Manitowoc 999 Service And Maintenance Manual

Reference Only
Manitowoc Published 05-16-17, Control # 233-03 10-31
999 SERVICE/MAINTENANCE MANUAL TROUBLESHOOTING
10
CHECKS
Check for damage to pawl linkage. Check for pawl or pawl
actuator/cylinder for freedom of movement.
Problem 28
Pawl on load drum or boom hoist is not operating correctly.
POSSIBLE CAUSES
Mechanical hang-up; No hydraulic pressure; No voltage to pawl solenoid;
Fuse or wiring; Cylinder failure.
No Damage
Move park brake switch to apply and release positions. Check Diagnostic Screen D2
(see Diagnostic Display topic in section 3). When applicable function was enabled...
Front Drum Pawl Enable . . . . . . . . . . . . . . . . . . . . . . . Bank 5 changed by 64
Front Drum Pawl Disable . . . . . . . . . . . . . . . . . . . . . . . Bank 5 changed by 128
Rear Drum Pawl Enable. . . . . . . . . . . . . . . . . . . . . . . . Bank 6 changed by 1
Rear Drum Pawl Disable . . . . . . . . . . . . . . . . . . . . . . . Bank 6 changed by 2
Boom Hoist Pawl Enable . . . . . . . . . . . . . . . . . . . . . . . Bank 7 changed by 1
Boom Hoist Pawl Disable. . . . . . . . . . . . . . . . . . . . . . . Bank 7 changed by 2
Auxiliary Drum Pawl Enable . . . . . . . . . . . . . . . . . . . . . Bank 1 changed by 1
Auxiliary Drum Pawl Disable . . . . . . . . . . . . . . . . . . . . Bank 1 changed by 2
Damage
Repair damage. Test and adjust.
Front Drum, Bank 6 changed by 1; or Rear Drum, Bank 6 changed by 2; or
Boom Hoist, Bank 6 changed by 4; or Auxiliary drum, Bank 6 changed by 16
Yes No
Check and or replace Fuse F4, switch, or wiring.
Move park brake switch to apply and release positions. check Diagnostic Screen D1 (see
Diagnostic Display topic in section 3).When applicable function was enabled...
Yes No
Contact dealer/factory.
Is there voltage from PC to applied brake valve?
Yes No
Check wiring. Consult dealer/factory.
When enabling problem pawl switch,
check pawl cylinder for 350 psi at
valve cylinder ports.
Pressure
No Pressure
Set charge pressure or replace pump.
Is hydraulic pressure present at
both valve cylinder ports or at
other cylinder ports?
Yes
No
Repair or replace
cylinder.
Repair or replace
system component.

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English