Wittke FEATHERWEIGHT, Maintenance Manual

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66
Pneumatic System
To avoid affecting control of the packer or other air systems on the vehicle (especially under cold
weather conditions), you must maintain the air system regularly: drain the air tanks (see Figure 6 - 1)
and the air filter assembly (see Figure 6 - 2) at the end of every workday and prior to any maintenance.
Both filters of the air filter assembly must be changed twice a year.
To bleed the air filter assembly , do the following:
1. Lock out and tag out the vehicle (see Locking Out and Tagging Out the Vehicle on page 21).
2.
Using a rag, unscrew the drain screws (see Figure 6 - 2).
This will bleed all the water from the water filter bowl and all the air from the coalescing filter
bowl.
The water filter bowl helps keep residual moisture out of the body air system while the coalescing
filter bowl helps capture particles in the air stream.
3. Once both bowls have been completely drained, screw back the two drain screws.
To change both filters of the air filter assembly , do the following:
1.
Lock out and tag out the vehicle (see Locking Out and Tagging Out the Vehicle on page 21).
2. Shut off the air supply and depressurize the unit before servicing.
3.
Unscrew the retaining collar of one of the bowls.
4. Unscrew the bowl.
N
OTE
: Avoid scratching internal surfaces.
5.
Replace the filter element.
6. Reverse the procedure to reinstall the other components (bowl and retaining collar).
7.
Repeat Steps 3 - 6 for the other filter bowl.
Figure 6 - 2 Air filter assembly
Caution
The operator must wear safety glasses to protect his eyes against dust and suspended
matters. The operator must also stay away from the stream to avoid potential injuries.
Bowl
Retaining collar
Drain screw
Bowl
Retaining collar
Drain screw
Coalescing filter Water filter
Bypass indicator