TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
Overloading
Check to make sure that the load
does not exceed the maximum
load limit
Remove excess weight
Load may not be centered
properly on the forks
Check load capacity chart and
reposition load
Mast roller not rotating. Inspect
tracks for debris, grease, or any
foreign obstruction
Clean mast sections with a
degreaser or brake cleaner and
lubricate with a silicon lubricant
Cable pulley wheel not rotating
If there is any damage to the
pulley wheel, or if the wheel
doesn’t rotate smoothly, change
wheel. If the rope guard shows
any damage, replace it
Inspect cable for damage
If cable is kinked, worn or frayed,
replace cable
Mast roller tracks are clean and
mast roller wheels are not
rotating
If wheels and mounting hardware
are not damaged, clean wheels
and lubricate shoulder bolt. If
the wheels do not rotate freely,
replace roller wheel assembly.
Inspect mast sections for damage Replace damaged mast section
Mast sections will not release or
transfer down
Check the safety brake. The
brake will not release unless the
unit is vertical.
If none of these solutions
seem to fix the problem...
Call Sumner’s
Customer Service Department
281-999-6900, ext. 0
NOTE: Mast sections may rise out of succession when load is near maximum capacity. If this
occurs, the masts will correct themselves during continued use or when the load is removed
from the forks. Movement of the mast sections will not affect the position of the forks. The car-
riage must elevate to the top of the top mast section before any mast sections begin to rise, and
it should lower last.
Masts not rising in succession
19