identification ECM EPM...
Page 224: ...SECTION 3 CHASSIS TURNTABLE 3 172 3121160 Figure 3 83 Deutz EMR 2 Troubleshooting Flow Chart...
Page 228: ...SECTION 3 CHASSIS TURNTABLE 3 176 3121160 Figure 3 87 EMR 2 Engine Plug Pin Identification...
Page 229: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 177 Figure 3 88 EMR 2 Vehicle Plug Pin Identification...
Page 230: ...SECTION 3 CHASSIS TURNTABLE 3 178 3121160 Figure 3 89 EMR2 Fault Codes Sheet 1 of 5...
Page 231: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 179 Figure 3 90 EMR2 Fault Codes Sheet 2 of 5...
Page 232: ...SECTION 3 CHASSIS TURNTABLE 3 180 3121160 Figure 3 91 EMR2 Fault Codes Sheet 3 of 5...
Page 233: ...SECTION 3 CHASSIS TURNTABLE 3121160 3 181 Figure 3 92 EMR2 Fault Codes Sheet 4 of 5...
Page 234: ...SECTION 3 CHASSIS TURNTABLE 3 182 3121160 Figure 3 93 EMR2 Fault Codes Sheet 5 of 5...
Page 303: ...SECTION 4 BOOM PLATFORM 3121160 4 31 Figure 4 20 Rotator Assembly HELAC...
Page 460: ...SECTION 5 BASIC HYDRAULIC INFORMATION AND SCHEMATICS 5 116 3121160 NOTES...
Page 467: ...SECTION 6 JLG CONTROL SYSTEM 3121160 6 7 Figure 6 2 ADE Block Diagram...
Page 534: ...SECTION 6 JLG CONTROL SYSTEM 6 74 3121160 NOTES...
Page 580: ...SECTION 7 BASIC ELECTRICAL INFORMATION SCHEMATICS 7 46 3121160 NOTES...
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