Owner's Manual for Thern 5PA5 and 5PA10 Ensign Series Portable Davit Cranes
page 15
A115771-0617
g
FASTEN THE CRANE BASE securely to the foundation.
h
REASSEMBLE THE CRANE.
i
TEST CRANE PERFORMANCE by operating the crane with a load not
exceeding the load rating.
• Listen for unusual noises, and look for signs of damage as you operate the
crane.
• Make sure the wire rope winds evenly and tightly onto the drum. If it is
loose or uneven, rewind it before continuing.
• Make sure the load moves smoothly, without hesitation or strain.
• On hand operated models, make sure the winch handle rotates freely in
both directions.
• On power operated models, make sure the winch responds to the control
device. It must rotate as shown on the control labels, and it must turn off
when you release the control.
• Make sure the boom rotates freely when you push the handle, and
remains stationary when you release it.
• Check the brake. Raise the load, then lower it and stop it a few feet off
the ground. If the load continues to coast or creep under normal operating
conditions, the brake may be worn and in need of repair or replacement.
Contact the factory.
Completely correct all problems before continuing. Use the Troubleshooting
Chart to help determine the cause of certain problems. See Table 3.
diameter
correct
incorrect
Figure 11 – Rope Diameter
The wire rope assembly must
be replaced if the diameter mea-
sures less than the minimum
diameter at any point.
wire rope minimum
size diameter
3/16 in
11/64 in (.1719 in)
1/4 in
15/64 in (.2344 in)
5/16 in
19/64 in (.2969 in)
Table 3 – Troubleshooting Chart
problem cause
correction
overheating
• operated too long without rest. .. . .. . .. . .. . .. . allow to cool
• load too heavy .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . lighten load
• poor lubrication.. . .. . .. . .. . .. . .. . .. . .. . .. . .. . inspect and lubricate as necessary
• bearing seized up .. . .. . .. . .. . .. . .. . .. . .. . .. . inspect and replace as necessary
boom bounces up and down
• load too heavy .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . lighten load
• mounting bolts loose .. . .. . .. . .. . .. . .. . .. . .. . tighten mounting bolts to proper torque
• sheave worn or damaged . . .. . .. . .. . .. . .. . .. . inspect and replace as necessary
• foundation loose or unlevel .. . .. . .. . .. . .. . .. . inspect and repair as necessary
• winch gears worn or damaged .. . .. . .. . .. . .. . inspect and repair as necessary
boom does not rotate
• rotation points contaminated or worn .. . .. . .. . inspect and repair as necessary
• flange bearing broken or locked . . .. . .. . .. . .. . inspect and replace as necessary
boom rotates on its own
• foundation loose or unlevel .. . .. . .. . .. . .. . .. . inspect and repair as necessary
• mast bent, distorted, or leaning.. . .. . .. . .. . .. . inspect and repair as necessary
unusual noises
high pitched squeak
• poor lubrication.. . .. . .. . .. . .. . .. . .. . .. . .. . .. . lubricate entire crane properly
grinding noise
• contaminated lubricant at rotation points .. . .. . clean and lubricate rotation points
rattling noise
• loose bolts, set screws or other fasteners . . .. . tighten all bolts and other fasteners
Refer to the Winch Owner’s Manual for possible problems with the winch and brake.
