Wood’s Powr-Grip MRPT89AC - Manual (Page 20)

Rev 30.0/6-13 18 MRPT-AC: #35060
If any deficiency is detected during the inspection, correct it before using the lifter. If necessary,
return the lifter to Wood’s Powr-Grip or an authorized dealer for repair (see LIMITED
WARRANTY).
Infrequent Use
If a lifter is used less than 1 day in a 2-week period, perform the Periodic Inspection each time
before using the lifter .
T
ESTING
S
CHEDULE
Perform these tests when placing the lifter in service initially and each time following a repair or
modification . Correct any deficiency and retest before using the lifter.
Operational Tests
• Perform the V
ACUUM
T
EST
to follow.
• Test all features and functions of the lifter (see OPERATING FEATURES, OPERATION and
MAINTENANCE).
Load Test
Prove that the lifter can lift 100% of its Maximum Load Capacity (see SPECIFICATIONS), using an
actual load or an equivalent simulation.
8 Employ the following method to test with an actual
load:
1) Place a test load with appropriate L
OAD
C
HARACTERISTICS
(see INTENDED USE) on a stable
support. Make sure the load is oriented in the upright position. 9
2) Apply the vacuum pads to the load as previously directed.
3) When the vacuum level registers above 16" Hg [-54 kPa] on the vacuum gauge, turn off or
disconnect the power source (as appropriate).
4) Raise the load a minimal distance, to assure that it is supported by the lifter.
5) Hold the load for 5 minutes. The load must not slip or fall during this time period. If it does,
conduct a V
ACUUM
T
EST
and inspect each vacuum pad as indicated under V
ACUUM
P
AD
M
AINTENANCE
: Inspection (see sections to follow). Correct any deficiency that is found and
retest the lifter.
Note: See MAINTENANCE topics to follow for additional directions about inspecting and testing
specific lifter components.
8
ASME Standard B30.20 requires the lifter to be tested to 125% of its Load Capacity.
9
Flat Lifters are exempt from this requirement.