Troubleshooting - JLG 800A Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE

Troubleshooting

Trouble
No generator output at platform AC receptacles.
Low generator output at platform AC recepta-
cles.
High generator output at platform AC recepta-
cles.
Erratic generator output at platform AC recepta-
cles.
3-80
Table 3-10. Troubleshooting
Be sure generator control switch is turned on at platform.
Check and secure electrical connections at platform, generator, and control box.
Be sure all equipment is turned off when starting unit.
Reset circuit breaker CB1.
Check plug PLG3 connection and/or connections at receptacles RC3 and RC5.
Be sure + 12 volts DC input voltage is being supplied to control box.
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if necessary.
Disconnect leads 12 and 13 from brushes, and check continuity across slip rings (nominal reading is 26 ohms).
Replace generator if rotor is open.
Disconnect stator weld leads 1, 2, and 3 from circuit breaker CB1 , and check continuity between leads. Replace
generator if necessary.
Disconnect plug PLG4 and check continuity between exciter leads 5 and 6. Replace generator if necessary.
Check power board PC1 and connections, and replace if necessary.
Check control board PC2 and connections, and replace if necessary.
Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if necessary.
Disconnect leads 12 and 13 from brushes, and check continuity across slip rings nominal reading is 26 ohms).
Replace generator if rotor is open.
Disconnect stator weld leads 1, 2, and 3 from circuit breaker CB1, and check continuity between leads. Replace
generator if necessary.
Disconnect plug PLG4 and check continuity between exciter leads 5 and 6. Replace generator if necessary.
Check power board PC1 and connections, and replace if necessary.
Check control board PC2 and connections, and replace if necessary.
Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if necessary.
Check power board PC1 and connections, and replace if necessary.
Check control board PC2 and connections, and replace if necessary.
Check and secure electrical connections at platform, generator, and control box.
Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes n necessary.
Disconnect leads 12 and 13 from brushes, and check continuity across slip rings nominal reading is 26 ohms).
Replace generator if rotor is open.
Check power board PC1 and connections, and replace if necessary
Check control board PC2 and connections, and replace if necessary
Remedy
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