Woods-powr-grip MRTA8HV11DC User Manual download pdf (Page 17)

Rev 10.0/9-13 15 MRTA8-DC: #35076

Note: If a vacuum pad has been lying against a hard object (as during shipping), it may be

slightly distorted. Although initially it may be difficult to apply the pad to a load, this condition

should correct itself with continued use.

Reading the Vacuum Gauge

The vacuum gauge indicates the current vacuum level in the lifter’s vacuum system. The

green

range indicates vacuum levels sufficient for lifting the maximum load weight, whereas the

red

range indicates vacuum levels that are

not

sufficient for lifting the maximum load weight. The

gauge needle should show a sudden surge in vacuum as the vacuum pads seal against the load.

If it takes more than 5 seconds for the vacuum level to reach 5" Hg [-17 kPa], press on any pad

that has not yet sealed.

Vacuum Level on Optimal Surfaces

When the lifter is attached to clean, smooth, nonporous load surfaces, it should be able to

maintain a vacuum level in the green range on the vacuum gauge, except when used at high

elevations (see SPECIFICATIONS: Operating Elevation). If not, make sure the vacuum switch is

adjusted correctly (see MAINTENANCE: VACUUM SWITCH ADJUSTMENT). If the vacuum switch

cannot be adjusted to maintain a vacuum of 16" Hg [-54 kPa], perform the VACUUM TEST (see

MAINTENANCE) to determine whether there is a deficiency in the vacuum generating system.

Vacuum Level on Other Surfaces

When the lifter is attached to contaminated, rough or porous load surfaces, it may not be able to

maintain a vacuum level in the green range on the vacuum gauge, due to leakage in the seal

between the vacuum pads and the load surface.

In the case of contamination, thoroughly

clean the contact surfaces of the load and the vacuum pads (see MAINTENANCE: VACUUM PAD

MAINTENANCE: Cleaning), and reapply the lifter to the load. If the load has rough or porous

surfaces,

the operator must conduct a test to determine whether the lifter is designed

to lift the load

, as follows:

1) Make sure the lifter's vacuum generating system is functioning correctly (see MAINTENANCE:

VACUUM TEST).

2) Apply the vacuum pads to the load as previously directed.

3) After the vacuum pumps stop running, place the power switch in the OFF ( ) position.

4) Raise the load a minimal distance, to assure that it is supported by the lifter.

5) Monitor the vacuum gauge while the load is suspended for 5 minutes:

The lifter must

maintain a minimum vacuum level of 10" Hg [-34 kPa] during this time.

If not, the

load does not possess the characteristics required for using this lifter.

Contaminated loads can also cause the vacuum pumps to run frequently or continuously. Since excessive pumping quickly

reduces battery energy, the operator should clean the load when possible, to minimize pumping.

Certain load materials are too rough or porous to allow the lifter to form a seal which can be maintained for 5 minutes without

power. However, in geographical locations where CE Standards do not apply, it may be possible to use the lifter to lift such loads.

Contact Wood’s Powr-Grip for more information.

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Woods-powr-grip MRTA8HV11DC User Manual Page 17

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