Harrington Hoists and Cranes MCR Trolley - Manual (Page 22)

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3.8 Filtration
3.8.1
CAUTION
The air entering the trolley inlet must not contain any particulate greater than 5
microns in size. Therefore, the hoist must have a 5 micron filter in its air supply. The filter must be
upstream of the lubricator.
3.8.2
The filter servicing the trolley hoist can also service other hoists and air consuming equipment. In this
case, the air filter must be in sized for the total air consumption of the equipment it is servicing.
3.9 Air Dryer - CAUTION
To prevent corrosion and hoist malfunction, employ an air dryer in the air
supply system to ensure that dry air is supplied to the trolley hoist. If there is moisture in the air supplied to the
trolley hoist, this moisture will cause corrosion on internal hoist and trolley components during periods when the
hoist and trolley are idle leading to hoist and trolley malfunction.
3.10 Piping, Hoses and Fittings
3.10.1
CAUTION
System Configuration - The system should be configured as shown in Figure
3-10 . Since moisture tends to accumulate in compressed air systems, corrosion may result if the
system is not periodically drained.
Arrange for a drain in the air supply piping at the lowest point in the piping, and
Periodically drain the system to remove moisture/water from the system and to prevent corrosion.
Filter, regulator (if equipped), and lubricator must be arranged in the order shown in Figure 3-11 .
Figure 3-10 Diagram of Air Supply Configuration (Typical)