Manitowoc 18000 - Page 306

Reference Only
TROUBLESHOOTING 18000 SERIVCE/MAINTENANCE MANUAL
10-28
Published 12-05-17, Control # 035-23
CHECKS
Check for damage to pawl linkage. Check pawl or pawl actuator/cylinder for freedom of movement.
Problem 26
Pawl on boom, luffing jib, or mast hoist is not operating correctly.
POSSIBLE CAUSES
Mechanical hang-up; No hydraulic pressure; No voltage to pawl
solenoid; Bad wiring connection; Actuator/cylinder failure.
No Damage
Drum 1 Brake Enable . . . . . . . . . . . . . . . . Packet 39, Bank 2 changed by 1
Drum 2 Brake Enable . . . . . . . . . . . . . . . . Packet 34, Bank 2 changed by 1
Drum 3 Brake Enable . . . . . . . . . . . . . . . . Packet 33, Bank 1 changed by 128
Drum 4 Brake Enable . . . . . . . . . . . . . . . . Packet 34, Bank 3 changed by 64
Drum 5 Brake Enable . . . . . . . . . . . . . . . . Packet 34, Bank 1 changed by 2
Drum 6 Brake Enable . . . . . . . . . . . . . . . . Packet 39, Bank 2 changed by 8
Drum 4 Pawl Out. . . . . . . . . . . . . . . . . . . . Packet 34, Bank 3 changed by 8
Drum 4 Pawl In . . . . . . . . . . . . . . . . . . . . Packet 34, Bank 3 changed by 4
Drum 5 Pawl Out. . . . . . . . . . . . . . . . . . . . Packet 34, Bank 1 changed by 8
Drum 5 Pawl In . . . . . . . . . . . . . . . . . . . . . Packet 34, Bank 1 changed by 4
Drum 6 Pawl Out. . . . . . . . . . . . . . . . . . . . Packet 39, Bank 2 changed by 32
Drum 6 Pawl In . . . . . . . . . . . . . . . . . . . . . Packet 39, Bank 2 changed by 16
Damage
Repair damage. Test and adjust.
Move brake switch to apply and release positions. See Crane Diagnostics topic in Section
3 to find CAN bus packet numbers. When applicable function was enabled...
Yes No
Check node 1 for
correct brake input.
Is there voltage from controller to applied brake valve?
Yes No
Check wiring. Consult dealer/factory.
When enabling problem pawl (brake) switch, check hydraulic pawl cylinder for 350 psi (24
bar) at valve cylinder ports. (Luffing jib and boom hoist have pawls are electrically enabled.)
Pressure
No Pressure
Check for binding
or faulty cylinder.
Is hydraulic pressure at 350 psi (24 bar) present pawl valve
or shuttle valve manifold?
Yes
No
Repair or replace control valve.
Readjust function charge pressure
relief valve. Does this solve problem?
Contact dealer/factory.
Repair or replace pump.Consult factory.
No