SERVICE UTILITY SYSTEM APU START ACCUMULATOR (Continued)
Read accumulator gauge (4). If indicated
pressure is within maximum and minimum limits
shown in chart below, go to step 12. If pressure
is not within limits or your need is to depressurize
the accumulator, go to step 4.
High pressure air trapped under valve
cap can be a hazard. If cap is not
removed slowly, air can pop it off and
Loosen cap (5) on charging valve (6) one or two
turns. Allow any trapped air to escape.
When depressurizing the accumulator,
high pressure air will be released
from the accumulator charging valve.
Ensure body parts are well clear of
high pressure air or injury will result.
Remove cap (5). To depressurize system
accumulator, go to and complete step 6 and stop.
To service system accumulator, connect chuck
(7) from air source to valve (6) before going to
step 6 and on.
Depressurize accumulator slowly.
Fast depressurization will result in
internal damage to accumulator.
Hold body of valve (6) with wrench. Turn valve
outer nut (9) to left one or two turns to open
Charge accumulator with dry air or nitrogen to
pressure indicated in the following chart. Read
pressure on gauge (4).
Tighten nut (9).