TROUBLESHOOTING GUIDE
If you are experiencing any other problems in the start-up or operation of your Gorbel® crane,
please call 1-800-821-0086 and ask for Customer Service.
TRUNNION ROLLER REPLACEMENT
NOTE:
Gorbel® Trunnion Rollers are an overmolded assembly to be replaced as an entire unit.
Follow instructions below:
• Back off hexnuts on spring tensioners to release Trunnion Roller contact against mast face
(reference
diagrams 2A
and
2B
on page 3).
• Main frame and drive assembly should be adequately supported and power to motor
disconnected before proceeding.
• Remove pivot rod and related hardware from spring tension frame.
• Remove drive mounting frame.
• Remove chain from drive sprockets and drive roller.
• Remove cotter pins that retain trunnion roller shafts.
• Remove trunnion rollers from drive mounting frame and replace with new assembly.
• Re-assemble in reverse order as above and check hardware torque specs.
NOTE:
Gorbel® Trunnion Rollers should be lubricated prior to operation.
WARNING
Note:
Only competent personnel familiar with standard fabrication procedures should be
allowed to perform maintenance operations to Gorbel® systems. Power to drive assembly
should be disconnected before performing any maintenance procedures.
11
7/2022
PROBLEM
CHECK
YES
NO
Jib does not
rotate
1. Is AC contactor coil pulling in
when ON is pressed and does it
stay in?
2. Is motor shaft turning? (With
TEFC motors, if fan is blowing,
air motor shaft is turning.)
3. Are reversing starter coils pulling
in when “CW” or “CCW” buttons
are pressed?
4. Are the drive rollers turning?
5. Call factory and ask for Customer
Service.
See No. 3
See No. 4
See No. 2
See No. 5
Check fuses in jib panel. Check
Pendant wiring. Check control
transformer fuse.
Check that motor leads are secure.
Check thermal overloads on
reversing starter.
Check pendant wiring.
Readjust rollers for correct contact.
Jib rotates in
one direction
only
1. Are reversing starter coils pulling
in when “CW” or “CCW” buttons
are pressed?
2. Call factory and ask for Customer
Service.
See No. 2
Check pendant wiring.
