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CWL-20E
Maintenance and Inspection
12.2
Maintenance instructions
WARNING
- All inspection and maintenance procedures
must be performed after the jack has been removed from
service. Failure to do this may result in personal injury
and/or property damage.
All warning and capacity labels should be readable
and complete. Wash external surfaces of lift, labels,
and decals with a mild soap solution. DO NOT allow
water to get into the Electronics Enclosure or onto any
of the electronics or wiring. Contact the manufacturer
for replacement labels as needed.
Clean and lubricate the surfaces the slide pads slide
upon with good quality lithium grease. Refer to the
“Periodic lubrication” section below.
Inspect battery terminal connections to make sure
they are clean and residue free.
Lubricate the down stop catch pawl and check that it
rotates forward and backward freely. Refer to the
“Periodic lubrication” section below.
Inspect structure for damage to contact surfaces,
excessive wear, damaged or cracked welds and/or
any
abnormal
conditions
that
could
affect
performance of the lifts (See “Structural inspection”
section).
Inspect the String Pot String for kinks, abrasion, or
damage of any kind. Gently wipe off any grease, oil,
or other contaminants from the string. Do not allow
the string to snap back into the string pot.
12.3
Periodic lubrication
If a lift is slower than normal while lifting/lowering, a
chatter/vibration or squeaking sound is present, or a
lift seems to have more resistance than normal, this
typically indicates the need to re-lubricate the lift. In
most environments, this re-lubrication should occur
monthly. If additional assistance is needed, contact
the manufacturer for further instructions.
Lubricate all rotating and sliding portions of the jack
monthly as
shown in Fig. 14.
Fig. 14: Lubrication points
12.4
Valve cleaning and inspection
If the pneumatic valves seem to be sticking open or
closed, or functioning improperly, they should be
inspected and cleaned by following the steps below. The
lift must be off, fully lowered, and disconnected from any
compressed air source during inspection. If any foreign
material is found in a valve or the valve manifold, a filter
should be installed in the air supply line. Contact the
manufacturer for any replacement parts or further
information.
Fig. 15: Valve location component identification
1
Valves
2
Valve manifold
3
Exhaust valve
4
Raise valve
5
Pin insertion valve
6
Down stop disengage valve
7
Down stop engage/pin extraction valve
1.
Inspect the valves’ wires. If there is any damage, bare
wire, or broken or loose connection, repair or replace
the wire.
2.
Remove the suspect valve. They have a wrench flat
for installation and removal. The surrounding valves
may need to be removed to gain access to the
suspect valve. Do not use tools on the plastic cap on
top of the valves.
3.
Inspect the seals for cuts, abrasion, or damage of any
kind. Replace any damaged seals.
4.
Inspect the valve for any damage or foreign material.
Manually shift the valve by pushing the spool from the
bottom to aid in inspection. Clean any foreign material
by brushing it away. Replace with a new valve if any
damage is noticed.
5.
Replace valve being careful not to damage the seals
when inserting into the valve cavity. The valves must
be put back into the cavity from which they came.
Oil downstop
pivot shaft
and release
springs
monthly
Grease swivel
casters monthly
Grease roller wheel monthly.
Grease base post monthly with EP-1 yellow grease.
Oil front wheels
monthly.
