SECTION 6 ES-6 USER MANUAL
71
MINIMUM PRESSURE/CHECK VALVE MAINTENANCE
Refer to Figure 6-4. Minimum pressure/check valve
maintenance is minimal. The only parts which
normally require replacement are the o-ring seal
around the piston and the valve seat on the check
valve. To replace any of the two parts, follow the
procedure explained below.
1. Unscrew the minimum pressure valve from
the drive housing.
2. Remove all parts.
3. Clean and inspect all parts.
4. Remove the screw holding the check valve
seat. Replace valve seat. Reinstall securing
with Loctite® #222.
5. Install new o-ring. Before reinstallation, lubri-
cate with Parker Super "O" ring seal or an
equivalent grease.
6. Reinstall the whole valve assembly. Tighten
and secure.
T
HERMOSTAT ACTUATOR MAINTENANCE
Refer to Figure 6-5. The only part which would ever
need replacement is the thermostat valve actuator.
For replacement, follow the procedure explained
below.
1. To prevent spillage and loss of re-usable
fluid, place a contaminate-free fluid recepta-
cle beneath fluid drain valve and fluid filter.
2. Drain fluid by removing fluid drain cap at tee
located beneath compressor.
3. Unscrew and remove hollow hex plug.
4. Remove spring and piston.
5. By using long nosed pliers, pull the actuator
out.
WARNING
Before doing compressor maintenance, dis-
connect compressor from power source
and lock out power source. Isolate com-
pressor from line pressure by closing rec-
ommended discharge shut-off valve and
releasing all internal pressure from com-
pressor.
WARNING
Assure that line pressure gauge on com-
pressor indicates "ZERO" pressure before
any work is done. Failure to comply can
cause injury.
1.Valve
Spring
2. O-Ring (I) 3. Valve
Stem
4. Washer
4. Screw 5. Valve
Seat (I)
6. Check
Spring (I)
7. Cap
(I) Repair Kit P/N 250030-226
WARNING
Before doing compressor maintenance, dis-
connect compressor from power source
and lock out power source. Isolate com-
pressor from line pressure by closing rec-
ommended discharge shut-off valve and
releasing all internal pressure from com-
pressor.
Figure 6-4: Minimum Pressure/Check Valve
(P/N 604131)
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