6: Maintenance E900H User Manual
02250203-986 R03
48 Subject to EAR, ECCN EAR99 and related export control restrictions.
2. Remove the fluid return line from the fitting in
the cover.
3. Remove the cover capscrews and lockwash-
ers and lift the cover from the receiver tank
with the minimum pressure/check valve in
place.
4. Remove the separator element.
5. Scrape the old gasket material from the
cover and the flange on the receiver tank. Be
sure to keep all scrapings from falling inside
the tank.
6. Install the separator element.
7. Make sure grounding staples are attached to
separator gasket. Do not remove staples.
8. Replace the receiver tank cover. Install the
eight (8) capscrews and lockwashers in fin-
ger-tight, then gradually tighten in a criss-
cross pattern in 4 to 5 steps. Always tighten
the capscrews alternately at opposite sides
of the cover. Never tighten capscrews adja-
cent to each other. Torque capscrews to
206 ft.lbs (280 N·m).
9. Reconnect all piping. The fluid return line
should extend to the bottom of the separator
element or no more than 1/16 in (1.6 mm) up
from the bottom. This will assure the proper
fluid return flow.
10. Clean the fluid return line strainer and clear
the orifice prior to restarting the compressor.
6.10 Pressure relief valve
An inoperable relief valve may not open properly to pro-
tect the compressor from overpressure. A relief valve
u
nable to close can lead to a large loss of fluid. The func-
tion of the pressure relief valve should be checked on a
week
ly basis.
6.11 Hose maintenance
Inspect and replace inlet, lubrication and control line
hoses every 600 hours or six months. Replace if any
damage or is present.
6.12 Motor maintenance
• The motor should be inspected periodically for
unusual noise or vibrations. This can be a sign
of bearing damage or failure.
• The motor surface should be kept dry and
clean for most efficient cooling. The fan inlet
should be kept free from obstructions.
• Bearings shall be lubricated every 2000 hours
of operation with 45g UNIREX N2. If bearing
overheating or grease degradation is found, the
grease should be changed immediately.
• The motor heater should be operated in
extremely damp environments or during long
periods of storage. Refer to Section 5.5: Main
motor heater for details.
6.13 Control system adjustment
Prior to adjusting the control system it is necessary to
determine the desired operating pressure range as well
as the maximum operating pressure. The maximum
operating pressure must not exceed the maximum oper-
ating pressure per the serial nameplate.
6.13.1 Differential pressure regulator
adjustment
Refer to Figure 6-6. The differential pressure regulators
are adjusted by loosening the jam nut on the end of the
con
e shaped cover of the pressure regulator. When the
jam nut is loose, turn the adjusting screw clockwise to
increase or counterclockwise to decrease the setting.
1 psi above the full load rated pressure of the compres-
sor, the inlet regulator should allow
pressure to flow into
the unload chamber of the inlet valve. Cycle the control
system several times and recheck all pressure settings.
Figure 6-6: Pressure regulator
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