14
TROUBLESHOOTING
For disassembly and assembly follow instructions on pages 8 through 13. Always test the Yale LH2 Hoists under
load after reassembly of any parts to be sure it operates properly and holds the load when the hand chain is
released.
PROBLEM
1 Hoist is hard to
operate in either
direction.
2. Hoist is hard to
operate in the
lowering direction.
3. Hoist is hard to
operate in the hoisting
direction.
4) Hoist will not operate
in either direction.
5) Hoist will not operate in
the lowering direction.
6. Hoist will not operate
in the hoisting direction.
7. Hoist will not hold load
in suspension.
CAUSE MAY BE
A) Load chain worn long to gage, thus
binding between liftwheel and chain guide.
B) Load chain rusty, corroded or clogged up
with foreign matter such as cement or
mud.
C) Load chain damaged.
D) Liftwheel clogged with foreign matter or
worn excessively, causing binding between
the liftwheel and chain guide.
E) Hand chain worn long to gage, thus
binding between handwheel and cover.
F) Handwheel clogged with foreign mater or worn.
G) Liftwheel or gear teeth deformed.
A) Brake parts corroded or coated with
foreign matter.
B) Chain binding.
A) Chain binding.
B) Chain twisted. (3 ton capacity or larger).
C) Overload.
A) Liftwheel gear key or friction hub key
missing or sheared.
B) Gears jammed.
A) Locked brake due to a suddenly applied
load, shock load, or load removed by
means other than by operating unit in
the lowering direction.
B) Chain binding.
C) Lower hook all the way out. Load chain
fully extended.
A) Chain binding.
A) Lower hook or load side of chain on
wrong side of liftwheel.
B) Ratchet assembled in reverse.
C) Pawl not engaging with ratchet.
D) Ratchet teeth or pawl worn or broken.
E) Worn brake parts.
F) Oily, dirty or corroded brake friction surfaces.
REMEDY
A) Check gage of chain (see Page 6). Replace
if worn excessively.
B) Clean by tumble polishing or using a non-
acid or non-caustic type solvent. Lubricate
with Lubriplate
®
Bar and Chain Oil 10-R
(Fiske Bros. Refining Co.) or equal lubricant.
C) Check chain for gouges, nicks, bent or
twisted links. Replace if damaged.
D) Clean out pockets. Replace if worn
excessively.
E) Check gage of chain (see Page 6).
F) Clean out pockets. Replace if worn excessively.
G) Excessive overload has been applied.
Replace damaged parts.
A) Disassemble brake and clean thoroughly.
(By wiping with a cloth - not by washing
in a solvent). Replace washers if gummy,
visibly worn or coated with a foreign
matter. Keep washers and brake surfaces
clean and dry.
B) See Items 1A, 1B and 1C.
A) See Items 1A, 1B and 1C.
B) Rereeve chain on 3 and 4 ton unit, if both
chains are twisted, capsize hook block
through loop in chain until twists are
removed. Caution - do not operate unit in
hoisting direction with twisted chain or
serious damage will result.
C) Reduce load or use correct capacity hoist.
A) Install or replace key.
B) Inspect for foreign matter in gear teeth.
A) With hoist under load keep chain taut,
pull sharply on hand chain in the lowering
direction to loosen brake.
B) See Items 1A, 1B and 1C.
C) Chain taut between the liftwheel and loose end
screw. Operate unit in hoisting direction only.
A) See Items 1A, 1B and 1C.
A) Lower hook must be on same side of lifwheel
as upper hook.
B) Ratchet must be assembled as shown in Figure 10.
C) Pawl spring missing or broken. Pawl binding on
pawl stud. Replace spring and clean so pawl
operates freely and engages properly with
ratchet. Do not oil.
D) Replace pawl and/or ratchet.
E) Replace brake parts which are worn.
For more information contact: Sievert Crane and Hoist, (708) 771-1600, [email protected], www.sievertcrane.com
