John Deere AC1-CG16H - Manual (Page 23)

Operator’s Manual 
Symptom Problem Solution
engine will not start. various engine problems. Refer to the engine manual
accompanying your unit.
noisy operation. Loose engine pulley or pump flywheel. Tighten pulley and or flywheel.
Lack of oil in the pump. Add correct amount of oil. Check
for bearing damage.
Carbon deposits on pistons or valves. Remove cylinder head and inspect.
Clean or replace.
Bearing, piston or connecting rod failure. STOP THE UNIT! Contact John Deere
customer service.
Pressure drop in air tank or Air leaks at connections. Allow the unit to build pressure to the
rapid pressure loss when the maximum allowed. Turn off and brush
unit is shut off. a soapy water solution onto all
connections. Check connections for
air bubbles. Tighten the connections
where leaks are present.
Air leak in air tank. Air tank must be replaced. Do not
attempt to repair air tank!
Defective Pilot valve. Clean or replace.
Insufficient pressure at air Pressure Regulator not turned to Adjust Pressure Regulator to proper
tool or accessory. high enough pressure or defective. setting or replace.
Restricted air intake. Clean or replace Air Intake Filter.
Air leaks or restrictions. Check for leaks and repair.
Hose or hose connections are too Replace with larger hose or
small or long. connectors.
Slipping belt. Tighten or replace.
The unit is not large enough for air Check the accessory air requirement.
requirement. If it is higher than the CFM or pressure
supply to the air compressor, use a
larger unit.
Restriction in Pilot valve. Clean or replace.
Troubleshooting