®SULLAIR
®SULLAIR®
3700 Operator’s Manual and Parts List
33
3700 Operator’s Manual and Parts List
Section 6
MAINTENANCE
6.1 GENERAL
As you proceed in reading this section, it will be easy to 
see that the Maintenance Program for the air 
compressor is quite simple. The use of the service 
indicators provided for the fluid filter, air filter and fluid 
separator, will alert you when service maintenance is 
required. When the microprocessor display indicates 
service, maintenance for that specific item is required. 
See instructions for each item in Section 6.6, Filter 
Maintenance.
6.2 DAILY OPERATION
Prior to starting the compressor, it is necessary to check 
the fluid level in the sump. Should the level be low, 
simply add the necessary amount. If the addition of fluid 
becomes too frequent, a simple problem has developed 
which is causing this excessive loss. See the 
Troubleshooting Guide Section under EXCESSIVE 
COMPRESSOR FLUID CONSUMPTION for a probable 
cause and remedy. 
After a routine start has been made, observe the 
controller display and be sure it monitors the correct 
readings for their particular phase of operation. After the 
compressor has warmed up, it is recommended that a 
general check on the overall compressor be made to 
assure that the compressor is running properly. 
6.3 MAINTENANCE AFTER INITIAL 50 
HOURS OF OPERATION
After the initial 50 hours of operation, a few maintenance 
requirements are needed to clean the system of any 
foreign materials. Perform the following maintenance 
operations to prevent unnecessary problems.
1. Clean the return line strainer (refer to 6.4, for 
location).
2. Clean the return line orifice.
6.4 MAINTENANCE EVERY 2000 
HOURS
After 2000 hours of operation, it will be necessary to 
perform the following:
1. Clean the return line strainer (refer to8.10,  for 
location).
2. Replace the fluid filter element.
A WARNINGA WARNINGA WARNING
HIGH-PRESSURE HAZARD!
• DO NOT remove caps, plugs, and/or 
other components when compressor is 
running or pressurized. Stop 
compressor and relieve all internal 
pressure before doing so.
• Failure to comply could result in death 
or serious injury.
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