Owner's Manual for Thern Model FVC-1000 Winches
page 13
A8018B-1210
Table 1 – Inspection Checklist
damages
problems
general
fi nish weathered, fl aking, otherwise damaged
winch jerks or hesitates during operation
parts cracked, bent, rusted, worn, otherwise damaged
unusual noises, other signs of malfunction
fasteners
stripped threads, bent, worn, otherwise damaged
loose, not tightened to the proper torque
gears
excessively worn ,cracked, corroded, otherwise damaged
loose or improperly lubricated
brake
brake corroded, cracked, worn, otherwise damaged
brake does not operate properly
drum
anchor hole worn, distorted, otherwise damaged
excessive movement or backlash
wire rope
bent, crushed, otherwise damaged
wire rope loosely or unevenly wound
broken wires, see Figure 4
replace if more than 6 wires in one lay,
number per strand =
or 3 wires in one strand in one lay, are broken
number per lay =
diameter reduced, see Figure 5
replace if diameter is excessively worn
diameter =
end connections
corroded, rusted, worn, otherwise damaged
not securely attached
labels and plates
dirty, illegible, otherwise damaged
loosely attached or missing
comments
authorized signature
date
checked boxes indicate damage or problem in need of repair
Table 2 – Troubleshooting Chart
Contact the factory for detailed instructions on re-sealing the gearbox if you are required to disassemble the
gearbox for any reason. Disassembly of the gearbox before contacting Thern, Inc. voids all warranties.
problem cause
correction
handle turns, drum doesn’t turn
• loose or broken spring pins or shafts
inspect winch and repair as necessary
• loose, stripped or broken gears or keys
inspect gears and repair as necessary
handle turns hard or not at all
• spring pins loose or broken on winch
inspect winch and repair as necessary
• brake band too tight or locked
inspect brake, adjust or repair as necessary
• gears or bearings broken or locked
inspect and repair as necessary
brake does not operate properly
• brake worn or damaged
inspect and replace as necessary
• brake hub damaged or broken
inspect and repair as necessary
excessively worn gears or bearings
• excessive overloading
inspect installation and correct as necessary
• poor lubrication of gears or bearings
inspect and lubricate as necessary
overheating
• operated too long without rest
allow to cool
• poor lubrication
inspect and lubricate as necessary
• bearing seized up
inspect and replace as necessary
unusual noises
high pitched squeak
• poor lubrication
inspect and lubricate as necessary
grinding noise
• contaminated lubrication
drain, clean and lubricate the winch
• dirt in winch gears
inspect and clean as necessary
• broken gears or bearings
inspect and replace as necessary
rattling noise
• loose bolts, set screws or other fasteners
tighten all bolts and other fasteners
Summary of Contents for FVC-1000
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