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PRE-START CHECKLIST 

 

 

Read the owner’s manual thoroughly. Make sure that you completely understand all of the safety warnings, 

system controls and instructions provided before attempting to operate this air compressor. Every effort has been 
made to provide you with the information needed to obtain many years of reliable and trouble-free service out of 
your new air compressor. It is your responsibility to operate the air compressor properly. To obtain the longest 
possible service life from your air compressor you must always keep the following instructions in mind. 

 
 

1.

 

ALWAYS OPERATE THE COMPRESSOR IN A LEVEL POSITION 
All splash-lubricated pumps have a dipper on the bottom of the connecting rod that must remain submerged in 
the oil bath. Operation at more than a 10 degree angle will cause the pump to seize and void the product 
warranty 

 

2.

 

OPERATE IN A CLEAN, DRY AND WELL VENTILATED AREA 
Allow at least 18” behind the belt guard for proper cooling of pump from flywheel blast. Do not operate in the rain 
or in areas of standing water. Never operate in an area where other gases, fumes or vapors are present which 
may become explosive when compressed. Do not operate compressor in an enclosed area.  

 

3.

 

CHECK OIL LEVEL DAILY AND CHANGE AT REGULAR INTERVALS 
Refer to the maintenance section of this owner’s manual for the correct type/weight of oil to use and how often 
the oil should be changed. Check oil levels daily. 

 

4.

 

INSPECT/CLEAN/CHANGE INTAKE ELEMENTS ON A REGULAR BASIS 
The ingestion of dirt into the pump and engine is the primary cause of premature wear. Pay special attention to 
the intake filters. Check intake filters daily. 

 

5.

 

USE LONGER PROPERLY SIZED AIR HOSE RATHER THAN EXTENSION CORDS 
If an extension cord must be used, please refer to the chart below for the proper gauge and maximum length that 
can be used. The use of inadequately sized air hose will also lead to frictional pressure drops that could affect the 
proper performance of your air tools.  

 

6.

 

DO NOT USE A GENERATOR AS THE POWER SOURCE 
Air compressors use inductive motors that require 3-5 times the full-load amp draw to properly start. Most 
generators will not provide the wattage needed to properly start this type of electric motor. 

 

7.

 

CHECK TENSION OF BOLTS, BELTS, AND HARDWARE ON A REGULAR BASIS  

      Operation of any equipment with loose bolts and/or fittings will lead to excessive vibration                    
      and the premature failure of the compressor system control components. 
 
8.

 

MAINTAIN RUBBER VIBRATION PADS 
Excessive vibration is a major cause of premature compressor failure. Always maintain the rubber vibration pads 
located beneath tank assembly. Operation without them will void your warranty. 

 

9.

 

DRAIN MOISTURE FROM AIR TANKS DAILY 
Water is a natural byproduct of compressed air. Drain air tank(s) after each use to combat internal tank corrosion. 
Keep drain valve(s) closed if storing compressor for any length of time. 

 

ELECTRIC EXTENSION CORD TABLE 

Minimum Wire Size

 

Extension 

Cord Length 

Motor

1/2 and 3/4 HP 

Motor 

1, 1-1/2, and 2 HP 

Up to 25 ft. 

14 Ga.

12 Ga. 

25 – 50 ft. 

12 Ga.

10 Ga. 

50 – 100 ft. 

10 Ga.

8 Ga. 

 
10.

 

DO NOT ALTER FACTORY RPM SETTINGS ON GAS-POWERED COMPRESSORS. Engine throttle arm is factory set 
and locked into position at RPMs that will provide maximum performance, fuel consumption and service life. 
Alterations to this setting will void your warranty. 

 
 

Summary of Contents for 4090HK17

Page 1: ...MODEL 4090HK17 4090RK17 SERIAL __________________ INSTRUCTION MANUAL 606 South Lake Street P O Box 346 Hustisford WI 53034 0346 920 349 3281 fax 920 349 3691 www rolair com...

Page 2: ...fuel line before transporting a gas powered air compressor If left open gas will seep past the needle seat in carburetor mix with the oil in the engine s crankcase and foul out the spark plug Replacem...

Page 3: ...save time and expense by including this reference information when requesting service or replacement parts Place Date of Purchase Volts Model HZ Serial HP With the tank gauge at 0 PSI and air line s d...

Page 4: ...ast This manual was compiled for the benefit of the operator Do not use or allow anyone else to use your air compressor until this manual is read and all safety operating instructions are understood B...

Page 5: ...imum pressure recommendations Never exceed the manufacturer s maximum allowable pressure ratings Do not use compressor to inflate small low pressure objects such as toys Risk of Electrocution or Elect...

Page 6: ...ssor Never point the air stream or tools at any point of your body other people or animals Always turn off the air compressor and drain tank pressure completely before attempting maintenance or attach...

Page 7: ...start and stop automatically within the settings of the pressure switch which are typically 105 130 PSI Do not attempt to stop the compressor by unplugging the power cord To stop simply move the lever...

Page 8: ...fe Do not alter the factory top RPM setting The engine idle speed is factory set and controlled by a black plastic Philips head screw on the carburetor A slight increase to the idle speed setting may...

Page 9: ...r Pay special attention to the intake filters Check intake filters daily 5 USE LONGER PROPERLY SIZED AIR HOSE RATHER THAN EXTENSION CORDS If an extension cord must be used please refer to the chart be...

Page 10: ...nce tripping of the motor overload due to an excessive amount of motor starts per hour CONSTANT SPEED OPERATION Constant speed or continuous running operation should be used during periods of heavy us...

Page 11: ...end using ROLAIR Premium Quality compressor oil MAINTENANCE SCHEDULE Recommendation Daily Weekly Monthly Quarterly Check Oil Level X Drain Moisture from Tank s X Inspect Air Filter s X Check for Unusu...

Page 12: ...unloading at felt muffler and cause gas engine to slow down to idle speed If pilot valve does not unload as tank pressure approaches 130 P S I G slowly turn top end setting 4 counterclockwise until pi...

Page 13: ...flywheel Tighten appropriate parts Loose belts Adjust belt tension Internal pump problem Take unit in for service Overheating compressor Poor ventilation Relocate compressor Improper pump rotation Co...

Page 14: ...ties of merchantability and fitness for purpose and of any other obligations and or liabilities on the part of Associate Engineering Corporation Associate Engineering Corporation neither assumes nor a...

Page 15: ......

Page 16: ...EL0250X012539 1 Brass Sleeve BRSL0250 2 38 Throttle Control Kit 192EGX160K1QX 1 Brass Ring BRRG0250 2 39 Gauge GA0250200GC 1 11 Pilot Unloader Valve 131B 1 42 Belt Tightener Mounting Kit SBT5HP ANGLE...

Page 17: ......

Page 18: ...H 2 Aftercooler 32901460CH 1 Crankcase 33101160CH 1 Sight Gauge 36500140CH 1 3 8 Breather Oil Fill Plug 36507050CH 1 Bolt 37300250CH 4 Bolt 37300990CH 6 Bolt 37301140CH 14 Bolt 37302530CH 2 Nut 374002...

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