Rev 4.0/8-17
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N4950/N10TAIR: #35105
T
ESTING
S
CHEDULE
Perform these tests when placing the hand cup in service
initially and each time following a repair
or modification. Test all features and functions of the hand cup (see OPERATING FEATURES,
OPERATION and MAINTENANCE). Correct any deficiency and retest before using the hand cup.
Note: See MAINTENANCE topics to follow for additional directions about inspecting and testing
specific hand cup components.
M
AINTENANCE
S
CHEDULE
Unless specified elsewhere in this
INSTRUCTIONS manual, the hand cup does not require
maintenance on a routine basis. Instead, maintenance must be performed whenever a
deficiency is indicated by routine inspections or tests. Any maintenance warranted must be
performed before resuming normal operation of the hand cup.
V
ACUUM
P
AD
M
AINTENANCE
Friction Coefficient
The friction coefficient represents the hand cup's ability to resist load slippage when the load is
oriented in any position except horizontal. If the contact surface of either the load or the
vacuum pad is not clean, dry and in good condition, slippage is more likely to occur.
The Maximum Load Capacity of this hand cup is based on a friction coefficient of 1. However, a
vacuum pad's ability to maintain this friction coefficient is reduced by factors such as
contamination, wear, age and exposure to sunlight, as well as the condition of the load's contact
surface (see INTENDED USE: L
OAD
C
HARACTERISTICS
). A pad that has surface contamination must
be thoroughly cleaned (see Cleaning discussion to follow). Over time, the rubber in a pad may
experience hardening or leaching of chemicals, resulting in stiffness or surface glaze. A pad that
exhibits wear, stiffness or glaze must be replaced.
In addition, every pad should be replaced on a regular basis, preferably after no more than 2
years, to ensure that the friction coefficient is not compromised. If necessary, contact your
dealer or Wood's Powr-Grip for more information.
Pad Inspection
Inspect the vacuum pad for the following deficiencies routinely, as directed in the preceding
I
NSPECTION
and T
ESTING
S
CHEDULES
. Correct any deficiency before using the hand cup.
• Contaminates on the pad face or sealing edges: Soil build-up can prevent a pad from sealing
adequately or reduce the friction coefficient (see discussion preceding). Follow the directions
to clean the pad as necessary (see discussion to follow).
• Filter screen missing from pad face: This screen helps prevent debris from plugging the air
inlet. Replace any missing screen immediately (see REPLACEMENT PARTS LIST).
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