Manitowoc 999 Service And Maintenance Manual page 247

999 SERVICE/MAINTENANCE MANUAL
Block up limit is opened; Pump is faulty; Rated capacity indicator/limiter (RCL) circuit is open;
Bank 1 changed by 2 (front), or 64 (rear) . . . . . . . . . . . . . . . . . . . . . . Maximum bail limit
Bank numbers increased
by number shown.
No
Does RIN screen (bank 7) read 255?
Yes
Check RIN system for problem.
Repair switch or wiring.
Does diagnostic DRUM 1or 2 screen (bank 1) reach
+100% handle control with handle moved back?
Yes
Repair or replace control handle.
When moving problem handle fully in both
directions, does A1 diagnostic screen (bank 1 and
2) read 38 to 120 in lower or 136 to 215 in raise?
Yes
Repair or replace control handle/wiring.
Does diagnostic DRUM 1or 2 screen (bank 2)
reach +100% pump control with handle moved back?
Yes
Is +2.3 or more volts present at
pump EDC with handle moved
back? (See Test 13.)
Yes
Replace pump EDC
or replace pump.
Manitowoc
Front or rear load drum will not raise load, but will lower load.
POSSIBLE CAUSES
Control handle is faulty; Maximum bail limit is opened; Speed sender is faulty.
Check diagnostic screen D2 (see Diagnostic Display topic in section 3).
When applicable switch is enabled...
Does RIN screen (bank 7) read 0?
No
No
No
No
Consult dealer/
factory.
No
Repair or replace wiring
or consult dealer/factory.
Published 05-16-17, Control # 233-03
Problem 9
CHECKS
Bank number not increased
by number shown.
Check for problem and repair limit
switch operation, wiring, or fuse.
Yes
Disconnect LMI boom cable at boom top. Test cable for
continuity across pins A to C for 12 volts from source.
Yes
Check for problem at fuse F6 or wiring.
Check jib shorting plug for continuity across pins A to C
in boom top junction box.
Yes
Replace shorting plug.
Reconnect LMI cable at boom top junction box.
Does RIN screen (bank 7) change from 0 to 255?
Yes
Check anti-two block switches.
If problem returns and RIN screen (bank 7) changes
back to 0, disconnect all connections to boom top
universal junction box. After 5 minutes reconnect boom
cable. Does RIN screen (bank 7) change from 0 to 255
and remain for 10 minutes? (NOTE: Junction box has a
poly-fuse that is tripped and reset by temperature.)
Yes
Check load cell and
anti-two block switches
for short circuits.
TROUBLESHOOTING
No
No
No
No
Replace junction box.
10
10-11