Jet L-100 Series, Operating Instructions And Parts Manual

Page: 14 / 40

14
11.0 Troubleshooting JET
®
Manual Chain Hoists
Symptom Possible Cause Correction
1
Hoist will not move in
either direction. Hand chain wheel is jammed, worn,
or damaged. Inspect and clean hand chain and hand
chain wheel. Replace if worn or damaged.
Hand chain slips over wheel. Check hand chain wheel for damage or
worn cogs. Replace if needed.
Load sheave or load chain is jammed. Inspect and clean. Check for chain link
deformation. Replace elements if needed.
Oil load chain for optimal performance.
Load gear/spur gears jammed due to
obstruction or damage. Inspect, clean, and re-grease gears.
Replace if worn or damaged.
Bearing failure. Contact JET service center for disassembly
and replacement of bearings.
Hoist will not lift load, or
lifts with great difficulty. Load too heavy for hoist. Use a hoist with proper capacity for load.
(models with overload protection
2
):
Slip clutch overload protection has
been triggered due to excess load
capacity.
Disengage overload to reset hoist (see
instruction manual). Only lift loads within
hoist capacity. Inspect hoist elements for
damage after overload has occurred.
Load chain is binding. Inspect and clean load chain, load sheave,
and stripper. Make sure chain is not
twisted. Oil chain for optimal performance.
Replace elements if deformation or other
damage is found.
Load sheave is jammed. Inspect and clean. Replace load sheave if
damaged or excessively worn.
Ratchet disc teeth, pawls or pawl
springs worn or damaged. Inspect elements and replace if needed.
Bearing failure. Contact JET service center for disassembly
and replacement of bearings.
Hoist will not lower load,
or lowers with great
difficulty. Load chain is binding due to
obstruction, damage or wear. Inspect and clean load chain and load
sheave. Keep load chain lightly oiled.
Replace chain if damaged or worn.
Brake/ratchet disc not releasing due
to obstruction or damage. Inspect and clean ratchet and pawl
assemblies.
Load drifts downward
while suspended. Load beyond capacity of hoist. Use properly rated hoist for load.
Ratchet disc teeth, pawls or pawl
springs worn or damaged. Inspect elements and replace if needed.
Brake disc(s) worn or dirty. Inspect brake disc(s) for wear or damage.
Consult thickness tolerances in manual,
replace if needed.
Load chain jumps, or
makes excessive noise. Load chain is dirty or dry. Inspect and clean load chain and load
sheave. Oil chain for optimum performance.
Load chain kinked or twisted. Remove twists in chain.
Load chain is worn or deformed, or
otherwise damaged. Replace chain (use JET-authorized chain
only).
Chain catching in load sheave. Inspect and clean chain and sheave. Check
for chain deformations.
Hook latch not closing. Latch is bent or broken. Replace latch.
Hook is deformed preventing proper
latch operation. Replace hook assembly.
1
Some corrections may need to be performed by a JET authorized service center.
2
Identified by “WO” in model number.