Manitowoc 999 Service And Maintenance Manual

Reference Only
TROUBLESHOOTING 999 SERVICE/MAINTENANCE MANUAL
10-30
Published 05-16-17, Control # 233-03
POSSIBLE CAUSES
Remote controller or switch wiring failure; Solenoid valve failure;
Cylinder failure; Mechanical problem.
Problem 27
Counterweight pins will not extend or retract.
CHECKS
Check for 12 volts at counterweight pins retract switch (pin number WB-30) at
remote controller while enabling switch. See Diagnostic Display topic in section 3.
Does (bank 5) change by 2 when enabling switch?
No Yes
Does D2 screen (bank 5) change by 1 when enabling switch?
Test for voltage to remote controller.
Yes No
No Voltage
Check for 12 volts at fuse F4.
Yes
No
Replace fuse F4.
Repair or replace wiring from
PC to remote controller.
Consult dealer/factor.
Is voltage present at counterweight pins solenoid?
Yes
No
Repair or replace wiring
Is there hydraulic pressure at counterweight cylinder
valve port when switch is enabled?
Yes
No
Replace counterweight valve.
Is hydraulic pressure less than 350 psi?
Yes
No
Check Counterweight pins for binding.
Readjust rear drum charge pressure or replace
charge pump or consult dealer/factory.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English