Manitowoc 999 Service And Maintenance Manual page 265

999 SERVICE/MAINTENANCE MANUAL
Diagnostic display screen A1 displays voltage for problem system handle in neutral position?
Yes
Repair or replace system
control handle or wiring.
Manitowoc
Problem 26
System pump will not return to neutral.
POSSIBLE CAUSES
Pump system control handle is faulty or pump EDC is faulty or out of
adjustment; System pump is damaged; Pump is not centered.
CHECKS
With system handle in neutral does diagnostic display screen
FUNCTION display command activity for pump?
Yes
Consult dealer/factory.
Published 05-16-17, Control # 233-03
Does system pump EDC manually
return to neutral? (See Test 13.)
Yes
Adjust pump neutral.
(See Test 20.)
Does system pump EDC manually
return to neutral? (See Test 13.)
No
Replace system pump EDC.
TROUBLESHOOTING
No
No
No
Repair or replace
system pump.
10
10-29