Figure 2. Oil Catch Muffler
Service the moisture trap and oil catch muffler as described below. Describe any condition that must be
reported to unit maintenance on DA Form 2404.
1. Moisture Trap.
a. Open the drain valve (figure 1, item 5) and observe the amount of liquid draining from the trap.
Drain in accordance with local health regulations and unit SOP. An excessive amount of moisture
(more than 1 Cup) draining from the moisture trap indicates a problem with the primary shutoff
that may require service.
b. Report an excessive amount of moisture draining from the moisture trap to unit maintenance.
Also report any problems with the drain valve such as a bent valve stem or binding of the valve.
2. Oil Catch Muffler.
a. Open the drain valve (figure 2, item 4) and observe the amount of oil draining from the trap. The
muffler will discharge oil as a normal part of its function. The amount will vary depending on how
long the vacuum pump is in operation. Close valve after muffler is drained. Catch oil in an
approved container and dispose of in accordance with local regulations and unit SOP.
b. To replace the oil discharged, remove the oil filler cap (figure 3 item 1) and check the vacuum
pump oil level. Refill to the correct level as indicated on the dipstick (figure 3, item 2).