Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 10-19
999 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
Problem 16
No swing operation, but engine loads.
POSSIBLE CAUSES
Mechanical hang-up; Solenoid failure; Wiring fault.
CHECKS
Check swing operation in both directions with brake and swing lock released.
Slight swing movement No swing movement
Check swing lock for damage.
No damage
Check for 12 volts DC at swing
brake valve. (See Test 12.)
Damage
Voltage
No Voltage
Repair or replace switch, fuse, or wiring.
Repair or replace wiring.
Check for 12 volts DC to swing lock
solenoid valve. (See Test 12.)
Replace valve.
Check charge pressure at swing lock
with a 0 – 500 psi gauge.
Repair or replace
swing lock.
300 psi or more 300 psi or less
Yes No
Enable manual override on brake valve. (See Test 24.)
Does swing brake release?
Is swing lock or brake release pressure 350 psi or greater?
Check pressure at brake assembly with a
0 – 500 psi gauge. (See Test 22.)
300 psi or more
300 psi or less
Yes
No
No
Replace relief valve or pump.
Set pump charge pressure relief to 350 psi. (See Test 18.)
Is 350 psi obtained?
Repair or replace brake valve.
Voltage No Voltage
Replace valve.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English