Wood’s Powr-Grip MRTARC811LDC - Manual (Page 34)

Rev 2.0/7-12 32 MRTA8-DC: #35076RC
maintain a higher vacuum level . 27 Otherwise, the lifter would not maintain sufficient
vacuum to lift the maximum load weight.
Adjustment Procedure
WARNING: Load capacity decreases whenever vacuum switch is adjusted to
maintain lower vacuum level.
1) Using a 1/4" open-end wrench (as provided), turn the adjustment screw
about 1/6th turn at a time (approximately one flat of the screw head).
To maintain a
lower vacuum level, turn the screw clockwise (when viewing
vacuum switch from end with electrical connectors).
To maintain a
higher vacuum level, turn the screw counter-clockwise (when
viewing vacuum switch from end with electrical connectors).
2) Recheck the vacuum switch setting following each 1/6th turn of the
adjustment screw. In order to test the adjustment accurately,
release the vacuum pads completely before reapplying them to a
test surface.
When the vacuum switch is adjusted correctly, the vacuum pump
turns off only after vacuum increases to a level higher than the minimum lifting level; and the
pump turns on again before vacuum decreases to a level lower than the minimum lifting level.
27
In order to observe lifter functions while vacuum is decreasing, it may be necessary to create a controlled leak in the vacuum
system (eg, by breaking the seal between one or more vacuum pads and the test surface).
1 ELECTRICAL CONNECTORS
2 ADJUSTMENT SCREW
3 TO MAINTAIN HIGHER VACUUM
4 TO MAINTAIN LOWER VACUUM