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MAINTENANCE
(continued)
MAINTENANCE SCHEDULE
Recommendation Daily Weekly Monthly Quarterly
Check Oil Level X
Drain Moisture from Tank(s) X
Inspect Air Filter(s) X
Check for Unusual Noise or Vibration X
Inspect Belt Guard X
Check for Air or Oil Leaks X
Clean Exterior of Air Compressor X
Check Condition of Vibration Pads X
Tighten/Retorque Bolts X
Check Belt Tension X
Check Operation of Safety Valve X
Change Compressor Oil X
Clean/Change Air Filter X
Perform Pump Up Time Test X
Check Operation of System Controls X
Check Air Tanks for Dents/Leaks X
TORQUE CHART (INCH/LB)
Pump Type Direct Drive K12 K17 K18 K24 K28 K30
Head Bolts 96 243 243 243 243 347 347
Cylinder Bolts 120 182 182 182 182 330 330
Bearing-Carrier Bolts N/A 130 130 130 130 130 130
Connecting-Rod Bolts N/A 121.5 121.5 121.5 121.5 121.5 173.6
Flywheel N/A 243 382 382 382 477 477
Determine pump type using suffix of Model number (Example: 4090HK17 uses K17 pump)
PILOT VALVE ADJUSTMENT
RESETTING DIFFERENTIAL (2)
Make sure the top toggle lever is positioned as shown. (See Figure 3). Loosen
locknut (1) by turning counterclockwise several full turns. Gently turn differential setting (2)
clockwise only until the internal rod makes contact with the steel ball inside. After making
contact, turn differential (2) counterclockwise 1/4 turn. Secure position by tightening locknut
(1) and proceed to top end setting.
TOP-END SETTING (4)
Loosen locknut (3) by turning counterclockwise several full turns. (4) is the top end
setting. Turning (4) clockwise will increase the top end pressure setting. Turning
counterclockwise will decrease the top end pressure setting. Begin at a low setting by
turning counterclockwise one full turn. Proceed to fine tuning instructions.
FINE-TUNING INSTRUCTIONS
Start engine/motor and observe tank pressure gauge. As tank pressure approaches
100-130 P.S.I.G., the pilot valve should begin 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 pilot starts to unload
prematurely (at 100 P.S.I.G.), turn top end setting (4) clockwise in 1/4 turn increments, tap
down on the internal rod at toggle attachment and repeat until desired top end setting is
reached. If pilot valve begins to rifle (sputter), fine tune differential setting (2) 1/16 turn in
either direction until rifling stops. After fine tuning, secure setting by turning locknuts (1 & 3)
clockwise until tight. Hold setting (2 & 4) in place while turning locknuts to secure.
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