Manitowoc 999 Service And Maintenance Manual page 256

TROUBLESHOOTING
No voltage through control handle to controller; No voltage out of controller to pump EDC;
Wiring or switch is faulty; Damaged pump or motor; Swing holding brake switch actuated.
Check Diagnostic Screen D2(see Diagnostic Display topic in section 3). Does (bank 7) change
Yes
Does diagnostic display SWING screen (bank 1) approach 100%
handle control when handle is extended in either non-swinging
direction?
Voltage
When moving applicable handle fully in both
directions, does A1 diagnostic screen (bank 3) read
38 to 120 in lower or 136 to 215 in raise?
Yes
Does diagnostic display SWING screen (bank 2) approach 100% pump
control when handle is extended in either non-swinging direction?
Yes
Check wiring connector at pump EDC.
Ok
Connect or repair connector.
Manually stroke swing pump. (See Test
16.) Does platform rotate?
Yes
Use test plug adapter.
(See Test 13.) Is voltage
present at pump EDC?
Yes No
Replace pump EDC.
Repair or replace wiring to
PC or consult dealer/factory.
10-20
Problem 17
No swing operation, engine does not load.
POSSIBLE CAUSES
CHECKS
by 2 when enabling swing holding brake switch on control handle?
No
Repair or replace
control handle/wiring.
No
Consult dealer/factory.
Not Ok
No
Isolate pump. Manually stroke pump. Is
system pressurized?
Yes
Repair or replace motor.
Published 05-16-17, Control # 233-03
999 SERVICE/MAINTENANCE MANUAL
Check swing holding brake switch and
wiring to PC. (See Test 7.)
Ok
No Voltage
Repair or replace
handle/ wiring.
Consult dealer/factory.
Repair or replace swing holding brake
switch and/or wiring to PC.
No
Repair or replace pump.
No
Not Ok