76347-385 • 06 -15
4.25
Problem Probable Cause Corrective Action
Chipper will not feed properly Dull chipper knives Turn, sharpen, or replace knives
Loose belts Check for proper belt tension
Knives ground at incorrect angle Grind knives at 31°
Obstruction in infeed spout Raise the yoke and insert yoke lock pin. Turn OFF the engine and
lockout the machine. Wait for the chipper drum to come to a complete
stop. Carefully remove the obstructing material from the infeed.
Chipper bearing running to hot
(210° F maximum)
Not enough or too much lubrication Lubricate according to manufacturers recommendations
Drum RPM too high Do not exceed 2,484 RPM
Discharge spout plugged Obstruction in discharge spout Lower discharge or if equipped open clean out door and clean out
Chipper drum RPM too low Always run the chipper at full throttle when chipping
Chipper drum wobbles Bushings are loose Torque to 80 ft-lb
Bearing cap is loose Torque to 80 ft-lb
Chipper bearings are worn or damaged Replace bearings
Knife pockets are plugged with material Unplug pockets
Chipper drum will not turn Obstruction in chipper housing Turn OFF the engine and lockout the machine. Carefully remove the
obstructing material from the chipper housing.
Drum bearings have seized up Check chipper bearings and lubricate or replace
Contaminates in chipper bearing Loss of grease seal between Ler ring
and shaft
Lubricate drum bearing Ler ring
General Maintenance • Troubleshooting Chart
Table 4.7 • Chipper Troubleshooting Guide
Table 4.8 • Pressure Guide
Model Main Relief
Feed Wheel RPM
Top
M12RX 2,000 psi 21-25
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