WPG MRPTHD1211LAC, Operating Instructions Manual

Page: 29 / 42

Rev 1.0/2-21 MRPTHD-AC: #35066 27
Perform the following tests before placing the lifter in service initially, following any repair,
when directed in the “I
NSPECTION
S
CHEDULE
” on page 25, or whenever necessary :
Operational Tests
Test all features and functions of the lifter (see “OPERATING FEATURES” and “OPERATION”).
Vacuum Test
1) Clean the face of each vacuum pad (see “Pad Cleaning” on page 30).
2) Use a test load with weight equal to the Maximum Load Capacity, a clean, smooth,
nonporous surface and other appropriate “L
OAD
C
HARACTERISTICS
” (see page 14).
1
3) Attach the lifter to the test load as previously directed.
4)
Take precautions in case
load should fall during test.
After the vacuum level appears in the green range
on the vacuum gauge, raise the load a minimal
distance and place the power switch in the “off”
position (
).
5) Watch the vacuum gauge: The vacuum level should not decrease by more than 4" Hg

[-14 kPa] in 5 minutes.
6)
Never use lifter that has
failed test.
Lower the load after 5 minutes or whenever a
lifter fails the test, and release the load as
previously directed.
7) Qualified service personnel must correct any fault in the vacuum system before the lifter
can be returned to service.
2
1..... The load surface should have either a flat surface or no more curvature than the lifter is designed for (if any).
2..... For more information, search for your lifter’s Model Number at www.wpg.com and select the “Troubleshooting” link on the product page.
INSPECTIONS AND TESTS