CM-ET Series 653 - Manual (Page 9)

6
Maintenance (Continued)
CHAIN INSPECTION
First clean chain with a non-caustic/ non-
acid type solvent and make a link by link
inspection for nicks, gouges, twisted
links, weld spatter, corrosion pits,
sitriations (minute parallel lines), cracks
in weld areas, wear and stretching.
Chain with any one of these defects
must be replaced.
Slack the portion of the chain that
normally passes over the liftwheel.
Examine the interlink area for the point
of maximum wear (polishing). Measure
and record the stock diameter at this
point of the link. Then measure stock
diameter in the same area on the link
that does not pass over the liftwheel
(use the link adjacent to the chain stop
for this purpose). Compare these two
measurements. If the stock diameter of the
worn link is 0.010 inches (0.254mm), or more,
less than the stock diameter of the unworn
link, the chain must bereplaced.
Also check chain for stretch using a
vernier caliper as shown in Figure 7.
Select an unused, unstretched section of
chain (usually at the loose end) and
measure and record the length over 11
chain links (pitches). Measure and
record the same length on a worn
section of chain.
If the result (amount of stretch and
wear) is greater than 0.145 inch (3.7
mm), the chain must be replaced.
Use only a “Knife-Edge” caliper to
eliminate possibility of false reading by
not measuring full pitch length.
Note that worn chain can be an
indication of worn hoist components.
For this reason, the hoist’s frame,
stripper, and liftwheel should be
examined for wear and replaced as
necessary when replacing worn chain
(See DISASSEMBLY and ASSEMBLY
below).
Also, the load chain is specially heat
treated and hardened and should never
be repaired.
IMPORTANT:
Do not use replaced chain
for other purposes such as lifting or
pulling. Load chain may break suddenly
without visual deformation. For this
reason, cut replaced chain into short
lengths to prevent use after disposal.
CHAIN LUBRICATION
A small amount of lubricant will greatly
increase the life of load chain. Do not
allow the chain to run dry. Keep it clean
and lubricate at regular intervals with
Lubriplate
® Bar and Chain Oil 10-R (Fiske
Bros. Refining Co.) or equal lubricant.
Normally, weekly lubrication and
cleaning is satisfactory, but under hot
and dirty conditions, it may be necessary
to clean the chain at least once a day
and lubricate it several times between
cleanings.
When lubricating the chain, apply
sufficient lubricant to obtain natural
run-off and full coverage, especially in
the interlink area.
Hoist normally requires no additional
lubrication except when it had been
disassembled for cleaning or repairs.
IMPORTANT: Brake is designed to
operate dry. Do not use any grease or
lubricant on the braking surfaces.
When lubricating parts adjacent to the
brake, do not use an excessive amount
of lubricant which could seep onto the
brake surfaces.
When the hoist is disassembled for
cleaning or repairs, the following
locations should be lubricated with
approximately 1 oz. per hoist of
Molykote BR-2-S (Dow Corning),
Molytex #2 (Texaco) or TopMoly
(Topsall) grease or equal lubricant:
gears, rollers of the liftwheel bearing,
exterior of pinion shaft, surfaces of
frame bushings and surface of gear
cover bushings. Be sure to thoroughly
clean the old grease from these parts
before re-lubricating.
IMPORTANT:
To insure long life and top
performance, be sure to lubricate the
various parts of the hoist using the
lubricants specified above. If desired,
these lubricants can be purchased from
Columbus McKinnon (See Figure 13,
page 8).
DISASSEMBLY AND ASSEMBLY
The parts illustration and list on pages 12
and 13 show the general arrangement
and name of the parts of the Series 653
Lever Hoist. These should be used when
disassembling and re-assembling the
units so that all parts are properly
installed.
DISASSEMBLY
Points of caution to be observed upon
disassembly of the hoist are:
1. Loose rollers are used for the
liftwheel bearing, (refer to parts
list for number required). Care
must be taken so as to not loose
or misplace these rollers since
they may drop from the unit as
the various parts are disassembled.
Figure 6 - Chain Inspection
Wear
in
These
Areas
Weld
Figure 7 - Chain Inspection
Vernier Caliper
Measure 11 Pitches
One
Pitch
Using other than Series 653 supplied load
chain may cause the chain to jam in the hoist
and/or allow the chain to break and the load
to drop.
TO AVOID INJURY:
Due to size requirements and physical
properties, use only Series 653 supplied load
chain in the Series 653 Lever Hoist.
Used motor oils contain known
carcinogenic materials.
TO AVOID INJURY:
Never use used motor oils as a chain lubricant.
Only use Lubriplate
® Bar and Chain Oil 10-R as a
lubricant for the load chain.
Using any grease or lubricant on the
braking surfaces will cause brake slippage
and loss of load control which may result in
injury and/or property damage.
TO AVOID INJURY:
Do not use any grease or lubricant on
braking surfaces. The brake is designed to
operate dry.